release: bump to version 0.13.0

PaletteService exposes window.localStorage as this.localStorageService. This is confusing since we also have the LocalStorageService class used to save piskels in local storage.

.codeclimate.yml

@@ -0,0 +1,25 @@
+engines:
+  csslint:
+    enabled: true
+  duplication:
+    enabled: true
+    config:
+      languages:
+        - javascript
+  eslint:
+    enabled: true
+    checks:
+      wrap-iife:
+        enabled: false
+  fixme:
+    enabled: true
+ratings:
+  paths:
+    - "**.css"
+    - "**.js"
+exclude_paths:
+  - .github/
+  - bin/
+  - misc/
+  - src/js/lib/
+  - test/

.eslintignore

@@ -0,0 +1,2 @@
+# Exclude libs.
+**/lib/**/*.js

.gitignore

@@ -1,4 +1,4 @@
-# mac artefacts
+# mac artifacts
 *.DS_Store
 
 # nodejs local installs
@@ -15,10 +15,12 @@ cache
 # netbeans project folder
 nbproject
 
+# vscode workspace folder
+.vscode
+
 # git stackdumps
 *.stackdump
 
-
 # diffs
 diff.txt
 

.jscsrc

@@ -1,75 +0,0 @@
-{
-    "requireCurlyBraces": [
-        "if",
-        "else",
-        "for",
-        "while",
-        "do",
-        "try",
-        "catch"
-    ],
-    "requireOperatorBeforeLineBreak": true,
-    "requireCamelCaseOrUpperCaseIdentifiers": true,
-    "maximumLineLength": {
-      "value": 80,
-      "allExcept": ["comments", "regex"]
-    },
-    "validateIndentation": 2,
-    "validateQuoteMarks": "'",
-
-    "disallowMultipleLineStrings": true,
-    "disallowMixedSpacesAndTabs": true,
-    "disallowTrailingWhitespace": true,
-    "disallowSpaceAfterPrefixUnaryOperators": true,
-    "disallowMultipleVarDecl": true,
-    "disallowKeywordsOnNewLine": ["else"],
-
-    "requireSpaceAfterKeywords": [
-      "if",
-      "else",
-      "for",
-      "while",
-      "do",
-      "switch",
-      "return",
-      "try",
-      "catch"
-    ],
-    "requireSpaceBeforeBinaryOperators": [
-        "=", "+=", "-=", "*=", "/=", "%=", "<<=", ">>=", ">>>=",
-        "&=", "|=", "^=", "+=",
-
-        "+", "-", "*", "/", "%", "<<", ">>", ">>>", "&",
-        "|", "^", "&&", "||", "===", "==", ">=",
-        "<=", "<", ">", "!=", "!=="
-    ],
-    "requireSpaceAfterBinaryOperators": true,
-    "requireSpacesInConditionalExpression": true,
-    "requireSpaceBeforeBlockStatements": true,
-    "requireSpacesInForStatement": true,
-    "requireLineFeedAtFileEnd": true,
-    "requireSpacesInFunctionExpression": {
-        "beforeOpeningCurlyBrace": true
-    },
-    "disallowSpacesInAnonymousFunctionExpression": {
-        "beforeOpeningRoundBrace": false
-    },
-    "disallowSpacesInsideObjectBrackets": "all",
-    "disallowSpacesInsideArrayBrackets": "all",
-    "disallowSpacesInsideParentheses": true,
-
-    "disallowMultipleLineBreaks": true,
-    "disallowNewlineBeforeBlockStatements": true,
-    "disallowKeywords": ["with"],
-    "disallowSpacesInFunctionExpression": null,
-    "disallowSpacesInFunctionDeclaration": null,
-    "disallowSpacesInCallExpression": true,
-    "disallowSpaceAfterObjectKeys": false,
-    "requireSpaceBeforeObjectValues": true,
-    "requireCapitalizedConstructors": true,
-    "requireDotNotation": true,
-    "requireSemicolons": true,
-    "validateParameterSeparator": ", ",
-
-    "jsDoc": null
-}

.travis.yml

@@ -1,14 +1,9 @@
 language: node_js
 node_js:
-  - "4.1"
+  - "7.4.0"
 before_install:
   - npm update -g npm
   - npm install -g grunt-cli
-  - git clone git://github.com/n1k0/casperjs.git ~/casperjs
-  - cd ~/casperjs
-  - git checkout tags/1.1.3
-  - export PATH=$PATH:`pwd`/bin
-  - cd -
 before_script:
   - phantomjs --version
   - casperjs --version

Gruntfile.js

@@ -12,6 +12,7 @@ module.exports = function(grunt) {
   // create a version based on the build timestamp
   var dateFormat = require('dateformat');
   var version = '-' + dateFormat(new Date(), "yyyy-mm-dd-hh-MM");
+  var releaseVersion = require('./package.json').version;
 
   /**
    * Helper to prefix all strings in provided array with the provided path
@@ -82,33 +83,12 @@ module.exports = function(grunt) {
       css : ['src/css/**/*.css']
     },
 
-    jscs : {
-      options : {
-        "config": ".jscsrc",
-        "maximumLineLength": 120,
-        "requireCamelCaseOrUpperCaseIdentifiers": "ignoreProperties",
-        "validateQuoteMarks": { "mark": "'", "escape": true },
-        "disallowMultipleVarDecl": "exceptUndefined",
-        "disallowSpacesInAnonymousFunctionExpression": null
-      },
-      js : [ 'src/js/**/*.js' , '!src/js/**/lib/**/*.js' ]
-    },
-
-    jshint: {
-      options: {
-        undef : true,
-        latedef : true,
-        browser : true,
-        trailing : true,
-        curly : true,
-        globals : {'$':true, 'jQuery' : true, 'pskl':true, 'Events':true, 'Constants':true, 'console' : true, 'module':true, 'require':true, 'Q':true, 'Promise': true}
-      },
+    eslint: {
       files: [
         // Includes
-        'Gruntfile.js',
-        'package.json',
         'src/js/**/*.js',
-        // Excludes
+        // Exludes
+        // TODO: remove this (for now we still get warnings from the lib folder)
         '!src/js/**/lib/**/*.js'
       ]
     },
@@ -194,7 +174,8 @@ module.exports = function(grunt) {
         dest: 'dest/tmp/index.html',
         options : {
           globals : {
-            'version' : version
+            'version' : version,
+            'releaseVersion' : releaseVersion
           }
         }
       }
@@ -236,20 +217,6 @@ module.exports = function(grunt) {
           src: ['dest/tmp/css/piskel-style-packaged' + version + '.css'],
           dest: 'dest/prod/css/piskel-style-packaged' + version + '.css'
         }]
-      },
-      // remove the fake header from the desktop build
-      desktop: {
-        options: {
-          patterns: [{
-              match: /<!--standalone-start-->(?:.|[\r\n])*<!--standalone-end-->/,
-              replacement: "",
-              description : "Remove everything between standalone-start & standalone-end"
-            }
-          ]
-        },
-        files: [
-          {src: ['dest/prod/index.html'], dest: 'dest/prod/index.html'}
-        ]
       }
     },
 
@@ -319,7 +286,8 @@ module.exports = function(grunt) {
           build_dir: './dest/desktop/', // destination folder of releases.
           win: true,
           linux32: true,
-          linux64: true
+          linux64: true,
+          flavor: "normal",
         },
         src: ['./dest/prod/**/*', "./package.json", "!./dest/desktop/"]
       },
@@ -328,7 +296,18 @@ module.exports = function(grunt) {
           downloadUrl: 'https://dl.nwjs.io/',
           osx64: true,
           version : "0.19.4",
-          build_dir: './dest/desktop/'
+          build_dir: './dest/desktop/',
+          flavor: "normal",
+        },
+        src: ['./dest/prod/**/*', "./package.json", "!./dest/desktop/"]
+      },
+      macos_old : {
+        options: {
+          downloadUrl: 'https://dl.nwjs.io/',
+          osx64: true,
+          version : "0.12.3",
+          build_dir: './dest/desktop/old',
+          flavor: "normal",
         },
         src: ['./dest/prod/**/*', "./package.json", "!./dest/desktop/"]
       }
@@ -337,11 +316,13 @@ module.exports = function(grunt) {
 
   // TEST TASKS
   // Run linting
-  grunt.registerTask('lint', ['jscs:js', 'leadingIndent:css', 'jshint']);
+  grunt.registerTask('lint', ['eslint', 'leadingIndent:css']);
   // Run unit-tests
   grunt.registerTask('unit-test', ['karma']);
   // Run integration tests
   grunt.registerTask('integration-test', ['build-dev', 'connect:test', 'casperjs:integration']);
+  // Run drawing tests
+  grunt.registerTask('drawing-test', ['build-dev', 'connect:test', 'casperjs:drawing']);
   // Run linting, unit tests, drawing tests and integration tests
   grunt.registerTask('test', ['lint', 'unit-test', 'build-dev', 'connect:test', 'casperjs:drawing', 'casperjs:integration']);
 
@@ -356,8 +337,9 @@ module.exports = function(grunt) {
   grunt.registerTask('merge-statics', ['concat:js', 'concat:css', 'uglify']);
   grunt.registerTask('build',  ['clean:prod', 'sprite', 'merge-statics', 'build-index.html', 'replace:mainPartial', 'replace:css', 'copy:prod']);
   grunt.registerTask('build-dev',  ['clean:dev', 'sprite', 'build-index.html', 'copy:dev']);
-  grunt.registerTask('desktop', ['clean:desktop', 'default', 'replace:desktop', 'nwjs:windows']);
-  grunt.registerTask('desktop-mac', ['clean:desktop', 'default', 'replace:desktop', 'nwjs:macos']);
+  grunt.registerTask('desktop', ['clean:desktop', 'default', 'nwjs:windows']);
+  grunt.registerTask('desktop-mac', ['clean:desktop', 'default', 'nwjs:macos']);
+  grunt.registerTask('desktop-mac-old', ['clean:desktop', 'default', 'replace:desktop', 'nwjs:macos_old']);
 
   // SERVER TASKS
   // Start webserver and watch for changes

README.md

@@ -1,50 +1,21 @@
 Piskel
 ======
 
-[![Travis Status](https://api.travis-ci.org/juliandescottes/piskel.png?branch=master)](https://travis-ci.org/juliandescottes/piskel) [![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](http://gruntjs.com/)
+[![Travis Status](https://api.travis-ci.org/piskelapp/piskel.png?branch=master)](https://travis-ci.org/piskelapp/piskel) [![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](http://gruntjs.com/)
 
-A simple web-based tool for Spriting and Pixel art.
+Piskel is an easy-to-use sprite editor. It can be used to create game sprites, animations, pixel-art...
+It is the editor used in **[piskelapp.com](http://piskelapp.com)**.
 
-![Piskel editor screenshot](https://screenletstore.appspot.com/img/8f03e768-ac59-11e3-b2a1-7f5a1b97c420.jpeg "Piskel editor screenshot")
+<img
+  src="https://screenletstore.appspot.com/img/95aaa0f0-37a4-11e7-a652-7b8128ce3e3b.png"
+  title="Piskel editor screenshot"
+  width="500">
 
-You can try the standalone editor at **http://juliandescottes.github.io/piskel** or see it integrated in **http://piskelapp.com**.
+## About Piskel
 
-Piskel is mainly developped by :
+### Built with
 
-* **[@juliandescottes](https://github.com/juliandescottes)**
-* **[@grosbouddha](https://github.com/grosbouddha)**
-
-## What's the point ?
-
-You can use Piskel to do two things :
-* **spriting** : create retro-style sprites for games
-
-![Megaman spritesheet](http://piskel-imgstore-a.appspot.com/img/c8081287-ac58-11e3-bd8c-b3c4036c0eee.png "Megaman spritesheet")
-
-* **pixelart** : create crazy/pretty pixelart animations for fun !
-
-![Rabbit jumping](http://piskel-imgstore-a.appspot.com/img/947f2dab-ac58-11e3-949a-b3c4036c0eee.gif "Rabit jumping")
-
-Integrated in **[piskelapp.com](http://piskelapp.com)**, you can share everything you work on with others as easily as you share a link.
-
-## Requirements
-
-Piskel supports the following browsers :
-* **Chrome** (latest)
-* **Firefox** (latest)
-* **Internet Explorer** 11+
-
-... and a fairly recent computer.
-
-We don't plan/want/could be forced into supporting older IEs. For Opera and Safari, we've never tested them but the gap shouldn't be huge.
-
-## Offline version
-
-Offline builds are available. More details in the [dedicated wiki page](https://github.com/juliandescottes/piskel/wiki/Desktop-applications).
-
-## Built with
-
-The Piskel editor is purely built in **JavaScript, HTML and CSS**. It uses Canvas extensively for displaying all them pretty sprites.
+The Piskel editor is purely built in **JavaScript, HTML and CSS**.
 
 We also use the following **libraries** :
 * [spectrum](https://github.com/bgrins/spectrum) : awesome standalone colorpicker
@@ -59,17 +30,32 @@ As well as some **icons** from the [Noun Project](http://thenounproject.com/) :
 * Folder by Simple Icons from The Noun Project
 * (and probably one or two others)
 
+### Browser Support
+
+Piskel supports the following browsers:
+* **Chrome** (latest)
+* **Firefox** (latest)
+* **Edge** (latest)
+* **Internet Explorer** 11
+
+### Mobile/Tablets
+
+There is no support for mobile.
+
+### Offline builds
+
+Offline builds are available. More details in the [dedicated wiki page](https://github.com/piskelapp/piskel/wiki/Desktop-applications).
 
 ## Contributing ?
 
 Help is always welcome !
 
-* **Issues** : Found a problem when using the application, want to request a feature, [open an issue](https://github.com/juliandescottes/piskel/issues).
-* **Participate** : Have a look at the [wiki](https://github.com/juliandescottes/piskel/wiki) to set up the development environment
+* **Issues** : Found a problem when using the application, want to request a feature, [open an issue](https://github.com/piskelapp/piskel/issues).
+* **Development** : Have a look at the [wiki](https://github.com/piskelapp/piskel/wiki) to set up the development environment
 
 ## License
 
-Copyright 2016 Julian Descottes
+Copyright 2017 Julian Descottes
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -83,7 +69,3 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 
-## Mobile/Tablets
-
-There is no support for mobile for now.
-

bin/copy-to-piskel-website.js

@@ -6,6 +6,8 @@ const fse = require('fs-extra');
 const PISKEL_PATH = path.resolve(__dirname, '..');
 const PISKELAPP_PATH = path.resolve(__dirname, '../../piskel-website');
 
+var pjson = require('../package.json');
+
 // Callbacks sorted by call sequence.
 function onCopy(err) {
   if (err) {
@@ -15,8 +17,17 @@ function onCopy(err) {
 
   console.log('Copied static files to piskel-website...');
   let previousPartialPath = path.resolve(PISKELAPP_PATH, 'templates/editor/main-partial.html');
+  fs.access(previousPartialPath, fs.constants.F_OK, function (err) {
+    if (err) {
+      // File does not exit, call next step directly.
+      console.error('Previous main partial doesn\'t exist yet.');
+      onDeletePreviousPartial();
+    } else {
+      // File exists, try to delete it before moving on.
       fs.unlink(previousPartialPath, onDeletePreviousPartial);
     }
+  })
+}
 
 function onDeletePreviousPartial(err) {
   if (err) {
@@ -52,6 +63,17 @@ function onDeleteTempPartial(err) {
   }
 
   console.log('Temporary main partial deleted...');
+
+  fs.writeFile(path.resolve(PISKELAPP_PATH, "static/editor/VERSION"), pjson.version, onVersionFileCreated);
+}
+
+function onVersionFileCreated(err) {
+  if (err) {
+    console.error('Failed to create temporary main partial...');
+    return console.error(err);
+  }
+
+  console.log('Version file created...');
   console.log('Finished!');
 }
 

misc/icons/source/common-backup.svg

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   width="90"
+   height="90"
+   viewBox="0 0 89.999997 90"
+   enable-background="new 0 0 89.231 100"
+   xml:space="preserve"
+   inkscape:version="0.92.1 r15371"
+   sodipodi:docname="common-backup.svg"
+   inkscape:export-filename="C:\Development\git\piskel\misc\icons\source\tool-rotate.png"
+   inkscape:export-xdpi="45"
+   inkscape:export-ydpi="45"><metadata
+     id="metadata15"><rdf:RDF><cc:Work
+         rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
+     id="defs13" /><sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="1148"
+     id="namedview11"
+     showgrid="false"
+     inkscape:zoom="7.75"
+     inkscape:cx="13.031976"
+     inkscape:cy="43.272537"
+     inkscape:window-x="-8"
+     inkscape:window-y="-8"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="Layer_1" /><g
+     id="g3760"
+     transform="matrix(0,-0.97677741,0.97203982,0,-2.1261998,91.355253)"
+     style="fill:#ff00ff;fill-opacity:1"><path
+       style="fill:#ff00ff;fill-opacity:1"
+       inkscape:connector-curvature="0"
+       id="path3"
+       d="m 29.229405,55.37008 c -0.387431,-1.333059 -0.642506,-2.72161 -0.738881,-4.152895 h -8.675106 c 0.115651,2.460738 0.552554,4.838559 1.260594,7.099021 z" /><path
+       style="fill:#ff00ff;fill-opacity:1"
+       inkscape:connector-curvature="0"
+       id="path5"
+       d="m 29.023802,70.783821 5.579515,-6.601516 c -1.862622,-1.780814 -3.387929,-3.907969 -4.44999,-6.287065 l -8.152106,2.946124 c 1.604978,3.800815 4.017584,7.185766 7.022581,9.942457 z" /><path
+       style="fill:#ff00ff;fill-opacity:1"
+       inkscape:connector-curvature="0"
+       id="path7"
+       d="m 47.110967,69.703978 c -3.887799,-0.260871 -7.469766,-1.6322 -10.437498,-3.790608 l -5.577588,6.598963 c 4.487901,3.403448 10.011517,5.524225 16.015086,5.803594 z" /><path
+       style="fill:#ff00ff;fill-opacity:1;stroke:none"
+       inkscape:connector-curvature="0"
+       id="path9"
+       d="M 48.464084,21.400659 V 14.532532 L 28.981398,25.698341 48.464084,36.86415 v -6.867489 c 11.042093,0 20.024317,8.91683 20.024317,19.877897 0,10.509484 -8.258763,19.134189 -18.671845,19.828145 v 8.611948 c 15.190751,-0.703524 27.330245,-13.189635 27.330245,-28.440093 0,-15.700763 -12.86681,-28.473899 -28.682717,-28.473899 z" /></g><g
+     id="g4513"
+     transform="translate(0,-2)"><rect
+       y="32.516129"
+       x="42"
+       height="15.612903"
+       width="7.9999986"
+       id="rect4494"
+       style="fill:#ff00f7;fill-opacity:1;stroke:#ffffed;stroke-width:0;stroke-linecap:butt;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:6.04534006;stroke-opacity:1" /><rect
+       transform="rotate(120)"
+       y="-76.050484"
+       x="12.680965"
+       height="15.612903"
+       width="7.9999986"
+       id="rect4494-7"
+       style="fill:#ff00f7;fill-opacity:1;stroke:#ffffed;stroke-width:0;stroke-linecap:butt;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:6.04534006;stroke-opacity:1" /></g></svg>

package.json

@@ -1,16 +1,16 @@
 {
   "name": "piskel",
-  "version": "0.10.0",
+  "version": "0.13.0",
   "description": "Pixel art editor",
   "author": "Julian Descottes <julian.descottes@gmail.com>",
   "contributors": [
     "Vincent Renaudin"
   ],
-  "homepage": "http://github.com/juliandescottes/piskel",
+  "homepage": "http://github.com/piskelapp/piskel",
   "license": "Apache-2.0",
   "repository": {
     "type": "git",
-    "url": "http://github.com/juliandescottes/piskel.git"
+    "url": "http://github.com/piskelapp/piskel.git"
   },
   "files": [
     "dest/prod",
@@ -24,20 +24,22 @@
     "test": "grunt test",
     "start": "nodewebkit",
     "preversion": "grunt test build",
-    "postversion": "git push && git push --tags && npm publish"
+    "postversion": "git push && git push --tags && npm publish",
+    "release": "grunt && node ./bin/copy-to-piskel-website"
   },
   "devDependencies": {
     "dateformat": "2.0.0",
-    "fs-extra": "1.0.0",
-    "grunt": "^0.4.5",
+    "fs-extra": "3.0.1",
+    "grunt": "0.4.5",
     "grunt-casperjs": "^2.2.1",
-    "grunt-contrib-clean": "1.0.0",
+    "grunt-contrib-clean": "1.1.0",
     "grunt-contrib-concat": "1.0.1",
     "grunt-contrib-connect": "1.0.2",
     "grunt-contrib-copy": "1.0.0",
     "grunt-contrib-jshint": "1.1.0",
-    "grunt-contrib-uglify": "1.0.1",
+    "grunt-contrib-uglify": "2.3.0",
     "grunt-contrib-watch": "1.0.0",
+    "grunt-eslint": "^19.0.0",
     "grunt-include-replace": "4.0.1",
     "grunt-jscs": "2.8.0",
     "grunt-karma": "1.0.0",
@@ -45,12 +47,11 @@
     "grunt-nw-builder": "3.1.0",
     "grunt-open": "0.2.3",
     "grunt-replace": "1.0.1",
-    "grunt-spritesmith": "6.3.0",
-    "jasmine-core": "2.1.0",
-    "karma": "1.3.0",
-    "karma-chrome-launcher": "1.0.1",
-    "karma-jasmine": "1.0.2",
-    "karma-phantomjs-launcher": "0.2.3",
+    "grunt-spritesmith": "6.4.0",
+    "jasmine-core": "2.6.1",
+    "karma": "1.7.0",
+    "karma-jasmine": "1.1.0",
+    "karma-phantomjs-launcher": "1.0.4",
     "load-grunt-tasks": "3.5.0",
     "phantomjs": "2.1.7",
     "phantomjs-polyfill-object-assign": "0.0.2",
@@ -62,6 +63,6 @@
     "icon": "dest/prod/logo.png",
     "toolbar": false,
     "width": 1000,
-    "height": 500
+    "height": 700
   }
 }

src/css/dialogs-browse-backups.css

@@ -0,0 +1,152 @@
+#dialog-container.browse-backups {
+  width: 700px;
+  height: 500px;
+  top : 50%;
+  left : 50%;
+  position : absolute;
+  margin-left: -350px;
+}
+
+.backups-step-container {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+}
+
+.backups-step-content {
+  width: 100%;
+  height: 10px;
+  flex-grow: 1;
+  background: #444;
+
+  padding: 20px;
+  overflow: auto;
+  box-sizing: border-box;
+}
+
+.backups-step-actions {
+  flex-grow: 0;
+  flex-shrink: 1;
+  height: 60px;
+  display: flex;
+  align-items: center;
+  padding: 0 20px;
+}
+
+.show #dialog-container.browse-backups {
+  margin-top: -250px;
+}
+
+.browse-backups .browse-backups-disclaimer {
+  display: flex;
+  margin-bottom: 20px;
+  align-items: center;
+}
+
+.browse-backups .browse-backups-disclaimer-content {
+  padding: 0 20px;
+  font-size: 13px;
+}
+
+.browse-backups .browse-backups-disclaimer .backups-icon {
+  border: 1px solid gold;
+  flex-shrink: 0;
+  width: 90px;
+  height: 90px;
+}
+
+.browse-backups .centered-message {
+  position: absolute;
+  left: 50%;
+  width: 200px;
+  margin-top: 100px;
+  margin-left: -130px;
+  padding: 30px;
+
+  font-size: 16px;
+  text-align: center;
+  border: 1px solid;
+}
+
+.browse-backups .session-list-empty,
+.browse-backups .snapshot-list-empty {
+  color: #bbb;
+}
+
+.browse-backups .session-list-error,
+.browse-backups .snapshot-list-error {
+  color: white;
+}
+
+.browse-backups .session-item {
+  /* Transition duration should be kept in sync with SelectSession.DELETE_TRANSITION_DURATION */
+  transition: all 500ms;
+}
+
+/* Hide and slide up next sessions when deleting an item */
+.browse-backups .session-item.deleting {
+  opacity: 0;
+  margin-bottom: -60px;
+}
+
+.browse-backups .session-item,
+.browse-backups .snapshot-item {
+  display: flex;
+  align-items: center;
+
+  width: 100%;
+  height: 80px;
+
+  margin-bottom: 10px;
+  padding: 0 20px;
+
+  border: 1px solid #666;
+  box-sizing: border-box;
+}
+
+.browse-backups .snapshot-preview {
+  flex-grow: 0;
+  flex-shrink: 1;
+  /* Keep synced with SessionDetails.PREVIEW_SIZE */
+  height: 60px;
+  width: 60px;
+  margin-right: 20px;
+}
+
+.browse-backups .session-details,
+.browse-backups .snapshot-details {
+  flex-grow: 1;
+  flex-shrink: 0;
+  display: flex;
+  flex-direction: column;
+}
+
+.browse-backups .session-details-title,
+.browse-backups .snapshot-details-title {
+  font-size: 13px;
+}
+
+.browse-backups .session-details-info,
+.browse-backups .snapshot-details-info {
+  font-size: 11px;
+  color: #bbb;
+  line-height: 1.5em;
+}
+
+.browse-backups .session-actions,
+.browse-backups .snapshot-actions {
+  flex-grow: 0;
+  flex-shrink: 1;
+  display: flex;
+}
+
+.browse-backups .session-actions button,
+.browse-backups .snapshot-actions button {
+  margin-left: 10px;
+}
+
+.browse-backups .session-item:last-child,
+.browse-backups .snapshot-item:last-child {
+  margin-bottom: 0;
+}

src/css/dialogs-browse-local.css

@@ -3,6 +3,19 @@
 /* Browse local piskels panel                                                                   */
 /************************************************************************************************/
 
+#dialog-container.browse-local {
+  width: 700px;
+  height: 500px;
+  top : 50%;
+  left : 50%;
+  position : absolute;
+  margin-left: -350px;
+}
+
+.show #dialog-container.browse-local {
+  margin-top: -250px;
+}
+
 .local-piskel-list {
   width: 100%;
 }

src/css/dialogs-import-image.css

@@ -1,101 +0,0 @@
-/************************************************************************************************/
-/* Import dialog                                                                                 */
-/************************************************************************************************/
-
-#dialog-container.import-image {
-  width: 550px;
-  height: 360px;
-  top : 50%;
-  left : 50%;
-  position : absolute;
-  margin-left: -250px;
-}
-
-.show #dialog-container.import-image {
-  margin-top: -150px;
-}
-
-.import-subsection {
-  margin-left: 25px;
-}
-
-.import-section:not(.import-subsection) > .dialog-section-title {
-  width: 50px;
-}
-
-.import-section-preview-title {
-  position: absolute;
-  margin-left: 50%;
-  margin-top: -28px;
-}
-
-.import-section-preview {
-  position: absolute;
-  display: inline-block;
-  border: 1px dashed #999;
-  border-radius: 3px;
-  margin-left: 50%;
-}
-
-.import-section-preview img {
-  max-width: 220px;
-  max-height: 220px;
-  display: block;
-}
-
-.import-section-preview.no-border {
-  border-color: transparent;
-}
-
-.import-section-preview canvas {
-  position: absolute;
-  left: 0;
-  top: 0;
-}
-
-.dialog-section-title {
-  display : inline-block;
-  width: 80px;
-}
-
-.dialog-section-radio {
-  margin-top: 15px;
-  vertical-align: sub;
-}
-
-.import-size-field:nth-of-type(2) {
-  margin-left: 5px;
-}
-
-.import-image-file-name {
-  display: inline-block;
-  overflow: hidden;
-
-  width: 200px;
-  vertical-align: middle;
-
-  word-break : break-all;
-  white-space: nowrap;
-  text-overflow: ellipsis;
-
-  font-style: italic;
-  font-weight: normal;
-  text-shadow: none;
-  color: var(--highlight-color);
-}
-
-[name=smooth-resize-checkbox] {
-  margin : 0 8px;
-}
-
-.dialog-import-body {
-  padding: 10px 20px;
-  font-size:1.3em
-}
-
-.import-button {
-  font-size: 1em;
-  height: 28px;
-  padding: 0px 10px;
-  margin-top: 15px;
-}

src/css/dialogs-import.css

@@ -0,0 +1,288 @@
+#dialog-container.import {
+  width: 500px;
+  height: 350px;
+  top : 50%;
+  left : 50%;
+  position : absolute;
+  margin-left: -250px;
+  margin-top: -175px;
+}
+
+.import .dialog-content {
+  font-size: 1.3em;
+}
+
+.import-step-container {
+  display: flex;
+  width: 100%;
+  height: 100%;
+  box-sizing: border-box;
+  box-shadow: 0 0 2px 0 rgba(0, 0, 0, 0.5);
+  background: #444;
+}
+
+.import-step-content {
+  padding: 10px;
+}
+
+.import-step-buttons {
+  position: absolute;
+  bottom: 10px;
+  right: 10px;
+  text-align: right;
+}
+
+.import-first-step .import-back-button {
+  display: none;
+}
+
+/**
+ * IMAGE IMPORT STEP
+ */
+
+.import-image-container {
+  padding: 10px;
+}
+
+.import-image-loading {
+  opacity: 0.3;
+  pointer-events: none;
+}
+
+.import-image-loading::after {
+  content: 'loading image';
+
+  position: absolute;
+  width: 100%;
+  top: 0;
+  left: 0;
+  margin-top: 110px;
+
+  text-align: center;
+  font-size: 3em;
+  color: white;
+  text-shadow: 0 0 60px black;
+}
+
+.import-subsection {
+  margin-left: 25px;
+}
+
+.import-section:not(.import-subsection) > .dialog-section-title {
+  width: 50px;
+}
+
+.import-section-preview-title {
+  position: absolute;
+  margin-left: 50%;
+  margin-top: -28px;
+}
+
+.import-section-preview {
+  position: absolute;
+  display: inline-block;
+  border: 1px dashed #999;
+  border-radius: 3px;
+  margin-left: 50%;
+  top: 10px;
+
+  width: 220px;
+  height: 220px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.import-section-preview img {
+  max-width: 100%;
+  max-height: 100%;
+  display: block;
+}
+
+.import-section-preview canvas {
+  position: absolute;
+}
+
+.dialog-section-title {
+  display : inline-block;
+  width: 80px;
+}
+
+.dialog-section-radio {
+  margin-top: 15px;
+  vertical-align: sub;
+}
+
+.import-size-field:nth-of-type(2) {
+  margin-left: 5px;
+}
+
+.import-image-file-name {
+  display: inline-block;
+  overflow: hidden;
+
+  width: 200px;
+  vertical-align: middle;
+
+  word-break : break-all;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+
+  font-style: italic;
+  font-weight: normal;
+  text-shadow: none;
+  color: var(--highlight-color);
+}
+
+[name=smooth-resize-checkbox] {
+  margin : 0 8px;
+}
+
+.dialog-import-body {
+  padding: 10px 20px;
+  font-size:1.3em
+}
+
+/**
+ * SELECT MODE
+ */
+
+.import-info {
+  display: flex;
+  flex-direction: column;
+
+  height: 100%;
+  max-width: 178px;
+  box-sizing: border-box;
+
+  padding: 10px;
+  border-right: 3px solid gold;
+}
+
+.import-preview canvas {
+  max-width: 100%;
+  max-height: 100%;
+}
+
+.import-meta {
+  margin-top: 10px;
+  box-sizing: border-box;
+
+  /*center meta information horizontally*/
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+}
+
+.import-meta > div {
+  height: 22px;
+  display: flex;
+  margin-bottom: 5px;
+}
+
+.import-meta-value,
+.import-meta-label {
+  padding: 2px 4px;
+}
+
+.import-meta-label {
+  border-radius: 2px 0 0 2px;
+  color: var(--highlight-color);
+}
+
+.import-meta-value {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.import-missing {
+  text-align: center;
+  line-height: 70px;
+  font-style: italic;
+  color: #aaa;
+}
+
+.import-mode-title {
+  margin-bottom: 10px
+}
+
+.import-mode-section {
+  display: flex;
+  border: 3px solid #666;
+  border-radius: 3px;
+  padding: 10px;
+  margin-bottom: 10px;
+  align-items: center;
+}
+
+.import-mode-section .button {
+  width: 75px;
+  height: 30px;
+  font-size: 14px;
+  margin-left: 10px;
+
+  flex-grow: 0;
+  flex-shrink: 0;
+}
+
+.import-mode-section-description {
+  flex-grow: 1;
+}
+
+.import-resize-option,
+.insert-mode-option {
+  display: flex;
+  align-items: center;
+  margin: 5px 0;
+}
+
+.import-resize-option :checked + span,
+.insert-mode-option :checked + span {
+  color: var(--highlight-color);
+}
+
+.import-resize-option input,
+.insert-mode-option input {
+  margin: 5px;
+}
+
+/**
+ * ADJUST SIZE
+ */
+.import-resize-anchor-info {
+  margin-bottom: 10px;
+}
+
+.import-resize-section {
+  margin-bottom: 10px;
+}
+
+.import-resize-anchor {
+  margin-top: 20px;
+}
+
+.import-resize-option :checked + span {
+  color: var(--highlight-color);
+}
+
+.import-resize-warning {
+  color: var(--highlight-color);
+}
+
+/**
+ * INSERT LOCATION
+ */
+
+.insert-mode-container {
+  margin-top: 20px;
+  margin-bottom: 10px;
+}
+
+.insert-frame-preview {
+  margin: 10px 0;
+}
+
+.insert-frame-preview .frame-picker-wrapper {
+  height: 120px;
+}

src/css/dialogs.css

@@ -48,19 +48,6 @@
   margin-top: 0;
 }
 
-#dialog-container.browse-local {
-  width: 700px;
-  height: 500px;
-  top : 50%;
-  left : 50%;
-  position : absolute;
-  margin-left: -350px;
-}
-
-.show #dialog-container.browse-local {
-  margin-top: -250px;
-}
-
 .dialog-wrapper {
   height: 100%;
   position : relative;

src/css/frames-list.css

@@ -54,6 +54,9 @@
 }
 
 .add-frame-action {
+  display: flex;
+  align-items: center;
+
   margin-top: 8px;
   padding: 6px 0;
   overflow: hidden;
@@ -71,6 +74,7 @@
 .add-frame-action-icon {
   margin: 3px;
   float: left;
+  flex-shrink: 0;
 }
 
 .add-frame-action .label {

src/css/reset.css

@@ -5,6 +5,7 @@ html, body {
   cursor : default;
   font-family: Arial;
   font-size: 11px;
+  line-height: 1.1;
   -webkit-touch-callout: none;
   -webkit-user-select: none;
   -khtml-user-select: none;

src/css/settings-application.css

@@ -1,6 +1,14 @@
-/*******************************/
-/*  Application Setting panel  */
-/*******************************/
+/********************************/
+/*  Preferences Settings panel  */
+/********************************/
+
+.settings-section-preferences {
+  height: 100%;
+  position: relative;
+  overflow: hidden;
+  margin: 0 20px;
+  height: 100%;
+}
 
 .background-picker-wrapper {
   display: inline-block;
@@ -35,14 +43,11 @@
   vertical-align: middle;
 }
 
-.layer-opacity-input {
+.layer-opacity-input,
+.tile-mask-opacity-input {
   width: 100px;
 }
 
-.seamless-opacity-input {
-  width: 75px;
-}
-
 .settings-opacity-text {
   height: 31px;
   display: inline-block;
@@ -54,16 +59,76 @@
   text-align: center;
 }
 
+.settings-item-grid-size,
+.settings-item-grid-color {
+  display: flex;
+  align-items: center;
+}
+
+.settings-item-grid-size > label,
+.settings-item-grid-color > label {
+  width: 65px;
+  flex-shrink: 0;
+}
+
+.settings-item-grid-size .size-picker-option {
+  border-color: #888;
+}
+
+.settings-item-grid-size .size-picker-option:not(.selected):hover {
+  border-color: white;
+}
+
 .grid-width-select,
 .color-format-select {
   margin: 5px 5px 0 5px;
 }
 
-.settings-section-application > .settings-title {
+
+.grid-colors-list {
+  overflow: hidden;
+  padding: 0 5px;
+}
+
+.grid-colors-item {
+  float: left;
+  width: 20px;
+  height: 20px;
+  cursor: pointer;
+  border: 2px solid #888;
+  margin-right: 2px;
+  margin-bottom: 2px;
+  box-sizing: border-box;
+}
+
+.grid-colors-item:hover {
+  border-color: white;
+}
+
+.grid-colors-item.selected {
+  border-color: gold;
+}
+
+.settings-section-preferences > .settings-title {
   /* Override the default 10px margin bottom for this panel */
   margin-bottom: 15px;
 }
 
-.settings-section-application .button-primary {
+.settings-section-preferences .button-primary {
   margin-top: 10px;
 }
+
+.settings-version-info {
+  position: absolute;
+  bottom: 10px;
+  right: 10px;
+  color: #888;
+}
+
+/* Override default link styles for the release notes link
+   It doesn't need to popout too much */
+.settings-version,
+.settings-version:hover {
+  color: white !important;
+  text-decoration: none !important;
+}

src/css/settings-export.css

@@ -43,8 +43,29 @@
   float : left;
 }
 
+.gif-export-warning {
+  display: none;
+}
+
+.gif-export-warning.visible {
+  display: flex;
+  align-items: center;
+  border: 1px solid red;
+  padding: 5px;
+  margin: 5px 0;
+}
+
+.gif-export-warning-icon {
+  flex-shrink: 0;
+  margin-right: 5px;
+}
+
+.gif-export-warning-message {
+  font-weight: normal;
+}
+
 .preview-upload-ongoing:before{
-  content: "Upload ongoing ...";
+  content: "Upload in progress...";
   position: absolute;
   display: block;
   height: 100%;
@@ -100,45 +121,6 @@
   line-height: 23px;
 }
 
-.export-tabs {
-  overflow: hidden;
-  position: relative;
-}
-
-.export-tabs:after {
-  content: "";
-  display: block;
-  position: absolute;
-  bottom: 0;
-  width: 100%;
-  height: 1px;
-  z-index: 0;
-  background-color: var(--highlight-color);
-}
-
-.export-tab {
-  float: left;
-  cursor: pointer;
-  padding: 5px;
-  border: 1px solid transparent;
-  border-radius: 2px 2px 0 0;
-  /* Make sure the tab and its border are positioned above the :after element; */
-  position: relative;
-  z-index: 1;
-}
-
-.export-tab.selected,
-.export-tab:hover {
-  color: var(--highlight-color);
-}
-
-.export-tab.selected {
-  border-color: var(--highlight-color);
-  border-bottom-color: #444;
-  border-style: solid;
-  border-width: 1px;
-}
-
 .export-panel-header {
   padding: 10px 5px 0px;
 }

src/css/settings-resize.css

@@ -5,103 +5,8 @@
   width: 25%;
 }
 
-/*****************/
-/* ANCHOR WIDGET */
-/*****************/
-
-.resize-origin-container {
-  overflow: hidden;
+.resize-anchor-container {
   position: relative;
-  width: 70px;
   margin-top: 5px;
   display: inline-block;
 }
-
-.transition .resize-origin-option,
-.transition .resize-origin-option:before {
-  transition: background-color 0.2s, border-color 0.2s;
-}
-
-.resize-origin-option {
-  float: left;
-  position: relative;
-
-  box-sizing: border-box;
-  margin: 0 1px 1px 0;
-  width: 20px;
-  height: 20px;
-
-  background : #888;
-
-  font-size: 8px;
-  text-align: center;
-  cursor: pointer;
-}
-
-.disabled .resize-origin-option {
-  cursor: default;
-  background : #555;
-  border-color: #555 !important;
-}
-
-.resize-origin-option:hover {
-  border : 3px solid white;
-}
-
-.resize-origin-option.selected {
-  border : 3px solid var(--highlight-color);
-}
-
-.resize-origin-option:before {
-  content: '';
-  position: absolute;
-  display: block;
-  top: 50%;
-  left: 50%;
-  margin: -2px;
-}
-
-.resize-origin-option.selected:before {
-  content: '';
-  width: 4px;
-  height: 4px;
-  background: var(--highlight-color);
-}
-
-.disabled .resize-origin-option.selected:before {
-  background: #555;
-}
-
-.disabled .resize-origin-option[data-neighbor]:before {
-  border-color: #555 !important;
-}
-
-.resize-origin-option[data-neighbor]:before {
-  width: 0;
-  height: 0;
-  border-width: 4px;
-  border-style: solid;
-  border-color: transparent;
-}
-
-.resize-origin-option[data-neighbor="bottom"]:before {
-  border-top-color: var(--highlight-color);
-  margin-left: -4px;
-}
-
-.resize-origin-option[data-neighbor="left"]:before {
-  border-right-color: var(--highlight-color);
-  margin-top: -4px;
-  margin-left: -6px;
-}
-
-.resize-origin-option[data-neighbor="top"]:before {
-  border-bottom-color: var(--highlight-color);
-  margin-top: -6px;
-  margin-left: -4px;
-}
-
-.resize-origin-option[data-neighbor="right"]:before {
-  border-left-color: var(--highlight-color);
-  margin-top: -4px;
-}

src/css/sprites.css

@@ -1,113 +0,0 @@
-/*
-Icon classes can be used entirely standalone. They are named after their original file names.
-
-```html
-<!-- `display: block` sprite -->
-<div class="icon-home"></div>
-
-<!-- `display: inline-block` sprite -->
-<img class="icon-home" />
-```
-*/
-.icon-cloud_export {
-  background-image: url(../img/spritesheet.png);
-  background-position: -512px -276px;
-  width: 50px;
-  height: 47px;
-}
-.icon-dragndrop {
-  background-image: url(../img/spritesheet.png);
-  background-position: -564px -173px;
-  width: 48px;
-  height: 48px;
-}
-.icon-duplicate {
-  background-image: url(../img/spritesheet.png);
-  background-position: -512px -369px;
-  width: 16px;
-  height: 16px;
-}
-.icon-export {
-  background-image: url(../img/spritesheet.png);
-  background-position: -564px -225px;
-  width: 43px;
-  height: 42px;
-}
-.icon-favicon {
-  background-image: url(../img/spritesheet.png);
-  background-position: -582px -151px;
-  width: 16px;
-  height: 16px;
-}
-.icon-gallery {
-  background-image: url(../img/spritesheet.png);
-  background-position: -512px -225px;
-  width: 52px;
-  height: 51px;
-}
-.icon-garbage {
-  background-image: url(../img/spritesheet.png);
-  background-position: 0px 0px;
-  width: 512px;
-  height: 512px;
-}
-.icon-gear {
-  background-image: url(../img/spritesheet.png);
-  background-position: -563px -323px;
-  width: 38px;
-  height: 37px;
-}
-.icon-import-icon {
-  background-image: url(../img/spritesheet.png);
-  background-position: -576px -69px;
-  width: 28px;
-  height: 36px;
-}
-.icon-keyboard {
-  background-image: url(../img/spritesheet.png);
-  background-position: -512px -133px;
-  width: 70px;
-  height: 40px;
-}
-.icon-local-storage-icon {
-  background-image: url(../img/spritesheet.png);
-  background-position: -512px 0px;
-  width: 100px;
-  height: 69px;
-}
-.icon-merge-icon {
-  background-image: url(../img/spritesheet.png);
-  background-position: -512px -69px;
-  width: 64px;
-  height: 64px;
-}
-.icon-plus {
-  background-image: url(../img/spritesheet.png);
-  background-position: -512px -323px;
-  width: 51px;
-  height: 46px;
-}
-.icon-popup-preview-arrow-gold {
-  background-image: url(../img/spritesheet.png);
-  background-position: -576px -105px;
-  width: 24px;
-  height: 18px;
-}
-.icon-popup-preview-arrow-white {
-  background-image: url(../img/spritesheet.png);
-  background-position: -582px -133px;
-  width: 24px;
-  height: 18px;
-}
-.icon-resize-icon {
-  background-image: url(../img/spritesheet.png);
-  background-position: -512px -173px;
-  width: 52px;
-  height: 52px;
-}
-.icon-save {
-  background-image: url(../img/spritesheet.png);
-  background-position: -562px -276px;
-  width: 43px;
-  height: 42px;
-}

src/css/style.css

@@ -52,7 +52,16 @@ body {
 }
 
 .checkbox-fix {
-  margin-left: 0;
+  margin: 3px 3px 3px 0;
+}
+
+.checkbox-container {
+  display: flex;
+  align-items: center;
+}
+
+.hidden {
+  display: none;
 }
 
 /**

src/css/toolbox-palettes-list.css

@@ -76,6 +76,11 @@
   position: relative;
 }
 
+.palettes-list-colors.tiny > .palettes-list-color {
+  width: calc((100% - 35px) / 10);
+  height: 16px;
+}
+
 .palettes-list-color div {
   height: 100%;
 }
@@ -121,7 +126,8 @@
  * Color index for the 9 first colors
  */
 
-.palettes-list-color:nth-child(-n+10):after {
+:not(.tiny) > .palettes-list-color:nth-child(-n+10):after {
+  content: attr(data-color-index);
   position: absolute;
   top: 0;
   right: 0;
@@ -136,39 +142,3 @@
   padding: 2px 3px 2px 3px;
   border-radius: 0 0 0 2px;
 }
-
-.palettes-list-color:nth-child(1):after {
-  content: "1";
-}
-
-.palettes-list-color:nth-child(2):after {
-  content: "2";
-}
-
-.palettes-list-color:nth-child(3):after {
-  content: "3";
-}
-
-.palettes-list-color:nth-child(4):after {
-  content: "4";
-}
-
-.palettes-list-color:nth-child(5):after {
-  content: "5";
-}
-
-.palettes-list-color:nth-child(6):after {
-  content: "6";
-}
-
-.palettes-list-color:nth-child(7):after {
-  content: "7";
-}
-
-.palettes-list-color:nth-child(8):after {
-  content: "8";
-}
-
-.palettes-list-color:nth-child(9):after {
-  content: "9";
-}

src/css/transformations.css

@@ -3,5 +3,38 @@
 }
 
 .transformations-container .tool-icon {
-  float:left;
+  margin: 0 0 5px 0;
+}
+
+.transformations-container .tools-wrapper {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  height: 46px;
+
+  /* Override the float:left set on tools-wrapper in layout.css; */
+  float: initial;
+}
+
+.transformations-container.show-more .tools-wrapper {
+  height: auto;
+  /* Compensate the 5px bottom-margin coming from the tool-icon */
+  margin-bottom: -5px;
+}
+
+.transformations-show-more-link {
+  position: absolute;
+  color: #999;
+  right: 10px;
+  font-weight: normal;
+  cursor: pointer;
+  transition: 0.2s linear;
+}
+
+.transformations-show-more-link:hover {
+  color: white;
+}
+
+.show-more .transformations-show-more-link {
+  color: gold;
 }

src/css/widgets-anchor.css

@@ -0,0 +1,98 @@
+/*****************/
+/* ANCHOR WIDGET */
+/*****************/
+
+.anchor-wrapper {
+  overflow: hidden;
+  width: 70px;
+}
+
+/* When transitioning between enabled and disabled states */
+.transition .anchor-option,
+.transition .anchor-option:before {
+  transition: background-color 0.2s, border-color 0.2s;
+}
+
+.anchor-option {
+  float: left;
+  position: relative;
+
+  box-sizing: border-box;
+  margin: 0 1px 1px 0;
+  width: 20px;
+  height: 20px;
+
+  background : #888;
+
+  font-size: 8px;
+  text-align: center;
+  cursor: pointer;
+}
+
+.disabled .anchor-option {
+  cursor: default;
+  background : #555;
+  border-color: #555 !important;
+}
+
+.anchor-option:hover {
+  border : 3px solid white;
+}
+
+.anchor-option.selected {
+  border : 3px solid var(--highlight-color);
+}
+
+.anchor-option:before {
+  content: '';
+  position: absolute;
+  display: block;
+  top: 50%;
+  left: 50%;
+  margin: -2px;
+}
+
+.anchor-option.selected:before {
+  content: '';
+  width: 4px;
+  height: 4px;
+  background: var(--highlight-color);
+}
+
+.disabled .anchor-option.selected:before {
+  background: #555;
+}
+
+.disabled .anchor-option[data-neighbor]:before {
+  border-color: #555 !important;
+}
+
+.anchor-option[data-neighbor]:before {
+  width: 0;
+  height: 0;
+  border-width: 4px;
+  border-style: solid;
+  border-color: transparent;
+}
+
+.anchor-option[data-neighbor="bottom"]:before {
+  border-top-color: var(--highlight-color);
+  margin-left: -4px;
+}
+
+.anchor-option[data-neighbor="left"]:before {
+  border-right-color: var(--highlight-color);
+  margin-top: -4px;
+  margin-left: -6px;
+}
+
+.anchor-option[data-neighbor="top"]:before {
+  border-bottom-color: var(--highlight-color);
+  margin-top: -6px;
+  margin-left: -4px;
+}
+
+.anchor-option[data-neighbor="right"]:before {
+  border-left-color: var(--highlight-color);
+  margin-top: -4px;
+}

src/css/widgets-frame-picker.css

@@ -0,0 +1,55 @@
+/***********************/
+/* FRAME PICKER WIDGET */
+/***********************/
+
+.frame-picker-wrapper {
+  width: 150px;
+  height: 150px;
+  border: 3px solid #666;
+  border-radius: 3px;
+}
+
+.frame-viewer {
+  width: 100%;
+  height: calc(100% - 25px);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+
+}
+
+.frame-viewer > canvas,
+.frame-viewer > img {
+  max-width: 100%;
+  max-height: 100%;
+}
+
+.frame-nav {
+  display: flex;
+  width: 100%;
+  height: 24px;
+  border-top: 1px solid #666;
+}
+
+.frame-nav .button {
+  flex-shrink: 0;
+  border-radius: 0;
+  height: 24px;
+  background-color: #3f3f3f;
+}
+
+.frame-nav .button[disabled],
+.frame-nav .button[disabled]:hover {
+    background-color: #aaa;
+}
+
+.frame-nav .button + .button {
+  border-left: 1px solid #333;
+}
+
+.frame-nav-input {
+  min-width: 1px;
+  border-style: none;
+  height: 24px;
+  text-align: center;
+}

src/css/widgets-size-picker.css

@@ -1,9 +1,13 @@
-.pen-size-container {
+/***********************/
+/* SIZE PICKER WIDGET */
+/***********************/
+
+.size-picker-container {
   overflow: hidden;
   padding: 5px 5px;
 }
 
-.pen-size-option {
+.size-picker-option {
   float: left;
   box-sizing: border-box;
   width: 20px;
@@ -15,20 +19,20 @@
   cursor: pointer;
 }
 
-.pen-size-option[data-size='1'] {
+.size-picker-option[data-size='1'] {
   padding: 5px;
 }
-.pen-size-option[data-size='2'] {
+.size-picker-option[data-size='2'] {
   padding: 4px;
 }
-.pen-size-option[data-size='3'] {
+.size-picker-option[data-size='3'] {
   padding: 3px;
 }
-.pen-size-option[data-size='4'] {
+.size-picker-option[data-size='4'] {
   padding: 2px;
 }
 
-.pen-size-option:before {
+.size-picker-option:before {
   content: '';
   width: 100%;
   height: 100%;
@@ -39,19 +43,19 @@
   font-size: 90%;
 }
 
-.pen-size-option:hover {
+.size-picker-option:hover {
   border-color: #888;
 }
 
-.pen-size-option.selected:before {
+.size-picker-option.selected:before {
   background-color: var(--highlight-color);
 }
 
-.pen-size-option.selected {
+.size-picker-option.selected {
   border-color: var(--highlight-color);
 }
 
-.pen-size-option.labeled:before {
-  content: attr(real-pen-size);
+.size-picker-option.labeled:before {
+  content: attr(real-size);
   color: black;
 }

src/css/widgets-tabs.css

@@ -0,0 +1,42 @@
+/*****************/
+/*  TABS WIDGET  */
+/*****************/
+
+.tab-list {
+  overflow: hidden;
+  position: relative;
+}
+
+.tab-list:after {
+  content: "";
+  display: block;
+  position: absolute;
+  bottom: 0;
+  width: 100%;
+  height: 1px;
+  z-index: 0;
+  background-color: var(--highlight-color);
+}
+
+.tab-item {
+  float: left;
+  cursor: pointer;
+  padding: 5px;
+  border: 1px solid transparent;
+  border-radius: 2px 2px 0 0;
+  /* Make sure the tab and its border are positioned above the :after element; */
+  position: relative;
+  z-index: 1;
+}
+
+.tab-item.selected,
+.tab-item:hover {
+  color: var(--highlight-color);
+}
+
+.tab-item.selected {
+  border-color: var(--highlight-color);
+  border-bottom-color: #444;
+  border-style: solid;
+  border-width: 1px;
+}

src/css/widgets-wizard.css

@@ -0,0 +1,32 @@
+.wizard-wrapper {
+  z-index: 1;
+  position: relative;
+  width: 100%;
+  height: 100%;
+  overflow: hidden;
+}
+
+.wizard-step {
+  z-index: -1;
+  margin-left: calc(100% + 5px);
+  position: absolute;
+}
+
+.current-step {
+  z-index: 1;
+  margin-left: 0;
+}
+
+.current-step-in,
+.current-step-out {
+  z-index: 10;
+  transition: margin-left 200ms;
+}
+
+.current-step-in {
+  margin-left: 0;
+}
+
+.current-step-out {
+  margin-left: 100%;
+}

src/index.html

@@ -22,9 +22,7 @@
     color:white;">
       <span style="top:45%">Loading Piskel ...</span>
   </div>
-  <!--standalone-start-->
   @@include('templates/debug-header.html', {})
-  <!--standalone-end-->
 
   <!-- the comment below indicates the beginning of markup reused by the editor integrated in piskelapp.com -->
   <!-- do not delete, do not move :) -->
@@ -69,6 +67,7 @@
   </div>
 
   @@include('templates/misc-templates.html', {})
+  @@include('templates/data-uri-export.html', {})
   @@include('templates/popup-preview.html', {})
 
   <span class="cheatsheet-link icon-common-keyboard-gold"
@@ -77,15 +76,19 @@
        rel="tooltip" data-placement="left" title="Performance problem detected, learn more.">&nbsp;</div>
 
   <!-- dialogs partials -->
-  @@include('templates/dialogs/create-palette.html', {})
-  @@include('templates/dialogs/import-image.html', {})
+  @@include('templates/dialogs/browse-backups.html', {})
   @@include('templates/dialogs/browse-local.html', {})
   @@include('templates/dialogs/cheatsheet.html', {})
+  @@include('templates/dialogs/create-palette.html', {})
+  @@include('templates/dialogs/import.html', {})
   @@include('templates/dialogs/performance-info.html', {})
   @@include('templates/dialogs/unsupported-browser.html', {})
 
   <!-- settings-panel partials -->
-  @@include('templates/settings/application.html', {})
+  @@include('templates/settings/preferences.html', {})
+  @@include('templates/settings/preferences/grid.html', {})
+  @@include('templates/settings/preferences/misc.html', {})
+  @@include('templates/settings/preferences/tile.html', {})
   @@include('templates/settings/resize.html', {})
   @@include('templates/settings/save.html', {})
   @@include('templates/settings/import.html', {})

src/js/.eslintrc

@@ -0,0 +1,99 @@
+{
+  "env": {
+    "es6": true,
+    "browser": true
+  },
+  "globals": {
+    "$": true,
+    "jQuery": true,
+    "pskl": true,
+    "Events": true,
+    "Constants": true,
+    "console": true,
+    "module": true,
+    "require": true,
+    "Q": true,
+    "Promise": true
+  },
+  "rules": {
+    "no-undef": 2,
+    "no-use-before-define": [
+      2,
+      {
+        "functions": false
+      }
+    ],
+    "curly": [
+      2,
+      "all"
+    ],
+    "operator-linebreak": [
+      2,
+      "after"
+    ],
+    "camelcase": [
+      2,
+      {
+        "properties": "never"
+      }
+    ],
+    "max-len": [
+      2,
+      120
+    ],
+    "indent": [
+      2,
+      2,
+      {
+        "SwitchCase": 1
+      }
+    ],
+    "quotes": [
+      2,
+      "single"
+    ],
+    "no-multi-str": 2,
+    "no-mixed-spaces-and-tabs": 2,
+    "no-trailing-spaces": 2,
+    "space-unary-ops": [
+      2,
+      {
+        "nonwords": false,
+        "overrides": {}
+      }
+    ],
+    "one-var": [
+      2,
+      "never"
+    ],
+    "brace-style": [
+      2,
+      "1tbs",
+      {
+        "allowSingleLine": true
+      }
+    ],
+    "keyword-spacing": [
+      2,
+      {}
+    ],
+    "space-infix-ops": 2,
+    "space-before-blocks": [
+      2,
+      "always"
+    ],
+    "eol-last": 2,
+    "space-in-parens": [
+      2,
+      "never"
+    ],
+    "no-multiple-empty-lines": 2,
+    "no-with": 2,
+    "no-spaced-func": 2,
+    "dot-notation": 2,
+    "semi": [
+      2,
+      "always"
+    ]
+  }
+}

src/js/Constants.js

@@ -12,7 +12,7 @@ var Constants = {
   MAX_HEIGHT : 1024,
   MAX_WIDTH : 1024,
 
-  MAX_PALETTE_COLORS : 100,
+  MAX_PALETTE_COLORS : 256,
   // allow current colors service to get up to 256 colors.
   // GIF generation is different if the color count goes over 256.
   MAX_WORKER_COLORS : 256,
@@ -58,8 +58,11 @@ var Constants = {
   // The datastore limit is 1 MiB, which we roughly approximate to 1 million characters.
   APPENGINE_SAVE_LIMIT : 1 * 1024 * 1024,
 
+  // Message displayed when an action will lead to erase the current animation.
+  CONFIRM_OVERWRITE: 'This will replace your current animation, are you sure you want to continue?',
+
   // SERVICE URLS
   APPENGINE_SAVE_URL : 'save',
-  IMAGE_SERVICE_UPLOAD_URL : 'http://piskel-imgstore-b.appspot.com/__/upload',
-  IMAGE_SERVICE_GET_URL : 'http://piskel-imgstore-b.appspot.com/img/'
+  IMAGE_SERVICE_UPLOAD_URL : '{{protocol}}://piskel-imgstore-b.appspot.com/__/upload',
+  IMAGE_SERVICE_GET_URL : '{{protocol}}://piskel-imgstore-b.appspot.com/img/'
 };

src/js/Events.js

@@ -15,7 +15,7 @@ var Events = {
   DRAG_START : 'DRAG_START',
   DRAG_END : 'DRAG_END',
 
-  DIALOG_DISPLAY : 'DIALOG_DISPLAY',
+  DIALOG_SHOW : 'DIALOG_SHOW',
   DIALOG_HIDE : 'DIALOG_HIDE',
 
   PALETTE_LIST_UPDATED : 'PALETTE_LIST_UPDATED',
@@ -64,9 +64,10 @@ var Events = {
   SELECTION_CREATED: 'SELECTION_CREATED',
   SELECTION_MOVE_REQUEST: 'SELECTION_MOVE_REQUEST',
   SELECTION_DISMISSED: 'SELECTION_DISMISSED',
-  SELECTION_COPY: 'SELECTION_COPY',
-  SELECTION_CUT: 'SELECTION_CUT',
-  SELECTION_PASTE: 'SELECTION_PASTE',
+
+  CLIPBOARD_COPY: 'CLIPBOARD_COPY',
+  CLIPBOARD_CUT: 'CLIPBOARD_CUT',
+  CLIPBOARD_PASTE: 'CLIPBOARD_PASTE',
 
   SHOW_NOTIFICATION: 'SHOW_NOTIFICATION',
   HIDE_NOTIFICATION: 'HIDE_NOTIFICATION',

src/js/app.js

@@ -10,11 +10,17 @@
   ns.app = {
 
     init : function () {
+      // Run preferences migration scripts for version v0.12.0
+      pskl.UserSettings.migrate_to_v0_12();
+
       /**
        * When started from APP Engine, appEngineToken_ (Boolean) should be set on window.pskl
        */
       this.isAppEngineVersion = !!pskl.appEngineToken_;
 
+      // This id is used to keep track of sessions in the BackupService.
+      this.sessionId = pskl.utils.Uuid.generate();
+
       this.shortcutService = new pskl.service.keyboard.ShortcutService();
       this.shortcutService.init();
 
@@ -78,7 +84,7 @@
 
       this.framesListController = new pskl.controller.FramesListController(
         this.piskelController,
-        $('#preview-list'));
+        $('#preview-list-wrapper').get(0));
       this.framesListController.init();
 
       this.layersListController = new pskl.controller.LayersListController(this.piskelController);
@@ -111,6 +117,9 @@
       this.canvasBackgroundController = new pskl.controller.CanvasBackgroundController();
       this.canvasBackgroundController.init();
 
+      this.indexedDbStorageService = new pskl.service.storage.IndexedDbStorageService(this.piskelController);
+      this.indexedDbStorageService.init();
+
       this.localStorageService = new pskl.service.storage.LocalStorageService(this.piskelController);
       this.localStorageService.init();
 
@@ -165,6 +174,9 @@
         this.currentColorsService);
       this.performanceReportService.init();
 
+      this.clipboardService = new pskl.service.ClipboardService(this.piskelController);
+      this.clipboardService.init();
+
       this.drawingLoop = new pskl.rendering.DrawingLoop();
       this.drawingLoop.addCallback(this.render, this);
       this.drawingLoop.start();
@@ -187,11 +199,16 @@
         gui.Window.get().menu = mb;
       }
 
-      if (pskl.utils.UserAgent.isUnsupported()) {
-        $.publish(Events.DIALOG_DISPLAY, {
+      if (!pskl.utils.Environment.isIntegrationTest() && pskl.utils.UserAgent.isUnsupported()) {
+        $.publish(Events.DIALOG_SHOW, {
           dialogId : 'unsupported-browser'
         });
       }
+
+      if (pskl.utils.Environment.isDebug()) {
+        pskl.app.shortcutService.registerShortcut(pskl.service.keyboard.Shortcuts.DEBUG.RELOAD_STYLES,
+          window.reloadStyles);
+      }
     },
 
     loadPiskel_ : function (piskelData) {

src/js/controller/DrawingController.js

@@ -64,6 +64,10 @@
     pskl.app.shortcutService.registerShortcut(shortcuts.MISC.RESET_ZOOM, this.resetZoom_.bind(this));
     pskl.app.shortcutService.registerShortcut(shortcuts.MISC.INCREASE_ZOOM, this.updateZoom_.bind(this, 1));
     pskl.app.shortcutService.registerShortcut(shortcuts.MISC.DECREASE_ZOOM, this.updateZoom_.bind(this, -1));
+    pskl.app.shortcutService.registerShortcut(shortcuts.MISC.OFFSET_UP, this.updateOffset_.bind(this, 'up'));
+    pskl.app.shortcutService.registerShortcut(shortcuts.MISC.OFFSET_RIGHT, this.updateOffset_.bind(this, 'right'));
+    pskl.app.shortcutService.registerShortcut(shortcuts.MISC.OFFSET_DOWN, this.updateOffset_.bind(this, 'down'));
+    pskl.app.shortcutService.registerShortcut(shortcuts.MISC.OFFSET_LEFT, this.updateOffset_.bind(this, 'left'));
 
     window.setTimeout(function () {
       this.afterWindowResize_();
@@ -163,6 +167,9 @@
 
     if (event.button === Constants.MIDDLE_BUTTON) {
       this.dragHandler.startDrag(event.clientX, event.clientY);
+    } else if (event.altKey && !this.currentToolBehavior.supportsAlt()) {
+      this.currentToolBehavior.hideHighlightedPixel(this.overlayFrame);
+      this.isPickingColor = true;
     } else {
       this.currentToolBehavior.hideHighlightedPixel(this.overlayFrame);
       $.publish(Events.TOOL_PRESSED);
@@ -210,6 +217,8 @@
     if (this.isClicked) {
       if (pskl.app.mouseStateService.isMiddleButtonPressed()) {
         this.dragHandler.updateDrag(x, y);
+      } else if (this.isPickingColor) {
+        // Nothing to do on mousemove when picking a color with ALT+click.
       } else {
         $.publish(Events.MOUSE_EVENT, [event, this]);
         this.currentToolBehavior.moveToolAt(
@@ -257,6 +266,29 @@
     this.updateZoom_(modifier, coords);
   };
 
+  /**
+   * Update the current viewport offset of 1 pixel in the provided direction.
+   * Direction can be one of 'up', 'right', 'down', 'left'.
+   * Callback for the OFFSET_${DIR} shortcuts.
+   */
+  ns.DrawingController.prototype.updateOffset_ = function (direction) {
+    var off = this.getOffset();
+    if (direction === 'up') {
+      off.y -= 1;
+    } else if (direction === 'right') {
+      off.x += 1;
+    } else if (direction === 'down') {
+      off.y += 1;
+    } else if (direction === 'left') {
+      off.x -= 1;
+    }
+
+    this.setOffset(
+      off.x,
+      off.y
+    );
+  };
+
   /**
    * Update the current zoom level by a given multiplier.
    *
@@ -294,12 +326,15 @@
    * @private
    */
   ns.DrawingController.prototype.onMouseup_ = function (event) {
-    var frame = this.piskelController.getCurrentFrame();
+    if (!this.isClicked) {
+      return;
+    }
+
     var coords = this.getSpriteCoordinates(event.clientX, event.clientY);
     if (event.changedTouches && event.changedTouches[0]) {
       coords = this.getSpriteCoordinates(event.changedTouches[0].clientX, event.changedTouches[0].clientY);
     }
-    if (this.isClicked) {
+
     // A mouse button was clicked on the drawing canvas before this mouseup event,
     // the user was probably drawing on the canvas.
     // Note: The mousemove movement (and the mouseup) may end up outside
@@ -307,14 +342,19 @@
 
     this.isClicked = false;
 
-      if (pskl.app.mouseStateService.isMiddleButtonPressed()) {
-        if (this.dragHandler.isDragging()) {
+    var isMiddleButton = pskl.app.mouseStateService.isMiddleButtonPressed();
+    var isMiddleClick = isMiddleButton && !this.dragHandler.isDragging();
+    var isMiddleDrag = isMiddleButton && this.dragHandler.isDragging();
+
+    if (this.isPickingColor || isMiddleClick) {
+      // Picking color after ALT+click or middle mouse button click.
+      this.pickColorAt_(coords);
+      this.isPickingColor = false;
+    } else if (isMiddleDrag) {
+      // Stop the drag handler after a middle button drag action.
       this.dragHandler.stopDrag();
-        } else if (frame.containsPixel(coords.x, coords.y)) {
-          var color = pskl.utils.intToColor(frame.getPixel(coords.x, coords.y));
-          $.publish(Events.SELECT_PRIMARY_COLOR, [color]);
-        }
     } else {
+      // Regular tool click, release the current tool.
       this.currentToolBehavior.releaseToolAt(
         coords.x,
         coords.y,
@@ -322,11 +362,27 @@
         this.overlayFrame,
         event
       );
-
       $.publish(Events.TOOL_RELEASED);
     }
+
     $.publish(Events.MOUSE_EVENT, [event, this]);
+  };
+
+  /**
+   * Send a COLOR selection event for the color contained at the provided coordinates.
+   * No-op if the coordinate is outside of the drawing canvas.
+   * @param  {Object} coords {x: Number, y: Number}
+   */
+  ns.DrawingController.prototype.pickColorAt_ = function (coords) {
+    var frame = this.piskelController.getCurrentFrame();
+    if (!frame.containsPixel(coords.x, coords.y)) {
+      return;
     }
+
+    var color = pskl.utils.intToColor(frame.getPixel(coords.x, coords.y));
+    var isRightButton = pskl.app.mouseStateService.isRightButtonPressed();
+    var evt = isRightButton ? Events.SELECT_SECONDARY_COLOR : Events.SELECT_PRIMARY_COLOR;
+    $.publish(evt, [color]);
   };
 
   /**

src/js/controller/FramesListController.js

@@ -11,6 +11,7 @@
   ns.FramesListController = function (piskelController, container) {
     this.piskelController = piskelController;
     this.container = container;
+    this.previewList = container.querySelector('#preview-list');
     this.refreshZoom_();
 
     this.redrawFlag = true;
@@ -31,8 +32,9 @@
 
     $.subscribe(Events.PISKEL_RESET, this.refreshZoom_.bind(this));
 
-    $('#preview-list-scroller').scroll(this.updateScrollerOverflows.bind(this));
-    this.container.get(0).addEventListener('click', this.onContainerClick_.bind(this));
+    this.previewListScroller = document.querySelector('#preview-list-scroller');
+    this.previewListScroller.addEventListener('scroll', this.updateScrollerOverflows.bind(this));
+    this.container.addEventListener('click', this.onContainerClick_.bind(this));
     this.updateScrollerOverflows();
   };
 
@@ -64,11 +66,11 @@
   };
 
   ns.FramesListController.prototype.updateScrollerOverflows = function () {
-    var scroller = $('#preview-list-scroller');
-    var scrollerHeight = scroller.height();
-    var scrollTop = scroller.scrollTop();
-    var scrollerContentHeight = $('#preview-list').height();
-    var treshold = $('.top-overflow').height();
+    var scroller = this.previewListScroller;
+    var scrollerHeight = scroller.offsetHeight;
+    var scrollTop = scroller.scrollTop;
+    var scrollerContentHeight = this.previewList.offsetHeight;
+    var treshold = this.container.querySelector('.top-overflow').offsetHeight;
     var overflowTop = false;
     var overflowBottom = false;
 
@@ -81,9 +83,8 @@
         overflowBottom = true;
       }
     }
-    var wrapper = $('#preview-list-wrapper');
-    wrapper.toggleClass('top-overflow-visible', overflowTop);
-    wrapper.toggleClass('bottom-overflow-visible', overflowBottom);
+    this.container.classList.toggle('top-overflow-visible', overflowTop);
+    this.container.classList.toggle('bottom-overflow-visible', overflowBottom);
   };
 
   ns.FramesListController.prototype.onContainerClick_ = function (event) {
@@ -97,12 +98,12 @@
     if (action === ACTION.CLONE) {
       this.piskelController.duplicateFrameAt(index);
       var clonedTile = this.createPreviewTile_(index + 1);
-      this.container.get(0).insertBefore(clonedTile, this.tiles[index].nextSibling);
+      this.previewList.insertBefore(clonedTile, this.tiles[index].nextSibling);
       this.tiles.splice(index, 0, clonedTile);
       this.updateScrollerOverflows();
     } else if (action === ACTION.DELETE) {
       this.piskelController.removeFrameAt(index);
-      this.container.get(0).removeChild(this.tiles[index]);
+      this.previewList.removeChild(this.tiles[index]);
       this.tiles.splice(index, 1);
       this.updateScrollerOverflows();
     } else if (action === ACTION.SELECT && !this.justDropped) {
@@ -111,7 +112,7 @@
       this.piskelController.addFrame();
       var newtile = this.createPreviewTile_(this.tiles.length);
       this.tiles.push(newtile);
-      this.container.get(0).insertBefore(newtile, this.addFrameTile);
+      this.previewList.insertBefore(newtile, this.addFrameTile);
       this.updateScrollerOverflows();
     }
 
@@ -147,7 +148,7 @@
     }
 
     // Hide/Show buttons if needed
-    var buttons = this.container.get(0).querySelectorAll('.delete-frame-action, .dnd-action');
+    var buttons = this.container.querySelectorAll('.delete-frame-action, .dnd-action');
     var display = (this.piskelController.getFrameCount() > 1) ? 'block' : 'none';
     for (i = 0, length = buttons.length; i < length; i++) {
       buttons[i].style.display = display;
@@ -158,7 +159,8 @@
   };
 
   ns.FramesListController.prototype.createPreviews_ = function () {
-    this.container.html('');
+    this.previewList.innerHTML = '';
+
     // Manually remove tooltips since mouseout events were shortcut by the DOM refresh:
     $('.tooltip').remove();
 
@@ -166,7 +168,7 @@
 
     for (var i = 0 ; i < frameCount ; i++) {
       var tile = this.createPreviewTile_(i);
-      this.container.append(tile);
+      this.previewList.appendChild(tile);
       this.tiles[i] = tile;
     }
     // Append 'new empty frame' button
@@ -176,7 +178,7 @@
     newFrameButton.setAttribute('data-tile-action', ACTION.NEW_FRAME);
     newFrameButton.innerHTML = '<div class="add-frame-action-icon icon-frame-plus-white">' +
       '</div><div class="label">Add new frame</div>';
-    this.container.append(newFrameButton);
+    this.previewList.appendChild(newFrameButton);
     this.addFrameTile = newFrameButton;
 
     this.updateScrollerOverflows();
@@ -186,8 +188,7 @@
    * @private
    */
   ns.FramesListController.prototype.initDragndropBehavior_ = function () {
-
-    $('#preview-list').sortable({
+    $(this.previewList).sortable({
       placeholder: 'preview-tile preview-tile-drop-proxy',
       update: $.proxy(this.onUpdate_, this),
       stop: $.proxy(this.onSortableStop_, this),
@@ -195,7 +196,7 @@
       axis: 'y',
       tolerance: 'pointer'
     });
-    $('#preview-list').disableSelection();
+    $(this.previewList).disableSelection();
   };
 
   /**

src/js/controller/HeaderController.js

@@ -31,7 +31,7 @@
       }
 
       if (this.piskelName_) {
-        this.piskelName_.innerHTML = name;
+        this.piskelName_.textContent = name;
       }
     } catch (e) {
       console.warn('Could not update header : ' + e.message);

src/js/controller/LayersListController.js

@@ -17,6 +17,7 @@
     this.rootEl.addEventListener('click', this.onClick_.bind(this));
     this.toggleLayerPreviewEl.addEventListener('click', this.toggleLayerPreview_.bind(this));
 
+    this.createButtonTooltips_();
     this.initToggleLayerPreview_();
 
     this.renderLayerList_();
@@ -27,18 +28,44 @@
   };
 
   ns.LayersListController.prototype.renderLayerList_ = function () {
+    // Backup scroll before refresh.
+    var scrollTop = this.layersListEl.scrollTop;
+
     this.layersListEl.innerHTML = '';
     var layers = this.piskelController.getLayers();
     layers.forEach(this.addLayerItem.bind(this));
     this.updateButtonStatus_();
 
+    // Restore scroll
+    this.layersListEl.scrollTop = scrollTop;
+
     // Ensure the currently the selected layer is visible.
     var currentLayerEl = this.layersListEl.querySelector('.current-layer-item');
     if (currentLayerEl) {
-      currentLayerEl.scrollIntoView({behavior: 'smooth'});
+      currentLayerEl.scrollIntoViewIfNeeded(false);
     }
   };
 
+  ns.LayersListController.prototype.createButtonTooltips_ = function () {
+    var addTooltip = pskl.utils.TooltipFormatter.format('Create a layer', null, [
+      {key : 'shift', description : 'Clone current layer'}
+    ]);
+    var addButton = this.rootEl.querySelector('[data-action="add"]');
+    addButton.setAttribute('title', addTooltip);
+
+    var moveDownTooltip = pskl.utils.TooltipFormatter.format('Move layer down', null, [
+      {key : 'shift', description : 'Move to the bottom'}
+    ]);
+    var moveDownButton = this.rootEl.querySelector('[data-action="down"]');
+    moveDownButton.setAttribute('title', moveDownTooltip);
+
+    var moveUpTooltip = pskl.utils.TooltipFormatter.format('Move layer up', null, [
+      {key : 'shift', description : 'Move to the top'}
+    ]);
+    var moveUpButton = this.rootEl.querySelector('[data-action="up"]');
+    moveUpButton.setAttribute('title', moveUpTooltip);
+  };
+
   ns.LayersListController.prototype.initToggleLayerPreview_ = function () {
     var descriptors = [{description : 'Opacity defined in PREFERENCES'}];
     var helpText = 'Preview all layers';
@@ -111,7 +138,7 @@
     var el = evt.target || evt.srcElement;
     var index;
     if (el.classList.contains('button')) {
-      this.onButtonClick_(el);
+      this.onButtonClick_(el, evt);
     } else if (el.classList.contains('layer-name')) {
       index = pskl.utils.Dom.getData(el, 'layerIndex');
       this.piskelController.setCurrentLayerIndex(parseInt(index, 10));
@@ -139,14 +166,18 @@
     this.renderLayerList_();
   };
 
-  ns.LayersListController.prototype.onButtonClick_ = function (button) {
+  ns.LayersListController.prototype.onButtonClick_ = function (button, evt) {
     var action = button.getAttribute('data-action');
     if (action == 'up') {
-      this.piskelController.moveLayerUp();
+      this.piskelController.moveLayerUp(evt.shiftKey);
     } else if (action == 'down') {
-      this.piskelController.moveLayerDown();
+      this.piskelController.moveLayerDown(evt.shiftKey);
     } else if (action == 'add') {
+      if (evt.shiftKey) {
+        this.piskelController.duplicateCurrentLayer();
+      } else {
         this.piskelController.createLayer();
+      }
     } else if (action == 'delete') {
       this.piskelController.removeCurrentLayer();
     } else if (action == 'merge') {

src/js/controller/PalettesListController.js

@@ -51,12 +51,17 @@
   };
 
   ns.PalettesListController.prototype.fillColorListContainer = function () {
-
     var colors = this.getSelectedPaletteColors_();
 
     if (colors.length > 0) {
-      var html = colors.map(function (color, index) {
-        return pskl.utils.Template.replace(this.paletteColorTemplate_, {color : color, index : index});
+      var html = colors.filter(function (color) {
+        return !!color;
+      }).map(function (color, index) {
+        return pskl.utils.Template.replace(this.paletteColorTemplate_, {
+          color : color,
+          index : index + 1,
+          title : color.toUpperCase()
+        });
       }.bind(this)).join('');
       this.colorListContainer_.innerHTML = html;
 
@@ -64,6 +69,10 @@
     } else {
       this.colorListContainer_.innerHTML = pskl.utils.Template.get('palettes-list-no-colors-partial');
     }
+
+    // If we have more than 10 colors, use tiny mode, where 10 colors will fit on the same
+    // line.
+    this.colorListContainer_.classList.toggle('tiny', colors.length > 10);
   };
 
   ns.PalettesListController.prototype.selectPalette = function (paletteId) {
@@ -100,8 +109,8 @@
   ns.PalettesListController.prototype.getCurrentColorIndex_ = function () {
     var currentIndex = 0;
     var selectedColor = document.querySelector('.' + PRIMARY_COLOR_CLASSNAME);
-    if (selectedColor) {
-      currentIndex = parseInt(selectedColor.dataset.colorIndex, 10);
+    if (selectedColor) {
+      currentIndex = parseInt(selectedColor.dataset.colorIndex, 10) - 1;
     }
     return currentIndex;
   };
@@ -139,14 +148,14 @@
   };
 
   ns.PalettesListController.prototype.onCreatePaletteClick_ = function (evt) {
-    $.publish(Events.DIALOG_DISPLAY, {
+    $.publish(Events.DIALOG_SHOW, {
       dialogId : 'create-palette'
     });
   };
 
   ns.PalettesListController.prototype.onEditPaletteClick_ = function (evt) {
     var paletteId = this.colorPaletteSelect_.value;
-    $.publish(Events.DIALOG_DISPLAY, {
+    $.publish(Events.DIALOG_SHOW, {
       dialogId : 'create-palette',
       initArgs : paletteId
     });

src/js/controller/PenSizeController.js

@@ -1,23 +1,19 @@
 (function () {
   var ns = $.namespace('pskl.controller');
 
-  ns.PenSizeController = function () {};
+  ns.PenSizeController = function () {
+    this.sizePicker = new pskl.widgets.SizePicker(this.onSizePickerChanged_.bind(this));
+  };
 
   ns.PenSizeController.prototype.init = function () {
-    this.container = document.querySelector('.pen-size-container');
-    pskl.utils.Event.addEventListener(this.container, 'click', this.onPenSizeOptionClick_, this);
+    this.sizePicker.init(document.querySelector('.pen-size-container'));
 
     $.subscribe(Events.PEN_SIZE_CHANGED, this.onPenSizeChanged_.bind(this));
-
     this.updateSelectedOption_();
   };
 
-  ns.PenSizeController.prototype.onPenSizeOptionClick_ = function (e) {
-    var size = e.target.dataset.size;
-    if (!isNaN(size)) {
-      size = parseInt(size, 10);
+  ns.PenSizeController.prototype.onSizePickerChanged_ = function (size) {
     pskl.app.penSizeService.setPenSize(size);
-    }
   };
 
   ns.PenSizeController.prototype.onPenSizeChanged_ = function (e) {
@@ -25,19 +21,7 @@
   };
 
   ns.PenSizeController.prototype.updateSelectedOption_ = function () {
-    pskl.utils.Dom.removeClass('labeled', this.container);
-    pskl.utils.Dom.removeClass('selected', this.container);
     var size = pskl.app.penSizeService.getPenSize();
-    var selectedOption;
-    if (size <= 4) {
-      selectedOption = this.container.querySelector('[data-size="' + size + '"]');
-    } else {
-      selectedOption = this.container.querySelector('[data-size="4"]');
-      selectedOption.classList.add('labeled');
-      selectedOption.setAttribute('real-pen-size', size);
-    }
-    if (selectedOption) {
-      selectedOption.classList.add('selected');
-    }
+    this.sizePicker.setSize(size);
   };
 })();

src/js/controller/TransformationsController.js

@@ -1,22 +1,30 @@
 (function () {
   var ns = $.namespace('pskl.controller');
+  var SHOW_MORE_CLASS = 'show-more';
 
   ns.TransformationsController = function () {
     this.tools = [
       new pskl.tools.transform.Flip(),
       new pskl.tools.transform.Rotate(),
       new pskl.tools.transform.Clone(),
-      new pskl.tools.transform.Center()
+      new pskl.tools.transform.Center(),
+      new pskl.tools.transform.Crop(),
     ];
 
     this.toolIconBuilder = new pskl.tools.ToolIconBuilder();
   };
 
   ns.TransformationsController.prototype.init = function () {
-    var container = document.querySelector('.transformations-container');
-    this.toolsContainer = container.querySelector('.tools-wrapper');
-    container.addEventListener('click', this.onTransformationClick_.bind(this));
+    this.container = document.querySelector('.transformations-container');
+    this.container.addEventListener('click', this.onTransformationClick_.bind(this));
+
+    this.showMoreLink = this.container.querySelector('.transformations-show-more-link');
+    this.showMoreLink.addEventListener('click', this.toggleShowMoreTools_.bind(this));
+
     this.createToolsDom_();
+    this.updateShowMoreLink_();
+
+    $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
   };
 
   ns.TransformationsController.prototype.applyTool = function (toolId, evt) {
@@ -30,13 +38,35 @@
 
   ns.TransformationsController.prototype.onTransformationClick_ = function (evt) {
     var toolId = evt.target.dataset.toolId;
+    if (toolId) {
       this.applyTool(toolId, evt);
+    }
+  };
+
+  ns.TransformationsController.prototype.toggleShowMoreTools_ = function (evt) {
+    var showMore = pskl.UserSettings.get(pskl.UserSettings.TRANSFORM_SHOW_MORE);
+    pskl.UserSettings.set(pskl.UserSettings.TRANSFORM_SHOW_MORE, !showMore);
+  };
+
+  ns.TransformationsController.prototype.onUserSettingsChange_ = function (evt, settingName) {
+    if (settingName == pskl.UserSettings.TRANSFORM_SHOW_MORE) {
+      this.updateShowMoreLink_();
+    }
+  };
+
+  ns.TransformationsController.prototype.updateShowMoreLink_ = function () {
+    var showMoreEnabled = pskl.UserSettings.get(pskl.UserSettings.TRANSFORM_SHOW_MORE);
+    this.container.classList.toggle(SHOW_MORE_CLASS, showMoreEnabled);
+
+    // Hide the link in case there are 4 or less tools available.
+    this.showMoreLink.classList.toggle('hidden', this.tools.length < 5);
   };
 
   ns.TransformationsController.prototype.createToolsDom_ = function() {
     var html = this.tools.reduce(function (p, tool) {
       return p + this.toolIconBuilder.createIcon(tool, 'left');
     }.bind(this), '');
-    this.toolsContainer.innerHTML = html;
+    var toolsContainer = this.container.querySelector('.tools-wrapper');
+    toolsContainer.innerHTML = html;
   };
 })();

src/js/controller/UserWarningController.js

@@ -9,7 +9,7 @@
   // This method is not attached to the prototype because we want to trigger it
   // from markup generated for a notification message.
   ns.UserWarningController.showPerformanceInfoDialog = function () {
-    $.publish(Events.DIALOG_DISPLAY, {
+    $.publish(Events.DIALOG_SHOW, {
       dialogId: 'performance-info'
     });
   };
@@ -38,7 +38,11 @@
     var isWarningDisplayed = this.performanceLinkEl.classList.contains('visible');
 
     // Show/hide the performance warning link depending on the received report.
-    this.performanceLinkEl.classList.toggle('visible', shouldDisplayWarning);
+    if (shouldDisplayWarning) {
+      this.performanceLinkEl.classList.add('visible');
+    } else {
+      this.performanceLinkEl.classList.remove('visible');
+    }
 
     // Show a notification message if the new report indicates a performance issue
     // and we were not displaying a warning before.

src/js/controller/dialogs/AbstractDialogController.js

@@ -4,14 +4,19 @@
   ns.AbstractDialogController = function () {};
 
   ns.AbstractDialogController.prototype.init = function () {
-    this.closeButton = document.querySelector('.dialog-close');
-    this.closeButton.addEventListener('click', this.closeDialog.bind(this));
+    var closeButton = document.querySelector('.dialog-close');
+    this.addEventListener(closeButton, 'click', this.closeDialog);
   };
 
-  ns.AbstractDialogController.prototype.destroy = function () {};
+  ns.AbstractDialogController.prototype.addEventListener = function (el, type, cb) {
+    pskl.utils.Event.addEventListener(el, type, cb, this);
+  };
+
+  ns.AbstractDialogController.prototype.destroy = function () {
+    pskl.utils.Event.removeAllEventListeners(this);
+  };
 
   ns.AbstractDialogController.prototype.closeDialog = function () {
-    this.destroy();
     $.publish(Events.DIALOG_HIDE);
   };
 

src/js/controller/dialogs/BrowseLocalController.js

@@ -1,8 +1,7 @@
 (function () {
   var ns = $.namespace('pskl.controller.dialogs');
 
-  ns.BrowseLocalController = function (piskelController) {
-  };
+  ns.BrowseLocalController = function (piskelController) {};
 
   pskl.utils.inherit(ns.BrowseLocalController, ns.AbstractDialogController);
 
@@ -11,7 +10,7 @@
 
     this.localStorageItemTemplate_ = pskl.utils.Template.get('local-storage-item-template');
 
-    this.service_ = pskl.app.localStorageService;
+    this.service_ = pskl.app.indexedDbStorageService;
     this.piskelList = $('.local-piskel-list');
     this.prevSessionContainer = $('.previous-session');
 
@@ -37,9 +36,8 @@
   };
 
   ns.BrowseLocalController.prototype.fillLocalPiskelsList_ = function () {
+    this.service_.getKeys().then(function (keys) {
       var html = '';
-    var keys = this.service_.getKeys();
-
       keys.sort(function (k1, k2) {
         if (k1.date < k2.date) {return 1;}
         if (k1.date > k2.date) {return -1;}
@@ -48,10 +46,14 @@
 
       keys.forEach((function (key) {
         var date = pskl.utils.DateUtils.format(key.date, '{{Y}}/{{M}}/{{D}} {{H}}:{{m}}');
-      html += pskl.utils.Template.replace(this.localStorageItemTemplate_, {name : key.name, date : date});
+        html += pskl.utils.Template.replace(this.localStorageItemTemplate_, {
+          name : key.name,
+          date : date
+        });
       }).bind(this));
 
       var tableBody_ = this.piskelList.get(0).tBodies[0];
       tableBody_.innerHTML = html;
+    }.bind(this));
   };
 })();

src/js/controller/dialogs/CheatsheetController.js

@@ -13,11 +13,12 @@
     this.cheatsheetEl = document.getElementById('cheatsheetContainer');
     this.eventTrapInput = document.getElementById('cheatsheetEventTrap');
 
-    pskl.utils.Event.addEventListener('.cheatsheet-restore-defaults', 'click', this.onRestoreDefaultsClick_, this);
-    pskl.utils.Event.addEventListener(this.cheatsheetEl, 'click', this.onCheatsheetClick_, this);
-    pskl.utils.Event.addEventListener(this.eventTrapInput, 'keydown', this.onEventTrapKeydown_, this);
+    this.addEventListener('.cheatsheet-restore-defaults', 'click', this.onRestoreDefaultsClick_);
+    this.addEventListener(this.cheatsheetEl, 'click', this.onCheatsheetClick_);
+    this.addEventListener(this.eventTrapInput, 'keydown', this.onEventTrapKeydown_);
 
-    $.subscribe(Events.SHORTCUTS_CHANGED, this.onShortcutsChanged_.bind(this));
+    this.onShortcutsChanged_ = this.onShortcutsChanged_.bind(this);
+    $.subscribe(Events.SHORTCUTS_CHANGED, this.onShortcutsChanged_);
 
     this.initMarkup_();
     document.querySelector('.cheatsheet-helptext').setAttribute('title', this.getHelptextTitle_());
@@ -25,8 +26,11 @@
 
   ns.CheatsheetController.prototype.destroy = function () {
     this.eventTrapInput.blur();
-    pskl.utils.Event.removeAllEventListeners();
+
+    $.unsubscribe(Events.SHORTCUTS_CHANGED, this.onShortcutsChanged_);
     this.cheatsheetEl = null;
+
+    this.superclass.destroy.call(this);
   };
 
   ns.CheatsheetController.prototype.onRestoreDefaultsClick_ = function () {
@@ -140,7 +144,8 @@
       title : title,
       icon : descriptor.iconClass,
       description : description,
-      key : this.formatKey_(shortcut.getDisplayKey()),
+      // Avoid sanitization
+      '!key!' : this.formatKey_(shortcut.getDisplayKey()),
       className : shortcutClasses.join(' ')
     });
 
@@ -152,10 +157,10 @@
       key = key.replace('ctrl', 'cmd');
       key = key.replace('alt', 'option');
     }
-    key = key.replace(/left/i, '￩');
-    key = key.replace(/up/i, '￪');
-    key = key.replace(/right/i, '￫');
-    key = key.replace(/down/i, '￬');
+    key = key.replace(/left/i, '←');
+    key = key.replace(/up/i, '↑');
+    key = key.replace(/right/i, '→');
+    key = key.replace(/down/i, '↓');
     key = key.replace(/>/g, '>');
     key = key.replace(/</g, '&lt;');
     // add spaces around '+' delimiters

src/js/controller/dialogs/CreatePaletteController.js

@@ -19,12 +19,12 @@
     var downloadButton = document.querySelector('.create-palette-download-button');
     var importFileButton = document.querySelector('.create-palette-import-button');
 
-    this.nameInput.addEventListener('input', this.onNameInputChange_.bind(this));
-    this.hiddenFileInput.addEventListener('change', this.onFileInputChange_.bind(this));
+    this.addEventListener(this.nameInput, 'input', this.onNameInputChange_);
+    this.addEventListener(this.hiddenFileInput, 'change', this.onFileInputChange_);
 
-    buttonsContainer.addEventListener('click', this.onButtonClick_.bind(this));
-    downloadButton.addEventListener('click', this.onDownloadButtonClick_.bind(this));
-    importFileButton.addEventListener('click', this.onImportFileButtonClick_.bind(this));
+    this.addEventListener(buttonsContainer, 'click', this.onButtonClick_);
+    this.addEventListener(downloadButton, 'click', this.onDownloadButtonClick_);
+    this.addEventListener(importFileButton, 'click', this.onImportFileButtonClick_);
 
     var colorsListContainer = document.querySelector('.colors-container');
     this.colorsListWidget = new pskl.widgets.ColorsList(colorsListContainer);
@@ -66,7 +66,10 @@
 
   ns.CreatePaletteController.prototype.destroy = function () {
     this.colorsListWidget.destroy();
+    this.superclass.destroy.call(this);
+
     this.nameInput = null;
+    this.hiddenFileInput = null;
   };
 
   ns.CreatePaletteController.prototype.onButtonClick_ = function (evt) {

src/js/controller/dialogs/DialogsController.js

@@ -14,9 +14,9 @@
       template : 'templates/dialogs/browse-local.html',
       controller : ns.BrowseLocalController
     },
-    'import-image' : {
-      template : 'templates/dialogs/import-image.html',
-      controller : ns.ImportImageController
+    'import' : {
+      template : 'templates/dialogs/import.html',
+      controller : ns.importwizard.ImportWizard
     },
     'performance-info' : {
       template : 'templates/dialogs/performance-info.html',
@@ -25,6 +25,10 @@
     'unsupported-browser' : {
       template : 'templates/dialogs/unsupported-browser.html',
       controller : ns.UnsupportedBrowserController
+    },
+    'browse-backups' : {
+      template : 'templates/dialogs/browse-backups.html',
+      controller : ns.backups.BrowseBackups
     }
   };
 
@@ -38,7 +42,7 @@
     this.dialogContainer_ = document.getElementById('dialog-container');
     this.dialogWrapper_ = document.getElementById('dialog-container-wrapper');
 
-    $.subscribe(Events.DIALOG_DISPLAY, this.onDialogDisplayEvent_.bind(this));
+    $.subscribe(Events.DIALOG_SHOW, this.onDialogDisplayEvent_.bind(this));
     $.subscribe(Events.DIALOG_HIDE, this.hideDialog.bind(this));
 
     var createPaletteShortcut = pskl.service.keyboard.Shortcuts.COLOR.CREATE_PALETTE;
@@ -51,7 +55,6 @@
     // adding the .animated class here instead of in the markup to avoid an animation during app startup
     this.dialogWrapper_.classList.add('animated');
     pskl.utils.Event.addEventListener(this.dialogWrapper_, 'click', this.onWrapperClicked_, this);
-
   };
 
   ns.DialogsController.prototype.onCreatePaletteShortcut_ = function () {

src/js/controller/dialogs/ImportImageController.js

@@ -1,261 +0,0 @@
-(function () {
-  var ns = $.namespace('pskl.controller.dialogs');
-
-  ns.ImportImageController = function (piskelController) {
-    this.importedImage_ = null;
-    this.file_ = null;
-  };
-
-  pskl.utils.inherit(ns.ImportImageController, ns.AbstractDialogController);
-
-  ns.ImportImageController.prototype.init = function (file) {
-    this.superclass.init.call(this);
-
-    this.file_ = file;
-
-    this.importPreview = $('.import-section-preview');
-
-    this.fileNameContainer = $('.import-image-file-name');
-
-    this.importType = $('[name=import-type]');
-
-    this.resizeWidth = $('[name=resize-width]');
-    this.resizeHeight = $('[name=resize-height]');
-    this.smoothResize =  $('[name=smooth-resize-checkbox]');
-
-    this.frameSizeX = $('[name=frame-size-x]');
-    this.frameSizeY = $('[name=frame-size-y]');
-    this.frameOffsetX = $('[name=frame-offset-x]');
-    this.frameOffsetY = $('[name=frame-offset-y]');
-
-    this.importType.change(this.onImportTypeChange_.bind(this));
-
-    this.resizeWidth.keyup(this.onResizeInputKeyUp_.bind(this, 'width'));
-    this.resizeHeight.keyup(this.onResizeInputKeyUp_.bind(this, 'height'));
-    this.frameSizeX.keyup(this.onFrameInputKeyUp_.bind(this, 'frameSizeX'));
-    this.frameSizeY.keyup(this.onFrameInputKeyUp_.bind(this, 'frameSizeY'));
-    this.frameOffsetX.keyup(this.onFrameInputKeyUp_.bind(this, 'frameOffsetX'));
-    this.frameOffsetY.keyup(this.onFrameInputKeyUp_.bind(this, 'frameOffsetY'));
-
-    this.importImageForm = $('[name=import-image-form]');
-    this.importImageForm.submit(this.onImportFormSubmit_.bind(this));
-
-    pskl.utils.FileUtils.readImageFile(this.file_, this.onImageLoaded_.bind(this));
-  };
-
-  ns.ImportImageController.prototype.onImportTypeChange_ = function (evt) {
-    if (this.getImportType_() === 'single') {
-      // Using single image, so remove the frame grid
-      this.hideFrameGrid_();
-    } else {
-      // Using spritesheet import, so draw the frame grid in the preview
-      var x = this.sanitizeInputValue_(this.frameOffsetX, 0);
-      var y = this.sanitizeInputValue_(this.frameOffsetY, 0);
-      var w = this.sanitizeInputValue_(this.frameSizeX, 1);
-      var h = this.sanitizeInputValue_(this.frameSizeY, 1);
-      this.drawFrameGrid_(x, y, w, h);
-    }
-  };
-
-  ns.ImportImageController.prototype.onImportFormSubmit_ = function (evt) {
-    evt.originalEvent.preventDefault();
-    this.importImageToPiskel_();
-  };
-
-  ns.ImportImageController.prototype.onResizeInputKeyUp_ = function (from, evt) {
-    if (this.importedImage_) {
-      this.synchronizeResizeFields_(evt.target.value, from);
-    }
-  };
-
-  ns.ImportImageController.prototype.onFrameInputKeyUp_ = function (from, evt) {
-    if (this.importedImage_) {
-      this.synchronizeFrameFields_(evt.target.value, from);
-    }
-  };
-
-  ns.ImportImageController.prototype.synchronizeResizeFields_ = function (value, from) {
-    value = parseInt(value, 10);
-    if (isNaN(value)) {
-      value = 0;
-    }
-    var height = this.importedImage_.height;
-    var width = this.importedImage_.width;
-
-    // Select single image import type since the user changed a value here
-    this.importType.filter('[value="single"]').attr('checked', 'checked');
-
-    if (from === 'width') {
-      this.resizeHeight.val(Math.round(value * height / width));
-    } else {
-      this.resizeWidth.val(Math.round(value * width / height));
-    }
-  };
-
-  ns.ImportImageController.prototype.synchronizeFrameFields_ = function (value, from) {
-    value = parseInt(value, 10);
-    if (isNaN(value)) {
-      value = 0;
-    }
-
-    // Parse the frame input values
-    var frameSizeX = this.sanitizeInputValue_(this.frameSizeX, 1);
-    var frameSizeY = this.sanitizeInputValue_(this.frameSizeY, 1);
-    var frameOffsetX = this.sanitizeInputValue_(this.frameOffsetX, 0);
-    var frameOffsetY = this.sanitizeInputValue_(this.frameOffsetY, 0);
-
-    // Select spritesheet import type since the user changed a value here
-    this.importType.filter('[value="sheet"]').attr('checked', 'checked');
-
-    // Draw the grid
-    this.drawFrameGrid_(frameOffsetX, frameOffsetY, frameSizeX, frameSizeY);
-  };
-
-  ns.ImportImageController.prototype.sanitizeInputValue_ = function(input, minValue) {
-    var value = parseInt(input.val(), 10);
-    if (value <= minValue || isNaN(value)) {
-      input.val(minValue);
-      value = minValue;
-    }
-    return value;
-  };
-
-  ns.ImportImageController.prototype.getImportType_ = function () {
-    return this.importType.filter(':checked').val();
-  };
-
-  ns.ImportImageController.prototype.onImageLoaded_ = function (image) {
-    this.importedImage_ = image;
-
-    var w = this.importedImage_.width;
-    var h = this.importedImage_.height;
-
-    // FIXME : We remove the onload callback here because JsGif will insert
-    // the image again and we want to avoid retriggering the image onload
-    this.importedImage_.onload = function () {};
-
-    var fileName = this.extractFileNameFromPath_(this.file_.name);
-    this.fileNameContainer.html(fileName);
-    this.fileNameContainer.attr('title', fileName);
-
-    this.resizeWidth.val(w);
-    this.resizeHeight.val(h);
-
-    this.frameSizeX.val(w);
-    this.frameSizeY.val(h);
-    this.frameOffsetX.val(0);
-    this.frameOffsetY.val(0);
-
-    this.importPreview.width('auto');
-    this.importPreview.height('auto');
-    this.importPreview.html('');
-    this.importPreview.append(this.createImagePreview_());
-  };
-
-  ns.ImportImageController.prototype.createImagePreview_ = function () {
-    var image = document.createElement('IMG');
-    image.src = this.importedImage_.src;
-    return image;
-  };
-
-  ns.ImportImageController.prototype.extractFileNameFromPath_ = function (path) {
-    var parts = [];
-    if (path.indexOf('/') !== -1) {
-      parts = path.split('/');
-    } else if (path.indexOf('\\') !== -1) {
-      parts = path.split('\\');
-    } else {
-      parts = [path];
-    }
-    return parts[parts.length - 1];
-  };
-
-  ns.ImportImageController.prototype.importImageToPiskel_ = function () {
-    if (this.importedImage_) {
-      if (window.confirm('You are about to create a new Piskel, unsaved changes will be lost.')) {
-        pskl.app.importService.newPiskelFromImage(
-          this.importedImage_,
-          {
-            importType: this.getImportType_(),
-            frameSizeX: this.getImportType_() === 'single' ?
-                this.resizeWidth.val() : this.sanitizeInputValue_(this.frameSizeX, 1),
-            frameSizeY: this.getImportType_() === 'single' ?
-                this.resizeHeight.val() : this.sanitizeInputValue_(this.frameSizeY, 1),
-            frameOffsetX: this.sanitizeInputValue_(this.frameOffsetX, 0),
-            frameOffsetY: this.sanitizeInputValue_(this.frameOffsetY, 0),
-            smoothing: !!this.smoothResize.prop('checked')
-          },
-          this.closeDialog.bind(this)
-        );
-      }
-    }
-  };
-
-  ns.ImportImageController.prototype.drawFrameGrid_ = function (frameX, frameY, frameW, frameH) {
-    if (!this.importedImage_) {
-      return;
-    }
-
-    // Grab the sizes of the source and preview images
-    var width = this.importedImage_.width;
-    var height = this.importedImage_.height;
-    var previewWidth = this.importPreview.width();
-    var previewHeight = this.importPreview.height();
-
-    var canvasWrapper = this.importPreview.children('canvas');
-    var canvas = canvasWrapper.get(0);
-    if (!canvasWrapper.length) {
-      // Create a new canvas for the grid
-      canvas = pskl.utils.CanvasUtils.createCanvas(
-        previewWidth + 1,
-        previewHeight + 1);
-      this.importPreview.append(canvas);
-      canvasWrapper = $(canvas);
-    }
-
-    var context = canvas.getContext('2d');
-    context.clearRect(0, 0, canvas.width, canvas.height);
-    context.beginPath();
-
-    // Calculate the number of whole frames
-    var countX = Math.floor((width - frameX) / frameW);
-    var countY = Math.floor((height - frameY) / frameH);
-
-    if (countX > 0 && countY > 0) {
-      var scaleX = previewWidth / width;
-      var scaleY = previewHeight / height;
-      var maxWidth = countX * frameW + frameX;
-      var maxHeight = countY * frameH + frameY;
-
-      // Draw the vertical lines
-      for (var x = frameX + 0.5; x < maxWidth + 1 && x < width + 1; x += frameW) {
-        context.moveTo(x * scaleX, frameY * scaleY);
-        context.lineTo(x * scaleX, maxHeight * scaleY);
-      }
-
-      // Draw the horizontal lines
-      for (var y = frameY + 0.5; y < maxHeight + 1 && y < height + 1; y += frameH) {
-        context.moveTo(frameX * scaleX, y * scaleY);
-        context.lineTo(maxWidth * scaleX, y * scaleY);
-      }
-
-      // Set the line style to dashed
-      context.lineWidth = 1;
-      context.setLineDash([2, 1]);
-      context.strokeStyle = '#000000';
-      context.stroke();
-
-      // Show the canvas
-      canvasWrapper.show();
-      this.importPreview.addClass('no-border');
-    } else {
-      this.hideFrameGrid_();
-    }
-  };
-
-  ns.ImportImageController.prototype.hideFrameGrid_ = function() {
-    this.importPreview.children('canvas').hide();
-    this.importPreview.removeClass('no-border');
-  };
-
-})();

src/js/controller/dialogs/backups/BrowseBackups.js

@@ -0,0 +1,81 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.backups');
+
+  var stepDefinitions = {
+    'SELECT_SESSION' : {
+      controller : ns.steps.SelectSession,
+      template : 'backups-select-session'
+    },
+    'SESSION_DETAILS' : {
+      controller : ns.steps.SessionDetails,
+      template : 'backups-session-details'
+    },
+  };
+
+  ns.BrowseBackups = function (piskelController, args) {
+    this.piskelController = piskelController;
+
+    // Backups data object used by steps to communicate and share their
+    // results.
+    this.backupsData = {
+      sessions: [],
+      selectedSession : null
+    };
+  };
+
+  pskl.utils.inherit(ns.BrowseBackups, pskl.controller.dialogs.AbstractDialogController);
+
+  ns.BrowseBackups.prototype.init = function () {
+    this.superclass.init.call(this);
+
+    // Prepare wizard steps.
+    this.steps = this.createSteps_();
+
+    // Start wizard widget.
+    var wizardContainer = document.querySelector('.backups-wizard-container');
+    this.wizard = new pskl.widgets.Wizard(this.steps, wizardContainer);
+    this.wizard.init();
+
+    this.wizard.goTo('SELECT_SESSION');
+  };
+
+  ns.BrowseBackups.prototype.back = function () {
+    this.wizard.back();
+    this.wizard.getCurrentStep().instance.onShow();
+  };
+
+  ns.BrowseBackups.prototype.next = function () {
+    var step = this.wizard.getCurrentStep();
+    if (step.name === 'SELECT_SESSION') {
+      this.wizard.goTo('SESSION_DETAILS');
+    }
+  };
+
+  ns.BrowseBackups.prototype.destroy = function (file) {
+    Object.keys(this.steps).forEach(function (stepName) {
+      var step = this.steps[stepName];
+      step.instance.destroy();
+      step.instance = null;
+      step.el = null;
+    }.bind(this));
+
+    this.superclass.destroy.call(this);
+  };
+
+  ns.BrowseBackups.prototype.createSteps_ = function () {
+    var steps = {};
+    Object.keys(stepDefinitions).forEach(function (stepName) {
+      var definition = stepDefinitions[stepName];
+      var el = pskl.utils.Template.getAsHTML(definition.template);
+      var instance = new definition.controller(this.piskelController, this, el);
+      instance.init();
+      steps[stepName] = {
+        name: stepName,
+        el: el,
+        instance: instance
+      };
+    }.bind(this));
+
+    return steps;
+  };
+})();

src/js/controller/dialogs/backups/steps/SelectSession.js

@@ -0,0 +1,101 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.backups.steps');
+
+  // Should match the transition duration for.session-item defined in dialogs-browse-backups.css
+  var DELETE_TRANSITION_DURATION = 500;
+  /**
+   * Helper that returns a promise that will resolve after waiting for a
+   * given time (in ms).
+   *
+   * @param {Number} time
+   *        The time to wait.
+   * @return {Promise} promise that resolves after time.
+   */
+  var wait = function (time) {
+    var deferred = Q.defer();
+    setTimeout(function () {
+      deferred.resolve();
+    }, time);
+    return deferred.promise;
+  };
+
+  ns.SelectSession = function (piskelController, backupsController, container) {
+    this.piskelController = piskelController;
+    this.backupsController = backupsController;
+    this.container = container;
+  };
+
+  ns.SelectSession.prototype.addEventListener = function (el, type, cb) {
+    pskl.utils.Event.addEventListener(el, type, cb, this);
+  };
+
+  ns.SelectSession.prototype.init = function () {
+    this.addEventListener(this.container, 'click', this.onContainerClick_);
+  };
+
+  ns.SelectSession.prototype.onShow = function () {
+    this.update();
+  };
+
+  ns.SelectSession.prototype.update = function () {
+    pskl.app.backupService.list().then(function (sessions) {
+      var html = this.getMarkupForSessions_(sessions);
+      this.container.querySelector('.session-list').innerHTML = html;
+    }.bind(this)).catch(function () {
+      var html = pskl.utils.Template.get('session-list-error');
+      this.container.querySelector('.session-list').innerHTML = html;
+    }.bind(this));
+  };
+
+  ns.SelectSession.prototype.getMarkupForSessions_ = function (sessions) {
+    if (sessions.length === 0) {
+      return pskl.utils.Template.get('session-list-empty');
+    }
+
+    var sessionItemTemplate = pskl.utils.Template.get('session-list-item');
+    return sessions.reduce(function (previous, session) {
+      if (session.id === pskl.app.sessionId) {
+        // Do not show backups for the current session.
+        return previous;
+      }
+      var view = {
+        id: session.id,
+        name: session.name,
+        description: session.description ? '- ' + session.description : '',
+        date: pskl.utils.DateUtils.format(session.endDate, 'the {{Y}}/{{M}}/{{D}} at {{H}}:{{m}}'),
+        count: session.count === 1 ? '1 snapshot' : session.count + ' snapshots'
+      };
+      return previous + pskl.utils.Template.replace(sessionItemTemplate, view);
+    }, '');
+  };
+
+  ns.SelectSession.prototype.destroy = function () {
+    pskl.utils.Event.removeAllEventListeners(this);
+  };
+
+  ns.SelectSession.prototype.onContainerClick_ = function (evt) {
+    var sessionId = evt.target.dataset.sessionId;
+    if (!sessionId) {
+      return;
+    }
+
+    var action = evt.target.dataset.action;
+    if (action == 'view') {
+      this.backupsController.backupsData.selectedSession = sessionId;
+      this.backupsController.next();
+    } else if (action == 'delete') {
+      if (window.confirm('Are you sure you want to delete this session?')) {
+        evt.target.closest('.session-item').classList.add('deleting');
+        Q.all([
+          pskl.app.backupService.deleteSession(sessionId),
+          // Wait for 500ms for the .hide opacity transition.
+          wait(DELETE_TRANSITION_DURATION)
+        ]).then(function () {
+          // Refresh the list of sessions
+          this.update();
+        }.bind(this));
+      }
+    }
+  };
+
+})();

src/js/controller/dialogs/backups/steps/SessionDetails.js

@@ -0,0 +1,102 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.backups.steps');
+
+  // Should match the preview dimensions defined in dialogs-browse-backups.css
+  var PREVIEW_SIZE = 60;
+
+  ns.SessionDetails = function (piskelController, backupsController, container) {
+    this.piskelController = piskelController;
+    this.backupsController = backupsController;
+    this.container = container;
+  };
+
+  ns.SessionDetails.prototype.init = function () {
+    this.backButton = this.container.querySelector('.back-button');
+    this.addEventListener(this.backButton, 'click', this.onBackClick_);
+    this.addEventListener(this.container, 'click', this.onContainerClick_);
+  };
+
+  ns.SessionDetails.prototype.destroy = function () {
+    pskl.utils.Event.removeAllEventListeners(this);
+  };
+
+  ns.SessionDetails.prototype.addEventListener = function (el, type, cb) {
+    pskl.utils.Event.addEventListener(el, type, cb, this);
+  };
+
+  ns.SessionDetails.prototype.onShow = function () {
+    var sessionId = this.backupsController.backupsData.selectedSession;
+    pskl.app.backupService.getSnapshotsBySessionId(sessionId).then(function (snapshots) {
+      var html = this.getMarkupForSnapshots_(snapshots);
+      this.container.querySelector('.snapshot-list').innerHTML = html;
+
+      // Load the image of the first frame for each sprite and update the list.
+      snapshots.forEach(function (snapshot) {
+        this.updateSnapshotPreview_(snapshot);
+      }.bind(this));
+    }.bind(this)).catch(function () {
+      var html = pskl.utils.Template.get('snapshot-list-error');
+      this.container.querySelector('.snapshot-list').innerHTML = html;
+    }.bind(this));
+  };
+
+  ns.SessionDetails.prototype.getMarkupForSnapshots_ = function (snapshots) {
+    if (snapshots.length === 0) {
+      // This should normally never happen, all sessions have at least one snapshot and snapshots
+      // can not be individually deleted.
+      console.warn('Could not retrieve snapshots for a session');
+      return pskl.utils.Template.get('snapshot-list-empty');
+    }
+
+    var sessionItemTemplate = pskl.utils.Template.get('snapshot-list-item');
+    return snapshots.reduce(function (previous, snapshot) {
+      var view = {
+        id: snapshot.id,
+        name: snapshot.name,
+        description: snapshot.description ? '- ' + snapshot.description : '',
+        date: pskl.utils.DateUtils.format(snapshot.date, 'the {{Y}}/{{M}}/{{D}} at {{H}}:{{m}}'),
+        frames: snapshot.frames === 1 ? '1 frame' : snapshot.frames + ' frames',
+        resolution: pskl.utils.StringUtils.formatSize(snapshot.width, snapshot.height),
+        fps: snapshot.fps
+      };
+      return previous + pskl.utils.Template.replace(sessionItemTemplate, view);
+    }, '');
+  };
+
+  ns.SessionDetails.prototype.updateSnapshotPreview_ = function (snapshot) {
+    pskl.utils.serialization.Deserializer.deserialize(
+      JSON.parse(snapshot.serialized),
+      function (piskel) {
+        var selector = '.snapshot-item[data-snapshot-id="' + snapshot.id + '"] .snapshot-preview';
+        var previewContainer = this.container.querySelector(selector);
+        if (!previewContainer) {
+          return;
+        }
+        var image = this.getFirstFrameAsImage_(piskel);
+        previewContainer.appendChild(image);
+      }.bind(this)
+    );
+  };
+
+  ns.SessionDetails.prototype.getFirstFrameAsImage_ = function (piskel) {
+    var frame = pskl.utils.LayerUtils.mergeFrameAt(piskel.getLayers(), 0);
+    var wZoom = PREVIEW_SIZE / piskel.width;
+    var hZoom = PREVIEW_SIZE / piskel.height;
+    var zoom = Math.min(hZoom, wZoom);
+    return pskl.utils.FrameUtils.toImage(frame, zoom);
+  };
+
+  ns.SessionDetails.prototype.onBackClick_ = function () {
+    this.backupsController.back(this);
+  };
+
+  ns.SessionDetails.prototype.onContainerClick_ = function (evt) {
+    var action = evt.target.dataset.action;
+    if (action == 'load' && window.confirm(Constants.CONFIRM_OVERWRITE)) {
+      var snapshotId = evt.target.dataset.snapshotId * 1;
+      pskl.app.backupService.loadSnapshotById(snapshotId).then(function () {
+        $.publish(Events.DIALOG_HIDE);
+      });
+    }
+  };
+})();

src/js/controller/dialogs/importwizard/ImportWizard.js

@@ -0,0 +1,202 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.importwizard');
+
+  var stepDefinitions = {
+    'IMAGE_IMPORT' : {
+      controller : ns.steps.ImageImport,
+      template : 'import-image-import'
+    },
+    'ADJUST_SIZE' : {
+      controller : ns.steps.AdjustSize,
+      template : 'import-adjust-size'
+    },
+    'INSERT_LOCATION' : {
+      controller : ns.steps.InsertLocation,
+      template : 'import-insert-location'
+    },
+    'SELECT_MODE' : {
+      controller : ns.steps.SelectMode,
+      template : 'import-select-mode'
+    }
+  };
+
+  ns.ImportWizard = function (piskelController, args) {
+    this.piskelController = piskelController;
+
+    // Merge data object used by steps to communicate and share their
+    // results.
+    this.mergeData = {
+      rawFiles : [],
+      mergePiskel: null,
+      origin: null,
+      resize: null,
+      insertIndex: null,
+      insertMode: null
+    };
+  };
+
+  pskl.utils.inherit(ns.ImportWizard, pskl.controller.dialogs.AbstractDialogController);
+
+  ns.ImportWizard.prototype.init = function (initArgs) {
+    this.superclass.init.call(this);
+
+    // Prepare mergeData  object and wizard steps.
+    this.mergeData.rawFiles = initArgs.rawFiles;
+    this.steps = this.createSteps_();
+
+    // Start wizard widget.
+    var wizardContainer = document.querySelector('.import-wizard-container');
+    this.wizard = new pskl.widgets.Wizard(this.steps, wizardContainer);
+    this.wizard.init();
+
+    if (this.hasSingleImage_()) {
+      this.wizard.goTo('IMAGE_IMPORT');
+    } else if (this.hasSinglePiskelFile_()) {
+      // If a piskel file was provided we can directly go to
+      pskl.utils.PiskelFileUtils.loadFromFile(this.mergeData.rawFiles[0],
+        // onSuccess
+        function (piskel) {
+          this.mergeData.mergePiskel = piskel;
+          this.wizard.goTo('SELECT_MODE');
+        }.bind(this),
+        // onError
+        function (reason) {
+          this.closeDialog();
+          $.publish(Events.PISKEL_FILE_IMPORT_FAILED, [reason]);
+        }.bind(this)
+      );
+    } else {
+      console.error('Unsupported import. Only single piskel or single image are supported at the moment.');
+      this.closeDialog();
+    }
+  };
+
+  ns.ImportWizard.prototype.back = function () {
+    this.wizard.back();
+    this.wizard.getCurrentStep().instance.onShow();
+  };
+
+  ns.ImportWizard.prototype.next = function () {
+    var step = this.wizard.getCurrentStep();
+
+    if (step.name === 'IMAGE_IMPORT') {
+      if (this.piskelController.isEmpty()) {
+        // If the current sprite is empty finalize immediately and replace the current sprite.
+        this.mergeData.importMode = ns.steps.SelectMode.MODES.REPLACE;
+        this.finalizeImport_();
+      } else {
+        this.wizard.goTo('SELECT_MODE');
+      }
+    } else if (step.name === 'SELECT_MODE') {
+      if (this.mergeData.importMode === ns.steps.SelectMode.MODES.REPLACE) {
+        this.finalizeImport_();
+      } else if (this.hasSameSize_()) {
+        this.wizard.goTo('INSERT_LOCATION');
+      } else {
+        this.wizard.goTo('ADJUST_SIZE');
+      }
+    } else if (step.name === 'ADJUST_SIZE') {
+      this.wizard.goTo('INSERT_LOCATION');
+    } else if (step.name === 'INSERT_LOCATION') {
+      this.finalizeImport_();
+    }
+  };
+
+  ns.ImportWizard.prototype.destroy = function (file) {
+    Object.keys(this.steps).forEach(function (stepName) {
+      var step = this.steps[stepName];
+      step.instance.destroy();
+      step.instance = null;
+      step.el = null;
+    }.bind(this));
+
+    this.superclass.destroy.call(this);
+  };
+
+  ns.ImportWizard.prototype.createSteps_ = function () {
+    // The IMAGE_IMPORT step is used only if there is a single image file
+    // being imported.
+    var hasSingleImage = this.hasSingleImage_();
+
+    var steps = {};
+    Object.keys(stepDefinitions).forEach(function (stepName) {
+      if (stepName === 'IMAGE_IMPORT' && !hasSingleImage) {
+        return;
+      }
+
+      var definition = stepDefinitions[stepName];
+      var el = pskl.utils.Template.getAsHTML(definition.template);
+      var instance = new definition.controller(this.piskelController, this, el);
+      instance.init();
+      steps[stepName] = {
+        name: stepName,
+        el: el,
+        instance: instance
+      };
+    }.bind(this));
+
+    if (hasSingleImage) {
+      steps.IMAGE_IMPORT.el.classList.add('import-first-step');
+    } else {
+      steps.SELECT_MODE.el.classList.add('import-first-step');
+    }
+
+    return steps;
+  };
+
+  ns.ImportWizard.prototype.finalizeImport_ = function () {
+    var piskel = this.mergeData.mergePiskel;
+    var mode = this.mergeData.importMode;
+
+    if (mode === ns.steps.SelectMode.MODES.REPLACE) {
+      // Replace the current piskel and close the dialog.
+      if (window.confirm(Constants.CONFIRM_OVERWRITE)) {
+        this.piskelController.setPiskel(piskel);
+        this.closeDialog();
+      }
+    } else if (mode === ns.steps.SelectMode.MODES.MERGE) {
+      var merge = pskl.utils.MergeUtils.merge(this.piskelController.getPiskel(), piskel, {
+        insertIndex: this.mergeData.insertIndex,
+        insertMode: this.mergeData.insertMode,
+        origin: this.mergeData.origin,
+        resize: this.mergeData.resize
+      });
+      this.piskelController.setPiskel(merge);
+
+      // Set the first imported layer as selected.
+      var importedLayers = piskel.getLayers().length;
+      var currentLayers = this.piskelController.getLayers().length;
+      this.piskelController.setCurrentLayerIndex(currentLayers - importedLayers);
+
+      this.closeDialog();
+    }
+  };
+
+  ns.ImportWizard.prototype.hasSameSize_ = function () {
+    var piskel = this.mergeData.mergePiskel;
+    if (!piskel) {
+      return false;
+    }
+
+    return piskel.width === this.piskelController.getWidth() &&
+           piskel.height === this.piskelController.getHeight();
+  };
+
+  ns.ImportWizard.prototype.hasSingleImage_ = function () {
+    if (this.mergeData.rawFiles.length !== 1) {
+      return false;
+    }
+
+    var file = this.mergeData.rawFiles[0];
+    return file.type.indexOf('image') === 0;
+  };
+
+  ns.ImportWizard.prototype.hasSinglePiskelFile_ = function () {
+    if (this.mergeData.rawFiles.length !== 1) {
+      return false;
+    }
+
+    var file = this.mergeData.rawFiles[0];
+    return (/\.piskel$/).test(file.name);
+  };
+})();

src/js/controller/dialogs/importwizard/steps/AbstractImportStep.js

@@ -0,0 +1,65 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.importwizard.steps');
+
+  ns.AbstractImportStep = function (piskelController, importController, container) {
+    this.piskelController = piskelController;
+    this.container = container;
+    this.importController = importController;
+    this.mergeData = this.importController.mergeData;
+  };
+
+  ns.AbstractImportStep.prototype.init = function () {
+    this.nextButton = this.container.querySelector('.import-next-button');
+    this.backButton = this.container.querySelector('.import-back-button');
+
+    this.addEventListener(this.nextButton, 'click', this.onNextClick);
+    this.addEventListener(this.backButton, 'click', this.onBackClick);
+  };
+
+  ns.AbstractImportStep.prototype.addEventListener = function (el, type, cb) {
+    pskl.utils.Event.addEventListener(el, type, cb, this);
+  };
+
+  ns.AbstractImportStep.prototype.destroy = function () {
+    if (this.framePickerWidget) {
+      this.framePickerWidget.destroy();
+    }
+
+    pskl.utils.Event.removeAllEventListeners(this);
+  };
+
+  ns.AbstractImportStep.prototype.onNextClick = function () {
+    this.importController.next(this);
+  };
+
+  ns.AbstractImportStep.prototype.onBackClick = function () {
+    this.importController.back(this);
+  };
+
+  ns.AbstractImportStep.prototype.onShow = function () {
+    var mergePiskel = this.mergeData.mergePiskel;
+    if (!mergePiskel) {
+      return;
+    }
+
+    if (!this.framePickerWidget) {
+      var framePickerContainer = this.container.querySelector('.import-preview');
+      this.framePickerWidget = new pskl.widgets.FramePicker(mergePiskel, framePickerContainer);
+      this.framePickerWidget.init();
+    } else if (this.framePickerWidget.piskel != mergePiskel) {
+      // If the piskel displayed by the frame picker is different from the previous one,
+      // refresh the widget.
+      this.framePickerWidget.piskel = mergePiskel;
+      this.framePickerWidget.setFrameIndex(1);
+    }
+
+    var metaHtml = pskl.utils.Template.getAndReplace('import-meta-content', {
+      name : mergePiskel.getDescriptor().name,
+      dimensions : pskl.utils.StringUtils.formatSize(mergePiskel.getWidth(), mergePiskel.getHeight()),
+      frames : mergePiskel.getFrameCount(),
+      layers : mergePiskel.getLayers().length
+    });
+    this.container.querySelector('.import-meta').innerHTML = metaHtml;
+  };
+
+})();

src/js/controller/dialogs/importwizard/steps/AdjustSize.js

@@ -0,0 +1,109 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.importwizard.steps');
+
+  ns.AdjustSize = function (piskelController, importController, container) {
+    this.superclass.constructor.apply(this, arguments);
+  };
+
+  ns.AdjustSize.OPTIONS = {
+    KEEP: 'keep',
+    EXPAND: 'expand'
+  };
+
+  pskl.utils.inherit(ns.AdjustSize, ns.AbstractImportStep);
+
+  ns.AdjustSize.prototype.init = function () {
+    this.superclass.init.call(this);
+
+    // Create anchor widget
+    var anchorContainer = this.container.querySelector('.import-resize-anchor-container');
+    this.anchorWidget = new pskl.widgets.AnchorWidget(anchorContainer, this.onAnchorChange_.bind(this));
+    this.anchorWidget.setOrigin('TOPLEFT');
+
+    this.resizeInfoContainer = this.container.querySelector('.import-resize-info');
+    this.addEventListener(this.resizeInfoContainer, 'change', this.onResizeOptionChange_);
+
+    // By default, set the mode to expand to avoid losing any image content.
+    this.mergeData.resize = ns.AdjustSize.OPTIONS.EXPAND;
+  };
+
+  ns.AdjustSize.prototype.destroy = function () {
+    this.anchorWidget.destroy();
+    this.superclass.destroy.call(this);
+  };
+
+  ns.AdjustSize.prototype.onShow = function () {
+    this.refresh_();
+    this.superclass.onShow.call(this);
+  };
+
+  ns.AdjustSize.prototype.refresh_ = function () {
+    var isBigger = this.isImportedPiskelBigger_();
+    var keep = this.mergeData.resize === ns.AdjustSize.OPTIONS.KEEP;
+
+    // Refresh resize partial
+    var size = this.formatPiskelSize_(this.piskelController.getPiskel());
+    var newSize = this.formatPiskelSize_(this.mergeData.mergePiskel);
+    var markup;
+    if (isBigger) {
+      markup = pskl.utils.Template.getAndReplace('import-resize-bigger-partial', {
+        size : size,
+        newSize : newSize,
+        keepChecked : keep ? 'checked="checked"' : '',
+        expandChecked : keep ? '' : 'checked="checked"'
+      });
+    } else {
+      markup = pskl.utils.Template.getAndReplace('import-resize-smaller-partial', {
+        size : size,
+        newSize : newSize
+      });
+    }
+    this.resizeInfoContainer.innerHTML = markup;
+
+    // Update anchor widget
+    if (this.mergeData.origin) {
+      this.anchorWidget.setOrigin(this.mergeData.origin);
+    }
+
+    // Update anchor widget info
+    var anchorInfo = this.container.querySelector('.import-resize-anchor-info');
+    if (isBigger && keep) {
+      anchorInfo.innerHTML = [
+        '<div class="import-resize-warning">',
+        '  Imported content will be cropped!',
+        '</div>',
+        'Select crop anchor:'
+      ].join('');
+    } else if (isBigger) {
+      anchorInfo.innerHTML = 'Select resize anchor:';
+    } else {
+      anchorInfo.innerHTML = 'Select position anchor:';
+    }
+  };
+
+  ns.AdjustSize.prototype.onAnchorChange_ = function (origin) {
+    this.mergeData.origin = origin;
+  };
+
+  ns.AdjustSize.prototype.onResizeOptionChange_ = function () {
+    var value = this.resizeInfoContainer.querySelector(':checked').value;
+    if (this.mergeData.resize != value) {
+      this.mergeData.resize = value;
+      this.refresh_();
+    }
+  };
+
+  ns.AdjustSize.prototype.isImportedPiskelBigger_ = function () {
+    var piskel = this.mergeData.mergePiskel;
+    if (!piskel) {
+      return false;
+    }
+
+    return piskel.width > this.piskelController.getWidth() ||
+           piskel.height > this.piskelController.getHeight();
+  };
+
+  ns.AdjustSize.prototype.formatPiskelSize_ = function (piskel) {
+    return pskl.utils.StringUtils.formatSize(piskel.width, piskel.height);
+  };
+})();

src/js/controller/dialogs/importwizard/steps/ImageImport.js

@@ -0,0 +1,282 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.importwizard.steps');
+
+  ns.ImageImport = function (piskelController, importController, container) {
+    this.superclass.constructor.apply(this, arguments);
+    this.importedImage_ = null;
+    this.file_ = null;
+  };
+
+  pskl.utils.inherit(ns.ImageImport, ns.AbstractImportStep);
+
+  ns.ImageImport.prototype.init = function (file) {
+    this.superclass.init.call(this);
+
+    // This step is only used if rawFiles contains a single image.
+    this.file_ = this.mergeData.rawFiles[0];
+
+    this.importPreview = this.container.querySelector('.import-section-preview');
+
+    this.fileNameContainer = this.container.querySelector('.import-image-file-name');
+
+    this.singleImportType = this.container.querySelector('[name=import-type][value=single]');
+    this.sheetImportType = this.container.querySelector('[name=import-type][value=sheet]');
+
+    this.resizeWidth = this.container.querySelector('[name=resize-width]');
+    this.resizeHeight = this.container.querySelector('[name=resize-height]');
+    this.smoothResize =  this.container.querySelector('[name=smooth-resize-checkbox]');
+
+    this.frameSizeX = this.container.querySelector('[name=frame-size-x]');
+    this.frameSizeY = this.container.querySelector('[name=frame-size-y]');
+    this.frameOffsetX = this.container.querySelector('[name=frame-offset-x]');
+    this.frameOffsetY = this.container.querySelector('[name=frame-offset-y]');
+
+    this.addEventListener(this.singleImportType, 'change', this.onImportTypeChange_);
+    this.addEventListener(this.sheetImportType, 'change', this.onImportTypeChange_);
+
+    this.addEventListener(this.resizeWidth, 'keyup', this.onResizeInputKeyUp_);
+    this.addEventListener(this.resizeHeight, 'keyup', this.onResizeInputKeyUp_);
+    this.addEventListener(this.frameSizeX, 'keyup', this.onFrameInputKeyUp_);
+    this.addEventListener(this.frameSizeY, 'keyup', this.onFrameInputKeyUp_);
+    this.addEventListener(this.frameOffsetX, 'keyup', this.onFrameInputKeyUp_);
+    this.addEventListener(this.frameOffsetY, 'keyup', this.onFrameInputKeyUp_);
+
+    pskl.utils.FileUtils.readImageFile(this.file_, this.onImageLoaded_.bind(this));
+
+    if (this.piskelController.isEmpty()) {
+      this.nextButton.textContent = 'import';
+    }
+  };
+
+  ns.ImageImport.prototype.onNextClick = function () {
+    this.container.classList.add('import-image-loading');
+    this.createPiskelFromImage().then(function (piskel) {
+      this.mergeData.mergePiskel = piskel;
+      this.container.classList.remove('import-image-loading');
+      this.superclass.onNextClick.call(this);
+    }.bind(this)).catch(function (e) {
+      console.error(e);
+    });
+  };
+
+  ns.ImageImport.prototype.onShow = function () {
+    this.container.classList.remove('import-image-loading');
+  };
+
+  ns.ImageImport.prototype.createPiskelFromImage = function () {
+    var name = this.extractFileNameFromPath_(this.file_.name);
+    // Remove extension from filename.
+    name = name.replace(/\.[a-zA-Z]+$/, '');
+
+    var deferred = Q.defer();
+    pskl.app.importService.newPiskelFromImage(
+      this.importedImage_,
+      {
+        importType: this.getImportType_(),
+        frameSizeX: this.getImportType_() === 'single' ?
+            this.resizeWidth.value : this.sanitizeInputValue_(this.frameSizeX, 1),
+        frameSizeY: this.getImportType_() === 'single' ?
+            this.resizeHeight.value : this.sanitizeInputValue_(this.frameSizeY, 1),
+        frameOffsetX: this.sanitizeInputValue_(this.frameOffsetX, 0),
+        frameOffsetY: this.sanitizeInputValue_(this.frameOffsetY, 0),
+        smoothing: !!this.smoothResize.checked,
+        name: name
+      },
+      deferred.resolve
+    );
+    return deferred.promise;
+  };
+
+  ns.ImageImport.prototype.onImportTypeChange_ = function (evt) {
+    if (this.getImportType_() === 'single') {
+      // Using single image, so remove the frame grid
+      this.hideFrameGrid_();
+    } else {
+      // Using spritesheet import, so draw the frame grid in the preview
+      var x = this.sanitizeInputValue_(this.frameOffsetX, 0);
+      var y = this.sanitizeInputValue_(this.frameOffsetY, 0);
+      var w = this.sanitizeInputValue_(this.frameSizeX, 1);
+      var h = this.sanitizeInputValue_(this.frameSizeY, 1);
+      this.drawFrameGrid_(x, y, w, h);
+    }
+  };
+
+  ns.ImageImport.prototype.onResizeInputKeyUp_ = function (evt) {
+    var from = evt.target.getAttribute('name');
+    if (this.importedImage_) {
+      this.synchronizeResizeFields_(evt.target.value, from);
+    }
+  };
+
+  ns.ImageImport.prototype.onFrameInputKeyUp_ = function (evt) {
+    if (this.importedImage_) {
+      this.synchronizeFrameFields_(evt.target.value);
+    }
+  };
+
+  ns.ImageImport.prototype.synchronizeResizeFields_ = function (value, from) {
+    value = parseInt(value, 10);
+    if (isNaN(value)) {
+      value = 0;
+    }
+    var height = this.importedImage_.height;
+    var width = this.importedImage_.width;
+
+    // Select single image import type since the user changed a value here
+    this.singleImportType.checked = true;
+
+    if (from === 'resize-width') {
+      this.resizeHeight.value = Math.round(value * height / width);
+    } else {
+      this.resizeWidth.value = Math.round(value * width / height);
+    }
+  };
+
+  ns.ImageImport.prototype.synchronizeFrameFields_ = function (value) {
+    value = parseInt(value, 10);
+    if (isNaN(value)) {
+      value = 0;
+    }
+
+    // Parse the frame input values
+    var frameSizeX = this.sanitizeInputValue_(this.frameSizeX, 1);
+    var frameSizeY = this.sanitizeInputValue_(this.frameSizeY, 1);
+    var frameOffsetX = this.sanitizeInputValue_(this.frameOffsetX, 0);
+    var frameOffsetY = this.sanitizeInputValue_(this.frameOffsetY, 0);
+
+    // Select spritesheet import type since the user changed a value here
+    this.sheetImportType.checked = true;
+
+    // Draw the grid
+    this.drawFrameGrid_(frameOffsetX, frameOffsetY, frameSizeX, frameSizeY);
+  };
+
+  ns.ImageImport.prototype.sanitizeInputValue_ = function(input, minValue) {
+    var value = parseInt(input.value, 10);
+    if (value <= minValue || isNaN(value)) {
+      input.value = minValue;
+      value = minValue;
+    }
+    return value;
+  };
+
+  ns.ImageImport.prototype.getImportType_ = function () {
+    if (this.singleImportType.checked) {
+      return this.singleImportType.value;
+    } else if (this.sheetImportType.checked) {
+      return this.sheetImportType.value;
+    } else {
+      throw 'Could not find the currently selected import type';
+    }
+  };
+
+  ns.ImageImport.prototype.onImageLoaded_ = function (image) {
+    this.importedImage_ = image;
+
+    var w = this.importedImage_.width;
+    var h = this.importedImage_.height;
+
+    // FIXME : We remove the onload callback here because JsGif will insert
+    // the image again and we want to avoid retriggering the image onload
+    this.importedImage_.onload = function () {};
+
+    var fileName = this.extractFileNameFromPath_(this.file_.name);
+    this.fileNameContainer.textContent = fileName;
+    this.fileNameContainer.setAttribute('title', fileName);
+
+    this.resizeWidth.value = w;
+    this.resizeHeight.value = h;
+
+    this.frameSizeX.value = w;
+    this.frameSizeY.value = h;
+    this.frameOffsetX.value = 0;
+    this.frameOffsetY.value = 0;
+
+    this.importPreview.innerHTML = '';
+    this.importPreview.appendChild(this.createImagePreview_());
+  };
+
+  ns.ImageImport.prototype.createImagePreview_ = function () {
+    var image = document.createElement('IMG');
+    image.src = this.importedImage_.src;
+    return image;
+  };
+
+  ns.ImageImport.prototype.extractFileNameFromPath_ = function (path) {
+    var parts = [];
+    if (path.indexOf('/') !== -1) {
+      parts = path.split('/');
+    } else if (path.indexOf('\\') !== -1) {
+      parts = path.split('\\');
+    } else {
+      parts = [path];
+    }
+    return parts[parts.length - 1];
+  };
+
+  ns.ImageImport.prototype.drawFrameGrid_ = function (frameX, frameY, frameW, frameH) {
+    if (!this.importedImage_) {
+      return;
+    }
+
+    // Grab the sizes of the source and preview images
+    var width = this.importedImage_.width;
+    var height = this.importedImage_.height;
+
+    var image = this.importPreview.querySelector('img');
+    var previewWidth = image.offsetWidth;
+    var previewHeight = image.offsetHeight;
+
+    var canvas = this.importPreview.querySelector('canvas');
+    if (!canvas) {
+      // Create a new canvas for the grid
+      canvas = pskl.utils.CanvasUtils.createCanvas(
+        previewWidth + 1,
+        previewHeight + 1);
+      this.importPreview.appendChild(canvas);
+    }
+
+    var context = canvas.getContext('2d');
+    context.clearRect(0, 0, canvas.width, canvas.height);
+    context.beginPath();
+
+    // Calculate the number of whole frames
+    var countX = Math.floor((width - frameX) / frameW);
+    var countY = Math.floor((height - frameY) / frameH);
+
+    if (countX > 0 && countY > 0) {
+      var scaleX = previewWidth / width;
+      var scaleY = previewHeight / height;
+      var maxWidth = countX * frameW + frameX;
+      var maxHeight = countY * frameH + frameY;
+
+      // Draw the vertical lines
+      for (var x = frameX + 0.5; x < maxWidth + 1 && x < width + 1; x += frameW) {
+        context.moveTo(x * scaleX, frameY * scaleY);
+        context.lineTo(x * scaleX, maxHeight * scaleY);
+      }
+
+      // Draw the horizontal lines
+      for (var y = frameY + 0.5; y < maxHeight + 1 && y < height + 1; y += frameH) {
+        context.moveTo(frameX * scaleX, y * scaleY);
+        context.lineTo(maxWidth * scaleX, y * scaleY);
+      }
+
+      context.lineWidth = 1;
+      context.strokeStyle = 'gold';
+      context.stroke();
+
+      // Show the canvas
+      canvas.style.display = 'block';
+    } else {
+      this.hideFrameGrid_();
+    }
+  };
+
+  ns.ImageImport.prototype.hideFrameGrid_ = function() {
+    var canvas = this.importPreview.querySelector('canvas');
+    if (canvas) {
+      canvas.style.display = 'none';
+    }
+  };
+})();

src/js/controller/dialogs/importwizard/steps/InsertLocation.js

@@ -0,0 +1,59 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.importwizard.steps');
+
+  ns.InsertLocation = function () {
+    this.superclass.constructor.apply(this, arguments);
+  };
+
+  ns.InsertLocation.MODES = {
+    ADD : 'add',
+    INSERT : 'insert'
+  };
+
+  pskl.utils.inherit(ns.InsertLocation, ns.AbstractImportStep);
+
+  ns.InsertLocation.prototype.init = function () {
+    this.superclass.init.call(this);
+    this.framePreview = this.container.querySelector('.insert-frame-preview');
+    this.currentPiskelFramePickerWidget = new pskl.widgets.FramePicker(
+      this.piskelController.getPiskel(), this.framePreview);
+
+    this.insertModeContainer = this.container.querySelector('.insert-mode-container');
+    this.addEventListener(this.insertModeContainer, 'change', this.onInsertModeChange_);
+    this.mergeData.insertMode = ns.InsertLocation.MODES.ADD;
+  };
+
+  ns.InsertLocation.prototype.onInsertModeChange_  = function () {
+    var value = this.insertModeContainer.querySelector(':checked').value;
+    this.mergeData.insertMode = value;
+
+    if (this.mergeData.insertMode === ns.InsertLocation.MODES.ADD) {
+      this.currentPiskelFramePickerWidget.setFirstFrameIndex(0);
+    } else {
+      this.currentPiskelFramePickerWidget.setFirstFrameIndex(1);
+    }
+  };
+
+  ns.InsertLocation.prototype.onShow = function () {
+    // Initialize the frame picker on show, to be able to calculate correctly the
+    // container's offsetWidth and offsetHeight.
+    this.currentPiskelFramePickerWidget.init();
+
+    var currentFrameIndex = this.piskelController.getCurrentFrameIndex();
+    this.currentPiskelFramePickerWidget.setFrameIndex(currentFrameIndex + 1);
+    this.currentPiskelFramePickerWidget.setFirstFrameIndex(0);
+
+    this.superclass.onShow.call(this);
+  };
+
+  ns.InsertLocation.prototype.onNextClick = function () {
+    var insertIndex = this.currentPiskelFramePickerWidget.getFrameIndex();
+    this.mergeData.insertIndex = insertIndex;
+    this.superclass.onNextClick.call(this);
+  };
+
+  ns.InsertLocation.prototype.destroy = function () {
+    this.currentPiskelFramePickerWidget.destroy();
+    this.superclass.destroy.call(this);
+  };
+})();

src/js/controller/dialogs/importwizard/steps/SelectMode.js

@@ -0,0 +1,42 @@
+(function () {
+  var ns = $.namespace('pskl.controller.dialogs.importwizard.steps');
+
+  ns.SelectMode = function (piskelController, importController, container) {
+    this.superclass.constructor.apply(this, arguments);
+  };
+
+  ns.SelectMode.MODES = {
+    REPLACE : 'replace',
+    MERGE : 'merge'
+  };
+
+  pskl.utils.inherit(ns.SelectMode, ns.AbstractImportStep);
+
+  ns.SelectMode.prototype.init = function () {
+    this.superclass.init.call(this);
+
+    var replaceButton = this.container.querySelector('.import-mode-replace-button');
+    var mergeButton = this.container.querySelector('.import-mode-merge-button');
+
+    this.addEventListener(replaceButton, 'click', this.onReplaceButtonClick_);
+    this.addEventListener(mergeButton, 'click', this.onMergeButtonClick_);
+  };
+
+  ns.SelectMode.prototype.onShow = function () {
+    this.superclass.onShow.call(this);
+  };
+
+  ns.SelectMode.prototype.destroy = function () {
+    this.superclass.destroy.call(this);
+  };
+
+  ns.SelectMode.prototype.onReplaceButtonClick_ = function () {
+    this.mergeData.importMode = ns.SelectMode.MODES.REPLACE;
+    this.onNextClick();
+  };
+
+  ns.SelectMode.prototype.onMergeButtonClick_ = function () {
+    this.mergeData.importMode = ns.SelectMode.MODES.MERGE;
+    this.onNextClick();
+  };
+})();

src/js/controller/piskel/PiskelController.js

@@ -12,11 +12,15 @@
   /**
    * Set the current piskel. Will reset the selected frame and layer unless specified
    * @param {Object} piskel
-   * @param {Boolean} preserveState if true, keep the selected frame and layer
+   * @param {Object} options:
+   *                 preserveState {Boolean} if true, keep the selected frame and layer
+   *                 noSnapshot {Boolean} if true, do not save a snapshot in the piskel
+   *                            history for this call to setPiskel
    */
-  ns.PiskelController.prototype.setPiskel = function (piskel, preserveState) {
+  ns.PiskelController.prototype.setPiskel = function (piskel, options) {
     this.piskel = piskel;
-    if (!preserveState) {
+    options = options || {};
+    if (!options.preserveState) {
       this.currentLayerIndex = 0;
       this.currentFrameIndex = 0;
     }
@@ -155,8 +159,7 @@
   };
 
   ns.PiskelController.prototype.getFrameCount = function () {
-    var layer = this.piskel.getLayerAt(0);
-    return layer.size();
+    return this.piskel.getFrameCount();
   };
 
   ns.PiskelController.prototype.setCurrentFrameIndex = function (index) {
@@ -231,6 +234,14 @@
     return name;
   };
 
+  ns.PiskelController.prototype.duplicateCurrentLayer = function () {
+    var layer = this.getCurrentLayer();
+    var clone = pskl.utils.LayerUtils.clone(layer);
+    var currentLayerIndex = this.getCurrentLayerIndex();
+    this.piskel.addLayerAt(clone, currentLayerIndex + 1);
+    this.setCurrentLayerIndex(currentLayerIndex + 1);
+  };
+
   ns.PiskelController.prototype.createLayer = function (name) {
     if (!name) {
       name = this.generateLayerName_();
@@ -240,9 +251,9 @@
       for (var i = 0 ; i < this.getFrameCount() ; i++) {
         layer.addFrame(this.createEmptyFrame_());
       }
-      this.piskel.addLayer(layer);
-      this.setCurrentLayerIndex(this.piskel.getLayers().length - 1);
-
+      var currentLayerIndex = this.getCurrentLayerIndex();
+      this.piskel.addLayerAt(layer, currentLayerIndex + 1);
+      this.setCurrentLayerIndex(currentLayerIndex + 1);
     } else {
       throw 'Layer name should be unique';
     }
@@ -252,15 +263,15 @@
     return this.piskel.getLayersByName(name).length > 0;
   };
 
-  ns.PiskelController.prototype.moveLayerUp = function () {
+  ns.PiskelController.prototype.moveLayerUp = function (toTop) {
     var layer = this.getCurrentLayer();
-    this.piskel.moveLayerUp(layer);
+    this.piskel.moveLayerUp(layer, toTop);
     this.selectLayer(layer);
   };
 
-  ns.PiskelController.prototype.moveLayerDown = function () {
+  ns.PiskelController.prototype.moveLayerDown = function (toBottom) {
     var layer = this.getCurrentLayer();
-    this.piskel.moveLayerDown(layer);
+    this.piskel.moveLayerDown(layer, toBottom);
     this.selectLayer(layer);
   };
 
@@ -270,16 +281,28 @@
   };
 
   ns.PiskelController.prototype.removeLayerAt = function (index) {
-    if (this.getLayers().length > 1) {
-      var layer = this.getLayerAt(index);
-      if (layer) {
-        this.piskel.removeLayer(layer);
-        this.setCurrentLayerIndex(0);
+    if (!this.hasLayerAt(index)) {
+      return;
     }
+
+    var layer = this.getLayerAt(index);
+    this.piskel.removeLayer(layer);
+
+    // Update the selected layer if needed.
+    if (this.getCurrentLayerIndex() === index) {
+      this.setCurrentLayerIndex(Math.max(0, index - 1));
     }
   };
 
   ns.PiskelController.prototype.serialize = function () {
     return pskl.utils.serialization.Serializer.serialize(this.piskel);
   };
+
+  /**
+   * Check if the current sprite is empty. Emptiness here means no pixel has been filled
+   * on any layer or frame for the current sprite.
+   */
+  ns.PiskelController.prototype.isEmpty = function () {
+    return pskl.app.currentColorsService.getCurrentColors().length === 0;
+  };
 })();

src/js/controller/piskel/PublicPiskelController.js

@@ -31,6 +31,7 @@
     this.saveWrap_('duplicateFrameAt', true);
     this.saveWrap_('moveFrame', true);
     this.saveWrap_('createLayer', true);
+    this.saveWrap_('duplicateCurrentLayer', true);
     this.saveWrap_('mergeDownLayerAt', true);
     this.saveWrap_('moveLayerUp', true);
     this.saveWrap_('moveLayerDown', true);
@@ -48,14 +49,25 @@
     return this.piskelController;
   };
 
-  ns.PublicPiskelController.prototype.setPiskel = function (piskel, preserveState) {
-    this.piskelController.setPiskel(piskel, preserveState);
+  /**
+   * Set the current piskel. Will reset the selected frame and layer unless specified
+   * @param {Object} piskel
+   * @param {Object} options:
+   *                 preserveState {Boolean} if true, keep the selected frame and layer
+   *                 noSnapshot {Boolean} if true, do not save a snapshot in the piskel
+   *                            history for this call to setPiskel
+   */
+  ns.PublicPiskelController.prototype.setPiskel = function (piskel, options) {
+    this.piskelController.setPiskel(piskel, options);
 
     $.publish(Events.FRAME_SIZE_CHANGED);
     $.publish(Events.PISKEL_RESET);
+
+    if (!options || !options.noSnapshot) {
       $.publish(Events.PISKEL_SAVE_STATE, {
         type : pskl.service.HistoryService.SNAPSHOT
       });
+    }
   };
 
   ns.PublicPiskelController.prototype.resetWrap_ = function (methodName) {

src/js/controller/preview/PreviewController.js

@@ -102,7 +102,7 @@
       this.disablePreviewSizeWidget_('No other option available');
       validSizes = ['original'];
     } else if (seamlessModeEnabled) {
-      this.disablePreviewSizeWidget_('Disabled in seamless mode');
+      this.disablePreviewSizeWidget_('Disabled in tile mode');
       validSizes = ['original'];
     } else {
       this.enablePreviewSizeWidget_();
@@ -124,7 +124,13 @@
       if (this.previewSizes.hasOwnProperty(size)) {
         var previewSize = this.previewSizes[size];
         var isSizeEnabled = validSizes.indexOf(size) != -1;
-        previewSize.button.classList.toggle('preview-contextual-action-hidden', !isSizeEnabled);
+
+        // classList.toggle is not available on IE11.
+        if (isSizeEnabled) {
+          previewSize.button.classList.remove('preview-contextual-action-hidden');
+        } else {
+          previewSize.button.classList.add('preview-contextual-action-hidden');
+        }
       }
     }
 
@@ -174,7 +180,13 @@
   ns.PreviewController.prototype.updateOnionSkinPreview_ = function () {
     var enabledClassname = 'preview-toggle-onion-skin-enabled';
     var isEnabled = pskl.UserSettings.get(pskl.UserSettings.ONION_SKIN);
-    this.toggleOnionSkinButton.classList.toggle(enabledClassname, isEnabled);
+
+    // classList.toggle is not available on IE11.
+    if (isEnabled) {
+      this.toggleOnionSkinButton.classList.add(enabledClassname);
+    } else {
+      this.toggleOnionSkinButton.classList.remove(enabledClassname);
+    }
   };
 
   ns.PreviewController.prototype.selectPreviewSizeButton_ = function () {
@@ -297,7 +309,8 @@
     var isSeamless = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_MODE);
     this.renderer.setRepeated(isSeamless);
 
-    var height, width;
+    var width;
+    var height;
 
     if (isSeamless) {
       height = PREVIEW_SIZE;

src/js/controller/settings/ApplicationSettingsController.js

@@ -1,144 +0,0 @@
-(function () {
-  var ns = $.namespace('pskl.controller.settings');
-
-  ns.ApplicationSettingsController = function () {};
-
-  pskl.utils.inherit(ns.ApplicationSettingsController, pskl.controller.settings.AbstractSettingController);
-
-  ns.ApplicationSettingsController.prototype.init = function() {
-    this.backgroundContainer = document.querySelector('.background-picker-wrapper');
-    this.addEventListener(this.backgroundContainer, 'click', this.onBackgroundClick_);
-
-    // Highlight selected background :
-    var background = pskl.UserSettings.get(pskl.UserSettings.CANVAS_BACKGROUND);
-    var selectedBackground = this.backgroundContainer.querySelector('[data-background=' + background + ']');
-    if (selectedBackground) {
-      selectedBackground.classList.add('selected');
-    }
-
-    // Grid display and size
-    var gridWidth = pskl.UserSettings.get(pskl.UserSettings.GRID_WIDTH);
-    var gridSelect = document.querySelector('.grid-width-select');
-    var selectedOption = gridSelect.querySelector('option[value="' + gridWidth + '"]');
-    if (selectedOption) {
-      selectedOption.setAttribute('selected', 'selected');
-    }
-
-    this.addEventListener(gridSelect, 'change', this.onGridWidthChange_);
-
-    // Seamless mode
-    var seamlessMode = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_MODE);
-    var seamlessModeCheckbox = document.querySelector('.seamless-mode-checkbox');
-    if (seamlessMode) {
-      seamlessModeCheckbox.setAttribute('checked', seamlessMode);
-    }
-    this.addEventListener(seamlessModeCheckbox, 'change', this.onSeamlessModeChange_);
-
-    // Max FPS
-    var maxFpsInput = document.querySelector('.max-fps-input');
-    maxFpsInput.value = pskl.UserSettings.get(pskl.UserSettings.MAX_FPS);
-    this.addEventListener(maxFpsInput, 'change', this.onMaxFpsChange_);
-
-    // Color format
-    var colorFormat = pskl.UserSettings.get(pskl.UserSettings.COLOR_FORMAT);
-    var colorFormatSelect = document.querySelector('.color-format-select');
-    var selectedColorFormatOption = colorFormatSelect.querySelector('option[value="' + colorFormat + '"]');
-    if (selectedColorFormatOption) {
-      selectedColorFormatOption.setAttribute('selected', 'selected');
-    }
-
-    this.addEventListener(colorFormatSelect, 'change', this.onColorFormatChange_);
-
-    // Layer preview opacity
-    var layerOpacityInput = document.querySelector('.layer-opacity-input');
-    layerOpacityInput.value = pskl.UserSettings.get(pskl.UserSettings.LAYER_OPACITY);
-    this.addEventListener(layerOpacityInput, 'change', this.onLayerOpacityChange_);
-    this.addEventListener(layerOpacityInput, 'input', this.onLayerOpacityChange_);
-    this.updateLayerOpacityText_(layerOpacityInput.value);
-
-    // Seamless mask opacity
-    var seamlessOpacityInput = document.querySelector('.seamless-opacity-input');
-    seamlessOpacityInput.value = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_OPACITY);
-    this.addEventListener(seamlessOpacityInput, 'change', this.onSeamlessOpacityChange_);
-    this.addEventListener(seamlessOpacityInput, 'input', this.onSeamlessOpacityChange_);
-    this.updateSeamlessOpacityText_(seamlessOpacityInput.value);
-
-    // Form
-    this.applicationSettingsForm = document.querySelector('[name="application-settings-form"]');
-    this.addEventListener(this.applicationSettingsForm, 'submit', this.onFormSubmit_);
-  };
-
-  ns.ApplicationSettingsController.prototype.onGridWidthChange_ = function (evt) {
-    var width = parseInt(evt.target.value, 10);
-    pskl.UserSettings.set(pskl.UserSettings.GRID_WIDTH, width);
-  };
-
-  ns.ApplicationSettingsController.prototype.onColorFormatChange_ = function (evt) {
-    pskl.UserSettings.set(pskl.UserSettings.COLOR_FORMAT, evt.target.value);
-  };
-
-  ns.ApplicationSettingsController.prototype.onSeamlessModeChange_ = function (evt) {
-    pskl.UserSettings.set(pskl.UserSettings.SEAMLESS_MODE, evt.currentTarget.checked);
-  };
-
-  ns.ApplicationSettingsController.prototype.onBackgroundClick_ = function (evt) {
-    var target = evt.target;
-    var background = target.dataset.background;
-    if (background) {
-      pskl.UserSettings.set(pskl.UserSettings.CANVAS_BACKGROUND, background);
-      var selected = this.backgroundContainer.querySelector('.selected');
-      if (selected) {
-        selected.classList.remove('selected');
-      }
-      target.classList.add('selected');
-    }
-  };
-
-  ns.ApplicationSettingsController.prototype.onMaxFpsChange_ = function (evt) {
-    var target = evt.target;
-    var fps = parseInt(target.value, 10);
-    if (fps && !isNaN(fps)) {
-      pskl.UserSettings.set(pskl.UserSettings.MAX_FPS, fps);
-    } else {
-      target.value = pskl.UserSettings.get(pskl.UserSettings.MAX_FPS);
-    }
-  };
-
-  ns.ApplicationSettingsController.prototype.onLayerOpacityChange_ = function (evt) {
-    var target = evt.target;
-    var opacity = parseFloat(target.value);
-    if (!isNaN(opacity)) {
-      pskl.UserSettings.set(pskl.UserSettings.LAYER_OPACITY, opacity);
-      pskl.UserSettings.set(pskl.UserSettings.LAYER_PREVIEW, opacity !== 0);
-      this.updateLayerOpacityText_(opacity);
-    } else {
-      target.value = pskl.UserSettings.get(pskl.UserSettings.LAYER_OPACITY);
-    }
-  };
-
-  ns.ApplicationSettingsController.prototype.onSeamlessOpacityChange_ = function (evt) {
-    var target = evt.target;
-    var opacity = parseFloat(target.value);
-    if (!isNaN(opacity)) {
-      pskl.UserSettings.set(pskl.UserSettings.SEAMLESS_OPACITY, opacity);
-      this.updateSeamlessOpacityText_(opacity);
-    } else {
-      target.value = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_OPACITY);
-    }
-  };
-
-  ns.ApplicationSettingsController.prototype.updateLayerOpacityText_ = function (opacity) {
-    var layerOpacityText = document.querySelector('.layer-opacity-text');
-    layerOpacityText.innerHTML = opacity;
-  };
-
-  ns.ApplicationSettingsController.prototype.updateSeamlessOpacityText_ = function (opacity) {
-    var seamlessOpacityText = document.querySelector('.seamless-opacity-text');
-    seamlessOpacityText.innerHTML = opacity;
-  };
-
-  ns.ApplicationSettingsController.prototype.onFormSubmit_ = function (evt) {
-    evt.preventDefault();
-    $.publish(Events.CLOSE_SETTINGS_DRAWER);
-  };
-})();

src/js/controller/settings/ImportController.js

@@ -14,6 +14,7 @@
     this.hiddenOpenPiskelInput = document.querySelector('[name="open-piskel-input"]');
 
     this.addEventListener('.browse-local-button', 'click', this.onBrowseLocalClick_);
+    this.addEventListener('.browse-backups-button', 'click', this.onBrowseBackupsClick_);
     this.addEventListener('.file-input-button', 'click', this.onFileInputClick_);
 
     // different handlers, depending on the Environment
@@ -23,24 +24,6 @@
       this.addEventListener(this.hiddenOpenPiskelInput, 'change', this.onOpenPiskelChange_);
       this.addEventListener('.open-piskel-button', 'click', this.onOpenPiskelClick_);
     }
-
-    this.initRestoreSession_();
-  };
-
-  ns.ImportController.prototype.initRestoreSession_ = function () {
-    var previousSessionContainer = document.querySelector('.previous-session');
-    var previousInfo = pskl.app.backupService.getPreviousPiskelInfo();
-    if (previousInfo) {
-      var previousSessionTemplate_ = pskl.utils.Template.get('previous-session-info-template');
-      var date = pskl.utils.DateUtils.format(previousInfo.date, '{{H}}:{{m}} - {{Y}}/{{M}}/{{D}}');
-      previousSessionContainer.innerHTML = pskl.utils.Template.replace(previousSessionTemplate_, {
-        name : previousInfo.name,
-        date : date
-      });
-      this.addEventListener('.restore-session-button', 'click', this.onRestorePreviousSessionClick_);
-    } else {
-      previousSessionContainer.innerHTML = 'No piskel backup was found on this browser.';
-    }
   };
 
   ns.ImportController.prototype.closeDrawer_ = function () {
@@ -71,46 +54,52 @@
   };
 
   ns.ImportController.prototype.onBrowseLocalClick_ = function (evt) {
-    $.publish(Events.DIALOG_DISPLAY, {
+    $.publish(Events.DIALOG_SHOW, {
       dialogId : 'browse-local'
     });
     this.closeDrawer_();
   };
 
+  ns.ImportController.prototype.onBrowseBackupsClick_ = function (evt) {
+    $.publish(Events.DIALOG_SHOW, {
+      dialogId : 'browse-backups'
+    });
+    this.closeDrawer_();
+  };
+
   ns.ImportController.prototype.openPiskelFile_ = function (file) {
     if (this.isPiskel_(file)) {
-      pskl.utils.PiskelFileUtils.loadFromFile(file,
-        // onSuccess
-        function (piskel) {
-          pskl.app.piskelController.setPiskel(piskel);
-        },
-        // onError
-        function (reason) {
-          $.publish(Events.PISKEL_FILE_IMPORT_FAILED, [reason]);
+      $.publish(Events.DIALOG_SHOW, {
+        dialogId : 'import',
+        initArgs : {
+          rawFiles: [file]
+        }
       });
       this.closeDrawer_();
+    } else {
+      this.closeDrawer_();
+      console.error('The selected file is not a piskel file');
     }
   };
 
   ns.ImportController.prototype.importPictureFromFile_ = function () {
     var files = this.hiddenFileInput.files;
-    if (files.length == 1) {
-      var file = files[0];
-      if (this.isImage_(file)) {
-        $.publish(Events.DIALOG_DISPLAY, {
-          dialogId : 'import-image',
-          initArgs : file
+    // TODO : Simply filter and remove stuff
+    var areImages = Array.prototype.every.call(files, function (file) {
+      return file.type.indexOf('image') === 0;
+    });
+    if (areImages) {
+      $.publish(Events.DIALOG_SHOW, {
+        dialogId : 'import',
+        initArgs : {
+          rawFiles: files
+        }
       });
       this.closeDrawer_();
     } else {
       this.closeDrawer_();
-        console.error('File is not an image : ' + file.type);
+      console.error('Some files are not images');
     }
-    }
-  };
-
-  ns.ImportController.prototype.isImage_ = function (file) {
-    return file.type.indexOf('image') === 0;
   };
 
   ns.ImportController.prototype.isPiskel_ = function (file) {

src/js/controller/settings/PreferencesController.js

@@ -0,0 +1,35 @@
+(function () {
+  var ns = $.namespace('pskl.controller.settings');
+
+  var tabs = {
+    'misc' : {
+      template : 'templates/settings/preferences/misc.html',
+      controller : ns.preferences.MiscPreferencesController
+    },
+    'grid' : {
+      template : 'templates/settings/preferences/grid.html',
+      controller : ns.preferences.GridPreferencesController
+    },
+    'tile' : {
+      template : 'templates/settings/preferences/tile.html',
+      controller : ns.preferences.TilePreferencesController
+    }
+  };
+
+  ns.PreferencesController = function () {
+    this.tabsWidget = new pskl.widgets.Tabs(tabs, this, pskl.UserSettings.PREFERENCES_TAB);
+  };
+
+  pskl.utils.inherit(ns.PreferencesController, pskl.controller.settings.AbstractSettingController);
+
+  ns.PreferencesController.prototype.init = function() {
+    var container = document.querySelector('.settings-section-preferences');
+    this.tabsWidget.init(container);
+  };
+
+  ns.PreferencesController.prototype.destroy = function () {
+    this.tabsWidget.destroy();
+    this.superclass.destroy.call(this);
+  };
+
+})();

src/js/controller/settings/SaveController.js

@@ -34,7 +34,7 @@
     this.saveDesktopAsNewButton = document.querySelector('#save-desktop-as-new-button');
     this.saveFileDownloadButton = document.querySelector('#save-file-download-button');
 
-    this.safeAddEventListener_(this.saveLocalStorageButton, 'click', this.saveToLocalStorage_);
+    this.safeAddEventListener_(this.saveLocalStorageButton, 'click', this.saveToIndexedDb_);
     this.safeAddEventListener_(this.saveGalleryButton, 'click', this.saveToGallery_);
     this.safeAddEventListener_(this.saveDesktopButton, 'click', this.saveToDesktop_);
     this.safeAddEventListener_(this.saveDesktopAsNewButton, 'click', this.saveToDesktopAsNew_);
@@ -62,7 +62,7 @@
 
   ns.SaveController.prototype.insertSavePartials_ = function () {
     this.getPartials_().forEach(function (partial) {
-      pskl.utils.Template.insert(this.saveForm, 'beforeend', partial);
+      this.saveForm.insertAdjacentHTML('beforeend', pskl.utils.Template.get(partial));
     }.bind(this));
   };
 
@@ -99,7 +99,7 @@
     if (pskl.app.isLoggedIn()) {
       this.saveToGallery_();
     } else {
-      this.saveToLocalStorage_();
+      this.saveToIndexedDb_();
     }
   };
 
@@ -111,8 +111,8 @@
     this.saveTo_('saveToGallery', false);
   };
 
-  ns.SaveController.prototype.saveToLocalStorage_ = function () {
-    this.saveTo_('saveToLocalStorage', false);
+  ns.SaveController.prototype.saveToIndexedDb_ = function () {
+    this.saveTo_('saveToIndexedDb', false);
   };
 
   ns.SaveController.prototype.saveToDesktop_ = function () {

src/js/controller/settings/SettingsController.js

@@ -3,8 +3,8 @@
 
   var settings = {
     'user' : {
-      template : 'templates/settings/application.html',
-      controller : ns.ApplicationSettingsController
+      template : 'templates/settings/preferences.html',
+      controller : ns.PreferencesController
     },
     'resize' : {
       template : 'templates/settings/resize.html',

src/js/controller/settings/exportimage/ExportController.js

@@ -22,6 +22,7 @@
 
   ns.ExportController = function (piskelController) {
     this.piskelController = piskelController;
+    this.tabsWidget = new pskl.widgets.Tabs(tabs, this, pskl.UserSettings.EXPORT_TAB);
     this.onSizeInputChange_ = this.onSizeInputChange_.bind(this);
   };
 
@@ -47,47 +48,16 @@
     this.onSizeInputChange_();
 
     // Initialize tabs and panel
-    this.exportPanel = document.querySelector('.export-panel');
-    this.exportTabs = document.querySelector('.export-tabs');
-    this.addEventListener(this.exportTabs, 'click', this.onTabsClicked_);
-
-    var tab = pskl.UserSettings.get(pskl.UserSettings.EXPORT_TAB);
-    this.selectTab(tab);
+    var container = document.querySelector('.settings-section-export');
+    this.tabsWidget.init(container);
   };
 
   ns.ExportController.prototype.destroy = function () {
     this.sizeInputWidget.destroy();
-    this.currentController.destroy();
+    this.tabsWidget.destroy();
     this.superclass.destroy.call(this);
   };
 
-  ns.ExportController.prototype.selectTab = function (tabId) {
-    if (!tabs[tabId] || this.currentTab == tabId) {
-      return;
-    }
-
-    if (this.currentController) {
-      this.currentController.destroy();
-    }
-
-    this.exportPanel.innerHTML = pskl.utils.Template.get(tabs[tabId].template);
-    this.currentController = new tabs[tabId].controller(this.piskelController, this);
-    this.currentController.init();
-    this.currentTab = tabId;
-    pskl.UserSettings.set(pskl.UserSettings.EXPORT_TAB, tabId);
-
-    var selectedTab = this.exportTabs.querySelector('.selected');
-    if (selectedTab) {
-      selectedTab.classList.remove('selected');
-    }
-    this.exportTabs.querySelector('[data-tab-id="' + tabId + '"]').classList.add('selected');
-  };
-
-  ns.ExportController.prototype.onTabsClicked_ = function (e) {
-    var tabId = pskl.utils.Dom.getData(e.target, 'tabId');
-    this.selectTab(tabId);
-  };
-
   ns.ExportController.prototype.onScaleChange_ = function () {
     var value = parseFloat(this.scaleInput.value);
     if (!isNaN(value)) {

src/js/controller/settings/exportimage/GifExportController.js

@@ -14,14 +14,22 @@
   pskl.utils.inherit(ns.GifExportController, pskl.controller.settings.AbstractSettingController);
 
   ns.GifExportController.prototype.init = function () {
-
     this.uploadStatusContainerEl = document.querySelector('.gif-upload-status');
     this.previewContainerEl = document.querySelector('.gif-export-preview');
     this.uploadButton = document.querySelector('.gif-upload-button');
     this.downloadButton = document.querySelector('.gif-download-button');
+    this.repeatCheckbox = document.querySelector('.gif-repeat-checkbox');
+
+    // Initialize repeatCheckbox state
+    this.repeatCheckbox.checked = this.getRepeatSetting_();
 
     this.addEventListener(this.uploadButton, 'click', this.onUploadButtonClick_);
     this.addEventListener(this.downloadButton, 'click', this.onDownloadButtonClick_);
+    this.addEventListener(this.repeatCheckbox, 'change', this.onRepeatCheckboxChange_);
+
+    var currentColors = pskl.app.currentColorsService.getCurrentColors();
+    var tooManyColors = currentColors.length >= MAX_GIF_COLORS;
+    document.querySelector('.gif-export-warning').classList.toggle('visible', tooManyColors);
   };
 
   ns.GifExportController.prototype.getZoom_ = function () {
@@ -85,7 +93,8 @@
     var isTransparent = layers.some(function (l) {return l.isTransparent();});
     var preserveColors = !isTransparent && currentColors.length < MAX_GIF_COLORS;
 
-    var transparentColor, transparent;
+    var transparentColor;
+    var transparent;
     // transparency only supported if preserveColors is true, see Issue #357
     if (preserveColors) {
       transparentColor = this.getTransparentColor(currentColors);
@@ -104,6 +113,7 @@
       width: width * zoom,
       height: height * zoom,
       preserveColors : preserveColors,
+      repeat: this.getRepeatSetting_() ? 0 : 1,
       transparent : transparent
     });
 
@@ -148,6 +158,15 @@
     return transparentColor;
   };
 
+  ns.GifExportController.prototype.onRepeatCheckboxChange_ = function () {
+    var checked = this.repeatCheckbox.checked;
+    pskl.UserSettings.set(pskl.UserSettings.EXPORT_GIF_REPEAT, checked);
+  };
+
+  ns.GifExportController.prototype.getRepeatSetting_ = function () {
+    return pskl.UserSettings.get(pskl.UserSettings.EXPORT_GIF_REPEAT);
+  };
+
   ns.GifExportController.prototype.updateStatus_ = function (imageUrl, error) {
     if (imageUrl) {
       var linkTpl = '<a class="highlight" href="{{link}}" target="_blank">{{shortLink}}</a>';

src/js/controller/settings/exportimage/PngExportController.js

@@ -190,7 +190,7 @@
     var json = {
       'frames': frames,
       'meta': {
-        'app': 'https://github.com/juliandescottes/piskel/',
+        'app': 'https://github.com/piskelapp/piskel/',
         'version': '1.0',
         'image': name + '.png',
         'format': 'RGBA8888',
@@ -207,6 +207,14 @@
   };
 
   ns.PngExportController.prototype.onDataUriClick_ = function (evt) {
-    window.open(this.createPngSpritesheet_().toDataURL('image/png'));
+    var popup = window.open('about:blank');
+    var dataUri = this.createPngSpritesheet_().toDataURL('image/png');
+    window.setTimeout(function () {
+      var html = pskl.utils.Template.getAndReplace('data-uri-export-partial', {
+        src: dataUri
+      });
+      popup.document.title = dataUri;
+      popup.document.body.innerHTML = html;
+    }.bind(this), 500);
   };
 })();

src/js/controller/settings/preferences/GridPreferencesController.js

@@ -0,0 +1,90 @@
+(function () {
+  var ns = $.namespace('pskl.controller.settings.preferences');
+
+  var colorsMap = {
+    'transparent': Constants.TRANSPARENT_COLOR,
+    'white': '#FFF1E8',
+    'light-gray': '#C2C3C7',
+    'dark-gray': '#5F574F',
+    'black': '#000000',
+    'blue': '#29ADFF',
+    'dark-blue': '#1D2B53',
+    'green': '#00E436',
+    'dark-green': '#008751',
+    'peach': '#FFCCAA',
+    'pink': '#FF77A8',
+    'yellow': '#FFEC27',
+    'orange': '#FFA300',
+    'red': '#FF004D',
+  };
+
+  ns.GridPreferencesController = function (piskelController, preferencesController) {
+    this.piskelController = piskelController;
+    this.preferencesController = preferencesController;
+    this.sizePicker = new pskl.widgets.SizePicker(this.onSizePickerChanged_.bind(this));
+  };
+
+  pskl.utils.inherit(ns.GridPreferencesController, pskl.controller.settings.AbstractSettingController);
+
+  ns.GridPreferencesController.prototype.init = function () {
+    // Grid enabled
+    var isEnabled = pskl.UserSettings.get(pskl.UserSettings.GRID_ENABLED);
+    var enableGridCheckbox = document.querySelector('.enable-grid-checkbox');
+    if (isEnabled) {
+      enableGridCheckbox.setAttribute('checked', 'true');
+    }
+    this.addEventListener(enableGridCheckbox, 'change', this.onEnableGridChange_);
+
+    // Grid size
+    var gridWidth = pskl.UserSettings.get(pskl.UserSettings.GRID_WIDTH);
+    this.sizePicker.init(document.querySelector('.grid-size-container'));
+    this.sizePicker.setSize(gridWidth);
+
+    // Grid color
+    var colorListItemTemplate = pskl.utils.Template.get('color-list-item-template');
+
+    var gridColor = pskl.UserSettings.get(pskl.UserSettings.GRID_COLOR);
+    var gridColorSelect = document.querySelector('#grid-color');
+
+    var markup = '';
+    Object.keys(colorsMap).forEach(function (key, index) {
+      var background = colorsMap[key];
+      if (key === 'transparent') {
+        background = 'url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAIAAADZ' +
+            'F8uwAAAAGUlEQVQYV2M4gwH+YwCGIasIUwhT25BVBADtzYNYrHvv4gAAAABJRU5ErkJggg==)';
+      }
+      markup += pskl.utils.Template.replace(colorListItemTemplate, {
+        color: colorsMap[key],
+        title: key,
+        background: background,
+        ':selected': gridColor === colorsMap[key]
+      });
+    });
+    this.gridColorList = document.querySelector('.grid-colors-list');
+    this.gridColorList.innerHTML = markup;
+
+    this.addEventListener(this.gridColorList, 'click', this.onGridColorClicked_.bind(this));
+  };
+
+  ns.GridPreferencesController.prototype.destroy = function () {
+    this.sizePicker.destroy();
+    this.superclass.destroy.call(this);
+  };
+
+  ns.GridPreferencesController.prototype.onSizePickerChanged_ = function (size) {
+    pskl.UserSettings.set(pskl.UserSettings.GRID_WIDTH, size);
+  };
+
+  ns.GridPreferencesController.prototype.onEnableGridChange_ = function (evt) {
+    pskl.UserSettings.set(pskl.UserSettings.GRID_ENABLED, evt.currentTarget.checked);
+  };
+
+  ns.GridPreferencesController.prototype.onGridColorClicked_ = function (evt) {
+    var color = evt.target.dataset.color;
+    if (color) {
+      pskl.UserSettings.set(pskl.UserSettings.GRID_COLOR, color);
+      this.gridColorList.querySelector('.selected').classList.remove('selected');
+      evt.target.classList.add('selected');
+    }
+  };
+})();

src/js/controller/settings/preferences/MiscPreferencesController.js

@@ -0,0 +1,88 @@
+(function () {
+  var ns = $.namespace('pskl.controller.settings.preferences');
+
+  ns.MiscPreferencesController = function (piskelController, preferencesController) {
+    this.piskelController = piskelController;
+    this.preferencesController = preferencesController;
+  };
+
+  pskl.utils.inherit(ns.MiscPreferencesController, pskl.controller.settings.AbstractSettingController);
+
+  ns.MiscPreferencesController.prototype.init = function () {
+
+    this.backgroundContainer = document.querySelector('.background-picker-wrapper');
+    this.addEventListener(this.backgroundContainer, 'click', this.onBackgroundClick_);
+
+    // Highlight selected background :
+    var background = pskl.UserSettings.get(pskl.UserSettings.CANVAS_BACKGROUND);
+    var selectedBackground = this.backgroundContainer.querySelector('[data-background=' + background + ']');
+    if (selectedBackground) {
+      selectedBackground.classList.add('selected');
+    }
+
+    // Max FPS
+    var maxFpsInput = document.querySelector('.max-fps-input');
+    maxFpsInput.value = pskl.UserSettings.get(pskl.UserSettings.MAX_FPS);
+    this.addEventListener(maxFpsInput, 'change', this.onMaxFpsChange_);
+
+    // Color format
+    var colorFormat = pskl.UserSettings.get(pskl.UserSettings.COLOR_FORMAT);
+    var colorFormatSelect = document.querySelector('.color-format-select');
+    var selectedColorFormatOption = colorFormatSelect.querySelector('option[value="' + colorFormat + '"]');
+    if (selectedColorFormatOption) {
+      selectedColorFormatOption.setAttribute('selected', 'selected');
+    }
+    this.addEventListener(colorFormatSelect, 'change', this.onColorFormatChange_);
+
+    // Layer preview opacity
+    var layerOpacityInput = document.querySelector('.layer-opacity-input');
+    layerOpacityInput.value = pskl.UserSettings.get(pskl.UserSettings.LAYER_OPACITY);
+    this.addEventListener(layerOpacityInput, 'change', this.onLayerOpacityChange_);
+    this.addEventListener(layerOpacityInput, 'input', this.onLayerOpacityChange_);
+    this.updateLayerOpacityText_(layerOpacityInput.value);
+  };
+
+  ns.MiscPreferencesController.prototype.onBackgroundClick_ = function (evt) {
+    var target = evt.target;
+    var background = target.dataset.background;
+    if (background) {
+      pskl.UserSettings.set(pskl.UserSettings.CANVAS_BACKGROUND, background);
+      var selected = this.backgroundContainer.querySelector('.selected');
+      if (selected) {
+        selected.classList.remove('selected');
+      }
+      target.classList.add('selected');
+    }
+  };
+
+  ns.MiscPreferencesController.prototype.onColorFormatChange_ = function (evt) {
+    pskl.UserSettings.set(pskl.UserSettings.COLOR_FORMAT, evt.target.value);
+  };
+
+  ns.MiscPreferencesController.prototype.onMaxFpsChange_ = function (evt) {
+    var target = evt.target;
+    var fps = parseInt(target.value, 10);
+    if (fps && !isNaN(fps)) {
+      pskl.UserSettings.set(pskl.UserSettings.MAX_FPS, fps);
+    } else {
+      target.value = pskl.UserSettings.get(pskl.UserSettings.MAX_FPS);
+    }
+  };
+
+  ns.MiscPreferencesController.prototype.onLayerOpacityChange_ = function (evt) {
+    var target = evt.target;
+    var opacity = parseFloat(target.value);
+    if (!isNaN(opacity)) {
+      pskl.UserSettings.set(pskl.UserSettings.LAYER_OPACITY, opacity);
+      pskl.UserSettings.set(pskl.UserSettings.LAYER_PREVIEW, opacity !== 0);
+      this.updateLayerOpacityText_(opacity);
+    } else {
+      target.value = pskl.UserSettings.get(pskl.UserSettings.LAYER_OPACITY);
+    }
+  };
+
+  ns.MiscPreferencesController.prototype.updateLayerOpacityText_ = function (opacity) {
+    var layerOpacityText = document.querySelector('.layer-opacity-text');
+    layerOpacityText.innerHTML = (opacity * 1).toFixed(2);
+  };
+})();

src/js/controller/settings/preferences/TilePreferencesController.js

@@ -0,0 +1,47 @@
+(function () {
+  var ns = $.namespace('pskl.controller.settings.preferences');
+
+  ns.TilePreferencesController = function (piskelController, preferencesController) {
+    this.piskelController = piskelController;
+    this.preferencesController = preferencesController;
+  };
+
+  pskl.utils.inherit(ns.TilePreferencesController, pskl.controller.settings.AbstractSettingController);
+
+  ns.TilePreferencesController.prototype.init = function () {
+    // Tile mode
+    var tileMode = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_MODE);
+    var tileModeCheckbox = document.querySelector('.tile-mode-checkbox');
+    if (tileMode) {
+      tileModeCheckbox.setAttribute('checked', tileMode);
+    }
+    this.addEventListener(tileModeCheckbox, 'change', this.onTileModeChange_);
+
+    // Tile mask opacity
+    var tileMaskOpacityInput = document.querySelector('.tile-mask-opacity-input');
+    tileMaskOpacityInput.value = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_OPACITY);
+    this.addEventListener(tileMaskOpacityInput, 'change', this.onTileMaskOpacityChange_);
+    this.addEventListener(tileMaskOpacityInput, 'input', this.onTileMaskOpacityChange_);
+    this.updateTileMaskOpacityText_(tileMaskOpacityInput.value);
+  };
+
+  ns.TilePreferencesController.prototype.onTileModeChange_ = function (evt) {
+    pskl.UserSettings.set(pskl.UserSettings.SEAMLESS_MODE, evt.currentTarget.checked);
+  };
+
+  ns.TilePreferencesController.prototype.onTileMaskOpacityChange_ = function (evt) {
+    var target = evt.target;
+    var opacity = parseFloat(target.value);
+    if (!isNaN(opacity)) {
+      pskl.UserSettings.set(pskl.UserSettings.SEAMLESS_OPACITY, opacity);
+      this.updateTileMaskOpacityText_(opacity);
+    } else {
+      target.value = pskl.UserSettings.get(pskl.UserSettings.SEAMLESS_OPACITY);
+    }
+  };
+
+  ns.TilePreferencesController.prototype.updateTileMaskOpacityText_ = function (opacity) {
+    var seamlessOpacityText = document.querySelector('.tile-mask-opacity-text');
+    seamlessOpacityText.innerHTML = (opacity * 1).toFixed(2);
+  };
+})();

src/js/controller/settings/resize/ResizeController.js

@@ -6,8 +6,8 @@
 
     this.container = document.querySelector('.resize-canvas');
 
-    var anchorWidgetContainer = this.container.querySelector('.resize-origin-container');
-    this.anchorWidget = new ns.AnchorWidget(anchorWidgetContainer);
+    var anchorWidgetContainer = this.container.querySelector('.resize-anchor-container');
+    this.anchorWidget = new pskl.widgets.AnchorWidget(anchorWidgetContainer);
     this.defaultSizeController = new ns.DefaultSizeController(piskelController);
   };
 
@@ -28,7 +28,7 @@
     });
 
     var settings = pskl.UserSettings.get('RESIZE_SETTINGS');
-    var origin = ns.AnchorWidget.ORIGIN[settings.origin] || ns.AnchorWidget.ORIGIN.TOPLEFT;
+    var origin = pskl.widgets.AnchorWidget.ORIGIN[settings.origin] || 'TOPLEFT';
     this.anchorWidget.setOrigin(origin);
 
     if (settings.resizeContent) {
@@ -61,27 +61,21 @@
   ns.ResizeController.prototype.onResizeFormSubmit_ = function (evt) {
     evt.preventDefault();
 
-    var resizedLayers = this.piskelController.getLayers().map(this.resizeLayer_.bind(this));
-
     var currentPiskel = this.piskelController.getPiskel();
-    var fps = this.piskelController.getFPS();
-    var piskel = pskl.model.Piskel.fromLayers(resizedLayers, fps, currentPiskel.getDescriptor());
-    // propagate savepath to new Piskel
-    piskel.savePath = currentPiskel.savePath;
+    var piskel = pskl.utils.ResizeUtils.resizePiskel(currentPiskel, {
+      width :  parseInt(this.widthInput.value, 10),
+      height :  parseInt(this.heightInput.value, 10),
+      origin: this.anchorWidget.getOrigin(),
+      resizeContent: this.resizeContentCheckbox.checked
+    });
 
-    pskl.app.piskelController.setPiskel(piskel, true);
+    pskl.app.piskelController.setPiskel(piskel, {
+      preserveState: true
+    });
 
     $.publish(Events.CLOSE_SETTINGS_DRAWER);
   };
 
-  ns.ResizeController.prototype.resizeLayer_ = function (layer) {
-    var opacity = layer.getOpacity();
-    var resizedFrames = layer.getFrames().map(this.resizeFrame_.bind(this));
-    var resizedLayer = pskl.model.Layer.fromFrames(layer.getName(), resizedFrames);
-    resizedLayer.setOpacity(opacity);
-    return resizedLayer;
-  };
-
   ns.ResizeController.prototype.onResizeContentChange_ = function (evt) {
     var target = evt.target;
     if (target.checked) {
@@ -107,55 +101,4 @@
       maintainRatio : !!this.maintainRatioCheckbox.checked
     });
   };
-
-  /***********************/
-  /* RESIZE LOGIC */
-  /***********************/
-
-  ns.ResizeController.prototype.resizeFrame_ = function (frame) {
-    var width = parseInt(this.widthInput.value, 10);
-    var height = parseInt(this.heightInput.value, 10);
-    if (this.resizeContentCheckbox.checked) {
-      return pskl.utils.FrameUtils.resize(frame, width, height, false);
-    } else {
-      var resizedFrame = new pskl.model.Frame(width, height);
-      frame.forEachPixel(function (color, x, y) {
-        var translated = this.translateCoordinates_(x, y, frame, resizedFrame);
-        if (resizedFrame.containsPixel(translated.x, translated.y)) {
-          resizedFrame.setPixel(translated.x, translated.y, color);
-        }
-      }.bind(this));
-
-      return resizedFrame;
-    }
-  };
-
-  ns.ResizeController.prototype.translateCoordinates_ = function (x, y, frame, resizedFrame) {
-    return {
-      x : this.translateX_(x, frame.width, resizedFrame.width),
-      y : this.translateY_(y, frame.height, resizedFrame.height)
-    };
-  };
-
-  ns.ResizeController.prototype.translateX_ = function (x, width, resizedWidth) {
-    var origin = this.anchorWidget.getOrigin();
-    if (origin.indexOf('LEFT') != -1) {
-      return x;
-    } else if (origin.indexOf('RIGHT') != -1) {
-      return x - (width - resizedWidth);
-    } else {
-      return x - Math.round((width - resizedWidth) / 2);
-    }
-  };
-
-  ns.ResizeController.prototype.translateY_ = function (y, height, resizedHeight) {
-    var origin = this.anchorWidget.getOrigin();
-    if (origin.indexOf('TOP') != -1) {
-      return y;
-    } else if (origin.indexOf('BOTTOM') != -1) {
-      return y - (height - resizedHeight);
-    } else {
-      return y - Math.round((height - resizedHeight) / 2);
-    }
-  };
 })();

src/js/database/BackupDatabase.js

@@ -0,0 +1,258 @@
+(function () {
+  var ns = $.namespace('pskl.database');
+
+  var DB_NAME = 'PiskelSessionsDatabase';
+  var DB_VERSION = 1;
+
+  // Simple wrapper to promisify a request.
+  var _requestPromise = function (req) {
+    var deferred = Q.defer();
+    req.onsuccess = deferred.resolve.bind(deferred);
+    req.onerror = deferred.reject.bind(deferred);
+    return deferred.promise;
+  };
+
+  /**
+   * The BackupDatabase handles all the database interactions related
+   * to piskel snapshots continuously saved while during the usage of
+   * Piskel.
+   */
+  ns.BackupDatabase = function () {
+    this.db = null;
+  };
+
+  ns.BackupDatabase.DB_NAME = DB_NAME;
+
+  /**
+   * Open and initialize the database.
+   * Returns a promise that resolves when the databse is opened.
+   */
+  ns.BackupDatabase.prototype.init = function () {
+    var request = window.indexedDB.open(DB_NAME, DB_VERSION);
+    request.onupgradeneeded = this.onUpgradeNeeded_.bind(this);
+
+    return _requestPromise(request).then(function (event) {
+      this.db = event.target.result;
+      return this.db;
+    }.bind(this)).catch(function (e) {
+      console.log('Could not initialize the piskel backup database');
+    });
+  };
+
+  ns.BackupDatabase.prototype.onUpgradeNeeded_ = function (event) {
+    // Set this.db early to allow migration scripts to access it in oncomplete.
+    this.db = event.target.result;
+
+    // Create an object store "piskels" with the autoIncrement flag set as true.
+    var objectStore = this.db.createObjectStore('snapshots', { keyPath: 'id', autoIncrement : true });
+
+    objectStore.createIndex('session_id', 'session_id', { unique: false });
+    objectStore.createIndex('date', 'date', { unique: false });
+    objectStore.createIndex('session_id, date', ['session_id', 'date'], { unique: false });
+
+    objectStore.transaction.oncomplete = function(event) {
+      // Nothing to do at the moment!
+    }.bind(this);
+  };
+
+  ns.BackupDatabase.prototype.openObjectStore_ = function () {
+    return this.db.transaction(['snapshots'], 'readwrite').objectStore('snapshots');
+  };
+
+  /**
+   * Send an add request for the provided snapshot.
+   * Returns a promise that resolves the request event.
+   */
+  ns.BackupDatabase.prototype.createSnapshot = function (snapshot) {
+    var objectStore = this.openObjectStore_();
+    var request = objectStore.add(snapshot);
+    return _requestPromise(request);
+  };
+
+  /**
+   * Send a put request for the provided snapshot.
+   * Returns a promise that resolves the request event.
+   */
+  ns.BackupDatabase.prototype.updateSnapshot = function (snapshot) {
+    var objectStore = this.openObjectStore_();
+    var request = objectStore.put(snapshot);
+    return _requestPromise(request);
+  };
+
+  /**
+   * Send a delete request for the provided snapshot.
+   * Returns a promise that resolves the request event.
+   */
+  ns.BackupDatabase.prototype.deleteSnapshot = function (snapshot) {
+    var objectStore = this.openObjectStore_();
+    var request = objectStore.delete(snapshot.id);
+    return _requestPromise(request);
+  };
+
+  /**
+   * Send a get request for the provided snapshotId.
+   * Returns a promise that resolves the request event.
+   */
+  ns.BackupDatabase.prototype.getSnapshot = function (snapshotId) {
+    var objectStore = this.openObjectStore_();
+    var request = objectStore.get(snapshotId);
+    return _requestPromise(request).then(function (event) {
+      return event.target.result;
+    });
+  };
+
+  /**
+   * Get the last (most recent) snapshot that satisfies the accept filter provided.
+   * Returns a promise that will resolve with the first matching snapshot (or null
+   * if no valid snapshot is found).
+   *
+   * @param {Function} accept:
+   *        Filter method that takes a snapshot as argument and should return true
+   *        if the snapshot is valid.
+   */
+  ns.BackupDatabase.prototype.findLastSnapshot = function (accept) {
+    // Create the backup promise.
+    var deferred = Q.defer();
+
+    // Open a transaction to the snapshots object store.
+    var objectStore = this.db.transaction(['snapshots']).objectStore('snapshots');
+
+    var index = objectStore.index('date');
+    var range = IDBKeyRange.upperBound(Infinity);
+    index.openCursor(range, 'prev').onsuccess = function(event) {
+      var cursor = event.target.result;
+      var snapshot = cursor && cursor.value;
+
+      // Resolve null if we couldn't find a matching snapshot.
+      if (!snapshot) {
+        deferred.resolve(null);
+      } else if (accept(snapshot)) {
+        deferred.resolve(snapshot);
+      } else {
+        cursor.continue();
+      }
+    };
+
+    return deferred.promise;
+  };
+
+  /**
+   * Retrieve all the snapshots for a given session id, sorted by descending date order.
+   * Returns a promise that resolves with an array of snapshots.
+   *
+   * @param {String} sessionId
+   *        The session id
+   */
+  ns.BackupDatabase.prototype.getSnapshotsBySessionId = function (sessionId) {
+    // Create the backup promise.
+    var deferred = Q.defer();
+
+    // Open a transaction to the snapshots object store.
+    var objectStore = this.db.transaction(['snapshots']).objectStore('snapshots');
+
+    // Loop on all the saved snapshots for the provided piskel id
+    var index = objectStore.index('session_id, date');
+    var keyRange = IDBKeyRange.bound(
+      [sessionId, 0],
+      [sessionId, Infinity]
+    );
+
+    var snapshots = [];
+    // Ordered by date in descending order.
+    index.openCursor(keyRange, 'prev').onsuccess = function(event) {
+      var cursor = event.target.result;
+      if (cursor) {
+        snapshots.push(cursor.value);
+        cursor.continue();
+      } else {
+        // Consumed all piskel snapshots
+        deferred.resolve(snapshots);
+      }
+    };
+
+    return deferred.promise;
+  };
+
+  ns.BackupDatabase.prototype.getSessions = function () {
+    // Create the backup promise.
+    var deferred = Q.defer();
+
+    // Open a transaction to the snapshots object store.
+    var objectStore = this.db.transaction(['snapshots']).objectStore('snapshots');
+
+    var sessions = {};
+
+    var _createSession = function (snapshot) {
+      sessions[snapshot.session_id] = {
+        startDate: snapshot.date,
+        endDate: snapshot.date,
+        name: snapshot.name,
+        description: snapshot.description,
+        id: snapshot.session_id,
+        count: 1
+      };
+    };
+
+    var _updateSession = function (snapshot) {
+      var s = sessions[snapshot.session_id];
+      s.startDate = Math.min(s.startDate, snapshot.date);
+      s.endDate = Math.max(s.endDate, snapshot.date);
+      s.count++;
+
+      if (s.endDate === snapshot.date) {
+        // If the endDate was updated, update also the session metadata to
+        // reflect the latest state.
+        s.name = snapshot.name;
+        s.description = snapshot.description;
+      }
+    };
+
+    var index = objectStore.index('date');
+    var range = IDBKeyRange.upperBound(Infinity);
+    index.openCursor(range, 'prev').onsuccess = function(event) {
+      var cursor = event.target.result;
+      var snapshot = cursor && cursor.value;
+      if (!snapshot) {
+        deferred.resolve(sessions);
+      } else {
+        if (sessions[snapshot.session_id]) {
+          _updateSession(snapshot);
+        } else {
+          _createSession(snapshot);
+        }
+        cursor.continue();
+      }
+    };
+
+    return deferred.promise.then(function (sessions) {
+      // Convert the sessions map to an array.
+      return Object.keys(sessions).map(function (key) {
+        return sessions[key];
+      });
+    });
+  };
+
+  ns.BackupDatabase.prototype.deleteSnapshotsForSession = function (sessionId) {
+    // Create the backup promise.
+    var deferred = Q.defer();
+
+    // Open a transaction to the snapshots object store.
+    var objectStore = this.openObjectStore_();
+
+    // Loop on all the saved snapshots for the provided piskel id
+    var index = objectStore.index('session_id');
+    var keyRange = IDBKeyRange.only(sessionId);
+
+    index.openCursor(keyRange).onsuccess = function(event) {
+      var cursor = event.target.result;
+      if (cursor) {
+        cursor.delete();
+        cursor.continue();
+      } else {
+        deferred.resolve();
+      }
+    };
+
+    return deferred.promise;
+  };
+})();

src/js/database/PiskelDatabase.js

@@ -0,0 +1,139 @@
+(function () {
+  var ns = $.namespace('pskl.database');
+
+  var DB_NAME = 'PiskelDatabase';
+  var DB_VERSION = 1;
+
+  // Simple wrapper to promisify a request.
+  var _requestPromise = function (req) {
+    var deferred = Q.defer();
+    req.onsuccess = deferred.resolve.bind(deferred);
+    req.onerror = deferred.reject.bind(deferred);
+    return deferred.promise;
+  };
+
+  /**
+   * The PiskelDatabase handles all the database interactions related
+   * to the local piskel saved that can be performed in-browser.
+   */
+  ns.PiskelDatabase = function (options) {
+    this.db = null;
+  };
+
+  ns.PiskelDatabase.DB_NAME = DB_NAME;
+
+  ns.PiskelDatabase.prototype.init = function () {
+    var request = window.indexedDB.open(DB_NAME, DB_VERSION);
+    request.onupgradeneeded = this.onUpgradeNeeded_.bind(this);
+
+    return _requestPromise(request).then(function (event) {
+      this.db = event.target.result;
+      return this.db;
+    }.bind(this));
+  };
+
+  ns.PiskelDatabase.prototype.onUpgradeNeeded_ = function (event) {
+    // Set this.db early to allow migration scripts to access it in oncomplete.
+    this.db = event.target.result;
+
+    // Create an object store "piskels" with the autoIncrement flag set as true.
+    var objectStore = this.db.createObjectStore('piskels', { keyPath : 'name' });
+    objectStore.transaction.oncomplete = function(event) {
+      pskl.database.migrate.MigrateLocalStorageToIndexedDb.migrate(this);
+    }.bind(this);
+  };
+
+  ns.PiskelDatabase.prototype.openObjectStore_ = function () {
+    return this.db.transaction(['piskels'], 'readwrite').objectStore('piskels');
+  };
+
+  /**
+   * Send a get request for the provided name.
+   * Returns a promise that resolves the request event.
+   */
+  ns.PiskelDatabase.prototype.get = function (name) {
+    var objectStore = this.openObjectStore_();
+    return _requestPromise(objectStore.get(name)).then(function (event) {
+      return event.target.result;
+    });
+  };
+
+  /**
+   * List all locally saved piskels.
+   * Returns a promise that resolves an array of objects:
+   * - name: name of the piskel
+   * - description: description of the piskel
+   * - date: save date
+   *
+   * The sprite content is not contained in the object and
+   * needs to be retrieved with a separate get.
+   */
+  ns.PiskelDatabase.prototype.list = function () {
+    var deferred = Q.defer();
+
+    var piskels = [];
+    var objectStore = this.openObjectStore_();
+    var cursor = objectStore.openCursor();
+    cursor.onsuccess = function(event) {
+      var cursor = event.target.result;
+      if (cursor) {
+        piskels.push({
+          name: cursor.value.name,
+          date: cursor.value.date,
+          description: cursor.value.description
+        });
+        cursor.continue();
+      } else {
+        // Cursor consumed all availabled piskels
+        deferred.resolve(piskels);
+      }
+    };
+
+    cursor.onerror = function () {
+      deferred.reject();
+    };
+
+    return deferred.promise;
+  };
+
+  /**
+   * Send an put request for the provided args.
+   * Returns a promise that resolves the request event.
+   */
+  ns.PiskelDatabase.prototype.update = function (name, description, date, serialized) {
+    var data = {};
+
+    data.name = name;
+    data.serialized = serialized;
+    data.date = date;
+    data.description = description;
+
+    var objectStore = this.openObjectStore_();
+    return _requestPromise(objectStore.put(data));
+  };
+
+  /**
+   * Send an add request for the provided args.
+   * Returns a promise that resolves the request event.
+   */
+  ns.PiskelDatabase.prototype.create = function (name, description, date, serialized) {
+    var data = {};
+
+    data.name = name;
+    data.serialized = serialized;
+    data.date = date;
+    data.description = description;
+
+    var objectStore = this.openObjectStore_();
+    return _requestPromise(objectStore.add(data));
+  };
+
+  /**
+   * Delete a saved piskel for the provided name.
+   * Returns a promise that resolves the request event.
+   */
+  ns.PiskelDatabase.prototype.delete = function (name) {
+    var objectStore = this.openObjectStore_();
+    return _requestPromise(objectStore.delete(name));
+  };
+})();

src/js/database/migrate/MigrateLocalStorageToIndexedDb.js

@@ -0,0 +1,76 @@
+(function () {
+  var ns = $.namespace('pskl.database.migrate');
+
+  // Simple migration helper to move local storage saves to indexed db.
+  ns.MigrateLocalStorageToIndexedDb = {};
+
+  ns.MigrateLocalStorageToIndexedDb.migrate = function (piskelDatabase) {
+    var deferred = Q.defer();
+
+    var localStorageService = pskl.app.localStorageService;
+
+    var localStorageKeys = localStorageService.getKeys();
+    var migrationData = localStorageKeys.map(function (key) {
+      return {
+        name: key.name,
+        description: key.description,
+        date: key.date,
+        serialized: localStorageService.getPiskel(key.name)
+      };
+    });
+
+    // Define the sequential migration process.
+    // Wait for each sprite to be saved before saving the next one.
+    var success = true;
+    var migrateSprite = function (index) {
+      var data = migrationData[index];
+      if (!data) {
+        console.log('Data migration from local storage to indexed db finished.');
+        if (success) {
+          console.log('Local storage piskels successfully migrated. Old copies will be deleted.');
+          ns.MigrateLocalStorageToIndexedDb.deleteLocalStoragePiskels();
+        }
+
+        deferred.resolve();
+      } else {
+        ns.MigrateLocalStorageToIndexedDb.save_(piskelDatabase, data)
+          .then(function () {
+            migrateSprite(index + 1);
+          })
+          .catch(function (e) {
+            var success = false;
+            console.error('Failed to migrate local storage sprite for name: ' + data.name);
+            migrateSprite(index + 1);
+          });
+      }
+    };
+
+    // Start the migration.
+    migrateSprite(0);
+
+    return deferred.promise;
+  };
+
+  ns.MigrateLocalStorageToIndexedDb.save_ = function (piskelDatabase, piskelData) {
+    return piskelDatabase.get(piskelData.name).then(function (data) {
+      if (typeof data !== 'undefined') {
+        return piskelDatabase.update(piskelData.name, piskelData.description, piskelData.date, piskelData.serialized);
+      } else {
+        return piskelDatabase.create(piskelData.name, piskelData.description, piskelData.date, piskelData.serialized);
+      }
+    });
+  };
+
+  ns.MigrateLocalStorageToIndexedDb.deleteLocalStoragePiskels = function () {
+    var localStorageKeys = pskl.app.localStorageService.getKeys();
+
+    // Remove all sprites.
+    localStorageKeys.forEach(function (key) {
+      window.localStorage.removeItem('piskel.' + key.name);
+    });
+
+    // Remove keys.
+    window.localStorage.removeItem('piskel.keys');
+  };
+
+})();

src/js/devtools/DrawingTestPlayer.js

@@ -32,6 +32,7 @@
   };
 
   ns.DrawingTestPlayer.prototype.setupInitialState_ = function () {
+
     var size = this.initialState.size;
     var piskel = this.createPiskel_(size.width, size.height);
     pskl.app.piskelController.setPiskel(piskel);
@@ -39,9 +40,10 @@
     $.publish(Events.SELECT_PRIMARY_COLOR, [this.initialState.primaryColor]);
     $.publish(Events.SELECT_SECONDARY_COLOR, [this.initialState.secondaryColor]);
     $.publish(Events.SELECT_TOOL, [this.initialState.selectedTool]);
-    if (this.initialState.penSize) {
+
+    // Old tests do not have penSize stored in initialState, fallback to 1.
+    var penSize = this.initialState.penSize || 1;
     pskl.app.penSizeService.setPenSize(this.initialState.penSize);
-    }
   };
 
   ns.DrawingTestPlayer.prototype.createPiskel_ = function (width, height) {
@@ -108,6 +110,8 @@
         this.playTransformToolEvent_(recordEvent);
       } else if (recordEvent.type === 'instrumented-event') {
         this.playInstrumentedEvent_(recordEvent);
+      } else if (recordEvent.type === 'clipboard-event') {
+        this.playClipboardEvent_(recordEvent);
       }
 
       // Record the time spent replaying the event
@@ -169,6 +173,16 @@
     pskl.app.piskelController[recordEvent.methodName].apply(pskl.app.piskelController, recordEvent.args);
   };
 
+  ns.DrawingTestPlayer.prototype.playClipboardEvent_ = function (recordEvent) {
+    $.publish(recordEvent.event.type, {
+      preventDefault: function () {},
+      clipboardData: {
+        items: [],
+        setData: function () {}
+      }
+    });
+  };
+
   ns.DrawingTestPlayer.prototype.onTestEnd_ = function () {
     this.removeMouseShim_();
     // Restore the original drawing loop.

src/js/devtools/DrawingTestRecorder.js

@@ -15,6 +15,10 @@
     $.subscribe(Events.TRANSFORMATION_EVENT, this.onTransformationEvent_.bind(this));
     $.subscribe(Events.PRIMARY_COLOR_SELECTED, this.onColorEvent_.bind(this, true));
     $.subscribe(Events.SECONDARY_COLOR_SELECTED, this.onColorEvent_.bind(this, false));
+    $.subscribe(Events.CLIPBOARD_COPY, this.onClipboardEvent_.bind(this));
+    $.subscribe(Events.CLIPBOARD_CUT, this.onClipboardEvent_.bind(this));
+    $.subscribe(Events.CLIPBOARD_PASTE, this.onClipboardEvent_.bind(this));
+
 
     for (var key in this.piskelController) {
       if (typeof this.piskelController[key] == 'function') {
@@ -85,7 +89,7 @@
         which : domEvent.which,
         shiftKey : domEvent.shiftKey,
         altKey : domEvent.altKey,
-        ctrlKey : domEvent.ctrlKey,
+        ctrlKey : domEvent.ctrlKey || domEvent.metaKey,
         target : {
           nodeName : domEvent.target.nodeName
         }
@@ -136,12 +140,27 @@
     }
   };
 
+  ns.DrawingTestRecorder.prototype.onClipboardEvent_ = function (evt) {
+    if (this.isRecording) {
+      var recordEvent = {};
+      recordEvent.type = 'clipboard-event';
+      recordEvent.event = evt;
+      this.events.push(recordEvent);
+    }
+  };
+
   ns.DrawingTestRecorder.prototype.onInstrumentedMethod_ = function (callee, methodName, args) {
     if (this.isRecording) {
       var recordEvent = {};
       recordEvent.type = 'instrumented-event';
       recordEvent.methodName = methodName;
       recordEvent.args = Array.prototype.slice.call(args, 0);
+
+      if (methodName === 'setPiskel' && args[1].noSnapshot) {
+        // Skip recording calls to setPiskel that don't trigger a save.
+        return;
+      }
+
       this.events.push(recordEvent);
     }
   };

src/js/lib/gif/gif.worker.js

@@ -10,7 +10,8 @@
                 url = '../' + url;
             }
         } else {
-            var typedArray = [(worker + "").replace(/function \(\)\s?\{/, "").replace(/\}[^}]*$/, "")];
+            var fn = (worker + "").replace(/function\s?\(\)\s?\{/, "").replace(/\}[^}]*$/, "");
+            var typedArray = [fn];
             var blob = new Blob(typedArray, {
                 type: "application/javascript"
             }); // pass a useful mime type here

src/js/lib/scrollifneeded/scrollifneeded.js

@@ -0,0 +1,27 @@
+if (!Element.prototype.scrollIntoViewIfNeeded) {
+  Element.prototype.scrollIntoViewIfNeeded = function (centerIfNeeded) {
+    centerIfNeeded = arguments.length === 0 ? true : !!centerIfNeeded;
+
+    var parent = this.parentNode,
+        parentComputedStyle = window.getComputedStyle(parent, null),
+        parentBorderTopWidth = parseInt(parentComputedStyle.getPropertyValue('border-top-width')),
+        parentBorderLeftWidth = parseInt(parentComputedStyle.getPropertyValue('border-left-width')),
+        overTop = this.offsetTop - parent.offsetTop < parent.scrollTop,
+        overBottom = (this.offsetTop - parent.offsetTop + this.clientHeight - parentBorderTopWidth) > (parent.scrollTop + parent.clientHeight),
+        overLeft = this.offsetLeft - parent.offsetLeft < parent.scrollLeft,
+        overRight = (this.offsetLeft - parent.offsetLeft + this.clientWidth - parentBorderLeftWidth) > (parent.scrollLeft + parent.clientWidth),
+        alignWithTop = overTop && !overBottom;
+
+    if ((overTop || overBottom) && centerIfNeeded) {
+      parent.scrollTop = this.offsetTop - parent.offsetTop - parent.clientHeight / 2 - parentBorderTopWidth + this.clientHeight / 2;
+    }
+
+    if ((overLeft || overRight) && centerIfNeeded) {
+      parent.scrollLeft = this.offsetLeft - parent.offsetLeft - parent.clientWidth / 2 - parentBorderLeftWidth + this.clientWidth / 2;
+    }
+
+    if ((overTop || overBottom || overLeft || overRight) && !centerIfNeeded) {
+      this.scrollIntoView(alignWithTop);
+    }
+  };
+}

src/js/model/Piskel.js

@@ -16,7 +16,6 @@
       this.descriptor = descriptor;
       this.savePath = null;
       this.fps = fps;
-
     } else {
       throw 'Missing arguments in Piskel constructor : ' + Array.prototype.join.call(arguments, ',');
     }
@@ -70,6 +69,10 @@
     });
   };
 
+  ns.Piskel.prototype.getFrameCount = function () {
+    return this.getLayerAt(0).size();
+  };
+
   ns.Piskel.prototype.addLayer = function (layer) {
     this.layers.push(layer);
   };
@@ -78,20 +81,28 @@
     this.layers.splice(index, 0, layer);
   };
 
-  ns.Piskel.prototype.moveLayerUp = function (layer) {
+  ns.Piskel.prototype.moveLayerUp = function (layer, toTop) {
     var index = this.layers.indexOf(layer);
-    if (index > -1 && index < this.layers.length - 1) {
-      this.layers[index] = this.layers[index + 1];
-      this.layers[index + 1] = layer;
-    }
+    var toIndex = toTop ? this.layers.length - 1 : index + 1;
+    this.moveLayer_(index, toIndex);
   };
 
-  ns.Piskel.prototype.moveLayerDown = function (layer) {
+  ns.Piskel.prototype.moveLayerDown = function (layer, toBottom) {
     var index = this.layers.indexOf(layer);
-    if (index > 0) {
-      this.layers[index] = this.layers[index - 1];
-      this.layers[index - 1] = layer;
+    var toIndex = toBottom ? 0 : index - 1;
+    this.moveLayer_(index, toIndex);
+  };
+
+  /**
+   * Move the layer at the provided index to the provided toIndex.
+   */
+  ns.Piskel.prototype.moveLayer_ = function (fromIndex, toIndex) {
+    if (fromIndex == -1 || toIndex == -1 || fromIndex == toIndex) {
+      return;
     }
+    toIndex = pskl.utils.Math.minmax(toIndex, 0, this.layers.length - 1);
+    var layer = this.layers.splice(fromIndex, 1)[0];
+    this.layers.splice(toIndex, 0, layer);
   };
 
   ns.Piskel.prototype.removeLayer = function (layer) {

src/js/rendering/frame/CachedFrameRenderer.js

@@ -34,6 +34,7 @@
     var serializedFrame = [
       this.getZoom(),
       this.getGridWidth(),
+      this.getGridColor(),
       pskl.UserSettings.get('SEAMLESS_MODE'),
       pskl.UserSettings.get('SEAMLESS_OPACITY'),
       offset.x, offset.y,

src/js/rendering/frame/FrameRenderer.js

@@ -55,7 +55,7 @@
     this.displayCanvas = null;
     this.setDisplaySize(renderingOptions.width, renderingOptions.height);
 
-    this.setGridWidth(pskl.UserSettings.get(pskl.UserSettings.GRID_WIDTH));
+    this.setGridWidth(this.getUserGridWidth_());
 
     $.subscribe(Events.USER_SETTINGS_CHANGED, this.onUserSettingsChange_.bind(this));
   };
@@ -138,6 +138,10 @@
     this.offset.y = y;
   };
 
+  ns.FrameRenderer.prototype.getGridColor = function () {
+    return pskl.UserSettings.get(pskl.UserSettings.GRID_COLOR);
+  };
+
   ns.FrameRenderer.prototype.setGridWidth = function (value) {
     this.gridWidth_ = value;
   };
@@ -180,11 +184,18 @@
   };
 
   ns.FrameRenderer.prototype.onUserSettingsChange_ = function (evt, settingName, settingValue) {
-    if (settingName == pskl.UserSettings.GRID_WIDTH) {
-      this.setGridWidth(settingValue);
+    var settings = pskl.UserSettings;
+    if (settingName == settings.GRID_WIDTH || settingName == settings.GRID_ENABLED) {
+      this.setGridWidth(this.getUserGridWidth_());
     }
   };
 
+  ns.FrameRenderer.prototype.getUserGridWidth_ = function () {
+    var gridEnabled = pskl.UserSettings.get(pskl.UserSettings.GRID_ENABLED);
+    var width = pskl.UserSettings.get(pskl.UserSettings.GRID_WIDTH);
+    return gridEnabled ? width : 0;
+  };
+
   /**
    * Transform a screen pixel-based coordinate (relative to the top-left corner of the rendered
    * frame) into a sprite coordinate in column and row.
@@ -252,14 +263,24 @@
     var displayContext = this.displayCanvas.getContext('2d');
     displayContext.save();
 
+    var translateX = this.margin.x - this.offset.x * z;
+    var translateY = this.margin.y - this.offset.y * z;
+
+    var isZoomedOut = translateX > 0 || translateY > 0;
+    // Draw the background / zoomed-out color only if needed. Otherwise the clearRect
+    // happening after that will clear "out of bounds" and seems to be doing nothing
+    // on some chromebooks (cf https://github.com/piskelapp/piskel/issues/651)
+    if (isZoomedOut) {
       // Draw background
       displayContext.fillStyle = Constants.ZOOMED_OUT_BACKGROUND_COLOR;
+      // The -1 on the width and height here is a workaround for a Chrome-only bug
+      // that was potentially fixed, but is very hardware dependant. Seems to be
+      // triggered when doing clear rect or fill rect using the full width & height
+      // of a canvas. (https://bugs.chromium.org/p/chromium/issues/detail?id=469906)
       displayContext.fillRect(0, 0, this.displayCanvas.width - 1, this.displayCanvas.height - 1);
+    }
 
-    displayContext.translate(
-      this.margin.x - this.offset.x * z,
-      this.margin.y - this.offset.y * z
-    );
+    displayContext.translate(translateX, translateY);
 
     // Scale up to draw the canvas content
     displayContext.scale(z, z);
@@ -278,15 +299,25 @@
     // Draw grid.
     var gridWidth = this.computeGridWidthForDisplay_();
     if (gridWidth > 0) {
+      var gridColor = this.getGridColor();
       // Scale out before drawing the grid.
       displayContext.scale(1 / z, 1 / z);
-      // Clear vertical lines.
-      for (var i = 1 ; i < frame.getWidth() ; i++) {
-        displayContext.clearRect((i * z) - (gridWidth / 2), 0, gridWidth, h * z);
+
+      var drawOrClear;
+      if (gridColor === Constants.TRANSPARENT_COLOR) {
+        drawOrClear = displayContext.clearRect.bind(displayContext);
+      } else {
+        displayContext.fillStyle = gridColor;
+        drawOrClear = displayContext.fillRect.bind(displayContext);
       }
-      // Clear horizontal lines.
+
+      // Draw or clear vertical lines.
+      for (var i = 1 ; i < frame.getWidth() ; i++) {
+        drawOrClear((i * z) - (gridWidth / 2), 0, gridWidth, h * z);
+      }
+      // Draw or clear horizontal lines.
       for (var j = 1 ; j < frame.getHeight() ; j++) {
-        displayContext.clearRect(0, (j * z) - (gridWidth / 2), w * z, gridWidth);
+        drawOrClear(0, (j * z) - (gridWidth / 2), w * z, gridWidth);
       }
     }
 

src/js/selection/BaseSelection.js

@@ -5,9 +5,23 @@
     this.reset();
   };
 
+  ns.BaseSelection.prototype.stringify = function () {
+    return JSON.stringify({
+      pixels: this.pixels,
+      time: this.time
+    });
+  };
+
+  ns.BaseSelection.prototype.parse = function (str) {
+    var selectionData = JSON.parse(str);
+    this.pixels = selectionData.pixels;
+    this.time = selectionData.time;
+  };
+
   ns.BaseSelection.prototype.reset = function () {
     this.pixels = [];
     this.hasPastedContent = false;
+    this.time = -1;
   };
 
   ns.BaseSelection.prototype.move = function (colDiff, rowDiff) {
@@ -30,5 +44,8 @@
     });
 
     this.hasPastedContent = true;
+    // Keep track of the selection time to compare between local selection and
+    // paste event selections.
+    this.time = Date.now();
   };
 })();

src/js/selection/SelectionManager.js

@@ -17,14 +17,11 @@
     $.subscribe(Events.SELECTION_CREATED, $.proxy(this.onSelectionCreated_, this));
     $.subscribe(Events.SELECTION_DISMISSED, $.proxy(this.onSelectionDismissed_, this));
     $.subscribe(Events.SELECTION_MOVE_REQUEST, $.proxy(this.onSelectionMoved_, this));
-    $.subscribe(Events.SELECTION_COPY, this.copy.bind(this));
-    $.subscribe(Events.SELECTION_CUT, this.cut.bind(this));
-    $.subscribe(Events.SELECTION_PASTE, this.paste.bind(this));
+    $.subscribe(Events.CLIPBOARD_COPY, this.copy.bind(this));
+    $.subscribe(Events.CLIPBOARD_CUT, this.copy.bind(this));
+    $.subscribe(Events.CLIPBOARD_PASTE, this.paste.bind(this));
 
     var shortcuts = pskl.service.keyboard.Shortcuts;
-    pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.PASTE, this.paste.bind(this));
-    pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.CUT, this.cut.bind(this));
-    pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.COPY, this.copy.bind(this));
     pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.DELETE, this.onDeleteShortcut_.bind(this));
     pskl.app.shortcutService.registerShortcut(shortcuts.SELECTION.COMMIT, this.commit.bind(this));
 
@@ -78,29 +75,85 @@
       scope : this,
       replay : {
         type : SELECTION_REPLAY.ERASE,
-        pixels : JSON.parse(JSON.stringify(pixels.slice(0)))
+        pixels : JSON.parse(JSON.stringify(pixels))
       }
     });
   };
 
-  ns.SelectionManager.prototype.cut = function() {
-    if (this.currentSelection) {
-      // Put cut target into the selection:
+  ns.SelectionManager.prototype.copy = function(event, domEvent) {
+    if (this.currentSelection && this.piskelController.getCurrentFrame()) {
       this.currentSelection.fillSelectionFromFrame(this.piskelController.getCurrentFrame());
+      if (domEvent) {
+        domEvent.clipboardData.setData('text/plain', this.currentSelection.stringify());
+        domEvent.preventDefault();
+      }
+      if (event.type === Events.CLIPBOARD_CUT) {
         this.erase();
       }
+    }
   };
 
-  ns.SelectionManager.prototype.paste = function() {
-    if (!this.currentSelection || !this.currentSelection.hasPastedContent) {
-      if (window.localStorage.getItem('piskel.clipboard')) {
-        this.currentSelection = JSON.parse(window.localStorage.getItem('piskel.clipboard'));
-      } else {
+  ns.SelectionManager.prototype.paste = function(event, domEvent) {
+    var items = domEvent ? domEvent.clipboardData.items : [];
+
+    try {
+      for (var i = 0 ; i < items.length ; i++) {
+        var item = items[i];
+
+        if (/^image/i.test(item.type)) {
+          this.pasteImage_(item);
+          event.stopPropagation();
+          return;
+        }
+
+        if (/^text\/plain/i.test(item.type)) {
+          this.pasteText_(item);
+          event.stopPropagation();
           return;
         }
       }
+    } catch (e) {
+      // Some of the clipboard APIs are not available on Safari/IE
+      // Allow Piskel to fallback on local currentSelection pasting.
+    }
 
-    var pixels = this.currentSelection.pixels;
+    // temporarily keeping this code path for tests and fallbacks.
+    if (this.currentSelection && this.currentSelection.hasPastedContent) {
+      this.pastePixelsOnCurrentFrame_(this.currentSelection.pixels);
+    }
+  };
+
+  ns.SelectionManager.prototype.pasteImage_ = function(clipboardItem) {
+    var blob = clipboardItem.getAsFile();
+    pskl.utils.FileUtils.readImageFile(blob, function (image) {
+      pskl.app.fileDropperService.dropPosition_ = {x: 0, y: 0};
+      pskl.app.fileDropperService.onImageLoaded_(image, blob);
+    }.bind(this));
+  };
+
+  ns.SelectionManager.prototype.pasteText_ = function(clipboardItem) {
+    var blob = clipboardItem.getAsString(function (selectionString) {
+      var selectionData = JSON.parse(selectionString);
+      var time = selectionData.time;
+      var pixels = selectionData.pixels;
+
+      if (this.currentSelection && this.currentSelection.time >= time) {
+        // If the local selection is newer or equal to the one coming from the clipboard event
+        // use the local one. The reason is that the "move" information is only updated locally
+        // without synchronizing it to the clipboard.
+        // TODO: the selection should store the origin of the selection and the selection itself
+        // separately.
+        pixels = this.currentSelection.pixels;
+      }
+
+      if (pixels) {
+        // If the current clipboard data is some random text, pixels will not be defined.
+        this.pastePixelsOnCurrentFrame_(pixels);
+      }
+    }.bind(this));
+  };
+
+  ns.SelectionManager.prototype.pastePixelsOnCurrentFrame_ = function (pixels) {
     var frame = this.piskelController.getCurrentFrame();
 
     this.pastePixels_(frame, pixels);
@@ -123,8 +176,7 @@
     var tool = pskl.app.drawingController.currentToolBehavior;
     var isSelectionTool = tool instanceof pskl.tools.drawing.selection.BaseSelect;
     if (isSelectionTool) {
-      var overlay = pskl.app.drawingController.overlayFrame;
-      tool.commitSelection(overlay);
+      tool.commitSelection();
     }
   };
 
@@ -147,13 +199,6 @@
     });
   };
 
-  ns.SelectionManager.prototype.copy = function() {
-    if (this.currentSelection && this.piskelController.getCurrentFrame()) {
-      this.currentSelection.fillSelectionFromFrame(this.piskelController.getCurrentFrame());
-      window.localStorage.setItem('piskel.clipboard', JSON.stringify(this.currentSelection));
-    }
-  };
-
   /**
    * @private
    */

src/js/service/BackupService.js

@@ -1,65 +1,161 @@
 (function () {
   var ns = $.namespace('pskl.service');
 
-  // 1 minute = 1000 * 60
-  var BACKUP_INTERVAL = 1000 * 60;
+  var ONE_SECOND = 1000;
+  var ONE_MINUTE = 60 * ONE_SECOND;
 
-  ns.BackupService = function (piskelController) {
+  // Save every minute = 1000 * 60
+  var BACKUP_INTERVAL = ONE_MINUTE;
+  // Store a new snapshot every 5 minutes.
+  var SNAPSHOT_INTERVAL = ONE_MINUTE * 5;
+  // Store up to 12 snapshots for a piskel session, min. 1 hour of work
+  var MAX_SNAPSHOTS_PER_SESSION = 12;
+  var MAX_SESSIONS = 10;
+
+  ns.BackupService = function (piskelController, backupDatabase) {
     this.piskelController = piskelController;
-    this.lastHash = null;
+    // Immediately store the current when initializing the Service to avoid storing
+    // empty sessions.
+    this.lastHash = this.piskelController.getPiskel().getHash();
+    this.nextSnapshotDate = -1;
+
+    // backupDatabase can be provided for testing purposes.
+    this.backupDatabase = backupDatabase || new pskl.database.BackupDatabase();
   };
 
   ns.BackupService.prototype.init = function () {
-    var previousPiskel = window.localStorage.getItem('bkp.next.piskel');
-    var previousInfo = window.localStorage.getItem('bkp.next.info');
-    if (previousPiskel && previousInfo) {
-      this.savePiskel_('prev', previousPiskel, previousInfo);
-    }
-
+    this.backupDatabase.init().then(function () {
       window.setInterval(this.backup.bind(this), BACKUP_INTERVAL);
+    }.bind(this));
+  };
+
+  // This is purely exposed for testing, so that backup dates can be set programmatically.
+  ns.BackupService.prototype.currentDate_ = function () {
+    return Date.now();
   };
 
   ns.BackupService.prototype.backup = function () {
     var piskel = this.piskelController.getPiskel();
-    var descriptor = piskel.getDescriptor();
     var hash = piskel.getHash();
-    var info = {
-      name : descriptor.name,
-      description : descriptor.info,
-      date : Date.now(),
-      hash : hash
-    };
 
     // Do not save an unchanged piskel
-    if (hash !== this.lastHash) {
+    if (hash === this.lastHash) {
+      return Q.resolve();
+    }
+
+    // Update the hash
+    // TODO: should only be done after a successful save.
     this.lastHash = hash;
-      var serializedPiskel = pskl.utils.serialization.Serializer.serialize(piskel);
-      this.savePiskel_('next', serializedPiskel, JSON.stringify(info));
-    }
+
+    // Prepare the backup snapshot.
+    var descriptor = piskel.getDescriptor();
+    var date = this.currentDate_();
+    var snapshot = {
+      session_id: pskl.app.sessionId,
+      date: date,
+      name: descriptor.name,
+      description: descriptor.description,
+      frames: piskel.getFrameCount(),
+      width: piskel.getWidth(),
+      height: piskel.getHeight(),
+      fps: piskel.getFPS(),
+      serialized: pskl.utils.serialization.Serializer.serialize(piskel)
     };
 
-  ns.BackupService.prototype.getPreviousPiskelInfo = function () {
-    var previousInfo = window.localStorage.getItem('bkp.prev.info');
-    if (previousInfo) {
-      return JSON.parse(previousInfo);
+    return this.getSnapshotsBySessionId(pskl.app.sessionId).then(function (snapshots) {
+      var latest = snapshots[0];
+
+      if (latest && date < this.nextSnapshotDate) {
+        // update the latest snapshot
+        snapshot.id = latest.id;
+        return this.backupDatabase.updateSnapshot(snapshot);
+      } else {
+        // add a new snapshot
+        this.nextSnapshotDate = date + SNAPSHOT_INTERVAL;
+        return this.backupDatabase.createSnapshot(snapshot).then(function () {
+          if (snapshots.length >= MAX_SNAPSHOTS_PER_SESSION) {
+            // remove oldest snapshot
+            return this.backupDatabase.deleteSnapshot(snapshots[snapshots.length - 1]);
+          }
+        }.bind(this)).then(function () {
+          var isNewSession = !latest;
+          if (!isNewSession) {
+            return;
+          }
+          return this.backupDatabase.getSessions().then(function (sessions) {
+            if (sessions.length <= MAX_SESSIONS) {
+              // If MAX_SESSIONS has not been reached, no need to delete
+              // previous sessions.
+              return;
             }
-  };
 
-  ns.BackupService.prototype.load = function() {
-    var previousPiskel = window.localStorage.getItem('bkp.prev.piskel');
-    previousPiskel = JSON.parse(previousPiskel);
+            // Prepare an array containing all the ids of the sessions to be deleted.
+            var sessionIdsToDelete = sessions.sort(function (s1, s2) {
+              return s1.startDate - s2.startDate;
+            }).map(function (s) {
+              return s.id;
+            }).slice(0, sessions.length - MAX_SESSIONS);
 
-    pskl.utils.serialization.Deserializer.deserialize(previousPiskel, function (piskel) {
-      pskl.app.piskelController.setPiskel(piskel);
+            // Delete all the extra sessions.
+            return Q.all(sessionIdsToDelete.map(function (id) {
+              return this.deleteSession(id);
+            }.bind(this)));
+          }.bind(this));
+        }.bind(this));
+      }
+    }.bind(this)).catch(function (e) {
+      console.error(e);
     });
   };
 
-  ns.BackupService.prototype.savePiskel_ = function (type, piskel, info) {
-    try {
-      window.localStorage.setItem('bkp.' + type + '.piskel', piskel);
-      window.localStorage.setItem('bkp.' + type + '.info', info);
-    } catch (e) {
-      console.error('Could not save piskel backup in localStorage.', e);
+  ns.BackupService.prototype.getSnapshotsBySessionId = function (sessionId) {
+    return this.backupDatabase.getSnapshotsBySessionId(sessionId);
+  };
+
+  ns.BackupService.prototype.deleteSession = function (sessionId) {
+    return this.backupDatabase.deleteSnapshotsForSession(sessionId);
+  };
+
+  ns.BackupService.prototype.getPreviousPiskelInfo = function () {
+    return this.backupDatabase.findLastSnapshot(function (snapshot) {
+      return snapshot.session_id !== pskl.app.sessionId;
+    });
+  };
+
+  ns.BackupService.prototype.list = function() {
+    return this.backupDatabase.getSessions();
+  };
+
+  ns.BackupService.prototype.loadSnapshotById = function(snapshotId) {
+    var deferred = Q.defer();
+
+    this.backupDatabase.getSnapshot(snapshotId).then(function (snapshot) {
+      pskl.utils.serialization.Deserializer.deserialize(
+        JSON.parse(snapshot.serialized),
+        function (piskel) {
+          pskl.app.piskelController.setPiskel(piskel);
+          deferred.resolve();
         }
+      );
+    });
+
+    return deferred.promise;
+  };
+
+  // Load "latest" backup snapshot.
+  ns.BackupService.prototype.load = function() {
+    var deferred = Q.defer();
+
+    this.getPreviousPiskelInfo().then(function (snapshot) {
+      pskl.utils.serialization.Deserializer.deserialize(
+        JSON.parse(snapshot.serialized),
+        function (piskel) {
+          pskl.app.piskelController.setPiskel(piskel);
+          deferred.resolve();
+        }
+      );
+    });
+
+    return deferred.promise;
   };
 })();

src/js/service/BeforeUnloadService.js

@@ -6,15 +6,40 @@
   };
 
   ns.BeforeUnloadService.prototype.init = function () {
+    if (pskl.utils.Environment.detectNodeWebkit()) {
+      // Add a dedicated listener to window 'close' event in nwjs environment.
+      var win = require('nw.gui').Window.get();
+      win.on('close', this.onNwWindowClose.bind(this, win));
+    }
+
     window.addEventListener('beforeunload', this.onBeforeUnload.bind(this));
   };
 
+  /**
+   * In nw.js environment "onbeforeunload" is not triggered when closing the window.
+   * Polyfill the behavior here.
+   */
+  ns.BeforeUnloadService.prototype.onNwWindowClose = function (win) {
+    var msg = this.onBeforeUnload();
+    if (msg) {
+      if (!window.confirm(msg)) {
+        return false;
+      }
+    }
+    win.close(true);
+  };
+
   ns.BeforeUnloadService.prototype.onBeforeUnload = function (evt) {
+    // Attempt one last backup. Some of it may fail due to the asynchronous
+    // nature of IndexedDB.
     pskl.app.backupService.backup();
     if (pskl.app.savedStatusService.isDirty()) {
-      var confirmationMessage = 'Your Piskel seems to have unsaved changes';
+      var confirmationMessage = 'Your current sprite has unsaved changes. Are you sure you want to quit?';
 
-      (evt || window.event).returnValue = confirmationMessage;
+      evt = evt || window.event;
+      if (evt) {
+        evt.returnValue = confirmationMessage;
+      }
       return confirmationMessage;
     }
   };

src/js/service/ClipboardService.js

@@ -0,0 +1,25 @@
+(function () {
+  var ns = $.namespace('pskl.service');
+
+  ns.ClipboardService = function (piskelController) {
+    this.piskelController = piskelController;
+  };
+
+  ns.ClipboardService.prototype.init = function () {
+    window.addEventListener('copy', this._onCopy.bind(this), true);
+    window.addEventListener('cut', this._onCut.bind(this), true);
+    window.addEventListener('paste', this._onPaste.bind(this), true);
+  };
+
+  ns.ClipboardService.prototype._onCut = function (event) {
+    $.publish(Events.CLIPBOARD_CUT, event);
+  };
+
+  ns.ClipboardService.prototype._onCopy = function (event) {
+    $.publish(Events.CLIPBOARD_COPY, event);
+  };
+
+  ns.ClipboardService.prototype._onPaste = function (event) {
+    $.publish(Events.CLIPBOARD_PASTE, event);
+  };
+})();

src/js/service/FileDropperService.js

@@ -35,7 +35,9 @@
       var isPiskel = /\.piskel$/i.test(file.name);
       var isPalette = /\.(gpl|txt|pal)$/i.test(file.name);
       if (isImage) {
-        this.readImageFile_(file);
+        pskl.utils.FileUtils.readImageFile(file, function (image) {
+          this.onImageLoaded_(image, file);
+        }.bind(this));
       } else if (isPiskel) {
         pskl.utils.PiskelFileUtils.loadFromFile(file, this.onPiskelFileLoaded_, this.onPiskelFileError_);
       } else if (isPalette) {
@@ -44,17 +46,13 @@
     }
   };
 
-  ns.FileDropperService.prototype.readImageFile_ = function (imageFile) {
-    pskl.utils.FileUtils.readFile(imageFile, this.processImageSource_.bind(this));
-  };
-
   ns.FileDropperService.prototype.onPaletteLoaded_ = function (palette) {
     pskl.app.paletteService.savePalette(palette);
     pskl.UserSettings.set(pskl.UserSettings.SELECTED_PALETTE, palette.id);
   };
 
   ns.FileDropperService.prototype.onPiskelFileLoaded_ = function (piskel) {
-    if (window.confirm('This will replace your current animation')) {
+    if (window.confirm(Constants.CONFIRM_OVERWRITE)) {
       pskl.app.piskelController.setPiskel(piskel);
     }
   };
@@ -63,16 +61,23 @@
     $.publish(Events.PISKEL_FILE_IMPORT_FAILED, [reason]);
   };
 
-  ns.FileDropperService.prototype.processImageSource_ = function (imageSource) {
-    var importedImage = new Image();
-    importedImage.onload = this.onImageLoaded_.bind(this, importedImage);
-    importedImage.src = imageSource;
-  };
+  ns.FileDropperService.prototype.onImageLoaded_ = function (importedImage, file) {
+    var piskelWidth = pskl.app.piskelController.getWidth();
+    var piskelHeight = pskl.app.piskelController.getHeight();
 
-  ns.FileDropperService.prototype.onImageLoaded_ = function (importedImage) {
     if (this.isMultipleFiles_) {
       this.piskelController.addFrameAtCurrentIndex();
       this.piskelController.selectNextFrame();
+    } else if (importedImage.width > piskelWidth || importedImage.height > piskelHeight) {
+      // For single file imports, if the file is too big, trigger the import wizard.
+      $.publish(Events.DIALOG_SHOW, {
+        dialogId : 'import',
+        initArgs : {
+          rawFiles: [file]
+        }
+      });
+
+      return;
     }
 
     var currentFrame = this.piskelController.getCurrentFrame();

src/js/service/ImageUploadService.js

@@ -15,10 +15,17 @@
       data : imageData
     };
 
+    var protocol = pskl.utils.Environment.isHttps() ? 'https' : 'http';
     var wrappedSuccess = function (response) {
-      success(Constants.IMAGE_SERVICE_GET_URL + response.responseText);
+      var getUrl = pskl.utils.Template.replace(Constants.IMAGE_SERVICE_GET_URL, {
+        protocol: protocol
+      });
+      success(getUrl + response.responseText);
     };
 
-    pskl.utils.Xhr.post(Constants.IMAGE_SERVICE_UPLOAD_URL, data, wrappedSuccess, error);
+    var uploadUrl = pskl.utils.Template.replace(Constants.IMAGE_SERVICE_UPLOAD_URL, {
+      protocol: protocol
+    });
+    pskl.utils.Xhr.post(uploadUrl, data, wrappedSuccess, error);
   };
 })();

src/js/service/ImportService.js

@@ -28,19 +28,24 @@
   /**
    * Given an image object and some options, create a new Piskel and open it
    * for editing.
-   * @param {!Image} image
-   * @param {!Object} options
-   * @param {!string} options.importType - 'single' if not spritesheet
-   * @param {!number} options.frameSizeX
-   * @param {!number} options.frameSizeY
-   * @param {number} [options.frameOffsetX] only used in spritesheet imports.
-   * @param {number} [options.frameOffsetY] only used in spritesheet imports.
-   * @param {!boolean} options.smoothing
-   * @param {function} [onComplete]
+   * @param {Image} image
+   * @param {Object} options
+   *        - {String}  importType 'single' if not spritesheet
+   *        - {String}  name
+   *        - {Boolean} smoothing
+   *        - {Number}  frameSizeX
+   *        - {Number}  frameSizeY
+   *        - {Number}  frameOffsetX (only used in spritesheet imports)
+   *        - {Number}  frameOffsetY (only used in spritesheet imports)
+   * @param {Function} onComplete
+   *        Callback called when the new piskel has been created, with the new piskel
+   *        as single argument.
    */
   ns.ImportService.prototype.newPiskelFromImage = function (image, options, onComplete) {
     onComplete = onComplete || Constants.EMPTY_FUNCTION;
     var importType = options.importType;
+    var name = options.name;
+    var smoothing = options.smoothing;
     var frameSizeX = options.frameSizeX;
     var frameSizeY = options.frameSizeY;
     var frameOffsetX = options.frameOffsetX;
@@ -56,26 +61,28 @@
           return pskl.utils.CanvasUtils.createFromImageData(frame.data);
         });
 
+        var piskel;
         if (importType === 'single' || images.length > 1) {
           // Single image import or animated gif
-          this.createPiskelFromImages_(images, frameSizeX, frameSizeY, options.smoothing);
+          piskel = this.createPiskelFromImages_(images, name, frameSizeX, frameSizeY, smoothing);
         } else {
           // Spritesheet
-          var frameImages = this.createImagesFromSheet_(images[0]);
-          this.createPiskelFromImages_(frameImages, frameSizeX, frameSizeY, options.smoothing);
+          var frameImages = this.createImagesFromSheet_(images[0], frameSizeX, frameSizeY, frameOffsetX, frameOffsetY);
+          piskel = this.createPiskelFromImages_(frameImages, name, frameSizeX, frameSizeY, smoothing);
         }
-        onComplete();
+        onComplete(piskel);
       }.bind(this),
       error: function () {
+        var piskel;
         if (importType === 'single') {
           // Single image
-          this.createPiskelFromImages_([image], frameSizeX, frameSizeY, options.smoothing);
+          piskel = this.createPiskelFromImages_([image], name, frameSizeX, frameSizeY, smoothing);
         } else {
           // Spritesheet
           var frameImages = this.createImagesFromSheet_(image, frameSizeX, frameSizeY, frameOffsetX, frameOffsetY);
-          this.createPiskelFromImages_(frameImages, frameSizeX, frameSizeY, options.smoothing);
+          piskel = this.createPiskelFromImages_(frameImages, name, frameSizeX, frameSizeY, smoothing);
         }
-        onComplete();
+        onComplete(piskel);
       }.bind(this)
     });
   };
@@ -108,14 +115,13 @@
    * @param {!boolean} smoothing
    * @private
    */
-  ns.ImportService.prototype.createPiskelFromImages_ = function (images,
+  ns.ImportService.prototype.createPiskelFromImages_ = function (images, name,
       frameSizeX, frameSizeY, smoothing) {
+    name = name || 'Imported piskel';
     var frames = this.createFramesFromImages_(images, frameSizeX, frameSizeY, smoothing);
     var layer = pskl.model.Layer.fromFrames('Layer 1', frames);
-    var descriptor = new pskl.model.piskel.Descriptor('Imported piskel', '');
-    var piskel = pskl.model.Piskel.fromLayers([layer], Constants.DEFAULT.FPS, descriptor);
-
-    this.piskelController_.setPiskel(piskel);
+    var descriptor = new pskl.model.piskel.Descriptor(name, '');
+    return pskl.model.Piskel.fromLayers([layer], Constants.DEFAULT.FPS, descriptor);
   };
 
   /**

src/js/service/keyboard/KeycodeTranslator.js

@@ -3,6 +3,7 @@
     8 : 'back',
     13 : 'enter',
     27 : 'esc',
+    32 : 'space',
     37 : 'left',
     38 : 'up',
     39 : 'right',

src/js/service/keyboard/Shortcuts.js

@@ -60,7 +60,12 @@
       FULL_PREVIEW : createShortcut('full-preview', 'Select full size preview', 'alt+3'),
       ONION_SKIN : createShortcut('onion-skin', 'Toggle onion skin', 'alt+O'),
       LAYER_PREVIEW : createShortcut('layer-preview', 'Toggle layer preview', 'alt+L'),
-      CLOSE_POPUP : createShortcut('close-popup', 'Close an opened popup', 'ESC')
+      MERGE_ANIMATION : createShortcut('import-animation', 'Open merge animation popup', 'ctrl+shift+M'),
+      CLOSE_POPUP : createShortcut('close-popup', 'Close an opened popup', 'ESC'),
+      OFFSET_UP : createShortcut('move-up', 'Move viewport up', 'shift+up'),
+      OFFSET_RIGHT : createShortcut('move-right', 'Move viewport right', 'shift+right'),
+      OFFSET_DOWN : createShortcut('move-down', 'Move viewport down', 'shift+down'),
+      OFFSET_LEFT : createShortcut('move-left', 'Move viewport left', 'shift+left'),
     },
 
     STORAGE : {
@@ -79,6 +84,10 @@
         '123456789'.split(''), '1 to 9')
     },
 
+    DEBUG : {
+      RELOAD_STYLES : createShortcut('move-left', 'Move viewport left', 'ctrl+alt+R'),
+    },
+
     CATEGORIES : ['TOOL', 'SELECTION', 'MISC', 'STORAGE', 'COLOR']
   };
 })();

src/js/service/palette/PaletteService.js

@@ -3,11 +3,12 @@
 
   ns.PaletteService = function () {
     this.dynamicPalettes = [];
-    this.localStorageService = window.localStorage;
+    // Exposed for tests.
+    this.localStorageGlobal = window.localStorage;
   };
 
   ns.PaletteService.prototype.getPalettes = function () {
-    var palettesString = this.localStorageService.getItem('piskel.palettes');
+    var palettesString = this.localStorageGlobal.getItem('piskel.palettes');
     var palettes = JSON.parse(palettesString) || [];
     palettes = palettes.map(function (palette) {
       return pskl.model.Palette.fromObject(palette);
@@ -54,7 +55,7 @@
     palettes = palettes.filter(function (palette) {
       return this.dynamicPalettes.indexOf(palette) === -1;
     }.bind(this));
-    this.localStorageService.setItem('piskel.palettes', JSON.stringify(palettes));
+    this.localStorageGlobal.setItem('piskel.palettes', JSON.stringify(palettes));
     $.publish(Events.PALETTE_LIST_UPDATED);
   };
 

src/js/service/performance/PerformanceReport.js

@@ -16,7 +16,7 @@
    */
   ns.PerformanceReport = function (piskel, colorsCount) {
     var pixels = piskel.getWidth() * piskel.getHeight();
-    this.resolution = pixels > (500 * 500);
+    this.resolution = pixels > (512 * 512);
 
     var layersCount = piskel.getLayers().length;
     this.layers = layersCount > 25;
@@ -24,10 +24,10 @@
     var framesCount = piskel.getLayerAt(0).size();
     this.frames = framesCount > 100;
 
-    this.colors = colorsCount > 100;
+    this.colors = colorsCount >= 256;
 
-    var overallScore = (pixels / 2500) + (layersCount * 4) + framesCount + colorsCount;
-    this.overall = overallScore > 100;
+    var overallScore = (pixels / 2620) + (layersCount * 4) + framesCount + (colorsCount * 100 / 256);
+    this.overall = overallScore > 200;
   };
 
   ns.PerformanceReport.prototype.equals = function (report) {

src/js/service/storage/IndexedDbStorageService.js

@@ -0,0 +1,57 @@
+(function () {
+  var ns = $.namespace('pskl.service.storage');
+
+  ns.IndexedDbStorageService = function (piskelController) {
+    this.piskelController = piskelController;
+    this.piskelDatabase = new pskl.database.PiskelDatabase();
+  };
+
+  ns.IndexedDbStorageService.prototype.init = function () {
+    this.piskelDatabase.init().catch(function (e) {
+      console.log('Failed to initialize PiskelDatabase, local browser saves will be unavailable.');
+    });
+  };
+
+  ns.IndexedDbStorageService.prototype.save = function (piskel) {
+    var name = piskel.getDescriptor().name;
+    var description = piskel.getDescriptor().description;
+    var date = Date.now();
+    var serialized = pskl.utils.serialization.Serializer.serialize(piskel);
+
+    return this.save_(name, description, date, serialized);
+  };
+
+  ns.IndexedDbStorageService.prototype.save_ = function (name, description, date, serialized) {
+    return this.piskelDatabase.get(name).then(function (piskelData) {
+      if (typeof piskelData !== 'undefined') {
+        return this.piskelDatabase.update(name, description, date, serialized);
+      } else {
+        return this.piskelDatabase.create(name, description, date, serialized);
+      }
+    }.bind(this));
+  };
+
+  ns.IndexedDbStorageService.prototype.load = function (name) {
+    return this.piskelDatabase.get(name).then(function (piskelData) {
+      if (typeof piskelData !== 'undefined') {
+        var serialized = piskelData.serialized;
+        pskl.utils.serialization.Deserializer.deserialize(
+          JSON.parse(serialized),
+          function (piskel) {
+            pskl.app.piskelController.setPiskel(piskel);
+          }
+        );
+      } else {
+        console.log('no local browser save found for name: ' + name);
+      }
+    });
+  };
+
+  ns.IndexedDbStorageService.prototype.remove = function (name) {
+    return this.piskelDatabase.delete(name);
+  };
+
+  ns.IndexedDbStorageService.prototype.getKeys = function () {
+    return this.piskelDatabase.list();
+  };
+})();

src/js/service/storage/StorageService.js

@@ -27,10 +27,15 @@
     return this.delegateSave_(pskl.app.galleryStorageService, piskel);
   };
 
+  // @deprecated, use saveToIndexedDb unless indexedDb is not available.
   ns.StorageService.prototype.saveToLocalStorage = function (piskel) {
     return this.delegateSave_(pskl.app.localStorageService, piskel);
   };
 
+  ns.StorageService.prototype.saveToIndexedDb = function (piskel) {
+    return this.delegateSave_(pskl.app.indexedDbStorageService, piskel);
+  };
+
   ns.StorageService.prototype.saveToFileDownload = function (piskel) {
     return this.delegateSave_(pskl.app.fileDownloadStorageService, piskel);
   };
@@ -67,7 +72,7 @@
       // wrap in timeout in order to start saving only after event.preventDefault
       // has been done
       window.setTimeout(function () {
-        this.saveToLocalStorage(this.piskelController.getPiskel());
+        this.saveToIndexedDb(this.piskelController.getPiskel());
       }.bind(this), 0);
     }
   };