Extract import logic to ImportService

Isolates import dialog logic from actual import logic, which makes headless import eaiser to implement.

src/js/app.js

@@ -124,6 +124,8 @@
       this.storageService = new pskl.service.storage.StorageService(this.piskelController);
       this.storageService.init();
 
+      this.importService = new pskl.service.ImportService(this.piskelController, this.previewController);
+
       this.imageUploadService = new pskl.service.ImageUploadService();
       this.imageUploadService.init();
 

src/js/controller/dialogs/ImportImageController.js

@@ -171,84 +171,26 @@
   };
 
   ns.ImportImageController.prototype.importImageToPiskel_ = function () {
-    var image = this.importedImage_;
-    if (image) {
+    if (this.importedImage_) {
       if (window.confirm('You are about to create a new Piskel, unsaved changes will be lost.')) {
-        var gifLoader = new window.SuperGif({
-          gif : image
-        });
-
-        var resizeW = this.resizeWidth.val();
-        var resizeH = this.resizeHeight.val();
-
-        gifLoader.load({
-          success : function () {
-            var images = gifLoader.getFrames().map(function (frame) {
-              return pskl.utils.CanvasUtils.createFromImageData(frame.data);
-            });
-
-            if (this.getImportType_() === 'single' || images.length > 1) {
-              // Single image import or animated gif
-              this.createPiskelFromImages_(images, resizeW, resizeH);
-            } else {
-              // Spritesheet
-              this.createImagesFromSheet_(images[0]);
-            }
-            this.closeDialog();
-          }.bind(this),
-          error: function () {
-            if (this.getImportType_() === 'single') {
-              // Single image
-              this.createPiskelFromImages_([image], resizeW, resizeH);
-            } else {
-              // Spritesheet
-              this.createImagesFromSheet_(image);
-            }
-            this.closeDialog();
-          }.bind(this)
-        });
-
+        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.createImagesFromSheet_ = function (image) {
-    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);
-
-    var images = pskl.utils.CanvasUtils.createFramesFromImage(
-      image,
-      x,
-      y,
-      w,
-      h,
-      /*useHorizonalStrips=*/ true,
-      /*ignoreEmptyFrames=*/ true);
-    this.createPiskelFromImages_(images, w, h);
-  };
-
-  ns.ImportImageController.prototype.createFramesFromImages_ = function (images, w, h) {
-    var smoothing = !!this.smoothResize.prop('checked');
-
-    var frames = images.map(function (image) {
-      var resizedImage = pskl.utils.ImageResizer.resize(image, w, h, smoothing);
-      return pskl.utils.FrameUtils.createFromImage(resizedImage);
-    });
-    return frames;
-  };
-
-  ns.ImportImageController.prototype.createPiskelFromImages_ = function (images, w, h) {
-    var frames = this.createFramesFromImages_(images, w, h);
-    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], descriptor);
-
-    pskl.app.piskelController.setPiskel(piskel);
-    pskl.app.previewController.setFPS(Constants.DEFAULT.FPS);
-  };
-
   ns.ImportImageController.prototype.drawFrameGrid_ = function (frameX, frameY, frameW, frameH) {
     if (!this.importedImage_) {
       return;

src/js/service/ImportService.js

@@ -0,0 +1,121 @@
+/* Image and Animation import service supporting the import dialogs,
+ * file dropper service, and headless import API. */
+(function () {
+  /**
+   * @param {!PiskelController} piskelController
+   * @param {!PreviewController} previewController
+   * @constructor
+   */
+  var ImportService = $.namespace('pskl.service').ImportService =
+      function (piskelController, previewController) {
+    this.piskelController_ = piskelController;
+    this.previewController_ = previewController;
+  };
+
+  /**
+   * @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]
+   */
+  ImportService.prototype.newPiskelFromImage = function (image, options, onComplete) {
+    onComplete = onComplete || function () {};
+    var importType = options.importType;
+    var frameSizeX = options.frameSizeX;
+    var frameSizeY = options.frameSizeY;
+    var frameOffsetX = options.frameOffsetX;
+    var frameOffsetY = options.frameOffsetY;
+
+    var gifLoader = new window.SuperGif({
+      gif: image
+    });
+
+    gifLoader.load({
+      success: function () {
+        var images = gifLoader.getFrames().map(function (frame) {
+          return pskl.utils.CanvasUtils.createFromImageData(frame.data);
+        });
+
+        if (importType === 'single' || images.length > 1) {
+          // Single image import or animated gif
+          this.createPiskelFromImages_(images, frameSizeX, frameSizeY, options.smoothing);
+        } else {
+          // Spritesheet
+          var frameImages = this.createImagesFromSheet_(images[0]);
+          this.createPiskelFromImages_(frameImages, frameSizeX, frameSizeY, options.smoothing);
+        }
+        onComplete();
+      }.bind(this),
+      error: function () {
+        if (importType === 'single') {
+          // Single image
+          this.createPiskelFromImages_([image], frameSizeX, frameSizeY, options.smoothing);
+        } else {
+          // Spritesheet
+          var frameImages = this.createImagesFromSheet_(image, frameSizeX, frameSizeY, frameOffsetX, frameOffsetY);
+          this.createPiskelFromImages_(frameImages, frameSizeX, frameSizeY, options.smoothing);
+        }
+        onComplete();
+      }.bind(this)
+    });
+  };
+
+  /**
+   * @param {!Image} image
+   * @param {!number} frameSizeX
+   * @param {!number} frameSizeY
+   * @param {!number} frameOffsetX
+   * @param {!number} frameOffsetY
+   * @returns {canvas[]}
+   * @private
+   */
+  ImportService.prototype.createImagesFromSheet_ = function (image,
+      frameSizeX, frameSizeY, frameOffsetX, frameOffsetY) {
+    return pskl.utils.CanvasUtils.createFramesFromImage(
+        image,
+        frameOffsetX,
+        frameOffsetY,
+        frameSizeX,
+        frameSizeY,
+        /*useHorizonalStrips=*/ true,
+        /*ignoreEmptyFrames=*/ true);
+  };
+
+  /**
+   * @param {canvas[]} images
+   * @param {!number} frameSizeX
+   * @param {!number} frameSizeY
+   * @param {!boolean} smoothing
+   * @private
+   */
+  ImportService.prototype.createPiskelFromImages_ = function (images,
+      frameSizeX, frameSizeY, smoothing) {
+    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], descriptor);
+
+    this.piskelController_.setPiskel(piskel);
+    this.previewController_.setFPS(Constants.DEFAULT.FPS);
+  };
+
+  /**
+   * @param {!canvas[]} images
+   * @param {!number} frameSizeX
+   * @param {!number} frameSizeY
+   * @param {!boolean} smoothing
+   * @returns {pskl.model.Frame[]}
+   * @private
+   */
+  ImportService.prototype.createFramesFromImages_ = function (images, frameSizeX, frameSizeY, smoothing) {
+    return images.map(function (image) {
+      var resizedImage = pskl.utils.ImageResizer.resize(image, frameSizeX, frameSizeY, smoothing);
+      return pskl.utils.FrameUtils.createFromImage(resizedImage);
+    });
+  };
+})();

src/piskel-script-list.js

@@ -169,6 +169,7 @@
   "js/service/keyboard/Shortcut.js",
   "js/service/keyboard/Shortcuts.js",
   "js/service/keyboard/ShortcutService.js",
+  "js/service/ImportService.js",
   "js/service/ImageUploadService.js",
   "js/service/CurrentColorsService.js",
   "js/service/FileDropperService.js",