pixel-editor/js/_layer.js

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JavaScript
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/** TODO LIST FOR LAYERS
GENERAL REQUIREMENTS:
- Saving the state of an artwork to a .lospec file so that people can work on it later keeping
the layers they created? That'd be cool, even for the app users, that could just double click on a lospec
file for it to be opened right in the pixel editor
OPTIONAL:
1 - Fix issues
*/
let layerList;
let layerListEntry;
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let layerDragSource = null;
let layerCount = 1;
let maxZIndex = 3;
let unusedIDs = [];
let currentID = layerCount;
let idToDelete;
let layerOptions = document.getElementById("layer-properties-menu");
let isRenamingLayer = false;
let oldLayerName = null;
on('click',"add-layer-button", addLayer, false);
/** Handler class for a single canvas (a single layer)
*
* @param width Canvas width
* @param height Canvas height
* @param canvas HTML canvas element
*/
class Layer {
constructor(width, height, canvas, menuEntry) {
this.canvasSize = [width, height];
this.canvas = canvas;
this.context = this.canvas.getContext('2d');
this.isSelected = false;
this.isVisible = true;
this.isLocked = false;
this.menuEntry = menuEntry;
let id = unusedIDs.pop();
console.log("id creato: " + id);
if (id == null) {
id = currentID;
currentID++;
}
this.id = "layer" + id;
if (menuEntry != null) {
this.name = menuEntry.getElementsByTagName("p")[0].innerHTML;
menuEntry.id = "layer" + id;
menuEntry.onclick = () => this.selectLayer();
menuEntry.getElementsByTagName("button")[0].onclick = () => this.toggleLock();
menuEntry.getElementsByTagName("button")[1].onclick = () => this.toggleVisibility();
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menuEntry.addEventListener("mouseup", this.openOptionsMenu, false);
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menuEntry.addEventListener("dragstart", this.layerDragStart, false);
menuEntry.addEventListener("drop", this.layerDragDrop, false);
menuEntry.addEventListener("dragover", this.layerDragOver, false);
menuEntry.addEventListener("dragleave", this.layerDragLeave, false);
menuEntry.addEventListener("dragend", this.layerDragEnd, false);
menuEntry.getElementsByTagName("canvas")[0].getContext('2d').imageSmoothingEnabled = false;
}
this.initialize();
}
// Initializes the canvas
initialize() {
var maxHorizontalZoom = Math.floor(window.innerWidth/this.canvasSize[0]*0.75);
var maxVerticalZoom = Math.floor(window.innerHeight/this.canvasSize[1]*0.75);
zoom = Math.min(maxHorizontalZoom,maxVerticalZoom);
if (zoom < 1) zoom = 1;
//resize canvas
this.canvas.width = this.canvasSize[0];
this.canvas.height = this.canvasSize[1];
this.canvas.style.width = (this.canvas.width*zoom)+'px';
this.canvas.style.height = (this.canvas.height*zoom)+'px';
//unhide canvas
this.canvas.style.display = 'block';
//center canvas in window
this.canvas.style.left = 64+canvasView.clientWidth/2-(this.canvasSize[0]*zoom/2)+'px';
this.canvas.style.top = 48+canvasView.clientHeight/2-(this.canvasSize[1]*zoom/2)+'px';
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this.context.imageSmoothingEnabled = false;
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this.context.mozImageSmoothingEnabled = false;
}
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setID(id) {
this.id = id;
if (this.menuEntry != null) {
this.menuEntry.id = id;
}
}
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layerDragStart(element) {
layerDragSource = this;
element.dataTransfer.effectAllowed = 'move';
element.dataTransfer.setData('text/html', this.id);
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this.classList.add('dragElem');
}
layerDragOver(element) {
if (element.preventDefault) {
element.preventDefault(); // Necessary. Allows us to drop.
}
this.classList.add('layerdragover');
element.dataTransfer.dropEffect = 'move';
return false;
}
layerDragLeave(element) {
this.classList.remove('layerdragover');
}
layerDragDrop(element) {
if (element.stopPropagation) {
element.stopPropagation(); // Stops some browsers from redirecting.
}
// Don't do anything if dropping the same column we're dragging.
if (layerDragSource != this) {
let toDropID = element.dataTransfer.getData('text/html');
let thisID = this.id;
moveLayers(toDropID, thisID);
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}
this.classList.remove('layerdragover');
dragging = false;
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return false;
}
layerDragEnd(element) {
this.classList.remove('layerdragover');
}
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// Resizes canvas
resize() {
let newWidth = (this.canvas.width * zoom) + 'px';
let newHeight = (this.canvas.height *zoom)+ 'px';
this.canvas.style.width = newWidth;
this.canvas.style.height = newHeight;
}
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setCanvasOffset (offsetLeft, offsetTop) {
//horizontal offset
var minXOffset = -this.canvasSize[0] * zoom + 164;
var maxXOffset = window.innerWidth - 148;
if (offsetLeft < minXOffset)
this.canvas.style.left = minXOffset +'px';
else if (offsetLeft > maxXOffset)
this.canvas.style.left = maxXOffset +'px';
else
this.canvas.style.left = offsetLeft +'px';
//vertical offset
var minYOffset = -this.canvasSize[1] * zoom + 164;
var maxYOffset = window.innerHeight - 100;
if (offsetTop < minYOffset)
this.canvas.style.top = minYOffset +'px';
else if (offsetTop > maxYOffset)
this.canvas.style.top = maxYOffset +'px';
else
this.canvas.style.top = offsetTop +'px';
}
// Copies the otherCanvas' position and size
copyData(otherCanvas) {
this.canvas.style.width = otherCanvas.canvas.style.width;
this.canvas.style.height = otherCanvas.canvas.style.height;
this.canvas.style.left = otherCanvas.canvas.style.left;
this.canvas.style.top = otherCanvas.canvas.style.top;
}
openOptionsMenu(event) {
if (event.which == 3) {
let target = event.target;
let offsets = getElementAbsolutePosition(this);
while (target != null && target.classList != null && !target.classList.contains("layers-menu-entry")) {
target = target.parentElement;
}
idToDelete = target.id;
layerOptions.style.visibility = "visible";
layerOptions.style.top = "0";
layerOptions.style.marginTop = "" + (event.clientY - 25) + "px";
getLayerByID(idToDelete).selectLayer();
}
}
closeOptionsMenu(event) {
layerOptions.style.visibility = "hidden";
currentLayer.menuEntry.getElementsByTagName("p")[0].setAttribute("contenteditable", false);
isRenamingLayer = false;
if (oldLayerName != null) {
let name = this.menuEntry.getElementsByTagName("p")[0].innerHTML;
this.name = name;
new HistoryStateRenameLayer(oldLayerName, name, currentLayer);
oldLayerName = null;
}
}
selectLayer(layer) {
if (layer == null) {
// Deselecting the old layer
currentLayer.deselectLayer();
// Selecting the current layer
this.isSelected = true;
this.menuEntry.classList.add("selected-layer");
currentLayer = getLayerByName(this.menuEntry.getElementsByTagName("p")[0].innerHTML);
}
else {
currentLayer.deselectLayer();
layer.isSelected = true;
layer.menuEntry.classList.add("selected-layer");
currentLayer = layer;
}
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/*
canvas = currentLayer.canvas;
context = currentLayer.context;
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*/
}
toggleLock() {
if (this.isLocked) {
this.unlock();
}
else {
this.lock();
}
}
toggleVisibility() {
if (this.isVisible) {
this.hide();
}
else {
this.show();
}
}
deselectLayer() {
this.isSelected = false;
this.menuEntry.classList.remove("selected-layer");
}
lock() {
this.isLocked = true;
this.menuEntry.getElementsByClassName("layer-button")[0].style.visibility = "visible";
this.menuEntry.getElementsByClassName("default-icon")[0].style.display = "none";
this.menuEntry.getElementsByClassName("edited-icon")[0].style.display = "inline-block";
}
unlock() {
this.isLocked = false;
this.menuEntry.getElementsByClassName("layer-button")[0].style.visibility = "hidden";
this.menuEntry.getElementsByClassName("default-icon")[0].style.display = "inline-block";
this.menuEntry.getElementsByClassName("edited-icon")[0].style.display = "none";
}
show() {
this.isVisible = true;
this.canvas.style.visibility = "visible";
this.menuEntry.getElementsByClassName("layer-button")[1].style.visibility = "hidden";
// Changing icon
this.menuEntry.getElementsByClassName("default-icon")[1].style.display = "inline-block";
this.menuEntry.getElementsByClassName("edited-icon")[1].style.display = "none";
}
hide() {
this.isVisible = false;
this.canvas.style.visibility = "hidden";
this.menuEntry.getElementsByClassName("layer-button")[1].style.visibility = "visible";
// Changing icon
this.menuEntry.getElementsByClassName("default-icon")[1].style.display = "none";
this.menuEntry.getElementsByClassName("edited-icon")[1].style.display = "inline-block";
}
updateLayerPreview() {
// Getting the canvas
let destination = this.menuEntry.getElementsByTagName("canvas")[0];
let widthRatio = this.canvasSize[0] / this.canvasSize[1];
let heightRatio = this.canvasSize[1] / this.canvasSize[0];
// Computing width and height for the preview image
let previewWidth = destination.width;
let previewHeight = destination.height;
// If the sprite is rectangular, I apply the ratio to the preview as well
if (widthRatio < 1) {
previewWidth = destination.width * widthRatio;
}
else if (widthRatio > 1) {
previewHeight = destination.height * heightRatio;
}
// La appiccico sulla preview
destination.getContext('2d').clearRect(0, 0, destination.width, destination.height);
destination.getContext('2d').drawImage(this.canvas,
// This is necessary to center the preview in the canvas
(destination.width - previewWidth) / 2, (destination.height - previewHeight) / 2,
previewWidth, previewHeight);
}
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}
function flatten(onlyVisible) {
if (!onlyVisible) {
// Selecting the first layer
let firstLayer = layerList.firstElementChild;
let nToFlatten = layerList.childElementCount - 1;
getLayerByID(firstLayer.id).selectLayer();
for (let i = 0; i < nToFlatten; i++) {
merge();
}
new HistoryStateFlattenAll(nToFlatten);
}
else {
// Getting all the visible layers
let visibleLayers = [];
let nToFlatten = 0;
for (let i=0; i<layers.length; i++) {
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console.log(layers[i].name);
if (layers[i].menuEntry != null && layers[i].isVisible) {
visibleLayers.push(layers[i]);
}
}
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console.log("da piallare: " + visibleLayers.length);
// Sorting them by z-index
visibleLayers.sort((a, b) => (a.canvas.style.zIndex > b.canvas.style.zIndex) ? -1 : 1);
// Selecting the last visible layer (the only one that won't get deleted)
visibleLayers[visibleLayers.length - 1].selectLayer();
// Merging all the layer but the last one
for (let i=0; i<visibleLayers.length - 1; i++) {
nToFlatten++;
console.log(visibleLayers[i].menuEntry.nextElementSibling);
new HistoryStateFlattenTwoVisibles(
visibleLayers[i + 1].context.getImageData(0, 0, visibleLayers[i].canvasSize[0], visibleLayers[i].canvasSize[1]),
visibleLayers[i].menuEntry.nextElementSibling,
layers.indexOf(visibleLayers[i]),
visibleLayers[i], visibleLayers[i + 1]
);
mergeLayers(visibleLayers[i + 1].context, visibleLayers[i].context);
// Deleting the above layer
visibleLayers[i].canvas.remove();
visibleLayers[i].menuEntry.remove();
layers.splice(layers.indexOf(visibleLayers[i]), 1);
}
new HistoryStateFlattenVisible(nToFlatten);
// Updating the layer preview
currentLayer.updateLayerPreview();
}
}
function merge(saveHistory = true) {
// Saving the layer that should be merged
let toMerge = currentLayer;
let toMergeIndex = layers.indexOf(toMerge);
// Getting layer below
let layerBelow = getLayerByID(currentLayer.menuEntry.nextElementSibling.id);
// If I have something to merge with
if (layerBelow != null) {
// Selecting that layer
layerBelow.selectLayer();
if (saveHistory) {
new HistoryStateMergeLayer(toMergeIndex, toMerge,
layerBelow.context.getImageData(0, 0, layerBelow.canvasSize[0], layerBelow.canvasSize[1]),
layerBelow);
}
mergeLayers(currentLayer.context, toMerge.context);
// Deleting the above layer
toMerge.canvas.remove();
toMerge.menuEntry.remove();
layers.splice(toMergeIndex, 1);
// Updating the layer preview
currentLayer.updateLayerPreview();
}
}
function deleteLayer(saveHistory = true) {
// Cannot delete all the layers
if (layers.length != 4) {
let layerIndex = layers.indexOf(currentLayer);
let toDelete = layers[layerIndex];
let previousSibling = toDelete.menuEntry.previousElementSibling;
// Adding the ids to the unused ones
console.log("id cancellato: " + toDelete.id);
unusedIDs.push(toDelete.id);
// Selecting the next layer
if (layerIndex != (layers.length - 3)) {
layers[layerIndex + 1].selectLayer();
}
// or the previous one if the next one doesn't exist
else {
layers[layerIndex - 1].selectLayer();
}
// Deleting canvas and entry
toDelete.canvas.remove();
toDelete.menuEntry.remove();
// Removing the layer from the list
layers.splice(layerIndex, 1);
if (saveHistory) {
new HistoryStateDeleteLayer(toDelete, previousSibling, layerIndex);
}
}
// Closing the menu
currentLayer.closeOptionsMenu();
}
function renameLayer(event) {
let layerIndex = layers.indexOf(currentLayer);
let toRename = currentLayer;
let p = currentLayer.menuEntry.getElementsByTagName("p")[0];
oldLayerName = p.innerHTML;
p.setAttribute("contenteditable", true);
p.classList.add("layer-name-editable");
p.focus();
simulateInput(65, true, false, false);
isRenamingLayer = true;
}
// Swaps two layer entries in the layer menu
function moveLayers(toDropLayer, staticLayer, saveHistory = true) {
let toDrop = getLayerByID(toDropLayer);
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let staticc = getLayerByID(staticLayer);
let layerCopy = layers.slice();
let beforeToDrop = toDrop.menuEntry.nextElementSibling;
let nMoved = 0;
layerCopy.sort((a, b) => (a.canvas.style.zIndex > b.canvas.style.zIndex) ? 1 : -1);
let toDropIndex = layerCopy.indexOf(toDrop);
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let staticIndex = layerCopy.indexOf(staticc);
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layerList.insertBefore(toDrop.menuEntry, staticc.menuEntry);
if (toDropIndex < staticIndex) {
let tmp = toDrop.canvas.style.zIndex;
let tmp2;
for (let i=toDropIndex+1; i<=staticIndex; i++) {
tmp2 = layerCopy[i].canvas.style.zIndex;
if (saveHistory) {
new HistoryStateMoveTwoLayers(layerCopy[i], tmp2, tmp);
}
layerCopy[i].canvas.style.zIndex = tmp;
tmp = tmp2;
nMoved++;
}
if (saveHistory) {
new HistoryStateMoveTwoLayers(toDrop, toDrop.canvas.style.zIndex, tmp);
}
toDrop.canvas.style.zIndex = tmp;
if (saveHistory) {
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new HistoryStateMoveLayer(beforeToDrop, toDrop, staticc, nMoved);
}
}
else {
// BUG QUI
let tmp = toDrop.canvas.style.zIndex;
let tmp2;
for (let i=toDropIndex-1; i>staticIndex; i--) {
tmp2 = layerCopy[i].canvas.style.zIndex;
if (saveHistory) {
new HistoryStateMoveTwoLayers(layerCopy[i], tmp2, tmp);
}
layerCopy[i].canvas.style.zIndex = tmp;
tmp = tmp2;
nMoved++;
}
if (saveHistory) {
new HistoryStateMoveTwoLayers(toDrop, toDrop.canvas.style.zIndex, tmp);
}
toDrop.canvas.style.zIndex = tmp;
if (saveHistory) {
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new HistoryStateMoveLayer(beforeToDrop, toDrop, staticc, nMoved);
}
}
}
// Finds a layer given its name
function getLayerByName(name) {
for (let i=0; i<layers.length; i++) {
if (layers[i].menuEntry != null) {
if (layers[i].menuEntry.getElementsByTagName("p")[0].innerHTML == name) {
return layers[i];
}
}
}
return null;
}
// Finds a layer given its id
function getLayerByID(id) {
for (let i=0; i<layers.length; i++) {
if (layers[i].menuEntry != null) {
if (layers[i].menuEntry.id == id) {
return layers[i];
}
}
}
return null;
}
function addLayer(id, saveHistory = true) {
// layers.length - 3
let index = layers.length - 3;
// Creating a new canvas
let newCanvas = document.createElement("canvas");
// Setting up the new canvas
canvasView.append(newCanvas);
maxZIndex++;
newCanvas.style.zIndex = maxZIndex;
newCanvas.classList.add("drawingCanvas");
console.log("Tela creata: " + newCanvas);
if (!layerListEntry) return console.warn('skipping adding layer because no document');
// Clone the default layer
let toAppend = layerListEntry.cloneNode(true);
// Setting the default name for the layer
toAppend.getElementsByTagName('p')[0].innerHTML = "Layer " + layerCount;
// Removing the selected class
toAppend.classList.remove("selected-layer");
// Adding the layer to the list
layerCount++;
// Creating a layer object
let newLayer = new Layer(currentLayer.canvasSize[0], currentLayer.canvasSize[1], newCanvas, toAppend);
newLayer.context.fillStyle = currentLayer.context.fillStyle;
newLayer.copyData(currentLayer);
layers.splice(index, 0, newLayer);
// Insert it before the Add layer button
layerList.insertBefore(toAppend, layerList.childNodes[0]);
if (id != null && typeof(id) == "string") {
newLayer.setID(id);
}
// Basically "if I'm not adding a layer because redo() is telling meto do so", then I can save the history
if (saveHistory) {
new HistoryStateAddLayer(newLayer, index);
}
return newLayer;
}
layerList = document.getElementById("layers-menu");