pixel-editor/js/_history.js

530 lines
14 KiB
JavaScript
Raw Normal View History

/** How the history works
* - undoStates stores the states that can be undone
* - redoStates stores the states that can be redone
* - undo() undoes an action and adds it to the redoStates
* - redo() redoes an action and adds it to the undoStates
* - Each HistoryState must implement an undo() and redo() function
* Those functions actually implement the undo and redo mechanism for that action,
* so you'll need to save the data you need as attributes in the constructor. For example,
* for the HistoryStateAddColour, the added colour is saved so that it can be removed in
* undo() or added back in redo().
* - Each HistoryState must call saveHistoryState(this) so that it gets added to the stack
*
*/
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var undoStates = [];
var redoStates = [];
const undoLogStyle = 'background: #87ff1c; color: black; padding: 5px;';
function HistoryStateResizeSprite(xRatio, yRatio, algo, oldData) {
this.xRatio = xRatio;
this.yRatio = yRatio;
this.algo = algo;
this.oldData = oldData;
this.undo = function() {
let layerIndex = 0;
currentAlgo = algo;
resizeSprite(null, [1 / this.xRatio, 1 / this.yRatio]);
// Also putting the old data
for (let i=0; i<layers.length; i++) {
if (layers[i].menuEntry != null) {
layers[i].context.putImageData(this.oldData[layerIndex], 0, 0);
layerIndex++;
layers[i].updateLayerPreview();
}
}
redoStates.push(this);
};
this.redo = function() {
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console.log("REDOOOO");
console.log("Ratio: " + this.xRatio + "," + this.yRatio);
currentAlgo = algo;
resizeSprite(null, [this.xRatio, this.yRatio]);
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateResizeCanvas(newSize, oldSize, imageDatas, trim) {
this.oldSize = oldSize;
this.newSize = newSize;
this.imageDatas = imageDatas;
this.trim = trim;
this.undo = function() {
let dataIndex = 0;
// Resizing the canvas
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resizeCanvas(null, oldSize, null, false);
// Putting the image datas
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for (let i=0; i<layers.length; i++) {
if (layers[i].menuEntry != null) {
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layers[i].context.putImageData(this.imageDatas[dataIndex], 0, 0);
dataIndex++;
}
}
redoStates.push(this);
};
this.redo = function() {
if (!this.trim) {
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resizeCanvas(null, newSize, null, false);
}
else {
trimCanvas(null, false);
}
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateFlattenVisible(flattened) {
this.nFlattened = flattened;
this.undo = function() {
for (let i=0; i<this.nFlattened; i++) {
undo();
}
redoStates.push(this);
};
this.redo = function() {
for (let i=0; i<this.nFlattened; i++) {
redo();
}
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateFlattenTwoVisibles(belowImageData, afterAbove, layerIndex, aboveLayer, belowLayer) {
this.aboveLayer = aboveLayer;
this.belowLayer = belowLayer;
this.belowImageData = belowImageData;
this.undo = function() {
canvasView.append(aboveLayer.canvas);
layerList.insertBefore(aboveLayer.menuEntry, afterAbove);
belowLayer.context.clearRect(0, 0, belowLayer.canvasSize[0], belowLayer.canvasSize[1]);
belowLayer.context.putImageData(this.belowImageData, 0, 0);
belowLayer.updateLayerPreview();
layers.splice(layerIndex, 0, aboveLayer);
redoStates.push(this);
};
this.redo = function() {
mergeLayers(belowLayer.context, aboveLayer.context);
// Deleting the above layer
aboveLayer.canvas.remove();
aboveLayer.menuEntry.remove();
layers.splice(layers.indexOf(aboveLayer), 1);
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateFlattenAll(nFlattened) {
this.nFlattened = nFlattened;
this.undo = function() {
for (let i=0; i<this.nFlattened - nAppLayers; i++) {
undo();
}
redoStates.push(this);
};
this.redo = function() {
for (let i=0; i<this.nFlattened - nAppLayers; i++) {
redo();
}
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateMergeLayer(aboveIndex, aboveLayer, belowData, belowLayer) {
this.aboveIndex = aboveIndex;
this.belowData = belowData;
this.aboveLayer = aboveLayer;
this.belowLayer = belowLayer;
this.undo = function() {
layerList.insertBefore(this.aboveLayer.menuEntry, this.belowLayer.menuEntry);
canvasView.append(this.aboveLayer.canvas);
belowLayer.context.clearRect(0, 0, this.belowLayer.canvasSize[0], this.belowLayer.canvasSize[1]);
belowLayer.context.putImageData(this.belowData, 0, 0);
belowLayer.updateLayerPreview();
layers.splice(this.aboveIndex, 0, this.aboveLayer);
redoStates.push(this);
};
this.redo = function() {
aboveLayer.selectLayer();
merge(false);
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateRenameLayer(oldName, newName, layer) {
this.edited = layer;
this.oldName = oldName;
this.newName = newName;
this.undo = function() {
layer.menuEntry.getElementsByTagName("p")[0].innerHTML = oldName;
redoStates.push(this);
};
this.redo = function() {
layer.menuEntry.getElementsByTagName("p")[0].innerHTML = newName;
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateDuplicateLayer(addedLayer, copiedLayer) {
this.addedLayer = addedLayer;
this.copiedLayer = copiedLayer;
this.undo = function() {
addedLayer.selectLayer();
deleteLayer(false);
redoStates.push(this);
};
this.redo = function() {
copiedLayer.selectLayer();
duplicateLayer(null, false);
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateDeleteLayer(layerData, before, index) {
this.deleted = layerData;
this.before = before;
this.index = index;
this.undo = function() {
canvasView.append(this.deleted.canvas);
if (this.before != null) {
layerList.insertBefore(this.deleted.menuEntry, this.before);
}
else {
layerList.prepend(this.deleted.menuEntry);
}
layers.splice(this.index, 0, this.deleted);
redoStates.push(this);
};
this.redo = function() {
this.deleted.selectLayer();
deleteLayer(false);
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateMoveTwoLayers(layer, oldIndex, newIndex) {
this.layer = layer;
this.oldIndex = oldIndex;
this.newIndex = newIndex;
this.undo = function() {
layer.canvas.style.zIndex = oldIndex;
redoStates.push(this);
};
this.redo = function() {
layer.canvas.style.zIndex = newIndex;
undoStates.push(this);
};
saveHistoryState(this);
}
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function HistoryStateMoveLayer(afterToDrop, toDrop, staticc, nMoved) {
this.beforeToDrop = afterToDrop;
this.toDrop = toDrop;
this.undo = function() {
toDrop.menuEntry.remove();
if (afterToDrop != null) {
layerList.insertBefore(toDrop.menuEntry, afterToDrop)
}
else {
layerList.append(toDrop.menuEntry);
}
for (let i=0; i<nMoved; i++) {
undo();
}
redoStates.push(this);
};
this.redo = function() {
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moveLayers(toDrop.menuEntry.id, staticc.menuEntry.id, true);
undoStates.push(this);
};
saveHistoryState(this);
}
function HistoryStateAddLayer(layerData, index) {
this.added = layerData;
this.index = index;
this.undo = function() {
redoStates.push(this);
if (layers.length - nAppLayers > this.index + 1) {
layers[this.index + 1].selectLayer();
}
else {
layers[this.index - 1].selectLayer();
}
this.added.canvas.remove();
this.added.menuEntry.remove();
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layers.splice(index, 1);
};
this.redo = function() {
undoStates.push(this);
canvasView.append(this.added.canvas);
layerList.prepend(this.added.menuEntry);
layers.splice(this.index, 0, this.added);
};
saveHistoryState(this);
}
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//prototype for undoing canvas changes
function HistoryStateEditCanvas () {
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this.canvasState = currentLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
this.layerID = currentLayer.id;
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this.undo = function () {
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var stateLayer = getLayerByID(this.layerID);
var currentCanvas = stateLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
stateLayer.context.putImageData(this.canvasState, 0, 0);
this.canvasState = currentCanvas;
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redoStates.push(this);
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stateLayer.updateLayerPreview();
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};
this.redo = function () {
console.log("YEET");
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var stateLayer = getLayerByID(this.layerID);
var currentCanvas = stateLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
stateLayer.context.putImageData(this.canvasState, 0, 0);
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this.canvasState = currentCanvas;
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undoStates.push(this);
stateLayer.updateLayerPreview();
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};
//add self to undo array
saveHistoryState(this);
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}
//prototype for undoing added colors
function HistoryStateAddColor (colorValue) {
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this.colorValue = colorValue;
this.undo = function () {
redoStates.push(this);
deleteColor(this.colorValue);
};
this.redo = function () {
addColor(this.colorValue);
undoStates.push(this);
};
//add self to undo array
saveHistoryState(this);
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}
//prototype for undoing deleted colors
function HistoryStateDeleteColor (colorValue) {
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this.colorValue = colorValue;
this.canvas = currentLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
this.undo = function () {
var currentCanvas = currentLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
currentLayer.context.putImageData(this.canvas, 0, 0);
addColor(this.colorValue);
this.canvas = currentCanvas;
redoStates.push(this);
};
this.redo = function () {
var currentCanvas = currentLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
currentLayer.context.putImageData(this.canvas, 0, 0);
deleteColor(this.colorValue);
this.canvas = currentCanvas;
undoStates.push(this);
};
//add self to undo array
saveHistoryState(this);
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}
//prototype for undoing colors edits
function HistoryStateEditColor (newColorValue, oldColorValue) {
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this.newColorValue = newColorValue;
this.oldColorValue = oldColorValue;
this.canvas = currentLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
this.undo = function () {
var currentCanvas = currentLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
currentLayer.context.putImageData(this.canvas, 0, 0);
//find new color in palette and change it back to old color
var colors = document.getElementsByClassName('color-button');
for (var i = 0; i < colors.length; i++) {
//console.log(newColorValue, '==', colors[i].jscolor.toString());
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if (newColorValue == colors[i].jscolor.toString()) {
colors[i].jscolor.fromString(oldColorValue);
break;
}
}
this.canvas = currentCanvas;
redoStates.push(this);
};
this.redo = function () {
var currentCanvas = currentLayer.context.getImageData(0, 0, canvasSize[0], canvasSize[1]);
currentLayer.context.putImageData(this.canvas, 0, 0);
//find old color in palette and change it back to new color
var colors = document.getElementsByClassName('color-button');
for (var i = 0; i < colors.length; i++) {
//console.log(oldColorValue, '==', colors[i].jscolor.toString());
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if (oldColorValue == colors[i].jscolor.toString()) {
colors[i].jscolor.fromString(newColorValue);
break;
}
}
this.canvas = currentCanvas;
undoStates.push(this);
};
//add self to undo array
saveHistoryState(this);
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}
//rename to add undo state
function saveHistoryState (state) {
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//get current canvas data and save to undoStates array
undoStates.push(state);
//limit the number of states to settings.numberOfHistoryStates
if (undoStates.length > settings.numberOfHistoryStates) {
undoStates = undoStates.splice(-settings.numberOfHistoryStates, settings.numberOfHistoryStates);
}
//there is now definitely at least 1 undo state, so the button shouldnt be disabled
document.getElementById('undo-button').classList.remove('disabled');
//there should be no redoStates after an undoState is saved
redoStates = [];
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}
function undo () {
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//if there are any states saved to undo
if (undoStates.length > 0) {
document.getElementById('redo-button').classList.remove('disabled');
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//get state
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var undoState = undoStates[undoStates.length-1];
//console.log(undoState);
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//remove from the undo list
undoStates.splice(undoStates.length-1,1);
//restore the state
undoState.undo();
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//if theres none left to undo, disable the option
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if (undoStates.length == 0)
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document.getElementById('undo-button').classList.add('disabled');
}
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}
function redo () {
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if (redoStates.length > 0) {
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//enable undo button
document.getElementById('undo-button').classList.remove('disabled');
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//get state
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var redoState = redoStates[redoStates.length-1];
//remove from redo array (do this before restoring the state, else the flatten state will break)
redoStates.splice(redoStates.length-1,1);
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//restore the state
redoState.redo();
//if theres none left to redo, disable the option
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if (redoStates.length == 0)
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document.getElementById('redo-button').classList.add('disabled');
}
//console.log(undoStates);
//console.log(redoStates);
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}