pixel-editor/js/_history.js
npalomba a9d380ec1d Implemented eraser tool. Must move and resize layers at the same time.
Signed-off-by: npalomba <nicola.palomba@studenti.galileilivorno.gov.it>
2019-03-31 16:32:49 +02:00

198 lines
5.6 KiB
JavaScript

var undoStates = [];
var redoStates = [];
const undoLogStyle = 'background: #87ff1c; color: black; padding: 5px;';
//prototype for undoing canvas changes
function HistoryStateEditCanvas () {
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);
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);
this.canvas = currentCanvas;
undoStates.push(this);
}
//add self to undo array
saveHistoryState(this);
}
//prototype for undoing added colors
function HistoryStateAddColor (colorValue) {
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);
}
//prototype for undoing deleted colors
function HistoryStateDeleteColor (colorValue) {
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);
}
//prototype for undoing colors edits
function HistoryStateEditColor (newColorValue, oldColorValue) {
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())
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())
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);
}
//rename to add undo state
function saveHistoryState (state) {
console.log('%csaving history state', undoLogStyle)
console.log(state)
//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 = [];
console.log(undoStates)
console.log(redoStates)
}
function undo () {
console.log('%cundo', undoLogStyle);
//if there are any states saved to undo
if (undoStates.length > 0) {
document.getElementById('redo-button').classList.remove('disabled');
//get state
var undoState = undoStates[undoStates.length-1];
console.log(undoState);
//restore the state
undoState.undo();
//remove from the undo list
undoStates.splice(undoStates.length-1,1);
//if theres none left to undo, disable the option
if (undoStates.length == 0)
document.getElementById('undo-button').classList.add('disabled');
}
console.log(undoStates)
console.log(redoStates)
}
function redo () {
console.log('%credo', undoLogStyle);
if (redoStates.length > 0) {
//enable undo button
document.getElementById('undo-button').classList.remove('disabled');
//get state
var redoState = redoStates[redoStates.length-1];
console.log(redoState);
//restore the state
redoState.redo();
//remove from redo array
redoStates.splice(redoStates.length-1,1);
//if theres none left to redo, disable the option
if (redoStates.length == 0)
document.getElementById('redo-button').classList.add('disabled');
}
console.log(undoStates)
console.log(redoStates)
}