mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-09-18 10:19:44 +00:00
694ca76e7f
A bit rough and ready, too
319 lines
9.0 KiB
JavaScript
319 lines
9.0 KiB
JavaScript
/*\
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title: $:/core/modules/widgets/edit/editors/bitmapeditor.js
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type: application/javascript
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module-type: editor
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A bitmap editor
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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// Default images sizes
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var DEFAULT_IMAGE_WIDTH = 300,
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DEFAULT_IMAGE_HEIGHT = 185;
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// The elements of the editor UI
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var DOM_CANVAS = 0,
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DOM_WIDTH = 1,
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DOM_HEIGHT = 2;
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var BitmapEditor = function(editWidget,tiddlerTitle,fieldName) {
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this.editWidget = editWidget;
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this.tiddlerTitle = tiddlerTitle;
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this.fieldName = fieldName;
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};
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BitmapEditor.prototype.render = function() {
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// Set the element details
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this.editWidget.tag = "div";
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this.editWidget.attributes = {
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"class": "tw-edit-bitmapeditor-wrapper"
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};
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var children = [{
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type: "element",
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tag: "canvas",
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attributes: {
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"class": {type: "string", value: "tw-edit-bitmapeditor"}
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},
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events: [{
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name: "touchstart",
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handlerObject: this,
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handlerMethod: "handleTouchStartEvent"
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},{
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name: "touchmove",
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handlerObject: this,
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handlerMethod: "handleTouchMoveEvent"
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},{
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name: "touchend",
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handlerObject: this,
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handlerMethod: "handleTouchEndEvent"
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},{
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name: "mousedown",
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handlerObject: this,
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handlerMethod: "handleMouseDownEvent"
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},{
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name: "mousemove",
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handlerObject: this,
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handlerMethod: "handleMouseMoveEvent"
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},{
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name: "mouseup",
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handlerObject: this,
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handlerMethod: "handleMouseUpEvent"
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}]
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},{
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type: "element",
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tag: "input",
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attributes: {
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"class": {type: "string", value: "tw-edit-bitmapeditor-width"},
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"type": {type: "string", value: "number"},
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"value": {type: "string", value: ""}
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},
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events: [{
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name: "change",
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handlerObject: this,
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handlerMethod: "handleWidthChangeEvent"
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}]
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},{
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type: "element",
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tag: "input",
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attributes: {
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"class": {type: "string", value: "tw-edit-bitmapeditor-height"},
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"type": {type: "string", value: "number"},
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"value": {type: "string", value: ""}
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},
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events: [{
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name: "change",
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handlerObject: this,
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handlerMethod: "handleHeightChangeEvent"
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}]
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}];
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this.editWidget.children = this.editWidget.renderer.renderTree.createRenderers(this.editWidget.renderer,children);
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};
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BitmapEditor.prototype.postRenderInDom = function() {
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var tiddler = this.editWidget.renderer.renderTree.wiki.getTiddler(this.tiddlerTitle),
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canvas = this.getDomNode(DOM_CANVAS),
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currImage = new Image();
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// Set up event handlers for loading the image
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var self = this;
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currImage.onload = function() {
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// Copy the image to the on-screen canvas
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self.initCanvas(canvas,currImage.width,currImage.height,currImage);
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// And also copy the current bitmap to the off-screen canvas
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self.currCanvas = self.editWidget.renderer.renderTree.document.createElement("canvas");
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self.initCanvas(self.currCanvas,currImage.width,currImage.height,currImage);
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// Set the width and height input boxes
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self.updateSize();
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};
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currImage.onerror = function() {
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// Set the on-screen canvas size and clear it
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self.initCanvas(canvas,DEFAULT_IMAGE_WIDTH,DEFAULT_IMAGE_HEIGHT);
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// Set the off-screen canvas size and clear it
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self.currCanvas = self.editWidget.renderer.renderTree.document.createElement("canvas");
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self.initCanvas(self.currCanvas,DEFAULT_IMAGE_WIDTH,DEFAULT_IMAGE_HEIGHT);
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// Set the width and height input boxes
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self.updateSize();
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}
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// Get the current bitmap into an image object
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currImage.src = "data:" + tiddler.fields.type + ";base64," + tiddler.fields.text;
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};
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BitmapEditor.prototype.initCanvas = function(canvas,width,height,image) {
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canvas.width = width;
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canvas.height = height;
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var ctx = canvas.getContext("2d");
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if(image) {
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ctx.drawImage(image,0,0);
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} else {
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ctx.fillStyle = "#fff";
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ctx.fillRect(0,0,canvas.width,canvas.height);
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}
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}
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BitmapEditor.prototype.getDomNode = function(index) {
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return this.editWidget.renderer.domNode.childNodes[index];
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};
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/*
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** Update the input boxes with the actual size of the canvas
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*/
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BitmapEditor.prototype.updateSize = function() {
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this.getDomNode(DOM_WIDTH).value = this.currCanvas.width;
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this.getDomNode(DOM_HEIGHT).value = this.currCanvas.height;
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};
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/*
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** Change the size of the canvas, preserving the current image
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*/
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BitmapEditor.prototype.changeCanvasSize = function(newWidth,newHeight) {
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// Create and size a new canvas
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var newCanvas = this.editWidget.renderer.renderTree.document.createElement("canvas");
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this.initCanvas(newCanvas,newWidth,newHeight);
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// Copy the old image
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var ctx = newCanvas.getContext("2d");
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ctx.drawImage(this.currCanvas,0,0);
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// Set the new canvas as the current one
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this.currCanvas = newCanvas;
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// Set the size of the onscreen canvas
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var canvas = this.getDomNode(DOM_CANVAS);
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canvas.width = newWidth;
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canvas.height = newHeight;
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// Paint the onscreen canvas with the offscreen canvas
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ctx = canvas.getContext("2d");
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ctx.drawImage(this.currCanvas,0,0);
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};
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BitmapEditor.prototype.handleWidthChangeEvent = function(event) {
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// Get the new width
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var newWidth = parseInt(this.getDomNode(DOM_WIDTH).value,10);
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// Update if necessary
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if(newWidth > 0 && newWidth !== this.currCanvas.width) {
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this.changeCanvasSize(newWidth,this.currCanvas.height);
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}
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// Update the input controls
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this.updateSize();
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};
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BitmapEditor.prototype.handleHeightChangeEvent = function(event) {
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// Get the new width
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var newHeight = parseInt(this.getDomNode(DOM_HEIGHT).value,10);
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// Update if necessary
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if(newHeight > 0 && newHeight !== this.currCanvas.height) {
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this.changeCanvasSize(this.currCanvas.width,newHeight);
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}
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// Update the input controls
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this.updateSize();
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};
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BitmapEditor.prototype.handleTouchStartEvent = function(event) {
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this.brushDown = true;
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this.strokeStart(event.touches[0].clientX,event.touches[0].clientY);
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event.preventDefault();
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event.stopPropagation();
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return false;
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};
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BitmapEditor.prototype.handleTouchMoveEvent = function(event) {
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if(this.brushDown) {
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this.strokeMove(event.touches[0].clientX,event.touches[0].clientY);
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}
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event.preventDefault();
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event.stopPropagation();
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return false;
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};
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BitmapEditor.prototype.handleTouchEndEvent = function(event) {
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if(this.brushDown) {
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this.brushDown = false;
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this.strokeEnd();
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}
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event.preventDefault();
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event.stopPropagation();
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return false;
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};
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BitmapEditor.prototype.handleMouseDownEvent = function(event) {
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this.strokeStart(event.clientX,event.clientY);
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this.brushDown = true;
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event.preventDefault();
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event.stopPropagation();
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return false;
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};
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BitmapEditor.prototype.handleMouseMoveEvent = function(event) {
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if(this.brushDown) {
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this.strokeMove(event.clientX,event.clientY);
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event.preventDefault();
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event.stopPropagation();
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return false;
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}
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return true;
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};
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BitmapEditor.prototype.handleMouseUpEvent = function(event) {
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if(this.brushDown) {
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this.brushDown = false;
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this.strokeEnd();
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event.preventDefault();
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event.stopPropagation();
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return false;
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}
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return true;
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};
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BitmapEditor.prototype.adjustCoordinates = function(x,y) {
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var canvas = this.getDomNode(DOM_CANVAS),
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canvasRect = canvas.getBoundingClientRect(),
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scale = canvas.width/canvasRect.width;
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return {x: (x - canvasRect.left) * scale, y: (y - canvasRect.top) * scale};
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};
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BitmapEditor.prototype.strokeStart = function(x,y) {
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// Start off a new stroke
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this.stroke = [this.adjustCoordinates(x,y)];
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};
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BitmapEditor.prototype.strokeMove = function(x,y) {
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var canvas = this.getDomNode(DOM_CANVAS),
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ctx = canvas.getContext("2d"),
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t;
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// Add the new position to the end of the stroke
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this.stroke.push(this.adjustCoordinates(x,y));
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// Redraw the previous image
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ctx.drawImage(this.currCanvas,0,0);
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// Render the stroke
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ctx.strokeStyle = "#ff0";
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ctx.lineWidth = 3;
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ctx.lineCap = "round";
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ctx.lineJoin = "round";
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ctx.beginPath();
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ctx.moveTo(this.stroke[0].x,this.stroke[0].y);
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for(t=1; t<this.stroke.length-1; t++) {
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var s1 = this.stroke[t],
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s2 = this.stroke[t-1],
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tx = (s1.x + s2.x)/2,
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ty = (s1.y + s2.y)/2;
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ctx.quadraticCurveTo(s2.x,s2.y,tx,ty);
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}
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ctx.stroke();
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};
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BitmapEditor.prototype.strokeEnd = function() {
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// Copy the bitmap to the off-screen canvas
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var canvas = this.getDomNode(DOM_CANVAS),
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ctx = this.currCanvas.getContext("2d");
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ctx.drawImage(canvas,0,0);
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// Save the image into the tiddler
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this.saveChanges();
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};
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BitmapEditor.prototype.saveChanges = function() {
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var tiddler = this.editWidget.renderer.renderTree.wiki.getTiddler(this.tiddlerTitle);
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if(tiddler) {
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// data URIs look like "data:<type>;base64,<text>"
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var dataURL = this.getDomNode(DOM_CANVAS).toDataURL(tiddler.fields.type,1.0),
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posColon = dataURL.indexOf(":"),
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posSemiColon = dataURL.indexOf(";"),
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posComma = dataURL.indexOf(","),
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type = dataURL.substring(posColon+1,posSemiColon),
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text = dataURL.substring(posComma+1);
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var update = {type: type, text: text};
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this.editWidget.renderer.renderTree.wiki.addTiddler(new $tw.Tiddler(tiddler,update));
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}
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};
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/*
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Note that the bitmap editor intentionally doesn't have a refreshInDom method to avoid the situation where a bitmap being editted is modified externally
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*/
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exports["image/jpg"] = BitmapEditor;
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exports["image/jpeg"] = BitmapEditor;
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exports["image/png"] = BitmapEditor;
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exports["image/gif"] = BitmapEditor;
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})();
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