mirror of
https://github.com/Jermolene/TiddlyWiki5
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344 lines
11 KiB
JavaScript
344 lines
11 KiB
JavaScript
/*\
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title: $:/core/modules/widgets/edit-bitmap.js
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type: application/javascript
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module-type: widget
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Edit-bitmap widget
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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// Default image sizes
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var DEFAULT_IMAGE_WIDTH = 600,
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DEFAULT_IMAGE_HEIGHT = 370,
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DEFAULT_IMAGE_TYPE = "image/png";
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// Configuration tiddlers
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var LINE_WIDTH_TITLE = "$:/config/BitmapEditor/LineWidth",
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LINE_COLOUR_TITLE = "$:/config/BitmapEditor/Colour",
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LINE_OPACITY_TITLE = "$:/config/BitmapEditor/Opacity";
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var Widget = require("$:/core/modules/widgets/widget.js").widget;
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var EditBitmapWidget = function(parseTreeNode,options) {
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// Initialise the editor operations if they've not been done already
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if(!this.editorOperations) {
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EditBitmapWidget.prototype.editorOperations = {};
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$tw.modules.applyMethods("bitmapeditoroperation",this.editorOperations);
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}
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this.initialise(parseTreeNode,options);
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};
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/*
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Inherit from the base widget class
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*/
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EditBitmapWidget.prototype = new Widget();
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/*
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Render this widget into the DOM
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*/
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EditBitmapWidget.prototype.render = function(parent,nextSibling) {
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var self = this;
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// Save the parent dom node
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this.parentDomNode = parent;
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// Compute our attributes
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this.computeAttributes();
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// Execute our logic
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this.execute();
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// Create the wrapper for the toolbar and render its content
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this.toolbarNode = this.document.createElement("div");
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this.toolbarNode.className = "tc-editor-toolbar";
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parent.insertBefore(this.toolbarNode,nextSibling);
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this.domNodes.push(this.toolbarNode);
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// Create the on-screen canvas
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this.canvasDomNode = $tw.utils.domMaker("canvas",{
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document: this.document,
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"class":"tc-edit-bitmapeditor",
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eventListeners: [{
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name: "touchstart", handlerObject: this, handlerMethod: "handleTouchStartEvent"
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},{
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name: "touchmove", handlerObject: this, handlerMethod: "handleTouchMoveEvent"
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},{
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name: "touchend", handlerObject: this, handlerMethod: "handleTouchEndEvent"
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},{
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name: "mousedown", handlerObject: this, handlerMethod: "handleMouseDownEvent"
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},{
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name: "mousemove", handlerObject: this, handlerMethod: "handleMouseMoveEvent"
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},{
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name: "mouseup", handlerObject: this, handlerMethod: "handleMouseUpEvent"
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}]
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});
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// Set the width and height variables
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this.setVariable("tv-bitmap-editor-width",this.canvasDomNode.width + "px");
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this.setVariable("tv-bitmap-editor-height",this.canvasDomNode.height + "px");
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// Render toolbar child widgets
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this.renderChildren(this.toolbarNode,null);
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// // Insert the elements into the DOM
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parent.insertBefore(this.canvasDomNode,nextSibling);
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this.domNodes.push(this.canvasDomNode);
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// Load the image into the canvas
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if($tw.browser) {
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this.loadCanvas();
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}
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// Add widget message listeners
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this.addEventListeners([
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{type: "tm-edit-bitmap-operation", handler: "handleEditBitmapOperationMessage"}
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]);
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};
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/*
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Handle an edit bitmap operation message from the toolbar
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*/
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EditBitmapWidget.prototype.handleEditBitmapOperationMessage = function(event) {
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// Invoke the handler
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var handler = this.editorOperations[event.param];
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if(handler) {
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handler.call(this,event);
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}
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};
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/*
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Compute the internal state of the widget
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*/
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EditBitmapWidget.prototype.execute = function() {
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// Get our parameters
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this.editTitle = this.getAttribute("tiddler",this.getVariable("currentTiddler"));
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// Make the child widgets
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this.makeChildWidgets();
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};
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/*
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Just refresh the toolbar
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*/
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EditBitmapWidget.prototype.refresh = function(changedTiddlers) {
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return this.refreshChildren(changedTiddlers);
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};
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/*
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Set the bitmap size variables and refresh the toolbar
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*/
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EditBitmapWidget.prototype.refreshToolbar = function() {
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// Set the width and height variables
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this.setVariable("tv-bitmap-editor-width",this.canvasDomNode.width + "px");
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this.setVariable("tv-bitmap-editor-height",this.canvasDomNode.height + "px");
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// Refresh each of our child widgets
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$tw.utils.each(this.children,function(childWidget) {
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childWidget.refreshSelf();
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});
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};
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EditBitmapWidget.prototype.loadCanvas = function() {
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var tiddler = this.wiki.getTiddler(this.editTitle),
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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(self.canvasDomNode,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.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.refreshToolbar();
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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(self.canvasDomNode,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.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.refreshToolbar();
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};
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// Get the current bitmap into an image object
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if(tiddler && tiddler.fields.type && tiddler.fields.text) {
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currImage.src = "data:" + tiddler.fields.type + ";base64," + tiddler.fields.text;
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} else {
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currImage.width = DEFAULT_IMAGE_WIDTH;
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currImage.height = DEFAULT_IMAGE_HEIGHT;
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currImage.onerror();
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}
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};
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EditBitmapWidget.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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/*
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** Change the size of the canvas, preserving the current image
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*/
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EditBitmapWidget.prototype.changeCanvasSize = function(newWidth,newHeight) {
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// Create and size a new canvas
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var newCanvas = this.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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this.canvasDomNode.width = newWidth;
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this.canvasDomNode.height = newHeight;
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// Paint the onscreen canvas with the offscreen canvas
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ctx = this.canvasDomNode.getContext("2d");
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ctx.drawImage(this.currCanvas,0,0);
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};
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/*
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** Rotate the canvas left by 90 degrees
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*/
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EditBitmapWidget.prototype.rotateCanvasLeft = function() {
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// Get the current size of the image
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var origWidth = this.currCanvas.width,
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origHeight = this.currCanvas.height;
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// Create and size a new canvas
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var newCanvas = this.document.createElement("canvas"),
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newWidth = origHeight,
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newHeight = origWidth;
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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.save();
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ctx.translate(newWidth / 2,newHeight / 2);
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ctx.rotate(-Math.PI / 2);
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ctx.drawImage(this.currCanvas,-origWidth / 2,-origHeight / 2);
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ctx.restore();
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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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this.canvasDomNode.width = newWidth;
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this.canvasDomNode.height = newHeight;
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// Paint the onscreen canvas with the offscreen canvas
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ctx = this.canvasDomNode.getContext("2d");
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ctx.drawImage(this.currCanvas,0,0);
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};
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EditBitmapWidget.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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EditBitmapWidget.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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EditBitmapWidget.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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EditBitmapWidget.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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EditBitmapWidget.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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EditBitmapWidget.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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EditBitmapWidget.prototype.adjustCoordinates = function(x,y) {
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var canvasRect = this.canvasDomNode.getBoundingClientRect(),
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scale = this.canvasDomNode.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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EditBitmapWidget.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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EditBitmapWidget.prototype.strokeMove = function(x,y) {
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var ctx = this.canvasDomNode.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.globalAlpha = parseFloat(this.wiki.getTiddlerText(LINE_OPACITY_TITLE,"1.0"));
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ctx.strokeStyle = this.wiki.getTiddlerText(LINE_COLOUR_TITLE,"#ff0");
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ctx.lineWidth = parseFloat(this.wiki.getTiddlerText(LINE_WIDTH_TITLE,"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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EditBitmapWidget.prototype.strokeEnd = function() {
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// Copy the bitmap to the off-screen canvas
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var ctx = this.currCanvas.getContext("2d");
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ctx.drawImage(this.canvasDomNode,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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EditBitmapWidget.prototype.saveChanges = function() {
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var tiddler = this.wiki.getTiddler(this.editTitle) || new $tw.Tiddler({title: this.editTitle,type: DEFAULT_IMAGE_TYPE});
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// data URIs look like "data:<type>;base64,<text>"
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var dataURL = this.canvasDomNode.toDataURL(tiddler.fields.type),
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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.wiki.addTiddler(new $tw.Tiddler(this.wiki.getModificationFields(),tiddler,update,this.wiki.getCreationFields()));
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};
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exports["edit-bitmap"] = EditBitmapWidget;
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})();
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