mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-04 17:16:18 +00:00
313 lines
9.1 KiB
JavaScript
313 lines
9.1 KiB
JavaScript
/*\
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title: $:/core/modules/new_widgets/edit-bitmap.js
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type: application/javascript
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module-type: new_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 $tw: false */
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"use strict";
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// Default image sizes
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var DEFAULT_IMAGE_WIDTH = 300,
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DEFAULT_IMAGE_HEIGHT = 185;
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var Widget = require("$:/core/modules/new_widgets/widget.js").widget;
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var EditBitmapWidget = function(parseTreeNode,options) {
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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 our element
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this.canvasDomNode = $tw.utils.domMaker("canvas",{
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document: this.document,
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"class":"tw-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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this.widthDomNode = $tw.utils.domMaker("input",{
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document: this.document,
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"class":"tw-edit-bitmapeditor-width",
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eventListeners: [{
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name: "change", handlerObject: this, handlerMethod: "handleWidthChangeEvent"
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}]
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});
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this.heightDomNode = $tw.utils.domMaker("input",{
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document: this.document,
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"class":"tw-edit-bitmapeditor-height",
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eventListeners: [{
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name: "change", handlerObject: this, handlerMethod: "handleHeightChangeEvent"
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}]
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});
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// Insert the elements into the DOM
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parent.insertBefore(this.canvasDomNode,nextSibling);
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parent.insertBefore(this.widthDomNode,nextSibling);
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parent.insertBefore(this.heightDomNode,nextSibling);
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this.domNodes.push(this.canvasDomNode,this.widthDomNode,this.heightDomNode);
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// Load the image into the canvas
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this.loadCanvas();
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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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};
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/*
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Note that the bitmap editor intentionally doesn't try to refresh itself because it would be confusing to have the image changing spontaneously while editting it
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*/
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EditBitmapWidget.prototype.refresh = function(changedTiddlers) {
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return false;
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};
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/*
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Remove any DOM nodes created by this widget or its children
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*/
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EditBitmapWidget.prototype.removeChildDomNodes = function() {
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$tw.utils.each(this.domNodes,function(domNode) {
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domNode.parentNode.removeChild(domNode);
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});
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this.domNodes = [];
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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.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(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.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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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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** Update the input boxes with the actual size of the canvas
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*/
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EditBitmapWidget.prototype.updateSize = function() {
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this.widthDomNode.value = this.currCanvas.width;
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this.heightDomNode.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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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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EditBitmapWidget.prototype.handleWidthChangeEvent = function(event) {
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// Get the new width
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var newWidth = parseInt(this.widthDomNode.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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EditBitmapWidget.prototype.handleHeightChangeEvent = function(event) {
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// Get the new width
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var newHeight = parseInt(this.heightDomNode.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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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.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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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);
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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.canvasDomNode.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.wiki.addTiddler(new $tw.Tiddler(tiddler,update));
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}
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};
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exports["edit-bitmap"] = EditBitmapWidget;
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})();
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