mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-27 03:57:21 +00:00
Improve the bitmap editor to allow the bitmap to be resized
A bit rough and ready, too
This commit is contained in:
Jeremy Ruston
parent
6ae73e0fc7
commit
694ca76e7f
@ -12,8 +12,14 @@ A bitmap editor
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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 = 182;
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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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@ -58,13 +64,39 @@ BitmapEditor.prototype.render = function() {
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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.editWidget.renderer.domNode.firstChild,
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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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@ -74,6 +106,8 @@ BitmapEditor.prototype.postRenderInDom = function() {
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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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@ -81,6 +115,8 @@ BitmapEditor.prototype.postRenderInDom = function() {
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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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@ -98,6 +134,61 @@ BitmapEditor.prototype.initCanvas = function(canvas,width,height,image) {
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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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@ -155,7 +246,7 @@ BitmapEditor.prototype.handleMouseUpEvent = function(event) {
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};
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BitmapEditor.prototype.adjustCoordinates = function(x,y) {
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var canvas = this.editWidget.renderer.domNode.firstChild,
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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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@ -167,7 +258,7 @@ BitmapEditor.prototype.strokeStart = function(x,y) {
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};
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BitmapEditor.prototype.strokeMove = function(x,y) {
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var canvas = this.editWidget.renderer.domNode.firstChild,
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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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@ -193,7 +284,7 @@ BitmapEditor.prototype.strokeMove = function(x,y) {
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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.editWidget.renderer.domNode.firstChild,
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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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@ -204,7 +295,7 @@ 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.editWidget.renderer.domNode.firstChild.toDataURL(tiddler.fields.type,1.0),
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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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@ -453,6 +453,14 @@ canvas.tw-edit-bitmapeditor {
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-ms-user-select: none;
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}
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.tw-edit-bitmapeditor-width {
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display: block;
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}
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.tw-edit-bitmapeditor-height {
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display: block;
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}
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/*
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** Tiddler edit mode
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*/
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