71 lines
2.4 KiB
JavaScript
71 lines
2.4 KiB
JavaScript
//>>built
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define("dojox/image/Magnifier", ["dojo/_base/declare", "dojo/dom-construct", "dojo/_base/window", "dojox/gfx", "dojox/gfx/canvas", "./MagnifierLite"], function(declare, construct, window, gfx, canvas, MagnifierLite){
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return declare("dojox.image.Magnifier", MagnifierLite, {
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// summary:
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// Adds magnification on a portion of an image element, using `dojox.gfx`
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//
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// description:
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// An unobtrusive way to add an unstyled overlay
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// above the srcNode image element. The overlay/glass is a
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// scaled version of the src image (so larger images sized down
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// are clearer).
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//
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// over-ride the _createGlass method to create your custom surface,
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// being sure to create an img node on that surface.
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_createGlass: function(){
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// summary: create the glassNode, and an img on a dojox.gfx surface
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// images are hard to make into workable templates, so just add outer overlay
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// and skip using dijit._Templated
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this.glassNode = construct.create('div', {
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style: {
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height: this.glassSize + "px",
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width: this.glassSize + "px"
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},
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className: "glassNode"
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}, window.body());
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this.surfaceNode = construct.create('div', null, this.glassNode);
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gfx.switchTo('canvas');
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this.surface = canvas.createSurface(this.surfaceNode, this.glassSize, this.glassSize);
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this.img = this.surface.createImage({
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src: this.domNode.src,
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width: this._zoomSize.w,
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height: this._zoomSize.h
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});
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},
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_placeGlass: function(e){
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// summary: position the overlay centered under the cursor
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var x = e.pageX - 2,
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y = e.pageY - 2,
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xMax = this.offset.x + this.offset.w + 2,
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yMax = this.offset.y + this.offset.h + 2
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;
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// with svg, our mouseout connection to the image surface doesn't
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// fire, so we'r have to manually calculate offsets
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if(x < this.offset.x || y < this.offset.y || x > xMax || y > yMax){
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this._hideGlass();
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}else{
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this.inherited(arguments);
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}
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},
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_setImage: function(e){
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// summary: set the image's offset in the clipping window relative to the mouse position
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var xOff = (e.pageX - this.offset.x) / this.offset.w,
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yOff = (e.pageY - this.offset.y) / this.offset.h,
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x = (this._zoomSize.w * xOff * -1)+(this.glassSize*xOff),
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y = (this._zoomSize.h * yOff * -1)+(this.glassSize*yOff)
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;
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// set the image offset
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this.img.setShape({ x: x, y: y });
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}
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});
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}); |