| 1 | define(["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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| 2 | |
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| 3 | return declare("dojox.image.Magnifier", MagnifierLite, { |
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| 4 | // summary: |
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| 5 | // Adds magnification on a portion of an image element, using `dojox.gfx` |
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| 6 | // |
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| 7 | // description: |
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| 8 | // An unobtrusive way to add an unstyled overlay |
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| 9 | // above the srcNode image element. The overlay/glass is a |
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| 10 | // scaled version of the src image (so larger images sized down |
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| 11 | // are clearer). |
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| 12 | // |
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| 13 | // over-ride the _createGlass method to create your custom surface, |
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| 14 | // being sure to create an img node on that surface. |
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| 15 | |
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| 16 | _createGlass: function(){ |
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| 17 | // summary: create the glassNode, and an img on a dojox.gfx surface |
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| 18 | |
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| 19 | // images are hard to make into workable templates, so just add outer overlay |
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| 20 | // and skip using dijit._Templated |
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| 21 | this.glassNode = construct.create('div', { |
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| 22 | style: { |
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| 23 | height: this.glassSize + "px", |
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| 24 | width: this.glassSize + "px" |
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| 25 | }, |
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| 26 | className: "glassNode" |
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| 27 | }, window.body()); |
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| 28 | this.surfaceNode = construct.create('div', null, this.glassNode); |
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| 29 | |
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| 30 | gfx.switchTo('canvas'); |
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| 31 | this.surface = canvas.createSurface(this.surfaceNode, this.glassSize, this.glassSize); |
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| 32 | this.img = this.surface.createImage({ |
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| 33 | src: this.domNode.src, |
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| 34 | width: this._zoomSize.w, |
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| 35 | height: this._zoomSize.h |
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| 36 | }); |
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| 37 | |
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| 38 | }, |
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| 39 | |
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| 40 | _placeGlass: function(e){ |
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| 41 | // summary: position the overlay centered under the cursor |
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| 42 | var x = e.pageX - 2, |
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| 43 | y = e.pageY - 2, |
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| 44 | xMax = this.offset.x + this.offset.w + 2, |
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| 45 | yMax = this.offset.y + this.offset.h + 2 |
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| 46 | ; |
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| 47 | |
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| 48 | // with svg, our mouseout connection to the image surface doesn't |
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| 49 | // fire, so we'r have to manually calculate offsets |
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| 50 | if(x < this.offset.x || y < this.offset.y || x > xMax || y > yMax){ |
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| 51 | this._hideGlass(); |
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| 52 | }else{ |
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| 53 | this.inherited(arguments); |
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| 54 | } |
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| 55 | }, |
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| 56 | |
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| 57 | _setImage: function(e){ |
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| 58 | // summary: set the image's offset in the clipping window relative to the mouse position |
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| 59 | |
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| 60 | var xOff = (e.pageX - this.offset.x) / this.offset.w, |
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| 61 | yOff = (e.pageY - this.offset.y) / this.offset.h, |
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| 62 | x = (this._zoomSize.w * xOff * -1)+(this.glassSize*xOff), |
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| 63 | y = (this._zoomSize.h * yOff * -1)+(this.glassSize*yOff) |
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| 64 | ; |
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| 65 | // set the image offset |
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| 66 | this.img.setShape({ x: x, y: y }); |
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| 67 | |
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| 68 | } |
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| 69 | }); |
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| 70 | }); |
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