130 lines
3.4 KiB
JavaScript
130 lines
3.4 KiB
JavaScript
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dojo.provide("dojox.image.MagnifierLite");
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dojo.experimental("dojox.image.MagnifierLite");
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dojo.require("dijit._Widget");
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dojo.declare("dojox.image.MagnifierLite", dijit._Widget,
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{
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// summary: Adds magnification on a portion of an image element
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//
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// description: 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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// The logic behind requiring the src image to be large is
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// "it's going to be downloaded, anyway" so this method avoids
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// having to make thumbnails and 2 http requests among other things.
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//
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// glassSize: Int
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// the width and height of the bounding box
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glassSize: 125,
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// scale: Decimal
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// the multiplier of the Mangification.
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scale: 6,
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postCreate: function(){
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this.inherited(arguments);
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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._adjustScale();
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this._createGlass();
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this.connect(this.domNode,"onmouseenter","_showGlass");
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this.connect(this.glassNode,"onmousemove","_placeGlass");
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this.connect(this.img,"onmouseout","_hideGlass");
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// when position of domNode changes, _adjustScale needs to run.
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// window.resize isn't it always, FIXME:
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this.connect(window,"onresize","_adjustScale");
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},
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_createGlass: function(){
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// summary: make img and glassNode elements as children of the body
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var node = this.glassNode = dojo.doc.createElement('div');
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this.surfaceNode = node.appendChild(dojo.doc.createElement('div'));
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dojo.addClass(node,"glassNode");
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dojo.body().appendChild(node);
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dojo.style(node,{
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height: this.glassSize + "px",
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width: this.glassSize + "px"
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});
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this.img = dojo.clone(this.domNode);
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node.appendChild(this.img);
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// float the image around inside the .glassNode
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dojo.style(this.img, {
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position: "relative",
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top: 0,
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left: 0,
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width: this._zoomSize.w + "px",
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height: this._zoomSize.h + "px"
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});
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},
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_adjustScale: function(){
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// summary: update the calculations should this.scale change
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this.offset = dojo.coords(this.domNode, true);
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this._imageSize = { w: this.offset.w, h:this.offset.h };
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this._zoomSize = {
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w: this._imageSize.w * this.scale,
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h: this._imageSize.h * this.scale
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};
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},
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_showGlass: function(e){
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// summary: show the overlay
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this._placeGlass(e);
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dojo.style(this.glassNode, {
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visibility: "visible",
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display:""
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});
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},
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_hideGlass: function(e){
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// summary: hide the overlay
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dojo.style(this.glassNode, {
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visibility: "hidden",
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display:"none"
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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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this._setImage(e);
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var sub = Math.floor(this.glassSize / 2);
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dojo.style(this.glassNode,{
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top: Math.floor(e.pageY - sub) + "px",
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left:Math.floor(e.pageX - sub) + "px"
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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.l) / this.offset.w;
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var yOff = (e.pageY - this.offset.t) / this.offset.h;
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var x = (this._zoomSize.w * xOff * -1) + (this.glassSize * xOff);
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var y = (this._zoomSize.h * yOff * -1) + (this.glassSize * yOff);
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dojo.style(this.img, {
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top: y + "px",
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left: x + "px"
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});
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},
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destroy: function(finalize){
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dojo.destroy(this.glassNode);
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this.inherited(arguments);
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}
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});
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