source: Dev/trunk/src/client/dojox/mobile/Rating.js

define([
        "dojo/_base/declare",
        "dojo/_base/lang",
        "dojo/dom-construct",
        "dijit/_WidgetBase",
        "./iconUtils"
], function(declare, lang, domConstruct, WidgetBase, iconUtils){

        // module:
        //              dojox/mobile/Rating

        return declare("dojox.mobile.Rating", WidgetBase, {
                // summary:
                //              A widget that displays a rating, usually with stars.
                // description:
                //              This widget simply shows the specified number of stars. It is a
                //              read-only widget, and has no editing capability.

                // image: String
                //              Path to a star image, which includes three stars, full star,
                //              empty star, and half star, from left to right.
                image: "",

                // numStars: Number
                //              The number of stars to show.
                numStars: 5,

                // value: Number
                //              The current value of the Rating.
                value: 0,

                // alt: String
                //              An alternate text for the icon image.
                alt: "",

                /* internal properties */
                
                // baseClass: String
                //              The name of the CSS class of this widget.
                baseClass: "mblRating",

                buildRendering: function(){
                        this.inherited(arguments);
                        this.domNode.style.display = "inline-block";
                        var img = this.imgNode = domConstruct.create("img");
                        this.connect(img, "onload",
                                lang.hitch(this, function(){ this.set("value", this.value); }));
                        iconUtils.createIcon(this.image, null, img);
                },

                _setValueAttr: function(/*Number*/value){
                        // summary:
                        //              Sets the value of the Rating.
                        // tags:
                        //              private
                        this._set("value", value);
                        var h = this.imgNode.height;
                        if(h == 0){ return; } // loading of image has not been completed yet
                        domConstruct.empty(this.domNode);
                        var i, left, w = this.imgNode.width / 3;
                        for(i = 0; i < this.numStars; i++){
                                if(i <= value - 1){
                                        left = 0; // full
                                }else if(i >= value){
                                        left = w; // empty
                                }else{
                                        left = w * 2; // half
                                }
                                var parent = domConstruct.create("div", {
                                        style: {"float": "left"}
                                }, this.domNode);
                                iconUtils.createIcon(this.image,
                                        "0," + left + "," + w + "," + h, null, this.alt, parent);
                        }
                }
        });
});