source: Dev/trunk/src/client/dojox/fx/Timeline.js

define(["dojo/_base/lang","dojo/fx/easing","dojo/_base/fx","dojo/dom","./_base","dojo/_base/connect",
                "dojo/_base/html", "dojo/_base/array","dojo/_base/Color"],
 function(lang, easingUtil, baseFx, dom, dojoxFx, connectUtil, htmlUtil, arrayUtil, Color){

dojoxFx.animateTimeline = function(options, node){
        // summary:
        //              An add-on to dojo.fx that provides the ability to create
        //              a complex property animation based on an array of "keyframes".
        // description:
        //              The Timeline is a replacement for the default dojo._Line.
        //              Instead of _Line.getValue returning a float between 0-1,
        //              _Timeline.getValue returns an object with all properties and
        //              their current values.
        //              A property does not have to appear in every keyframe.
        //              As in the example below, "height" is transitioned from the first
        //              keyframe to the third. "width" is transitioned from the first
        //              to the second to the third.
        //              Each keyframe can accept the following custom properties:
        //
        //              - step: String:
        //                The start, finish or percentage that this keyframe represents.
        //                Allowed parameters are:
        //                      - 0%-100%
        //                      - from (same as 0%, used to conform with the Webkit animation spec)
        //                      - to (same as 100%, used to conform with the Webkit animation spec)
        //              - ease: String:
        //                The string name of a dojo.fx.easing ease. Defaults to "linear". Use
        //                the suffix name of the ease, like: "quadIn", not: "dojo.fx.quadIn".
        // options: Object
        //              The parameters passed to the timeline animation. Includes:
        //
        //              - keys: Array: An array of objects, with style properties and values.
        //              - duration: Duration of the animation in milliseconds.  Defaults to 1000.
        // node: DomNode|String
        //              The DomNode or id to be animated.
        // example:
        //      |       var keys = [
        //      |       {
        //      |               step:"0px",
        //      |               ease:"quadInOut",
        //      |               width:"50px",
        //      |               height:"50px",
        //      |       },{
        //      |               step:"25%",
        //      |               width:"190px"
        //      |       },{
        //      |               step:"100%",
        //      |               width:"10px",
        //      |               height:"200px",
        //      |       }
        //      |       ];
        //      |       ani = dojox.fx.animateTimeline({keys:keys, duration:2000}, "myDiv").play();

        var _curve = new Timeline(options.keys);
        var ani = baseFx.animateProperty({
                node:dom.byId(node || options.node),
                duration:options.duration || 1000,
                properties:_curve._properties,
                // don't change! This easing is for the timeline,
                // not individual properties
                easing:easingUtil.linear,
                onAnimate: function(v){
                        //console.log("   ani:", v);
                }
        });
        connectUtil.connect(ani, "onEnd", function(node){
                // Setting the final style. Hiccups in the browser
                // can cause the animation to lose track. This ensures
                // that it finishes in the proper location.
                var sty = ani.curve.getValue(ani.reversed ? 0 : 1);
                htmlUtil.style(node, sty);
        });
        connectUtil.connect(ani, "beforeBegin", function(){
                // remove default curve and replace it with Timeline
                if(ani.curve){ delete ani.curve; }
                ani.curve = _curve;
                _curve.ani = ani;
        })
        return ani; // dojo.Animation
};

var Timeline = function(/* Array */keys){
        // summary:
        //              The dojox.fx._Timeline object from which an instance
        //              is created
        // tags:
        //              private
        this.keys = lang.isArray(keys) ? this.flatten(keys) : keys;
};

Timeline.prototype.flatten = function(keys){
        // summary:
        //              An internally used function that converts the keyframes
        //              as used in the example above into a series of key values
        //              which is what is used in the animation parsing.
        var getPercent = function(str, idx){
                if(str == "from"){ return 0; }
                if(str == "to"){ return 1; }
                if(str === undefined){
                        return idx==0 ? 0 : idx / (keys.length - 1)
                }
                return parseInt(str, 10) * .01
        };
        var p = {}, o = {};
        arrayUtil.forEach(keys, function(k, i){
                var step = getPercent(k.step, i);
                var ease = easingUtil[k.ease] || easingUtil.linear;
                
                for(var nm in k){
                        if(nm == "step" || nm == "ease" || nm == "from" || nm == "to"){ continue; }
                        if(!o[nm]){
                                o[nm] = {
                                        steps:[],
                                        values:[],
                                        eases:[],
                                        ease:ease
                                };
                                p[nm] = {};
                                if(!/#/.test(k[nm])){
                                        p[nm].units = o[nm].units = /\D{1,}/.exec(k[nm]).join("");
                                }else{
                                        p[nm].units = o[nm].units = "isColor";
                                }
                        }
                        
                        o[nm].eases.push(easingUtil[k.ease || "linear"]);
                        
                        o[nm].steps.push(step);
                        if(p[nm].units == "isColor"){
                                o[nm].values.push(new Color(k[nm]));
                        }else{
                                o[nm].values.push(parseInt(/\d{1,}/.exec(k[nm]).join("")));
                        }
                        
                        if(p[nm].start === undefined){
                                p[nm].start = o[nm].values[o[nm].values.length-1];
                        }else{
                                p[nm].end = o[nm].values[o[nm].values.length-1]
                        }
                }
        });
        
        
        this._properties = p;
        return o; // Object
        
};

Timeline.prototype.getValue = function(/*float*/ p){
        // summary:
        //              Replaces the native getValue in dojo.fx.Animation.
        //              Returns an object with all propeties used in the animation
        //              and the property's current value
        p = this.ani._reversed ? 1-p : p;
        var o = {}, self = this;
        
        var getProp = function(nm, i){
                return self._properties[nm].units!="isColor" ?
                        self.keys[nm].values[i] + self._properties[nm].units :
                        self.keys[nm].values[i].toCss();
        };
        
        for(var nm in this.keys){
                var k = this.keys[nm];
                for(var i=0; i<k.steps.length; i++){
                        
                        var step = k.steps[i];
                        var ns = k.steps[i+1];
                        var next = i < k.steps.length ? true : false;
                        var ease = k.eases[i] || function(n){return n;};
                        
                        if(p == step){
                                // first or last
                                o[nm] = getProp(nm, i);
                                if(!next || (next &&  this.ani._reversed)) break;
                        
                        }else if(p > step){
                                
                                if(next && p < k.steps[i+1]){
                                        // inbetween steps
                                        var end = k.values[i+1];
                                        var beg = k.values[i];
                                        
                                        var seg = (1 / (ns - step)) * (p - step);
                                        seg = ease(seg);
                                        
                                        if(beg instanceof Color){
                                                o[nm] = Color.blendColors(beg, end, seg).toCss(false);
                                        }else{
                                                var df = end - beg;
                                                o[nm] = beg + seg * df + this._properties[nm].units;
                                        }
                                        break;
                                
                                }else{
                                        // completed keys before 100%
                                        o[nm] = getProp(nm, i);
                                }
                                
                        }else if((next && !this.ani._reversed) || (!next && this.ani._reversed)){
                                o[nm] = getProp(nm, i);
                        }
                }
        }
        return o; // Object
};
dojoxFx._Timeline = Timeline;
return dojoxFx;
});