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

define(["dojo/_base/kernel","dojo/_base/lang", "dojo/_base/fx", "dojox/fx/_base","dojox/fx/_core","dojo/dom-geometry","dojo/_base/sniff"],
        function (kernel, lang, baseFx, fxExt, Line, domGeom, has){
        kernel.experimental("dojox.fx.scroll");
        var fx = lang.getObject("dojox.fx",true);
        fxExt.smoothScroll = function(/* Object */args){
                // summary:
                //              Returns an animation that will smooth-scroll to a node
                // description:
                //              This implementation support either horizontal or vertical scroll, as well as
                //              both. In addition, element in iframe can be scrolled to correctly.
                // args:
                //              - offset: {x: int, y: int} this will be added to the target position
                //              - duration: Duration of the animation in milliseconds.
                //              - win: a node or window object to scroll
        
                if(!args.target){ args.target = domGeom.position(args.node); }
        
                var isWindow = lang[(has("ie") ? "isObject" : "isFunction")](args["win"].scrollTo),
                        delta = { x: args.target.x, y: args.target.y }
                ;
                if(!isWindow){
                        var winPos = domGeom.position(args.win);
                        delta.x -= winPos.x;
                        delta.y -= winPos.y;
                }
                var _anim = (isWindow) ?
                        (function(val){
                                args.win.scrollTo(val[0],val[1]);
                        }) :
                        (function(val){
                                args.win.scrollLeft = val[0];
                                args.win.scrollTop = val[1];
                        });
                var anim = new baseFx.Animation(lang.mixin({
                        beforeBegin: function(){
                                if(this.curve){ delete this.curve; }
                                var current = isWindow ? dojo._docScroll() : {x: args.win.scrollLeft, y: args.win.scrollTop};
                                anim.curve = new Line([current.x,current.y],[current.x + delta.x, current.y + delta.y]);
                        },
                        onAnimate: _anim
                },args));
                return anim; // dojo.Animation
        };
        fx.smoothScroll = fxExt.smoothScroll;
        return fxExt.smoothScroll;
});