Continue animation while tab hidden (switched to other tab)

[sendel]

May be need setup config with this function, some modes:

1. normal (as now, freeze animation while tab hidden)
2. always (as this patch, continue animation when tab hidden by timer)
3. fast (as idea, for transitions set it in last position and end, as normally ended)

/*******/

Kinetic.Animation.requestAnimFrame = function(callback) {
    var raf = Kinetic.DD && Kinetic.DD.isDragging ? this.fixedRequestAnimFrame : RAF;
    function getHidden(){
        var hidden, visibilityChange; 
        if (typeof document.hidden !== "undefined") { // Opera 12.10 and Firefox 18 and later support 
            hidden = "hidden";
            visibilityChange = "visibilitychange";
        } else if (typeof document.mozHidden !== "undefined") {
            hidden = "mozHidden";
            visibilityChange = "mozvisibilitychange";
        } else if (typeof document.msHidden !== "undefined") {
            hidden = "msHidden";
            visibilityChange = "msvisibilitychange";
        } else if (typeof document.webkitHidden !== "undefined") {
            hidden = "webkitHidden";
            visibilityChange = "webkitvisibilitychange";
        }
        else
            {
                return true;
            }
        return document[hidden];

    }

    var hidden = getHidden();

    raf = hidden ? this.fixedRequestAnimFrame: raf;
    raf(callback);
};

[sendel]

new implementation (fast set to end of tween) for Sprite need also

/***/

    onEnterFrame: function() {
        var t = this.getTimer() - this._startTime;
        if(getHidden() && t < this.duration && t>=0)
        {
            t = this.duration;

        }
        if(this.state === PLAYING) {
            this.setTime(t);
        }
        else if (this.state === REVERSING) {
            this.setTime(this.duration - t);
        }
    },

[sendel]

for Sprite (not full test)

/***/

     _updateIndex: function() {
        var index = this.getIndex(),
            animation = this.getAnimation(),
            animations = this.getAnimations(),
            anim = animations[animation], 
            len = anim.length;
        if(getHidden())
        {
            index = len - 1;

        }            
        if(index < len - 1) {
            this.setIndex(index + 1);
        }
        else {
            this.setIndex(0);
        }
    }

[sendel]

full solution
sendel@a9036d1
&&
sendel@e68ba39