Roo/lib/AnimMgr.js


/*
 * Portions of this file are based on pieces of Yahoo User Interface Library
 * Copyright (c) 2007, Yahoo! Inc. All rights reserved.
 * YUI licensed under the BSD License:
 * http://developer.yahoo.net/yui/license.txt
 * <script type="text/javascript">
 *
 */

Roo.lib.AnimMgr = new function() {

    var thread = null;


    var queue = [];


    var tweenCount = 0;


    this.fps = 1000;


    this.delay = 1;


    this.registerElement = function(tween) {
        queue[queue.length] = tween;
        tweenCount += 1;
        tween._onStart.fire();
        this.start();
    };


    this.unRegister = function(tween, index) {
        tween._onComplete.fire();
        index = index || getIndex(tween);
        if (index != -1) {
            queue.splice(index, 1);
        }

        tweenCount -= 1;
        if (tweenCount <= 0) {
            this.stop();
        }
    };


    this.start = function() {
        if (thread === null) {
            thread = setInterval(this.run, this.delay);
        }
    };


    this.stop = function(tween) {
        if (!tween) {
            clearInterval(thread);

            for (var i = 0, len = queue.length; i < len; ++i) {
                if (queue[0].isAnimated()) {
                    this.unRegister(queue[0], 0);
                }
            }

            queue = [];
            thread = null;
            tweenCount = 0;
        }
        else {
            this.unRegister(tween);
        }
    };


    this.run = function() {
        for (var i = 0, len = queue.length; i < len; ++i) {
            var tween = queue[i];
            if (!tween || !tween.isAnimated()) {
                continue;
            }

            if (tween.currentFrame < tween.totalFrames || tween.totalFrames === null)
            {
                tween.currentFrame += 1;

                if (tween.useSeconds) {
                    correctFrame(tween);
                }
                tween._onTween.fire();
            }
            else {
                Roo.lib.AnimMgr.stop(tween, i);
            }
        }
    };

    var getIndex = function(anim) {
        for (var i = 0, len = queue.length; i < len; ++i) {
            if (queue[i] == anim) {
                return i;
            }
        }
        return -1;
    };


    var correctFrame = function(tween) {
        var frames = tween.totalFrames;
        var frame = tween.currentFrame;
        var expected = (tween.currentFrame * tween.duration * 1000 / tween.totalFrames);
        var elapsed = (new Date() - tween.getStartTime());
        var tweak = 0;

        if (elapsed < tween.duration * 1000) {
            tweak = Math.round((elapsed / expected - 1) * tween.currentFrame);
        } else {
            tweak = frames - (frame + 1);
        }
        if (tweak > 0 && isFinite(tweak)) {
            if (tween.currentFrame + tweak >= frames) {
                tweak = frames - (frame + 1);
            }

            tween.currentFrame += tweak;
        }
    };
};