1/**
2 * Manage delayed and timed actions
3 *
4 * @license GPL2 (http://www.gnu.org/licenses/gpl.html)
5 * @author  Adrian Lang <lang@cosmocode.de>
6 */
7
8/**
9 * Provide a global callback for window.setTimeout
10 *
11 * To get a timeout for non-global functions, just call
12 * delay.add(func, timeout).
13 */
14var timer = {
15    _cur_id: 0,
16    _handlers: {},
17
18    execDispatch: function (id) {
19        timer._handlers[id]();
20    },
21
22    add: function (func, timeout) {
23        var id = ++timer._cur_id;
24        timer._handlers[id] = func;
25        return window.setTimeout('timer.execDispatch(' + id + ')', timeout);
26    }
27};
28
29/**
30 * Provide a delayed start
31 *
32 * To call a function with a delay, just create a new Delay(func, timeout) and
33 * call that object’s method “start”.
34 */
35function Delay (func, timeout) {
36    this.func = func;
37    if (timeout) {
38        this.timeout = timeout;
39    }
40}
41
42Delay.prototype = {
43    func: null,
44    timeout: 500,
45
46    delTimer: function () {
47        if (this.timer !== null) {
48            window.clearTimeout(this.timer);
49            this.timer = null;
50        }
51    },
52
53    start: function () {
54        DEPRECATED('don\'t use the Delay object, use window.timeout with a callback instead');
55        this.delTimer();
56        var _this = this;
57        this.timer = timer.add(function () { _this.exec.call(_this); },
58                               this.timeout);
59
60        this._data = {
61            _this: arguments[0],
62            _params: Array.prototype.slice.call(arguments, 2)
63        };
64    },
65
66    exec: function () {
67        this.delTimer();
68        this.func.call(this._data._this, this._data._params);
69    }
70};
71