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1/*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26WebInspector.Object = function() {
27}
28
29WebInspector.Object.prototype = {
30    addEventListener: function(eventType, listener, thisObject) {
31        if (!("_listeners" in this))
32            this._listeners = {};
33        if (!(eventType in this._listeners))
34            this._listeners[eventType] = [];
35        this._listeners[eventType].push({ thisObject: thisObject, listener: listener });
36    },
37
38    removeEventListener: function(eventType, listener, thisObject) {
39        if (!("_listeners" in this) || !(eventType in this._listeners))
40            return;
41        var listeners = this._listeners[eventType];
42        for (var i = 0; i < listeners.length; ++i) {
43            if (listener && listeners[i].listener === listener && listeners[i].thisObject === thisObject)
44                listeners.splice(i, 1);
45            else if (!listener && thisObject && listeners[i].thisObject === thisObject)
46                listeners.splice(i, 1);
47        }
48
49        if (!listeners.length)
50            delete this._listeners[eventType];
51    },
52
53    dispatchEventToListeners: function(eventType) {
54        if (!("_listeners" in this) || !(eventType in this._listeners))
55            return;
56
57        var stoppedPropagation = false;
58
59        function stopPropagation()
60        {
61            stoppedPropagation = true;
62        }
63
64        function preventDefault()
65        {
66            this.defaultPrevented = true;
67        }
68
69        var event = {target: this, type: eventType, defaultPrevented: false};
70        event.stopPropagation = stopPropagation.bind(event);
71        event.preventDefault = preventDefault.bind(event);
72
73        var listeners = this._listeners[eventType];
74        for (var i = 0; i < listeners.length; ++i) {
75            listeners[i].listener.call(listeners[i].thisObject, event);
76            if (stoppedPropagation)
77                break;
78        }
79
80        return event.defaultPrevented;
81    }
82}
83