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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    {
32        if (!("_listeners" in this))
33            this._listeners = {};
34        if (!(eventType in this._listeners))
35            this._listeners[eventType] = [];
36        this._listeners[eventType].push({ thisObject: thisObject, listener: listener });
37    },
38
39    removeEventListener: function(eventType, listener, thisObject)
40    {
41        if (!("_listeners" in this) || !(eventType in this._listeners))
42            return;
43        var listeners = this._listeners[eventType];
44        for (var i = 0; i < listeners.length; ++i) {
45            if (listener && listeners[i].listener === listener && listeners[i].thisObject === thisObject)
46                listeners.splice(i, 1);
47            else if (!listener && thisObject && listeners[i].thisObject === thisObject)
48                listeners.splice(i, 1);
49        }
50
51        if (!listeners.length)
52            delete this._listeners[eventType];
53    },
54
55    removeAllListeners: function()
56    {
57        delete this._listeners;
58    },
59
60    hasEventListeners: function(eventType)
61    {
62        if (!("_listeners" in this) || !(eventType in this._listeners))
63            return false;
64        return true;
65    },
66
67    dispatchEventToListeners: function(eventType, eventData)
68    {
69        if (!("_listeners" in this) || !(eventType in this._listeners))
70            return;
71
72        var stoppedPropagation = false;
73
74        function stopPropagation()
75        {
76            stoppedPropagation = true;
77        }
78
79        function preventDefault()
80        {
81            this.defaultPrevented = true;
82        }
83
84        var event = {target: this, type: eventType, data: eventData, defaultPrevented: false};
85        event.stopPropagation = stopPropagation;
86        event.preventDefault = preventDefault;
87
88        var listeners = this._listeners[eventType].slice(0);
89        for (var i = 0; i < listeners.length; ++i) {
90            listeners[i].listener.call(listeners[i].thisObject, event);
91            if (stoppedPropagation)
92                break;
93        }
94
95        return event.defaultPrevented;
96    }
97}
98