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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 
     26 /**
     27  * @constructor
     28  * @implements {WebInspector.EventTarget}
     29  */
     30 WebInspector.Object = function() {
     31 }
     32 
     33 WebInspector.Object.prototype = {
     34     /**
     35      * @param {string} eventType
     36      * @param {function(WebInspector.Event)} listener
     37      * @param {Object=} thisObject
     38      */
     39     addEventListener: function(eventType, listener, thisObject)
     40     {
     41         if (!listener)
     42             console.assert(false);
     43 
     44         if (!this._listeners)
     45             this._listeners = {};
     46         if (!this._listeners[eventType])
     47             this._listeners[eventType] = [];
     48         this._listeners[eventType].push({ thisObject: thisObject, listener: listener });
     49     },
     50 
     51     /**
     52      * @param {string} eventType
     53      * @param {function(WebInspector.Event)} listener
     54      * @param {Object=} thisObject
     55      */
     56     removeEventListener: function(eventType, listener, thisObject)
     57     {
     58         console.assert(listener);
     59 
     60         if (!this._listeners || !this._listeners[eventType])
     61             return;
     62         var listeners = this._listeners[eventType];
     63         for (var i = 0; i < listeners.length; ++i) {
     64             if (listener && listeners[i].listener === listener && listeners[i].thisObject === thisObject)
     65                 listeners.splice(i, 1);
     66             else if (!listener && thisObject && listeners[i].thisObject === thisObject)
     67                 listeners.splice(i, 1);
     68         }
     69 
     70         if (!listeners.length)
     71             delete this._listeners[eventType];
     72     },
     73 
     74     removeAllListeners: function()
     75     {
     76         delete this._listeners;
     77     },
     78 
     79     /**
     80      * @param {string} eventType
     81      * @return {boolean}
     82      */
     83     hasEventListeners: function(eventType)
     84     {
     85         if (!this._listeners || !this._listeners[eventType])
     86             return false;
     87         return true;
     88     },
     89 
     90     /**
     91      * @param {string} eventType
     92      * @param {*=} eventData
     93      * @return {boolean}
     94      */
     95     dispatchEventToListeners: function(eventType, eventData)
     96     {
     97         if (!this._listeners || !this._listeners[eventType])
     98             return false;
     99 
    100         var event = new WebInspector.Event(this, eventType, eventData);
    101         var listeners = this._listeners[eventType].slice(0);
    102         for (var i = 0; i < listeners.length; ++i) {
    103             listeners[i].listener.call(listeners[i].thisObject, event);
    104             if (event._stoppedPropagation)
    105                 break;
    106         }
    107 
    108         return event.defaultPrevented;
    109     }
    110 }
    111 
    112 /**
    113  * @constructor
    114  * @param {WebInspector.EventTarget} target
    115  * @param {string} type
    116  * @param {*=} data
    117  */
    118 WebInspector.Event = function(target, type, data)
    119 {
    120     this.target = target;
    121     this.type = type;
    122     this.data = data;
    123     this.defaultPrevented = false;
    124     this._stoppedPropagation = false;
    125 }
    126 
    127 WebInspector.Event.prototype = {
    128     stopPropagation: function()
    129     {
    130         this._stoppedPropagation = true;
    131     },
    132 
    133     preventDefault: function()
    134     {
    135         this.defaultPrevented = true;
    136     },
    137 
    138     /**
    139      * @param {boolean=} preventDefault
    140      */
    141     consume: function(preventDefault)
    142     {
    143         this.stopPropagation();
    144         if (preventDefault)
    145             this.preventDefault();
    146     }
    147 }
    148 
    149 /**
    150  * @interface
    151  */
    152 WebInspector.EventTarget = function()
    153 {
    154 }
    155 
    156 WebInspector.EventTarget.prototype = {
    157     /**
    158      * @param {string} eventType
    159      * @param {function(WebInspector.Event)} listener
    160      * @param {Object=} thisObject
    161      */
    162     addEventListener: function(eventType, listener, thisObject) { },
    163 
    164     /**
    165      * @param {string} eventType
    166      * @param {function(WebInspector.Event)} listener
    167      * @param {Object=} thisObject
    168      */
    169     removeEventListener: function(eventType, listener, thisObject) { },
    170 
    171     removeAllListeners: function() { },
    172 
    173     /**
    174      * @param {string} eventType
    175      * @return {boolean}
    176      */
    177     hasEventListeners: function(eventType) { },
    178 
    179     /**
    180      * @param {string} eventType
    181      * @param {*=} eventData
    182      * @return {boolean}
    183      */
    184     dispatchEventToListeners: function(eventType, eventData) { },
    185 }
    186 
    187 WebInspector.notifications = new WebInspector.Object();
    188