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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 WebInspector.Object = function() {
     27 }
     28 
     29 WebInspector.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