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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 (listeners[i].listener === listener && listeners[i].thisObject === thisObject)
     65                 listeners.splice(i--, 1);
     66         }
     67 
     68         if (!listeners.length)
     69             delete this._listeners[eventType];
     70     },
     71 
     72     removeAllListeners: function()
     73     {
     74         delete this._listeners;
     75     },
     76 
     77     /**
     78      * @param {string} eventType
     79      * @return {boolean}
     80      */
     81     hasEventListeners: function(eventType)
     82     {
     83         if (!this._listeners || !this._listeners[eventType])
     84             return false;
     85         return true;
     86     },
     87 
     88     /**
     89      * @param {string} eventType
     90      * @param {*=} eventData
     91      * @return {boolean}
     92      */
     93     dispatchEventToListeners: function(eventType, eventData)
     94     {
     95         if (!this._listeners || !this._listeners[eventType])
     96             return false;
     97 
     98         var event = new WebInspector.Event(this, eventType, eventData);
     99         var listeners = this._listeners[eventType].slice(0);
    100         for (var i = 0; i < listeners.length; ++i) {
    101             listeners[i].listener.call(listeners[i].thisObject, event);
    102             if (event._stoppedPropagation)
    103                 break;
    104         }
    105 
    106         return event.defaultPrevented;
    107     }
    108 }
    109 
    110 /**
    111  * @constructor
    112  * @param {!WebInspector.EventTarget} target
    113  * @param {string} type
    114  * @param {*=} data
    115  */
    116 WebInspector.Event = function(target, type, data)
    117 {
    118     this.target = target;
    119     this.type = type;
    120     this.data = data;
    121     this.defaultPrevented = false;
    122     this._stoppedPropagation = false;
    123 }
    124 
    125 WebInspector.Event.prototype = {
    126     stopPropagation: function()
    127     {
    128         this._stoppedPropagation = true;
    129     },
    130 
    131     preventDefault: function()
    132     {
    133         this.defaultPrevented = true;
    134     },
    135 
    136     /**
    137      * @param {boolean=} preventDefault
    138      */
    139     consume: function(preventDefault)
    140     {
    141         this.stopPropagation();
    142         if (preventDefault)
    143             this.preventDefault();
    144     }
    145 }
    146 
    147 /**
    148  * @interface
    149  */
    150 WebInspector.EventTarget = function()
    151 {
    152 }
    153 
    154 WebInspector.EventTarget.prototype = {
    155     /**
    156      * @param {string} eventType
    157      * @param {function(!WebInspector.Event)} listener
    158      * @param {!Object=} thisObject
    159      */
    160     addEventListener: function(eventType, listener, thisObject) { },
    161 
    162     /**
    163      * @param {string} eventType
    164      * @param {function(!WebInspector.Event)} listener
    165      * @param {!Object=} thisObject
    166      */
    167     removeEventListener: function(eventType, listener, thisObject) { },
    168 
    169     removeAllListeners: function() { },
    170 
    171     /**
    172      * @param {string} eventType
    173      * @return {boolean}
    174      */
    175     hasEventListeners: function(eventType) { },
    176 
    177     /**
    178      * @param {string} eventType
    179      * @param {*=} eventData
    180      * @return {boolean}
    181      */
    182     dispatchEventToListeners: function(eventType, eventData) { },
    183 }
    184