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/*
Copyright (c) 2003-2012, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/
/**
* @fileOverview Defines the {@link CKEDITOR.event} class, which serves as the
* base for classes and objects that require event handling features.
*/
if ( !CKEDITOR.event )
{
/**
* Creates an event class instance. This constructor is rearely used, being
* the {@link #.implementOn} function used in class prototypes directly
* instead.
* @class This is a base class for classes and objects that require event
* handling features.<br />
* <br />
* Do not confuse this class with {@link CKEDITOR.dom.event} which is
* instead used for DOM events. The CKEDITOR.event class implements the
* internal event system used by the CKEditor to fire API related events.
* @example
*/
CKEDITOR.event = function()
{};
/**
* Implements the {@link CKEDITOR.event} features in an object.
* @param {Object} targetObject The object into which implement the features.
* @example
* var myObject = { message : 'Example' };
* <b>CKEDITOR.event.implementOn( myObject }</b>;
* myObject.on( 'testEvent', function()
* {
* alert( this.message ); // "Example"
* });
* myObject.fire( 'testEvent' );
*/
CKEDITOR.event.implementOn = function( targetObject )
{
var eventProto = CKEDITOR.event.prototype;
for ( var prop in eventProto )
{
if ( targetObject[ prop ] == undefined )
targetObject[ prop ] = eventProto[ prop ];
}
};
CKEDITOR.event.prototype = (function()
{
// Returns the private events object for a given object.
var getPrivate = function( obj )
{
var _ = ( obj.getPrivate && obj.getPrivate() ) || obj._ || ( obj._ = {} );
return _.events || ( _.events = {} );
};
var eventEntry = function( eventName )
{
this.name = eventName;
this.listeners = [];
};
eventEntry.prototype =
{
// Get the listener index for a specified function.
// Returns -1 if not found.
getListenerIndex : function( listenerFunction )
{
for ( var i = 0, listeners = this.listeners ; i < listeners.length ; i++ )
{
if ( listeners[i].fn == listenerFunction )
return i;
}
return -1;
}
};
return /** @lends CKEDITOR.event.prototype */ {
/**
* Registers a listener to a specific event in the current object.
* @param {String} eventName The event name to which listen.
* @param {Function} listenerFunction The function listening to the
* event. A single {@link CKEDITOR.eventInfo} object instanced
* is passed to this function containing all the event data.
* @param {Object} [scopeObj] The object used to scope the listener
* call (the this object. If omitted, the current object is used.
* @param {Object} [listenerData] Data to be sent as the
* {@link CKEDITOR.eventInfo#listenerData} when calling the
* listener.
* @param {Number} [priority] The listener priority. Lower priority
* listeners are called first. Listeners with the same priority
* value are called in registration order. Defaults to 10.
* @example
* someObject.on( 'someEvent', function()
* {
* alert( this == someObject ); // "true"
* });
* @example
* someObject.on( 'someEvent', function()
* {
* alert( this == anotherObject ); // "true"
* }
* , anotherObject );
* @example
* someObject.on( 'someEvent', function( event )
* {
* alert( event.listenerData ); // "Example"
* }
* , null, 'Example' );
* @example
* someObject.on( 'someEvent', function() { ... } ); // 2nd called
* someObject.on( 'someEvent', function() { ... }, null, null, 100 ); // 3rd called
* someObject.on( 'someEvent', function() { ... }, null, null, 1 ); // 1st called
*/
on : function( eventName, listenerFunction, scopeObj, listenerData, priority )
{
// Get the event entry (create it if needed).
var events = getPrivate( this ),
event = events[ eventName ] || ( events[ eventName ] = new eventEntry( eventName ) );
if ( event.getListenerIndex( listenerFunction ) < 0 )
{
// Get the listeners.
var listeners = event.listeners;
// Fill the scope.
if ( !scopeObj )
scopeObj = this;
// Default the priority, if needed.
if ( isNaN( priority ) )
priority = 10;
var me = this;
// Create the function to be fired for this listener.
var listenerFirer = function( editor, publisherData, stopFn, cancelFn )
{
var ev =
{
name : eventName,
sender : this,
editor : editor,
data : publisherData,
listenerData : listenerData,
stop : stopFn,
cancel : cancelFn,
removeListener : function()
{
me.removeListener( eventName, listenerFunction );
}
};
listenerFunction.call( scopeObj, ev );
return ev.data;
};
listenerFirer.fn = listenerFunction;
listenerFirer.priority = priority;
// Search for the right position for this new listener, based on its
// priority.
for ( var i = listeners.length - 1 ; i >= 0 ; i-- )
{
// Find the item which should be before the new one.
if ( listeners[ i ].priority <= priority )
{
// Insert the listener in the array.
listeners.splice( i + 1, 0, listenerFirer );
return;
}
}
// If no position has been found (or zero length), put it in
// the front of list.
listeners.unshift( listenerFirer );
}
},
/**
* Fires an specific event in the object. All registered listeners are
* called at this point.
* @function
* @param {String} eventName The event name to fire.
* @param {Object} [data] Data to be sent as the
* {@link CKEDITOR.eventInfo#data} when calling the
* listeners.
* @param {CKEDITOR.editor} [editor] The editor instance to send as the
* {@link CKEDITOR.eventInfo#editor} when calling the
* listener.
* @returns {Boolean|Object} A booloan indicating that the event is to be
* canceled, or data returned by one of the listeners.
* @example
* someObject.on( 'someEvent', function() { ... } );
* someObject.on( 'someEvent', function() { ... } );
* <b>someObject.fire( 'someEvent' )</b>; // both listeners are called
* @example
* someObject.on( 'someEvent', function( event )
* {
* alert( event.data ); // "Example"
* });
* <b>someObject.fire( 'someEvent', 'Example' )</b>;
*/
fire : (function()
{
// Create the function that marks the event as stopped.
var stopped = false;
var stopEvent = function()
{
stopped = true;
};
// Create the function that marks the event as canceled.
var canceled = false;
var cancelEvent = function()
{
canceled = true;
};
return function( eventName, data, editor )
{
// Get the event entry.
var event = getPrivate( this )[ eventName ];
// Save the previous stopped and cancelled states. We may
// be nesting fire() calls.
var previousStopped = stopped,
previousCancelled = canceled;
// Reset the stopped and canceled flags.
stopped = canceled = false;
if ( event )
{
var listeners = event.listeners;
if ( listeners.length )
{
// As some listeners may remove themselves from the
// event, the original array length is dinamic. So,
// let's make a copy of all listeners, so we are
// sure we'll call all of them.
listeners = listeners.slice( 0 );
// Loop through all listeners.
for ( var i = 0 ; i < listeners.length ; i++ )
{
// Call the listener, passing the event data.
var retData = listeners[i].call( this, editor, data, stopEvent, cancelEvent );
if ( typeof retData != 'undefined' )
data = retData;
// No further calls is stopped or canceled.
if ( stopped || canceled )
break;
}
}
}
var ret = canceled || ( typeof data == 'undefined' ? false : data );
// Restore the previous stopped and canceled states.
stopped = previousStopped;
canceled = previousCancelled;
return ret;
};
})(),
/**
* Fires an specific event in the object, releasing all listeners
* registered to that event. The same listeners are not called again on
* successive calls of it or of {@link #fire}.
* @param {String} eventName The event name to fire.
* @param {Object} [data] Data to be sent as the
* {@link CKEDITOR.eventInfo#data} when calling the
* listeners.
* @param {CKEDITOR.editor} [editor] The editor instance to send as the
* {@link CKEDITOR.eventInfo#editor} when calling the
* listener.
* @returns {Boolean|Object} A booloan indicating that the event is to be
* canceled, or data returned by one of the listeners.
* @example
* someObject.on( 'someEvent', function() { ... } );
* someObject.fire( 'someEvent' ); // above listener called
* <b>someObject.fireOnce( 'someEvent' )</b>; // above listener called
* someObject.fire( 'someEvent' ); // no listeners called
*/
fireOnce : function( eventName, data, editor )
{
var ret = this.fire( eventName, data, editor );
delete getPrivate( this )[ eventName ];
return ret;
},
/**
* Unregisters a listener function from being called at the specified
* event. No errors are thrown if the listener has not been
* registered previously.
* @param {String} eventName The event name.
* @param {Function} listenerFunction The listener function to unregister.
* @example
* var myListener = function() { ... };
* someObject.on( 'someEvent', myListener );
* someObject.fire( 'someEvent' ); // myListener called
* <b>someObject.removeListener( 'someEvent', myListener )</b>;
* someObject.fire( 'someEvent' ); // myListener not called
*/
removeListener : function( eventName, listenerFunction )
{
// Get the event entry.
var event = getPrivate( this )[ eventName ];
if ( event )
{
var index = event.getListenerIndex( listenerFunction );
if ( index >= 0 )
event.listeners.splice( index, 1 );
}
},
/**
* Checks if there is any listener registered to a given event.
* @param {String} eventName The event name.
* @example
* var myListener = function() { ... };
* someObject.on( 'someEvent', myListener );
* alert( someObject.<b>hasListeners( 'someEvent' )</b> ); // "true"
* alert( someObject.<b>hasListeners( 'noEvent' )</b> ); // "false"
*/
hasListeners : function( eventName )
{
var event = getPrivate( this )[ eventName ];
return ( event && event.listeners.length > 0 ) ;
}
};
})();
}
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