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/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2004-2007 1&1 Internet AG, Germany, http://www.1and1.org
License:
LGPL: http://www.gnu.org/licenses/lgpl.html
EPL: http://www.eclipse.org/org/documents/epl-v10.php
See the LICENSE file in the project's top-level directory for details.
Authors:
* Sebastian Werner (wpbasti)
* Andreas Ecker (ecker)
************************************************************************ */
/* ************************************************************************
#module(core)
************************************************************************ */
/**
* This is the main constructor for all objects that need to be connected to qx.event.type.Event objects.
*
* In objects created with this constructor, you find functions to addEventListener or
* removeEventListener to or from the created object. Each event to connect to has a type in
* form of an identification string. This type could be the name of a regular dom event like "click" or
* something self-defined like "ready".
*
* @param vAutoDispose {Boolean ? true} wether the object should be disposed automatically by qooxdoo
*/
qx.OO.defineClass("qx.core.Target", qx.core.Object,
function(vAutoDispose) {
qx.core.Object.call(this, vAutoDispose);
});
/**
* @private
*/
qx.Class.EVENTPREFIX = "evt";
/*
---------------------------------------------------------------------------
EVENT CONNECTION
---------------------------------------------------------------------------
*/
/**
* Add event listener to an object.
*
* @param vType {String} name of the event type
* @param vFunction {Function} event callback function
* @param vObject {Object ? window} reference to the 'this' variable inside the callback
*/
qx.Proto.addEventListener = function(vType, vFunction, vObject)
{
if(this._disposed) {
return;
}
if(typeof vFunction !== "function") {
throw new Error("qx.core.Target: addEventListener(" + vType + "): '" + vFunction + "' is not a function!");
}
// If this is the first event of given type, we need to create a subobject
// that contains all the actions that will be assigned to this type
if (this._listeners === undefined) {
this._listeners = {};
}
if(this._listeners[vType] === undefined) {
this._listeners[vType] = {};
}
// Create a special vKey string to allow identification of each bound action
var vKey = qx.core.Target.EVENTPREFIX + qx.core.Object.toHashCode(vFunction) + (vObject ? "_" + qx.core.Object.toHashCode(vObject) : "");
// Finally set up the listeners object
this._listeners[vType][vKey] =
{
handler : vFunction,
object : vObject
}
}
/**
* Remove event listener from object
*
* @param vType {String} name of the event type
* @param vFunction {Function} event callback function
* @param vObject {Object ? window} reference to the 'this' variable inside the callback
*/
qx.Proto.removeEventListener = function(vType, vFunction, vObject)
{
if(this._disposed) {
return;
}
var vListeners = this._listeners;
if (!vListeners || vListeners[vType] === undefined) {
return;
}
if(typeof vFunction !== "function") {
throw new Error("qx.core.Target: removeEventListener(" + vType + "): '" + vFunction + "' is not a function!");
}
// Create a special vKey string to allow identification of each bound action
var vKey = qx.core.Target.EVENTPREFIX + qx.core.Object.toHashCode(vFunction) + (vObject ? "_" + qx.core.Object.toHashCode(vObject) : "");
// Delete object entry for this action
delete this._listeners[vType][vKey];
}
/*
---------------------------------------------------------------------------
EVENT CONNECTION UTILITIES
---------------------------------------------------------------------------
*/
/**
* Check if there are one or more listeners for an event type.
*
* @param vType {String} name of the event type
*/
qx.Proto.hasEventListeners = function(vType) {
return this._listeners && typeof this._listeners[vType] !== "undefined" && !qx.lang.Object.isEmpty(this._listeners[vType]);
}
/**
* Checks if the event is registered. If so it creates an event object and dispatches it.
*
* @param vType {String} name of the event type
*/
qx.Proto.createDispatchEvent = function(vType)
{
if (this.hasEventListeners(vType)) {
this.dispatchEvent(new qx.event.type.Event(vType), true);
}
}
/**
* Checks if the event is registered. If so it creates an event object and dispatches it.
*
* @param vType {String} name of the event type
* @param vData {Object} user defined data attached to the event object
*/
qx.Proto.createDispatchDataEvent = function(vType, vData)
{
if (this.hasEventListeners(vType)) {
this.dispatchEvent(new qx.event.type.DataEvent(vType, vData), true);
}
}
/*
---------------------------------------------------------------------------
EVENT DISPATCH
---------------------------------------------------------------------------
*/
/**
* Dispatch an event
*
* @param vEvent {qx.event.type.Event} event to dispatch
* @param vEnableDispose {Boolean} wether the event object should be disposed after all event handlers run.
* @return {Boolean} wether the event default was prevented or not. Returns true, when the event was NOT prevented.
*/
qx.Proto.dispatchEvent = function(vEvent, vEnableDispose)
{
// Ignore event if eventTarget is disposed
if(this.getDisposed() && this.getEnabled()) {
return;
}
if (vEvent.getTarget() == null) {
vEvent.setTarget(this);
}
if (vEvent.getCurrentTarget() == null) {
vEvent.setCurrentTarget(this);
}
// Dispatch Event
this._dispatchEvent(vEvent, vEnableDispose);
// Read default prevented
var defaultPrevented = vEvent._defaultPrevented;
// enable dispose for event?
vEnableDispose && vEvent.dispose();
return !defaultPrevented;
}
/**
* Internal event dispatch method
*
* @param vEvent {qx.event.type.Event} event to dispatch
*/
qx.Proto._dispatchEvent = function(vEvent)
{
var vListeners = this._listeners;
if (vListeners)
{
// Setup current target
vEvent.setCurrentTarget(this);
// Shortcut for listener data
var vTypeListeners = vListeners[vEvent.getType()];
if(vTypeListeners)
{
var vFunction, vObject;
// Handle all events for the specified type
for (var vHashCode in vTypeListeners)
{
// Shortcuts for handler and object
vFunction = vTypeListeners[vHashCode].handler;
vObject = vTypeListeners[vHashCode].object || this;
// Call object function
try
{
vFunction.call(vObject, vEvent);
}
catch(ex)
{
this.error("Could not dispatch event of type \"" + vEvent.getType() + "\"", ex);
}
}
}
}
// Bubble event to parents
// TODO: Move this to Parent or Widget?
if(vEvent.getBubbles() && !vEvent.getPropagationStopped() && this.getParent)
{
var vParent = this.getParent();
if (vParent && !vParent.getDisposed() && vParent.getEnabled()) {
vParent._dispatchEvent(vEvent);
}
}
}
/*
---------------------------------------------------------------------------
DISPOSER
---------------------------------------------------------------------------
*/
/**
* Destructor.
*/
qx.Proto.dispose = function()
{
if(this.getDisposed()) {
return;
}
if (typeof this._listeners === "object")
{
for (var vType in this._listeners)
{
var listener = this._listeners[vType];
for (var vKey in listener)
{
listener[vKey] = null;
}
this._listeners[vType] = null;
}
}
this._listeners = null;
return qx.core.Object.prototype.dispose.call(this);
}
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