@qooxdoo/framework
Version:
The JS Framework for Coders
206 lines (145 loc) • 4.85 kB
JavaScript
/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2007-2011 1&1 Internet AG, Germany, http://www.1und1.de
License:
MIT: https://opensource.org/licenses/MIT
See the LICENSE file in the project's top-level directory for details.
Authors:
* Martin Wittemann (martinwittemann)
************************************************************************ */
/**
* This class provides a handler for the online event.
*
* NOTE: Instances of this class must be disposed of after use
*
*/
qx.Class.define("qx.event.handler.Offline",
{
extend : qx.core.Object,
implement : [ qx.event.IEventHandler, qx.core.IDisposable ],
/*
*****************************************************************************
CONSTRUCTOR
*****************************************************************************
*/
/**
* Create a new instance
*
* @param manager {qx.event.Manager} Event manager for the window to use
*/
construct : function(manager)
{
this.base(arguments);
this.__manager = manager;
this.__window = manager.getWindow();
this._initObserver();
},
/*
*****************************************************************************
STATICS
*****************************************************************************
*/
statics :
{
/** @type {Integer} Priority of this handler */
PRIORITY : qx.event.Registration.PRIORITY_NORMAL,
/** @type {Map} Supported event types */
SUPPORTED_TYPES :
{
online : true,
offline : true
},
/** @type {Integer} Which target check to use */
TARGET_CHECK : qx.event.IEventHandler.TARGET_WINDOW,
/** @type {Integer} Whether the method "canHandleEvent" must be called */
IGNORE_CAN_HANDLE : true
},
/*
*****************************************************************************
MEMBERS
*****************************************************************************
*/
members :
{
__manager : null,
__window : null,
__onNativeWrapper : null,
/*
---------------------------------------------------------------------------
EVENT HANDLER INTERFACE
---------------------------------------------------------------------------
*/
// interface implementation
canHandleEvent : function(target, type) {},
// interface implementation
registerEvent : function(target, type, capture) {
// Nothing needs to be done here
},
// interface implementation
unregisterEvent : function(target, type, capture) {
// Nothing needs to be done here
},
/**
* Connects the native online and offline event listeners.
*/
_initObserver : function() {
this.__onNativeWrapper = qx.lang.Function.listener(this._onNative, this);
qx.bom.Event.addNativeListener(this.__window, "offline", this.__onNativeWrapper);
qx.bom.Event.addNativeListener(this.__window, "online", this.__onNativeWrapper);
},
/**
* Disconnects the native online and offline event listeners.
*/
_stopObserver : function() {
qx.bom.Event.removeNativeListener(this.__window, "offline", this.__onNativeWrapper);
qx.bom.Event.removeNativeListener(this.__window, "online", this.__onNativeWrapper);
},
/**
* Native handler function which fires a qooxdoo event.
* @signature function(domEvent)
* @param domEvent {Event} Native DOM event
*/
_onNative : qx.event.GlobalError.observeMethod(function(domEvent) {
qx.event.Registration.fireEvent(
this.__window,
domEvent.type,
qx.event.type.Event,
[]
);
}),
/*
---------------------------------------------------------------------------
USER ACCESS
---------------------------------------------------------------------------
*/
/**
* Returns whether the current window thinks its online or not.
* @return {Boolean} <code>true</code> if its online
*/
isOnline : function() {
return !!this.__window.navigator.onLine;
}
},
/*
*****************************************************************************
DESTRUCTOR
*****************************************************************************
*/
destruct : function()
{
this.__manager = null;
this._stopObserver();
// Deregister
delete qx.event.handler.Appear.__instances[this.$$hash];
},
/*
*****************************************************************************
DEFER
*****************************************************************************
*/
defer : function(statics) {
qx.event.Registration.addHandler(statics);
}
});