@qooxdoo/framework
Version:
The JS Framework for Coders
191 lines (155 loc) • 4.81 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(manager) {
super();
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(target, type) {},
// interface implementation
registerEvent(target, type, capture) {
// Nothing needs to be done here
},
// interface implementation
unregisterEvent(target, type, capture) {
// Nothing needs to be done here
},
/**
* Connects the native online and offline event listeners.
*/
_initObserver() {
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() {
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() {
return !!this.__window.navigator.onLine;
}
},
/*
*****************************************************************************
DESTRUCTOR
*****************************************************************************
*/
destruct() {
this.__manager = null;
this._stopObserver();
// Deregister
delete qx.event.handler.Appear.__instances[this.toHashCode()];
},
/*
*****************************************************************************
DEFER
*****************************************************************************
*/
defer(statics) {
qx.event.Registration.addHandler(statics);
}
});