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/** @file
* MS COM / XPCOM Abstraction Layer:
* Event and EventQueue class declaration
*/
/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
#ifndef ___VBox_com_EventQueue_h
#define ___VBox_com_EventQueue_h
#if !defined (VBOX_WITH_XPCOM)
#include <windows.h>
#else
#include <nsEventQueueUtils.h>
#endif
#include <VBox/com/defs.h>
#include <VBox/com/assert.h>
namespace com
{
class EventQueue;
/**
* Base class for all events. Intended to be subclassed to introduce new events
* and handlers for them.
*
* Subclasses usually reimplement virtual #handler() (that does nothing by
* default) and add new data members describing the event.
*/
class Event
{
public:
Event() {}
protected:
virtual ~Event() {};
/**
* Event handler. Called in the context of the event queue's thread.
* Always reimplemented by subclasses
*
* @return reserved, should be NULL.
*/
virtual void *handler() { return NULL; }
friend class EventQueue;
};
/**
* Simple event queue.
*
* On Linux, if this queue is created on the main thread, it automatically
* processes XPCOM/IPC events while waiting for its own (Event) events.
*/
class EventQueue
{
public:
EventQueue();
~EventQueue();
BOOL postEvent (Event *event);
BOOL waitForEvent (Event **event);
BOOL handleEvent (Event *event);
private:
#if !defined (VBOX_WITH_XPCOM)
DWORD mThreadId;
#else
BOOL mEQCreated;
nsCOMPtr <nsIEventQueue> mEventQ;
nsCOMPtr <nsIEventQueueService> mEventQService;
Event *mLastEvent;
BOOL mGotEvent;
struct MyPLEvent : public PLEvent
{
MyPLEvent (Event *e) : event (e) {}
Event *event;
};
static void * PR_CALLBACK plEventHandler (PLEvent* self)
{
// nsIEventQueue doesn't expose PL_GetEventOwner(), so use an internal
// field of PLEvent directly (hackish, but doesn' require an extra lib)
EventQueue *owner = (EventQueue *) self->owner;
Assert (owner);
owner->mLastEvent = ((MyPLEvent *) self)->event;
owner->mGotEvent = TRUE;
return 0;
}
static void PR_CALLBACK plEventDestructor (PLEvent* self) { delete self; }
#endif
};
} /* namespace com */
#endif
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