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/** @file
* MS COM / XPCOM Abstraction Layer - Event and EventQueue class declaration.
*/
/*
* Copyright (C) 2006-2025 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef VBOX_INCLUDED_com_NativeEventQueue_h
#define VBOX_INCLUDED_com_NativeEventQueue_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#ifndef VBOX_WITH_XPCOM
# include <iprt/win/windows.h>
#else
# include <nsEventQueueUtils.h>
#endif
#include <VBox/com/defs.h>
#include <VBox/com/assert.h>
/** @defgroup grp_com_evt Event and EventQueue Classes
* @ingroup grp_com
* @{
*/
namespace com
{
class MainEventQueue;
/**
* 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 NativeEvent
{
public:
NativeEvent() {}
virtual ~NativeEvent() {};
protected:
/**
* 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 NativeEventQueue;
};
/**
* Simple event queue.
*
* When using XPCOM, this will map onto the default XPCOM queue for the thread.
* So, if a queue is created on the main thread, it automatically processes
* XPCOM/IPC events while waiting.
*
* When using Windows, Darwin and OS/2, this will map onto the native thread
* queue/runloop. So, windows messages and what not will be processed while
* waiting for events.
*
* @note It is intentional that there is no way to retrieve arbitrary
* events and controlling their processing. There is no use case which
* warrants introducing the complexity of platform independent events.
*/
class NativeEventQueue
{
public:
NativeEventQueue();
virtual ~NativeEventQueue();
BOOL postEvent(NativeEvent *event);
int processEventQueue(RTMSINTERVAL cMsTimeout);
int interruptEventQueueProcessing();
int getSelectFD();
static int init();
static int uninit();
static NativeEventQueue *getMainEventQueue();
#ifdef VBOX_WITH_XPCOM
already_AddRefed<nsIEventQueue> getIEventQueue()
{
return mEventQ.get();
}
#else
static int dispatchMessageOnWindows(MSG const *pMsg, int vrc);
#endif
private:
static NativeEventQueue *sMainQueue;
#ifndef VBOX_WITH_XPCOM
/** The thread which the queue belongs to. */
DWORD mThreadId;
/** Duplicated thread handle for MsgWaitForMultipleObjects. */
HANDLE mhThread;
#else // VBOX_WITH_XPCOM
/** Whether it was created (and thus needs destroying) or if a queue already
* associated with the thread was used. */
bool mEQCreated;
/** Whether event processing should be interrupted. */
bool mInterrupted;
nsCOMPtr <nsIEventQueue> mEventQ;
nsCOMPtr <nsIEventQueueService> mEventQService;
static void *PR_CALLBACK plEventHandler(PLEvent *self);
static void PR_CALLBACK plEventDestructor(PLEvent *self);
#endif // VBOX_WITH_XPCOM
};
} /* namespace com */
/** @} */
#endif /* !VBOX_INCLUDED_com_NativeEventQueue_h */
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