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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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// -=- EventManager.h
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// Win32 event manager. Caller supplies event & handler pairs and
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// then uses getMessage() in place of ::GetMessage() in the main
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// loop. EventManager calls the event handler whenever the event
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// is set.
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// Ownership of events remains with the caller.
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// It is the responsibility of handlers to reset events.
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#ifndef __RFB_WIN32_EVENT_MGR_H__
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#define __RFB_WIN32_EVENT_MGR_H__
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#include <rfb_win32/Win32Util.h>
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namespace rfb {
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namespace win32 {
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class EventHandler {
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public:
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virtual ~EventHandler() {}
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virtual void processEvent(HANDLE event) = 0;
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};
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class EventManager {
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public:
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EventManager();
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virtual ~EventManager();
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// Add a Win32 event & handler for it
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// NB: The handler must call ResetEvent on the event.
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// NB: The caller retains ownership of the event.
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virtual bool addEvent(HANDLE event, EventHandler* ecb);
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// Remove a Win32 event
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virtual void removeEvent(HANDLE event);
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// getMessage
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// Waits for a message to become available on the thread's message queue,
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// and returns it. If any registered events become set while waiting then
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// their handlers are called before returning.
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// Returns zero if the message is WM_QUIT, -1 in case of error, >0 otherwise.
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virtual BOOL getMessage(MSG* msg, HWND hwnd, UINT minMsg, UINT maxMsg);
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protected:
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// checkTimeouts
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// Derived classes should override this to perform any extra processing,
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// returning the maximum number of milliseconds after which the callback
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// should be called again.
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virtual int checkTimeouts();
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HANDLE events[MAXIMUM_WAIT_OBJECTS];
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EventHandler* handlers[MAXIMUM_WAIT_OBJECTS-1];
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unsigned int eventCount;
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};
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};
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};
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#endif
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