1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This 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; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- EventManager.h
// Win32 event manager. Caller supplies event & handler pairs and
// then uses getMessage() in place of ::GetMessage() in the main
// loop. EventManager calls the event handler whenever the event
// is set.
// Ownership of events remains with the caller.
// It is the responsibility of handlers to reset events.
#ifndef __RFB_WIN32_EVENT_MGR_H__
#define __RFB_WIN32_EVENT_MGR_H__
#include <rfb_win32/Win32Util.h>
namespace rfb {
namespace win32 {
class EventHandler {
public:
virtual ~EventHandler() {}
virtual void processEvent(HANDLE event) = 0;
};
class EventManager {
public:
EventManager();
virtual ~EventManager();
// Add a Win32 event & handler for it
// NB: The handler must call ResetEvent on the event.
// NB: The caller retains ownership of the event.
virtual bool addEvent(HANDLE event, EventHandler* ecb);
// Remove a Win32 event
virtual void removeEvent(HANDLE event);
// getMessage
// Waits for a message to become available on the thread's message queue,
// and returns it. If any registered events become set while waiting then
// their handlers are called before returning.
// Returns zero if the message is WM_QUIT, -1 in case of error, >0 otherwise.
virtual BOOL getMessage(MSG* msg, HWND hwnd, UINT minMsg, UINT maxMsg);
protected:
// checkTimeouts
// Derived classes should override this to perform any extra processing,
// returning the maximum number of milliseconds after which the callback
// should be called again.
virtual int checkTimeouts();
HANDLE events[MAXIMUM_WAIT_OBJECTS];
EventHandler* handlers[MAXIMUM_WAIT_OBJECTS-1];
unsigned int eventCount;
};
};
};
#endif
|
