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win/rfb_win32/EventManager.h

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+/* 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