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win/rfb_win32/WMHooks.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.
+ */
+
+// -=- WMHooks.h
+
+#ifndef __RFB_WIN32_WM_HOOKS_H__
+#define __RFB_WIN32_WM_HOOKS_H__
+
+#include <windows.h>
+#include <rfb/UpdateTracker.h>
+#include <rdr/Exception.h>
+#include <rfb_win32/Win32Util.h>
+
+namespace rfb {
+
+  namespace win32 {
+
+    // -=- WMHooks
+    //     Uses the wm_hooks DLL to intercept window messages, to get _hints_ as
+    //     to what may have changed on-screen.  Updates are notified via a Win32
+    //     event, and retrieved using the getUpdates method, which is thread-safe.
+    class WMHooks {
+    public:
+      WMHooks();
+      ~WMHooks();
+
+      // Specify the event object to notify.  Starts the hook subsystem if it is
+      // not already active, and returns false if the hooks fail to start.
+      bool setEvent(HANDLE updateEvent);
+
+      // Copies any new updates to the UpdateTracker.  Returns true if new updates
+      // were added, false otherwise.
+      bool getUpdates(UpdateTracker* ut);
+
+#ifdef _DEBUG
+      // Get notifications of any messages in the given range, to any hooked window
+      void setDiagnosticRange(UINT min, UINT max);
+#endif
+
+      // * INTERNAL NOTIFICATION FUNCTION * 
+      void NotifyHooksRegion(const Region& r);
+    protected:
+      HANDLE updateEvent;
+      bool updatesReady;
+      SimpleUpdateTracker updates;
+    };
+
+    // -=- Support for filtering out local input events while remote connections are
+    //     active.  Implemented using SetWindowsHookEx for portability.
+    class WMBlockInput {
+    public:
+      WMBlockInput();
+      ~WMBlockInput();
+      bool blockInputs(bool block);
+    protected:
+      bool active;
+    };
+
+  };
+
+};
+
+#endif // __RFB_WIN32_WM_HOOKS_H__