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diff --git a/vncviewer/BaseTouchHandler.h b/vncviewer/BaseTouchHandler.h
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+/* Copyright 2019 Aaron Sowry for Cendio AB
+ * Copyright 2019-2020 Pierre Ossman for Cendio AB
+ * 
+ * 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.
+ */
+
+#ifndef __BASETOUCHHANDLER_H__
+#define __BASETOUCHHANDLER_H__
+
+#include "GestureEvent.h"
+
+class BaseTouchHandler {
+  public:
+    virtual ~BaseTouchHandler();
+
+  protected:
+    BaseTouchHandler();
+
+  protected:
+    virtual void fakeMotionEvent(const GestureEvent origEvent) = 0;
+    virtual void fakeButtonEvent(bool press, int button,
+                                 const GestureEvent origEvent) = 0;
+    virtual void fakeKeyEvent(bool press, int keycode,
+                              const GestureEvent origEvent) = 0;
+
+    virtual void handleGestureEvent(const GestureEvent& event);
+
+  private:
+    void handleTapEvent(const GestureEvent& ev, int buttonEvent);
+
+    double lastMagnitudeX;
+    double lastMagnitudeY;
+
+    GestureEvent firstDoubleTapEvent;
+    struct timeval lastTapTime;
+};
+
+#endif