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diff --git a/unix/tx/TXViewport.h b/unix/tx/TXViewport.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.
+ */
+//
+// TXViewport.h
+//
+// A TXViewport allows a large window to be viewed by adding scrollbars to the
+// right and bottom if necessary.  It also has a bump-scroll mode where there
+// are no scrollbars, and scrolling is achieved by bumping up against the edge
+// of the screen instead.  Note that this only works when the viewport fills
+// the entire screen.  If the child window is smaller than the viewport, it is
+// always positioned centrally in the viewport.
+
+#ifndef __TXVIEWPORT_H__
+#define __TXVIEWPORT_H__
+
+#include <rfb/Timer.h>
+#include "TXWindow.h"
+#include "TXScrollbar.h"
+
+class TXViewport : public TXWindow, public TXScrollbarCallback,
+                   public rfb::Timer::Callback {
+public:
+  TXViewport(Display* dpy_, int width, int height, TXWindow* parent_=0);
+  virtual ~TXViewport();
+
+  // setChild() sets the child window which is to be viewed in the viewport.
+  void setChild(TXWindow* child_);
+
+  // setOffset() sets the position of the child in the viewport.  Note that the
+  // offsets are negative.  For example when the offset is (-100,-30), position
+  // (100,30) in the child window is at the top-left of the viewport.  The
+  // offsets given are clipped to keep the child window filling the viewport
+  // (except where the child window is smaller than the viewport, in which case
+  // it is always positioned centrally in the viewport).  It returns true if
+  // the child was repositioned.
+  bool setOffset(int x, int y);
+
+  // setBumpScroll() puts the viewport in bump-scroll mode.
+  void setBumpScroll(bool b);
+
+  // bumpScrollEvent() can be called with a MotionNotify event which may
+  // potentially be against the edge of the screen.  It returns true if the
+  // event was used for bump-scrolling, false if it should be processed
+  // normally.
+  bool bumpScrollEvent(XMotionEvent* ev);
+
+private:
+  virtual void resizeNotify();
+  virtual void scrollbarPos(int x, int y, TXScrollbar* sb);
+  virtual bool handleTimeout(rfb::Timer* timer);
+  TXWindow* clipper;
+  TXWindow* child;
+  TXScrollbar* hScrollbar;
+  TXScrollbar* vScrollbar;
+  const int scrollbarSize;
+  int xOff, yOff;
+  rfb::Timer bumpScrollTimer;
+  bool bumpScroll;
+  bool needScrollbars;
+  int bumpScrollX, bumpScrollY;
+};
+#endif