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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 needXScrollbar;
bool needYScrollbar;
int bumpScrollX, bumpScrollY;
};
#endif
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