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https://github.com/TigerVNC/tigervnc.git
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47ed8d321c
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2 3789f03b-4d11-0410-bbf8-ca57d06f2519
83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
/* Copyright (C) 2002-2003 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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//
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// TXScrollbar.h
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//
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// A TXScrollbar represents a range of values starting at start, of length len,
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// between zero and limit. The vertical argument to the constructor says
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// whether the scrollbar is horizontal or vertical.
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//
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// In fact it can represent a range in each dimension but usually one of the
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// dimensions is fixed, according to the vertical flag (for a vertical
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// scrollbar, the horizontal dimension is fixed, and vice-versa).
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//
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// The TXScrollbarCallback argument is an object which will be notified when
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// the user has attempted to move the scrollbar. The x and y arguments to the
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// scrollbarPos() method give the start values in the respective dimensions.
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// They are guaranteed to be between 0 and limit-len.
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//
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#ifndef __TXSCROLLBAR_H__
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#define __TXSCROLLBAR_H__
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#include "TXWindow.h"
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class TXScrollbarCallback;
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class TXScrollbar : public TXWindow, public TXEventHandler {
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public:
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TXScrollbar(Display* dpy_, int width=1, int height=1, bool vertical=false,
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TXScrollbarCallback* cb=0, TXWindow* parent_=0);
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virtual ~TXScrollbar();
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// set() sets the limit, start and length of the range represented by the
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// scrollbar. The values of limit and len passed in must be valid
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// (i.e. limit > 0 and 0 <= len <= limit). Values of start are clipped to
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// the range 0 to limit-len.
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void set(int limit, int start, int len) { set(limit, start, len, vertical); }
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// set() with an extra argument vert can be used to represent a range in both
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// dimensions simultaneously.
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void set(int limit, int start, int len, bool vert);
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virtual void handleEvent(TXWindow* w, XEvent* ev);
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private:
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int scaleToBarX(int x) { return (x * width() + limit[0]/2) / limit[0]; }
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int scaleToBarY(int y) { return (y * height() + limit[1]/2) / limit[1]; }
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int barToScaleX(int x) { return (x * limit[0] + width()/2) / width(); }
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int barToScaleY(int y) { return (y * limit[1] + height()/2) / height(); }
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void paint();
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GC gc;
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TXScrollbarCallback* cb;
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int limit[2];
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int start[2];
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int len[2];
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int xDown, yDown;
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int xStart, yStart;
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bool vertical;
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bool clickedInThumb;
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};
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class TXScrollbarCallback {
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public:
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virtual void scrollbarPos(int x, int y, TXScrollbar* sb)=0;
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};
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#endif
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