1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/* 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.
*/
//
// TXScrollbar.h
//
// A TXScrollbar represents a range of values starting at start, of length len,
// between zero and limit. The vertical argument to the constructor says
// whether the scrollbar is horizontal or vertical.
//
// In fact it can represent a range in each dimension but usually one of the
// dimensions is fixed, according to the vertical flag (for a vertical
// scrollbar, the horizontal dimension is fixed, and vice-versa).
//
// The TXScrollbarCallback argument is an object which will be notified when
// the user has attempted to move the scrollbar. The x and y arguments to the
// scrollbarPos() method give the start values in the respective dimensions.
// They are guaranteed to be between 0 and limit-len.
//
#ifndef __TXSCROLLBAR_H__
#define __TXSCROLLBAR_H__
#include "TXWindow.h"
class TXScrollbarCallback;
class TXScrollbar : public TXWindow, public TXEventHandler {
public:
TXScrollbar(Display* dpy_, int width=1, int height=1, bool vertical=false,
TXScrollbarCallback* cb=0, TXWindow* parent_=0);
virtual ~TXScrollbar();
// set() sets the limit, start and length of the range represented by the
// scrollbar. The values of limit and len passed in must be valid
// (i.e. limit > 0 and 0 <= len <= limit). Values of start are clipped to
// the range 0 to limit-len.
void set(int limit, int start, int len) { set(limit, start, len, vertical); }
// set() with an extra argument vert can be used to represent a range in both
// dimensions simultaneously.
void set(int limit, int start, int len, bool vert);
virtual void handleEvent(TXWindow* w, XEvent* ev);
private:
int scaleToBarX(int x) { return (x * width() + limit[0]/2) / limit[0]; }
int scaleToBarY(int y) { return (y * height() + limit[1]/2) / limit[1]; }
int barToScaleX(int x) { return (x * limit[0] + width()/2) / width(); }
int barToScaleY(int y) { return (y * limit[1] + height()/2) / height(); }
void paint();
GC gc;
TXScrollbarCallback* cb;
int limit[2];
int start[2];
int len[2];
int xDown, yDown;
int xStart, yStart;
bool vertical;
bool clickedInThumb;
};
class TXScrollbarCallback {
public:
virtual void scrollbarPos(int x, int y, TXScrollbar* sb)=0;
};
#endif
|
