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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
//
// "$Id: fl_scroll_area.cxx,v 1.4.2.3.2.6 2004/04/11 04:39:00 easysw Exp $"
//
// Scrolling routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2004 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//
// Drawing function to move the contents of a rectangle. This is passed
// a "callback" which is called to draw rectangular areas that are moved
// into the drawing area.
#include <FL/Fl.H>
#include <FL/x.H>
// scroll a rectangle and redraw the newly exposed portions:
void fl_scroll(int X, int Y, int W, int H, int dx, int dy,
void (*draw_area)(void*, int,int,int,int), void* data)
{
if (!dx && !dy) return;
if (dx <= -W || dx >= W || dy <= -H || dy >= H) {
// no intersection of old an new scroll
draw_area(data,X,Y,W,H);
return;
}
int src_x, src_w, dest_x, clip_x, clip_w;
if (dx > 0) {
src_x = X;
dest_x = X+dx;
src_w = W-dx;
clip_x = X;
clip_w = dx;
} else {
src_x = X-dx;
dest_x = X;
src_w = W+dx;
clip_x = X+src_w;
clip_w = W-src_w;
}
int src_y, src_h, dest_y, clip_y, clip_h;
if (dy > 0) {
src_y = Y;
dest_y = Y+dy;
src_h = H-dy;
clip_y = Y;
clip_h = dy;
} else {
src_y = Y-dy;
dest_y = Y;
src_h = H+dy;
clip_y = Y+src_h;
clip_h = H-src_h;
}
#ifdef WIN32
BitBlt(fl_gc, dest_x, dest_y, src_w, src_h, fl_gc, src_x, src_y,SRCCOPY);
// NYI: need to redraw areas that the source of BitBlt was bad due to
// overlapped windows, probably similar to X version:
// MRS: basic code needs to redraw parts that scrolled from off-screen...
int temp, limit;
int wx, wy;
// Compute the X position of the current window;
// this only works when scrolling in response to
// a user event; Fl_Window::x/y_root() do not work
// on WIN32...
wx = Fl::event_x_root() - Fl::event_x();
wy = Fl::event_y_root() - Fl::event_y();
temp = wx + src_x;
if (temp < Fl::x()) {
draw_area(data, dest_x, dest_y, Fl::x() - temp, src_h);
}
temp = wx + src_x + src_w;
limit = Fl::x() + Fl::w();
if (temp > limit) {
draw_area(data, dest_x + src_w - temp + limit, dest_y, temp - limit, src_h);
}
temp = wy + src_y;
if (temp < Fl::y()) {
draw_area(data, dest_x, dest_y, src_w, Fl::y() - temp);
}
temp = wy + src_y + src_h;
limit = Fl::y() + Fl::h();
if (temp > limit) {
draw_area(data, dest_x, dest_y + src_h - temp + limit, src_w, temp - limit);
}
#elif defined(__APPLE__)
Rect src = { src_y, src_x, src_y+src_h, src_x+src_w };
Rect dst = { dest_y, dest_x, dest_y+src_h, dest_x+src_w };
static RGBColor bg = { 0xffff, 0xffff, 0xffff }; RGBBackColor( &bg );
static RGBColor fg = { 0x0000, 0x0000, 0x0000 }; RGBForeColor( &fg );
CopyBits( GetPortBitMapForCopyBits( GetWindowPort(fl_window) ),
GetPortBitMapForCopyBits( GetWindowPort(fl_window) ), &src, &dst, srcCopy, 0L);
#else
XCopyArea(fl_display, fl_window, fl_window, fl_gc,
src_x, src_y, src_w, src_h, dest_x, dest_y);
// we have to sync the display and get the GraphicsExpose events! (sigh)
for (;;) {
XEvent e; XWindowEvent(fl_display, fl_window, ExposureMask, &e);
if (e.type == NoExpose) break;
// otherwise assumme it is a GraphicsExpose event:
draw_area(data, e.xexpose.x, e.xexpose.y,
e.xexpose.width, e.xexpose.height);
if (!e.xgraphicsexpose.count) break;
}
#endif
if (dx) draw_area(data, clip_x, dest_y, clip_w, src_h);
if (dy) draw_area(data, X, clip_y, W, clip_h);
}
//
// End of "$Id: fl_scroll_area.cxx,v 1.4.2.3.2.6 2004/04/11 04:39:00 easysw Exp $".
//
|
