tscroll.c - plan9port - [fork] Plan 9 from user space
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tscroll.c (3328B)
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1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <thread.h>
5 #include <mouse.h>
6 #include <cursor.h>
7 #include <keyboard.h>
8 #include <frame.h>
9 #include "flayer.h"
10 #include "samterm.h"
11
12 static Image *scrtmp;
13 static Image *scrback;
14
15 void
16 scrtemps(void)
17 {
18 int h;
19
20 if(scrtmp)
21 return;
22 if(screensize(0, &h) == 0)
23 h = 2048;
24 scrtmp = allocimage(display, Rect(0, 0, 32, h), screen->chan, 0, 0);
25 scrback = allocimage(display, Rect(0, 0, 32, h), screen->chan, 0, 0);
26 if(scrtmp==0 || scrback==0)
27 panic("scrtemps");
28 }
29
30 Rectangle
31 scrpos(Rectangle r, long p0, long p1, long tot)
32 {
33 Rectangle q;
34 int h;
35
36 q = r;
37 h = q.max.y-q.min.y;
38 if(tot == 0)
39 return q;
40 if(tot > 1024L*1024L)
41 tot>>=10, p0>>=10, p1>>=10;
42 if(p0 > 0)
43 q.min.y += h*p0/tot;
44 if(p1 < tot)
45 q.max.y -= h*(tot-p1)/tot;
46 if(q.max.y < q.min.y+2){
47 if(q.min.y+2 <= r.max.y)
48 q.max.y = q.min.y+2;
49 else
50 q.min.y = q.max.y-2;
51 }
52 return q;
53 }
54
55 void
56 scrmark(Flayer *l, Rectangle r)
57 {
58 r.max.x--;
59 if(rectclip(&r, l->scroll))
60 draw(l->f.b, r, l->f.cols[HIGH], nil, ZP);
61 }
62
63 void
64 scrunmark(Flayer *l, Rectangle r)
65 {
66 if(rectclip(&r, l->scroll))
67 draw(l->f.b, r, scrback, nil, Pt(0, r.min.y-l->scroll.min.y));
68 }
69
70 void
71 scrdraw(Flayer *l, long tot)
72 {
73 Rectangle r, r1, r2;
74 Image *b;
75
76 scrtemps();
77 if(l->f.b == 0)
78 panic("scrdraw");
79 r = l->scroll;
80 r1 = r;
81 if(l->visible == All){
82 b = scrtmp;
83 r1.min.x = 0;
84 r1.max.x = Dx(r);
85 }else
86 b = l->f.b;
87 r2 = scrpos(r1, l->origin, l->origin+l->f.nchars, tot);
88 if(!eqrect(r2, l->lastsr)){
89 l->lastsr = r2;
90 draw(b, r1, l->f.cols[BORD], nil, ZP);
91 draw(b, r2, l->f.cols[BACK], nil, r2.min);
92 r2 = r1;
93 r2.min.x = r2.max.x-1;
94 draw(b, r2, l->f.cols[BORD], nil, ZP);
95 if(b!=l->f.b)
96 draw(l->f.b, r, b, nil, r1.min);
97 }
98 }
99
100 void
101 scroll(Flayer *l, int but)
102 {
103 int in = 0, oin;
104 long tot = scrtotal(l);
105 Rectangle scr, r, s, rt;
106 int x, y, my, oy, h;
107 long p0;
108
109 s = l->scroll;
110 x = s.min.x+FLSCROLLWID(l)/2;
111 scr = scrpos(l->scroll, l->origin, l->origin+l->f.nchars, tot);
112 r = scr;
113 y = scr.min.y;
114 my = mousep->xy.y;
115 draw(scrback, Rect(0,0,Dx(l->scroll), Dy(l->scroll)), l->f.b, nil, l->scroll.min);
116 do{
117 oin = in;
118 in = abs(x-mousep->xy.x)<=FLSCROLLWID(l)/2;
119 if(oin && !in)
120 scrunmark(l, r);
121 if(in){
122 scrmark(l, r);
123 oy = y;
124 my = mousep->xy.y;
125 if(my < s.min.y)
126 my = s.min.y;
127 if(my >= s.max.y)
128 my = s.max.y;
129 if(!eqpt(mousep->xy, Pt(x, my)))
130 moveto(mousectl, Pt(x, my));
131 if(but == 1){
132 p0 = l->origin-frcharofpt(&l->f, Pt(s.max.x, my));
133 rt = scrpos(l->scroll, p0, p0+l->f.nchars, tot);
134 y = rt.min.y;
135 }else if(but == 2){
136 y = my;
137 if(y > s.max.y-2)
138 y = s.max.y-2;
139 }else if(but == 3){
140 p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
141 rt = scrpos(l->scroll, p0, p0+l->f.nchars, tot);
142 y = rt.min.y;
143 }
144 if(y != oy){
145 scrunmark(l, r);
146 r = rectaddpt(scr, Pt(0, y-scr.min.y));
147 scrmark(l, r);
148 }
149 }
150 }while(button(but));
151 if(in){
152 h = s.max.y-s.min.y;
153 scrunmark(l, r);
154 p0 = 0;
155 if(but == 1)
156 p0 = (long)(my-s.min.y)/l->f.font->height+1;
157 else if(but == 2){
158 if(tot > 1024L*1024L)
159 p0 = ((tot>>10)*(y-s.min.y)/h)<<10;
160 else
161 p0 = tot*(y-s.min.y)/h;
162 }else if(but == 3){
163 p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
164 if(p0 > tot)
165 p0 = tot;
166 }
167 scrorigin(l, but, p0);
168 }
169 }