tscrl.c - plan9port - [fork] Plan 9 from user space
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tscrl.c (3271B)
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1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <thread.h>
5 #include <cursor.h>
6 #include <mouse.h>
7 #include <keyboard.h>
8 #include <frame.h>
9 #include <fcall.h>
10 #include "dat.h"
11 #include "fns.h"
12
13 static Image *scrtmp;
14
15 static
16 void
17 scrtemps(void)
18 {
19 int h;
20
21 if(scrtmp)
22 return;
23 h = BIG*Dy(screen->r);
24 scrtmp = allocimage(display, Rect(0, 0, 32, h), screen->chan, 0, DWhite);
25 if(scrtmp == nil)
26 error("scrtemps");
27 }
28
29 void
30 freescrtemps(void)
31 {
32 freeimage(scrtmp);
33 scrtmp = nil;
34 }
35
36 static
37 Rectangle
38 scrpos(Rectangle r, uint p0, uint p1, uint tot)
39 {
40 Rectangle q;
41 int h;
42
43 q = r;
44 h = q.max.y-q.min.y;
45 if(tot == 0)
46 return q;
47 if(tot > 1024*1024){
48 tot>>=10;
49 p0>>=10;
50 p1>>=10;
51 }
52 if(p0 > 0)
53 q.min.y += h*p0/tot;
54 if(p1 < tot)
55 q.max.y -= h*(tot-p1)/tot;
56 if(q.max.y < q.min.y+2){
57 if(q.min.y+2 <= r.max.y)
58 q.max.y = q.min.y+2;
59 else
60 q.min.y = q.max.y-2;
61 }
62 return q;
63 }
64
65 void
66 wscrdraw(Window *w)
67 {
68 Rectangle r, r1, r2;
69 Image *b;
70
71 scrtemps();
72 if(w->i == nil)
73 error("scrdraw");
74 r = w->scrollr;
75 b = scrtmp;
76 r1 = r;
77 r1.min.x = 0;
78 r1.max.x = Dx(r);
79 r2 = scrpos(r1, w->org, w->org+w->f.nchars, w->nr);
80 if(!eqrect(r2, w->lastsr)){
81 w->lastsr = r2;
82 /* move r1, r2 to (0,0) to avoid clipping */
83 r2 = rectsubpt(r2, r1.min);
84 r1 = rectsubpt(r1, r1.min);
85 draw(b, r1, w->f.cols[BORD], nil, ZP);
86 draw(b, r2, w->f.cols[BACK], nil, ZP);
87 r2.min.x = r2.max.x-1;
88 draw(b, r2, w->f.cols[BORD], nil, ZP);
89 draw(w->i, r, b, nil, Pt(0, r1.min.y));
90 }
91 }
92
93 void
94 wscrsleep(Window *w, uint dt)
95 {
96 Timer *timer;
97 int y, b;
98 static Alt alts[3];
99
100 timer = timerstart(dt);
101 y = w->mc.m.xy.y;
102 b = w->mc.m.buttons;
103 alts[0].c = timer->c;
104 alts[0].v = nil;
105 alts[0].op = CHANRCV;
106 alts[1].c = w->mc.c;
107 alts[1].v = &w->mc.m;
108 alts[1].op = CHANRCV;
109 alts[2].op = CHANEND;
110 for(;;)
111 switch(alt(alts)){
112 case 0:
113 timerstop(timer);
114 return;
115 case 1:
116 if(abs(w->mc.m.xy.y-y)>2 || w->mc.m.buttons!=b){
117 timercancel(timer);
118 return;
119 }
120 break;
121 }
122 }
123
124 void
125 wscroll(Window *w, int but)
126 {
127 uint p0, oldp0;
128 Rectangle s;
129 int x, y, my, h, first;
130
131 s = insetrect(w->scrollr, 1);
132 h = s.max.y-s.min.y;
133 x = (s.min.x+s.max.x)/2;
134 oldp0 = ~0;
135 first = TRUE;
136 do{
137 flushimage(display, 1);
138 if(w->mc.m.xy.x<s.min.x || s.max.x<=w->mc.m.xy.x){
139 readmouse(&w->mc);
140 }else{
141 my = w->mc.m.xy.y;
142 if(my < s.min.y)
143 my = s.min.y;
144 if(my >= s.max.y)
145 my = s.max.y;
146 if(!eqpt(w->mc.m.xy, Pt(x, my))){
147 wmovemouse(w, Pt(x, my));
148 readmouse(&w->mc); /* absorb event generated by moveto() */
149 }
150 if(but == 2){
151 y = my;
152 if(y > s.max.y-2)
153 y = s.max.y-2;
154 if(w->nr > 1024*1024)
155 p0 = ((w->nr>>10)*(y-s.min.y)/h)<<10;
156 else
157 p0 = w->nr*(y-s.min.y)/h;
158 if(oldp0 != p0)
159 wsetorigin(w, p0, FALSE);
160 oldp0 = p0;
161 readmouse(&w->mc);
162 continue;
163 }
164 if(but == 1)
165 p0 = wbacknl(w, w->org, (my-s.min.y)/w->f.font->height);
166 else
167 p0 = w->org+frcharofpt(&w->f, Pt(s.max.x, my));
168 if(oldp0 != p0)
169 wsetorigin(w, p0, TRUE);
170 oldp0 = p0;
171 /* debounce */
172 if(first){
173 flushimage(display, 1);
174 sleep(200);
175 nbrecv(w->mc.c, &w->mc.m);
176 first = FALSE;
177 }
178 wscrsleep(w, 100);
179 }
180 }while(w->mc.m.buttons & (1<<(but-1)));
181 while(w->mc.m.buttons)
182 readmouse(&w->mc);
183 }