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 <plumb.h>
11 #include "dat.h"
12 #include "fns.h"
13
14 static Image *scrtmp;
15
16 static
17 Rectangle
scrpos(Rectangle r,uint p0,uint p1,uint tot)18 scrpos(Rectangle r, uint p0, uint p1, uint tot)
19 {
20 Rectangle q;
21 int h;
22
23 q = r;
24 h = q.max.y-q.min.y;
25 if(tot == 0)
26 return q;
27 if(tot > 1024*1024){
28 tot>>=10;
29 p0>>=10;
30 p1>>=10;
31 }
32 if(p0 > 0)
33 q.min.y += h*p0/tot;
34 if(p1 < tot)
35 q.max.y -= h*(tot-p1)/tot;
36 if(q.max.y < q.min.y+2){
37 if(q.min.y+2 <= r.max.y)
38 q.max.y = q.min.y+2;
39 else
40 q.min.y = q.max.y-2;
41 }
42 return q;
43 }
44
45 void
scrlresize(void)46 scrlresize(void)
47 {
48 freeimage(scrtmp);
49 scrtmp = allocimage(display, Rect(0, 0, 32, screen->r.max.y), screen->chan, 0, DNofill);
50 if(scrtmp == nil)
51 error("scroll alloc");
52 }
53
54 void
textscrdraw(Text * t)55 textscrdraw(Text *t)
56 {
57 Rectangle r, r1, r2;
58 Image *b;
59
60 if(t->w==nil || t!=&t->w->body)
61 return;
62 if(scrtmp == nil)
63 scrlresize();
64 r = t->scrollr;
65 b = scrtmp;
66 r1 = r;
67 r1.min.x = 0;
68 r1.max.x = Dx(r);
69 r2 = scrpos(r1, t->org, t->org+t->nchars, t->file->nc);
70 if(!eqrect(r2, t->lastsr)){
71 t->lastsr = r2;
72 draw(b, r1, t->cols[BORD], nil, ZP);
73 draw(b, r2, t->cols[BACK], nil, ZP);
74 r2.min.x = r2.max.x-1;
75 draw(b, r2, t->cols[BORD], nil, ZP);
76 draw(t->b, r, b, nil, Pt(0, r1.min.y));
77 /*flushimage(display, 1);/*BUG?*/
78 }
79 }
80
81 void
scrsleep(uint dt)82 scrsleep(uint dt)
83 {
84 Timer *timer;
85 static Alt alts[3];
86
87 timer = timerstart(dt);
88 alts[0].c = timer->c;
89 alts[0].v = nil;
90 alts[0].op = CHANRCV;
91 alts[1].c = mousectl->c;
92 alts[1].v = &mousectl->Mouse;
93 alts[1].op = CHANRCV;
94 alts[2].op = CHANEND;
95 for(;;)
96 switch(alt(alts)){
97 case 0:
98 timerstop(timer);
99 return;
100 case 1:
101 timercancel(timer);
102 return;
103 }
104 }
105
106 void
textscroll(Text * t,int but)107 textscroll(Text *t, int but)
108 {
109 uint p0, oldp0;
110 Rectangle s;
111 int x, y, my, h, first;
112
113 s = insetrect(t->scrollr, 1);
114 h = s.max.y-s.min.y;
115 x = (s.min.x+s.max.x)/2;
116 oldp0 = ~0;
117 first = TRUE;
118 do{
119 flushimage(display, 1);
120 my = mouse->xy.y;
121 if(my < s.min.y)
122 my = s.min.y;
123 if(my >= s.max.y)
124 my = s.max.y;
125 if(!eqpt(mouse->xy, Pt(x, my))){
126 moveto(mousectl, Pt(x, my));
127 readmouse(mousectl); /* absorb event generated by moveto() */
128 }
129 if(but == 2){
130 y = my;
131 p0 = (vlong)t->file->nc*(y-s.min.y)/h;
132 if(p0 >= t->q1)
133 p0 = textbacknl(t, p0, 2);
134 if(oldp0 != p0)
135 textsetorigin(t, p0, FALSE);
136 oldp0 = p0;
137 readmouse(mousectl);
138 continue;
139 }
140 if(but == 1)
141 p0 = textbacknl(t, t->org, (my-s.min.y)/t->font->height);
142 else
143 p0 = t->org+frcharofpt(t, Pt(s.max.x, my));
144 if(oldp0 != p0)
145 textsetorigin(t, p0, TRUE);
146 oldp0 = p0;
147 /* debounce */
148 if(first){
149 flushimage(display, 1);
150 sleep(200);
151 nbrecv(mousectl->c, &mousectl->Mouse);
152 first = FALSE;
153 }
154 scrsleep(80);
155 }while(mouse->buttons & (1<<(but-1)));
156 while(mouse->buttons)
157 readmouse(mousectl);
158 }
159