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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <plumb.h>
#include "dat.h"
#include "fns.h"
static Image *scrtmp;
static
Rectangle
scrpos(Rectangle r, uint p0, uint p1, uint tot)
{
Rectangle q;
int h;
q = r;
h = q.max.y-q.min.y;
if(tot == 0)
return q;
if(tot > 1024*1024){
tot>>=10;
p0>>=10;
p1>>=10;
}
if(p0 > 0)
q.min.y += h*p0/tot;
if(p1 < tot)
q.max.y -= h*(tot-p1)/tot;
if(q.max.y < q.min.y+2){
if(q.min.y+2 <= r.max.y)
q.max.y = q.min.y+2;
else
q.min.y = q.max.y-2;
}
return q;
}
void
scrlresize(void)
{
freeimage(scrtmp);
scrtmp = allocimage(display, Rect(0, 0, 32, screen->r.max.y), screen->chan, 0, DNofill);
if(scrtmp == nil)
error("scroll alloc");
}
void
textscrdraw(Text *t)
{
Rectangle r, r1, r2;
Image *b;
if(t->w==nil || t!=&t->w->body)
return;
if(scrtmp == nil)
scrlresize();
r = t->scrollr;
b = scrtmp;
r1 = r;
r1.min.x = 0;
r1.max.x = Dx(r);
r2 = scrpos(r1, t->org, t->org+t->fr.nchars, t->file->b.nc);
if(!eqrect(r2, t->lastsr)){
t->lastsr = r2;
draw(b, r1, t->fr.cols[BORD], nil, ZP);
draw(b, r2, t->fr.cols[BACK], nil, ZP);
r2.min.x = r2.max.x-1;
draw(b, r2, t->fr.cols[BORD], nil, ZP);
draw(t->fr.b, r, b, nil, Pt(0, r1.min.y));
/*flushimage(display, 1); // BUG? */
}
}
void
scrsleep(uint dt)
{
Timer *timer;
static Alt alts[3];
timer = timerstart(dt);
alts[0].c = timer->c;
alts[0].v = nil;
alts[0].op = CHANRCV;
alts[1].c = mousectl->c;
alts[1].v = &mousectl->m;
alts[1].op = CHANRCV;
alts[2].op = CHANEND;
for(;;)
switch(alt(alts)){
case 0:
timerstop(timer);
return;
case 1:
timercancel(timer);
return;
}
}
void
textscroll(Text *t, int but)
{
uint p0, oldp0;
Rectangle s;
int x, y, my, h, first;
s = insetrect(t->scrollr, 1);
h = s.max.y-s.min.y;
x = (s.min.x+s.max.x)/2;
oldp0 = ~0;
first = TRUE;
do{
flushimage(display, 1);
my = mouse->xy.y;
if(my < s.min.y)
my = s.min.y;
if(my >= s.max.y)
my = s.max.y;
if(!eqpt(mouse->xy, Pt(x, my))){
moveto(mousectl, Pt(x, my));
readmouse(mousectl); /* absorb event generated by moveto() */
}
if(but == 2){
y = my;
p0 = (vlong)t->file->b.nc*(y-s.min.y)/h;
if(p0 >= t->q1)
p0 = textbacknl(t, p0, 2);
if(oldp0 != p0)
textsetorigin(t, p0, FALSE);
oldp0 = p0;
readmouse(mousectl);
continue;
}
if(but == 1)
p0 = textbacknl(t, t->org, (my-s.min.y)/t->fr.font->height);
else
p0 = t->org+frcharofpt(&t->fr, Pt(s.max.x, my));
if(oldp0 != p0)
textsetorigin(t, p0, TRUE);
oldp0 = p0;
/* debounce */
if(first){
flushimage(display, 1);
sleep(200);
nbrecv(mousectl->c, &mousectl->m);
first = FALSE;
}
scrsleep(80);
}while(mouse->buttons & (1<<(but-1)));
while(mouse->buttons)
readmouse(mousectl);
}
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