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/* Copyright (c) 1992 AT&T - All rights reserved. */
#include <u.h>
#include <libc.h>
#include <libg.h>
#include <frame.h>
#include "flayer.h"
#include "samterm.h"
extern Bitmap *darkgrey;
extern Mouse mouse;
Rectangle
scrpos(Rectangle r, long p0, long p1, long tot)
{
long h;
Rectangle q;
q = inset(r, 1);
h = q.max.y-q.min.y;
if(tot == 0)
return q;
if(tot > 1024L*1024L)
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
scrflip(Flayer *l, Rectangle r)
{
if(rectclip(&r, l->scroll))
bitblt(l->f.b, r.min, l->f.b, r, F&~D);
}
void
scrdraw(Flayer *l, long tot)
{
Rectangle r, r1, r2;
Bitmap *b;
static Bitmap *x;
int h;
if(l->f.b == 0)
panic("scrdraw");
r = l->scroll;
r.min.x += 1; /* border between margin and bar */
r1 = r;
if(l->visible == All){
if(x == 0){
if (screensize(0, &h) == 0)
h = 2048;
x = balloc(Rect(0, 0, 32, h), l->f.b->ldepth);
if(x == 0)
panic("scrdraw balloc");
}
b = x;
r1.min.x = 0;
r1.max.x = Dx(r);
}else
b = l->f.b;
bitblt(b, r1.min, b, r1, F);
texture(b, inset(r1, 1), darkgrey, S);
r2 = scrpos(r1, l->origin, l->origin+l->f.nchars, tot);
bitblt(b, r2.min, b, r2, 0);
if(b!=l->f.b)
bitblt(l->f.b, r.min, b, r1, S);
}
void
scroll(Flayer *l, int pbut, int but)
{
int in = 0, oin;
long tot = scrtotal(l);
Rectangle scr, r, s, rt;
int x, y, my, oy, h;
long p0;
s = inset(l->scroll, 1);
x = s.min.x+FLSCROLLWID/2;
scr = scrpos(l->scroll, l->origin, l->origin+l->f.nchars, tot);
r = scr;
y = scr.min.y;
my = mouse.xy.y;
do{
oin = in;
in = abs(x-mouse.xy.x)<=FLSCROLLWID/2;
if(oin != in)
scrflip(l, r);
if(in){
oy = y;
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)))
cursorset(Pt(x, my));
if(but == 1){
p0 = l->origin-frcharofpt(&l->f, Pt(s.max.x, my));
rt = scrpos(l->scroll, p0, p0+l->f.nchars, tot);
y = rt.min.y;
}else if(but == 2){
y = my;
if(y > s.max.y-2)
y = s.max.y-2;
}else if(but == 3){
p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
rt = scrpos(l->scroll, p0, p0+l->f.nchars, tot);
y = rt.min.y;
}
if(y != oy){
scrflip(l, r);
r = raddp(scr, Pt(0, y-scr.min.y));
scrflip(l, r);
}
}
}while(button(pbut));
if(in){
h = s.max.y-s.min.y;
scrflip(l, r);
p0 = 0;
if(but == 1)
p0 = (long)(my-s.min.y)/l->f.font->height+1;
else if(but == 2){
if(tot > 1024L*1024L)
p0 = ((tot>>10)*(y-s.min.y)/h)<<10;
else
p0 = tot*(y-s.min.y)/h;
}else if(but == 3){
p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
if(p0 > tot)
p0 = tot;
}
scrorigin(l, but, p0);
}
}
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