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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <mouse.h>
#include <cursor.h>
#include <keyboard.h>
#include <frame.h>
#include "flayer.h"
#include "samterm.h"
static Image *scrtmp;
static Image *scrback;
void
scrtemps(void)
{
int h;
if(scrtmp)
return;
if(screensize(0, &h) == 0)
h = 2048;
scrtmp = allocimage(display, Rect(0, 0, 32, h), screen->chan, 0, 0);
scrback = allocimage(display, Rect(0, 0, 32, h), screen->chan, 0, 0);
if(scrtmp==0 || scrback==0)
panic("scrtemps");
}
Rectangle
scrpos(Rectangle r, long p0, long p1, long tot)
{
Rectangle q;
int h;
q = r;
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
scrmark(Flayer *l, Rectangle r)
{
r.max.x--;
if(rectclip(&r, l->scroll))
draw(l->f.b, r, l->f.cols[HIGH], nil, ZP);
}
void
scrunmark(Flayer *l, Rectangle r)
{
if(rectclip(&r, l->scroll))
draw(l->f.b, r, scrback, nil, Pt(0, r.min.y-l->scroll.min.y));
}
void
scrdraw(Flayer *l, long tot)
{
Rectangle r, r1, r2;
Image *b;
scrtemps();
if(l->f.b == 0)
panic("scrdraw");
r = l->scroll;
r1 = r;
if(l->visible == All){
b = scrtmp;
r1.min.x = 0;
r1.max.x = Dx(r);
}else
b = l->f.b;
r2 = scrpos(r1, l->origin, l->origin+l->f.nchars, tot);
if(!eqrect(r2, l->lastsr)){
l->lastsr = r2;
draw(b, r1, l->f.cols[BORD], nil, ZP);
draw(b, r2, l->f.cols[BACK], nil, r2.min);
r2 = r1;
r2.min.x = r2.max.x-1;
draw(b, r2, l->f.cols[BORD], nil, ZP);
if(b!=l->f.b)
draw(l->f.b, r, b, nil, r1.min);
}
}
void
scroll(Flayer *l, int but)
{
int in = 0, oin;
long tot = scrtotal(l);
Rectangle scr, r, s, rt;
int x, y, my, oy, h;
long p0;
s = l->scroll;
x = s.min.x+FLSCROLLWID(l)/2;
scr = scrpos(l->scroll, l->origin, l->origin+l->f.nchars, tot);
r = scr;
y = scr.min.y;
my = mousep->xy.y;
draw(scrback, Rect(0,0,Dx(l->scroll), Dy(l->scroll)), l->f.b, nil, l->scroll.min);
do{
oin = in;
in = (but > 3) || (but == 2) || abs(x-mousep->xy.x)<=FLSCROLLWID(l)/2;
if(oin && !in)
scrunmark(l, r);
if(in){
scrmark(l, r);
oy = y;
my = mousep->xy.y;
if(my < s.min.y)
my = s.min.y;
if(my >= s.max.y)
my = s.max.y;
if(!eqpt(mousep->xy, Pt(x, my))) {
if (but <=3)
moveto(mousectl, Pt(x, my));
}
if(but == 1 || but == 4){
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 || but == 5){
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){
scrunmark(l, r);
r = rectaddpt(scr, Pt(0, y-scr.min.y));
scrmark(l, r);
}
}
}while(but <=3 && button(but));
if(in){
h = s.max.y-s.min.y;
scrunmark(l, r);
p0 = 0;
if(but == 1 || but == 4) {
p0 = (long)(my-s.min.y)/l->f.font->height+1;
if(but == 4)
p0 = (long)2;
but = 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 || but == 5){
p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
if(but == 5)
p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, s.min.y+l->f.font->height+1));
if(p0 > tot)
p0 = tot;
but = 3;
}
scrorigin(l, but, p0);
}
}
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