ref: c3ba64f6935322f09b6de5c2285544fd471c605d
dir: /sys/src/cmd/abaco/scrl.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <plumb.h>
#include <html.h>
#include "dat.h"
#include "fns.h"
static Image *vscrtmp;
static Image *hscrtmp;
void
scrlresize(void)
{
freeimage(vscrtmp);
freeimage(hscrtmp);
vscrtmp = eallocimage(display, Rect(0, 0, 32, screen->r.max.y), screen->chan, 0, DNofill);
hscrtmp = eallocimage(display, Rect(0, 0, screen->r.max.x, 32), screen->chan, 0, DNofill);
}
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
textscrdraw(Text *t)
{
Rectangle r, r1, r2;
Image *b;
if(vscrtmp == nil)
scrlresize();
r = t->scrollr;
b = vscrtmp;
r1 = r;
r1.min.x = 0;
r1.max.x = Dx(r);
r2 = scrpos(r1, t->org, t->org+t->nchars, t->rs.nr);
if(!eqrect(r2, t->lastsr)){
t->lastsr = r2;
draw(b, r1, t->cols[BORD], nil, ZP);
draw(b, r2, t->cols[BACK], nil, ZP);
r2.min.x = r2.max.x-1;
draw(b, r2, t->cols[BORD], nil, ZP);
draw(t->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->Mouse;
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 y, my, h, first;
s = insetrect(t->scrollr, 1);
h = s.max.y-s.min.y;
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(but == 2){
y = my;
p0 = (vlong)t->rs.nr*(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->font->height);
else
p0 = t->org+frcharofpt(t, 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->Mouse);
first = FALSE;
}
scrsleep(80);
}while(mouse->buttons & (1<<(but-1)));
while(mouse->buttons)
readmouse(mousectl);
}
enum
{
Scrbord = 1,
};
void
pagescrldraw(Page *p)
{
Rectangle r1;
int t, d, l, h;
if(vscrtmp == nil)
scrlresize();
r1 = Rect(0,0,Dx(p->hscrollr), Dy(p->hscrollr));
d = Dx(r1);
t = Dx(p->lay->r);
l = muldiv(p->pos.x, d, t);
h = muldiv(p->pos.x+d, d, t);
draw(hscrtmp, r1, tagcols[HIGH], nil, ZP);
r1.max.x = r1.min.x+h;
r1.min.x += l;
r1.min.y += Scrbord;
r1.max.y -= Scrbord;
draw(hscrtmp, r1, tagcols[BACK], nil, ZP);
r1 = Rect(0,0,Dx(p->vscrollr), Dy(p->vscrollr));
d = Dy(r1);
t = Dy(p->lay->r);
l = muldiv(p->pos.y, d, t);
h = muldiv(p->pos.y+d, d, t);
draw(vscrtmp, r1, tagcols[HIGH], nil, ZP);
r1.max.y = r1.min.y+h;
r1.min.y += l;
r1.max.x -= Scrbord;
r1.min.x += Scrbord;
draw(vscrtmp, r1, tagcols[BACK], nil, ZP);
draw(screen, p->vscrollr, vscrtmp, nil, vscrtmp->r.min);
draw(screen, p->hscrollr, hscrtmp, nil, hscrtmp->r.min);
}
void
pagescroll(Page *p, int but, int horizontal)
{
uint oldp0, p0;
Rectangle s;
int m, om, first, d, size;
int smin, smax, ss, *pos;
if(horizontal){
s = insetrect(p->hscrollr, 1);
ss = s.max.x - s.min.x;
d = Dx(p->r);
size = Dx(p->lay->r);
p0 = p->pos.x;
pos = &p->pos.x;
smin = s.min.x;
smax = s.max.x;
om = mouse->xy.x;
}else{
s = insetrect(p->vscrollr, 1);
ss = s.max.y-s.min.y;
d = Dy(p->r);
size = Dy(p->lay->r);
p0 = p->pos.y;
pos = &p->pos.y;
smin = s.min.y;
smax = s.max.y;
om = mouse->xy.y;
}
oldp0 = ~0;
first = TRUE;
do{
flushimage(display, 1);
if(horizontal)
m = mouse->xy.x;
else
m = mouse->xy.y;
if(but != 2){
if(m > om)
m += (m-om)*Panspeed;
else if(m < om)
m -= (om-m)*Panspeed;
}
if(m < smin)
m = smin;
if(m > smax)
m = smax;
om = m;
if(but == 2){
p0 = muldiv(m-smin, size, ss);
p0 = max(p0, 0);
p0 = min(p0,size-d);
if(oldp0 != p0){
*pos = p0;
pageredraw(p);
}
oldp0 = p0;
readmouse(mousectl);
continue;
}
if(but == 1)
p0 -= (d/2);
else
p0 += d/2;
p0 = min(p0, size-d);
p0 = max(p0, 0);
if(oldp0 != p0){
*pos = p0;
pageredraw(p);
}
oldp0 = p0;
/* debounce */
if(first){
flushimage(display, 1);
sleep(200);
nbrecv(mousectl->c, &mousectl->Mouse);
first = FALSE;
}
scrsleep(80);
}while(mouse->buttons & (1<<(but-1)));
while(mouse->buttons)
readmouse(mousectl);
}
int
pagescrollxy(Page *p, int x, int y)
{
int scrled;
scrled = FALSE;
if(x != 0){
p->pos.x += x;
p->pos.x = max(p->pos.x, 0);
p->pos.x = min(p->pos.x, Dx(p->lay->r)-Dx(p->r));
scrled =TRUE;
}
if(y != 0){
p->pos.y += y;
p->pos.y = max(p->pos.y, 0);
p->pos.y = min(p->pos.y, Dy(p->lay->r)-Dy(p->r));
scrled =TRUE;
}
return scrled;
}