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- #include <u.h>
- #include <libc.h>
- #include <draw.h>
- #include <thread.h>
- #include <mouse.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)) {
- if (l->f.b == nil)
- panic("scrmark: nil l->f.b");
- draw(l->f.b, r, l->f.cols[HIGH], nil, ZP);
- }
- }
- void
- scrunmark(Flayer *l, Rectangle r)
- {
- if(rectclip(&r, l->scroll)) {
- if (l->f.b == nil)
- panic("scrunmark: nil l->f.b");
- 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/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 = abs(x-mousep->xy.x)<=FLSCROLLWID/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)))
- moveto(mousectl, 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){
- scrunmark(l, r);
- r = rectaddpt(scr, Pt(0, y-scr.min.y));
- scrmark(l, r);
- }
- }
- }while(button(but));
- if(in){
- h = s.max.y-s.min.y;
- scrunmark(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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