Subversion Repositories planix.SVN

#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->nchars, t->file->nc);
        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 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->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->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);
}