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frselect.c

/* Copyright (c) 1992 AT&T - All rights reserved. */
#include <u.h>
#include <libc.h>
#include <libg.h>
#include <frame.h>

void
frselect(Frame *f, Mouse *m)  /* when called, button 1 is down */
{
      ulong p0, p1, q;
      Point mp, pt0, pt1, qt;
      int b;

      b = m->buttons;
      mp = m->xy;

    Again:
      f->modified = 0;
      frselectp(f, F&~D);
      p0 = p1 = frcharofpt(f, mp);
      pt0 = frptofchar(f, p0);
      pt1 = frptofchar(f, p1);
      frselectf(f, pt0, pt1, F&~D);
      do{
            if(f->modified)   /* special hack so 8½ can frselect in parallel */
                  goto Again;
            q = frcharofpt(f, m->xy);
            if(p1 != q){
                  if(p0 == p1)
                        frselectf(f, pt0, pt1, F&~D);
                  qt = frptofchar(f, q);
                  if(p1 < q)
                        frselectf(f, pt1, qt, F&~D);
                  else
                        frselectf(f, qt, pt1, F&~D);
                  p1 = q;
                  pt1 = qt;
                  if(p0 == p1)
                        frselectf(f, pt0, pt1, F&~D);
            }
            f->modified = 0;
            if(p0 < p1)
                  f->p0 = p0, f->p1 = p1;
            else
                  f->p0 = p1, f->p1 = p0;
            frgetmouse();
      }while(m->buttons == b);
}
/* it is assumed p0<=p1 and both were generated by frptofchar() */
void
frselectf(Frame *f, Point p0, Point p1, Fcode c)
{
      int n;
      Point q0, q1;

      if(p0.x == f->left)
            p0.x = f->r.min.x;
      if(p1.x == f->left)
            p1.x = f->r.min.x;
      q0 = p0;
      q1 = p1;
      q0.y += f->font->height;
      q1.y += f->font->height;
      n = (p1.y-p0.y)/f->font->height;
      if(f->b == 0)
            berror("frselectf b==0");
      if(p0.y == f->r.max.y)
            return;
      if(n == 0){
            if(p0.x == p1.x)
                  if(p0.x == f->r.min.x)
                        q1.x++;
                  else
                        p0.x--;
            bitblt(f->b, p0, f->b, Rpt(p0, q1), c);
      }else{
            if(p0.x >= f->r.max.x)
                  p0.x = f->r.max.x-1;
            bitblt(f->b, p0, f->b, Rect(p0.x, p0.y, f->r.max.x, q0.y), c);
            if(n > 1)
                  bitblt(f->b, Pt(f->r.min.x, q0.y),
                        f->b, Rect(f->r.min.x, q0.y, f->r.max.x, p1.y), c);
            bitblt(f->b, Pt(f->r.min.x, p1.y),
                        f->b, Rect(f->r.min.x, p1.y, q1.x, q1.y), c);
      }
}

void
frselectp(Frame *f, Fcode c)
{
      Point pt0, pt1;

      pt0 = frptofchar(f, f->p0);
      pt1 = (f->p0==f->p1)? pt0 : frptofchar(f, f->p1);
      frselectf(f, pt0, pt1, c);
}

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