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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <mouse.h>
#include <frame.h>
static
int
region(int a, int b)
{
if(a < b)
return -1;
if(a == b)
return 0;
return 1;
}
void
frselect(Frame *f, Mousectl *mc) /* when called, button 1 is down */
{
ulong p0, p1, q;
Point mp, pt0, pt1, qt;
int reg, b, scrled;
mp = mc->m.xy;
b = mc->m.buttons;
f->modified = 0;
frdrawsel(f, frptofchar(f, f->p0), f->p0, f->p1, 0);
p0 = p1 = frcharofpt(f, mp);
f->p0 = p0;
f->p1 = p1;
pt0 = frptofchar(f, p0);
pt1 = frptofchar(f, p1);
frdrawsel(f, pt0, p0, p1, 1);
reg = 0;
do{
scrled = 0;
if(f->scroll){
if(mp.y < f->r.min.y){
(*f->scroll)(f, -(f->r.min.y-mp.y)/(int)f->font->height-1);
p0 = f->p1;
p1 = f->p0;
scrled = 1;
}else if(mp.y > f->r.max.y){
(*f->scroll)(f, (mp.y-f->r.max.y)/(int)f->font->height+1);
p0 = f->p0;
p1 = f->p1;
scrled = 1;
}
if(scrled){
if(reg != region(p1, p0))
q = p0, p0 = p1, p1 = q; /* undo the swap that will happen below */
pt0 = frptofchar(f, p0);
pt1 = frptofchar(f, p1);
reg = region(p1, p0);
}
}
q = frcharofpt(f, mp);
if(p1 != q){
if(reg != region(q, p0)){ /* crossed starting point; reset */
if(reg > 0)
frdrawsel(f, pt0, p0, p1, 0);
else if(reg < 0)
frdrawsel(f, pt1, p1, p0, 0);
p1 = p0;
pt1 = pt0;
reg = region(q, p0);
if(reg == 0)
frdrawsel(f, pt0, p0, p1, 1);
}
qt = frptofchar(f, q);
if(reg > 0){
if(q > p1)
frdrawsel(f, pt1, p1, q, 1);
else if(q < p1)
frdrawsel(f, qt, q, p1, 0);
}else if(reg < 0){
if(q > p1)
frdrawsel(f, pt1, p1, q, 0);
else
frdrawsel(f, qt, q, p1, 1);
}
p1 = q;
pt1 = qt;
}
f->modified = 0;
if(p0 < p1) {
f->p0 = p0;
f->p1 = p1;
}
else {
f->p0 = p1;
f->p1 = p0;
}
if(scrled)
(*f->scroll)(f, 0);
flushimage(f->display, 1);
if(!scrled)
readmouse(mc);
mp = mc->m.xy;
}while(mc->m.buttons == b);
}
void
frselectpaint(Frame *f, Point p0, Point p1, Image *col)
{
int n;
Point q0, q1;
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 == nil)
drawerror(f->display, "frselectpaint b==0");
if(p0.y == f->r.max.y)
return;
if(n == 0)
draw(f->b, Rpt(p0, q1), col, nil, ZP);
else{
if(p0.x >= f->r.max.x)
p0.x = f->r.max.x-1;
draw(f->b, Rect(p0.x, p0.y, f->r.max.x, q0.y), col, nil, ZP);
if(n > 1)
draw(f->b, Rect(f->r.min.x, q0.y, f->r.max.x, p1.y),
col, nil, ZP);
draw(f->b, Rect(f->r.min.x, p1.y, q1.x, q1.y),
col, nil, ZP);
}
}
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