void
textsetselect(Text *t, uint q0, uint q1)
{
int p0, p1, ticked;
/* t->fr.p0 and t->fr.p1 are always right; t->q0 and t->q1 may be off */
t->q0 = q0;
t->q1 = q1;
/* compute desired p0,p1 from q0,q1 */
p0 = q0-t->org;
p1 = q1-t->org;
ticked = 1;
if(p0 < 0){
ticked = 0;
p0 = 0;
}
if(p1 < 0)
p1 = 0;
if(p0 > t->fr.nchars)
p0 = t->fr.nchars;
if(p1 > t->fr.nchars){
ticked = 0;
p1 = t->fr.nchars;
}
if(p0==t->fr.p0 && p1==t->fr.p1){
if(p0 == p1 && ticked != t->fr.ticked)
frtick(&t->fr, frptofchar(&t->fr, p0), ticked);
return;
}
if(p0 > p1)
sysfatal("acme: textsetselect p0=%d p1=%d q0=%ud q1=%ud t->org=%d nchars=%d", p0, p1, q0, q1, (int)t->org, (int)t->fr.nchars);
/* screen disagrees with desired selection */
if(t->fr.p1<=p0 || p1<=t->fr.p0 || p0==p1 || t->fr.p1==t->fr.p0){
/* no overlap or too easy to bother trying */
frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p0), t->fr.p0, t->fr.p1, 0);
if(p0 != p1 || ticked)
frdrawsel(&t->fr, frptofchar(&t->fr, p0), p0, p1, 1);
goto Return;
}
/* overlap; avoid unnecessary painting */
if(p0 < t->fr.p0){
/* extend selection backwards */
frdrawsel(&t->fr, frptofchar(&t->fr, p0), p0, t->fr.p0, 1);
}else if(p0 > t->fr.p0){
/* trim first part of selection */
frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p0), t->fr.p0, p0, 0);
}
if(p1 > t->fr.p1){
/* extend selection forwards */
frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p1), t->fr.p1, p1, 1);
}else if(p1 < t->fr.p1){
/* trim last part of selection */
frdrawsel(&t->fr, frptofchar(&t->fr, p1), p1, t->fr.p1, 0);
}
Return:
t->fr.p0 = p0;
t->fr.p1 = p1;
}
void
frredraw(Frame *f)
{
int ticked;
Point pt;
if(f->p0 == f->p1) {
ticked = f->ticked;
if(ticked)
frtick(f, frptofchar(f, f->p0), 0);
frdrawsel0(f, frptofchar(f, 0), 0, f->nchars, f->cols[BACK], f->cols[TEXT]);
if(ticked)
frtick(f, frptofchar(f, f->p0), 1);
return;
}
pt = frptofchar(f, 0);
pt = frdrawsel0(f, pt, 0, f->p0, f->cols[BACK], f->cols[TEXT]);
pt = frdrawsel0(f, pt, f->p0, f->p1, f->cols[HIGH], f->cols[HTEXT]);
pt = frdrawsel0(f, pt, f->p1, f->nchars, f->cols[BACK], f->cols[TEXT]);
}
void
frdrawsel(Frame *f, Point pt, uint32_t p0, uint32_t p1, int issel)
{
Image *back, *text;
if(f->ticked)
frtick(f, frptofchar(f, f->p0), 0);
if(p0 == p1) {
frtick(f, pt, issel);
return;
}
if(issel) {
back = f->cols[HIGH];
text = f->cols[HTEXT];
} else {
back = f->cols[BACK];
text = f->cols[TEXT];
}
frdrawsel0(f, pt, p0, p1, back, text);
}
uint
xselect(Frame *f, Mousectl *mc, Image *col, uint *p1p) /* when called, button is down */
{
uint p0, p1, q, tmp;
ulong msec;
Point mp, pt0, pt1, qt;
int reg, b;
mp = mc->xy;
b = mc->buttons;
msec = mc->msec;
/* remove tick */
if(f->p0 == f->p1)
frtick(f, frptofchar(f, f->p0), 0);
p0 = p1 = frcharofpt(f, mp);
pt0 = frptofchar(f, p0);
pt1 = frptofchar(f, p1);
reg = 0;
frtick(f, pt0, 1);
do{
q = frcharofpt(f, mc->xy);
if(p1 != q){
if(p0 == p1)
frtick(f, pt0, 0);
if(reg != region(q, p0)){ /* crossed starting point; reset */
if(reg > 0)
selrestore(f, pt0, p0, p1);
else if(reg < 0)
selrestore(f, pt1, p1, p0);
p1 = p0;
pt1 = pt0;
reg = region(q, p0);
if(reg == 0)
frdrawsel0(f, pt0, p0, p1, col, display->white);
}
qt = frptofchar(f, q);
if(reg > 0){
if(q > p1)
frdrawsel0(f, pt1, p1, q, col, display->white);
else if(q < p1)
selrestore(f, qt, q, p1);
}else if(reg < 0){
if(q > p1)
selrestore(f, pt1, p1, q);
else
frdrawsel0(f, qt, q, p1, col, display->white);
}
p1 = q;
pt1 = qt;
}
if(p0 == p1)
frtick(f, pt0, 1);
flushimage(f->display, 1);
readmouse(mc);
}while(mc->buttons == b);
if(mc->msec-msec < DELAY && p0!=p1
&& abs(mp.x-mc->xy.x)<MINMOVE
&& abs(mp.y-mc->xy.y)<MINMOVE) {
if(reg > 0)
selrestore(f, pt0, p0, p1);
else if(reg < 0)
selrestore(f, pt1, p1, p0);
p1 = p0;
}
if(p1 < p0){
tmp = p0;
p0 = p1;
p1 = tmp;
}
pt0 = frptofchar(f, p0);
if(p0 == p1)
frtick(f, pt0, 0);
selrestore(f, pt0, p0, p1);
/* restore tick */
if(f->p0 == f->p1)
frtick(f, frptofchar(f, f->p0), 1);
flushimage(f->display, 1);
*p1p = p1;
return p0;
}
