ref: a7a315bff61bff58a9c918294f53c1e87d7ae7bb
dir: /sys/src/libframe/frinsert.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <mouse.h>
#include <frame.h>
#define DELTA 25
#define TMPSIZE 256
static Frame frame;
static
Point
bxscan(Frame *f, Rune *sp, Rune *ep, Point *ppt)
{
int w, c, nb, delta, nl, nr, rw;
Frbox *b;
char *s, tmp[TMPSIZE+3]; /* +3 for rune overflow */
uchar *p;
frame.r = f->r;
frame.b = f->b;
frame.font = f->font;
frame.maxtab = f->maxtab;
frame.nbox = 0;
frame.nchars = 0;
memmove(frame.cols, f->cols, sizeof frame.cols);
delta = DELTA;
nl = 0;
for(nb=0; sp<ep && nl<=f->maxlines; nb++,frame.nbox++){
if(nb == frame.nalloc){
_frgrowbox(&frame, delta);
if(delta < 10000)
delta *= 2;
}
b = &frame.box[nb];
c = *sp;
if(c=='\t' || c=='\n'){
b->bc = c;
b->wid = 5000;
b->minwid = (c=='\n')? 0 : stringwidth(frame.font, " ");
b->nrune = -1;
if(c=='\n')
nl++;
frame.nchars++;
sp++;
}else{
s = tmp;
nr = 0;
w = 0;
while(sp < ep){
c = *sp;
if(c=='\t' || c=='\n')
break;
rw = runetochar(s, sp);
if(s+rw >= tmp+TMPSIZE)
break;
w += runestringnwidth(frame.font, sp, 1);
sp++;
s += rw;
nr++;
}
*s++ = 0;
p = _frallocstr(f, s-tmp);
b = &frame.box[nb];
b->ptr = p;
memmove(p, tmp, s-tmp);
b->wid = w;
b->nrune = nr;
frame.nchars += nr;
}
}
_frcklinewrap0(f, ppt, &frame.box[0]);
return _frdraw(&frame, *ppt);
}
static
void
chopframe(Frame *f, Point pt, ulong p, int bn)
{
Frbox *b, *eb;
eb = &f->box[f->nbox];
for(b = &f->box[bn]; b < eb; b++){
_frcklinewrap(f, &pt, b);
if(pt.y >= f->r.max.y)
break;
p += NRUNE(b);
_fradvance(f, &pt, b);
}
f->nchars = p;
f->nlines = f->maxlines;
if(b < eb) /* BUG */
_frdelbox(f, (int)(b-f->box), f->nbox-1);
}
void
frinsert(Frame *f, Rune *sp, Rune *ep, ulong p0)
{
Point pt0, pt1, opt0, ppt0, ppt1, pt;
Frbox *b;
int n, n0, nn0, y;
ulong cn0;
Image *back, *text;
Rectangle r;
static struct{
Point pt0, pt1;
}*pts;
static int nalloc=0;
int npts;
if(p0>f->nchars || sp==ep || f->b==nil)
return;
n0 = _frfindbox(f, 0, 0, p0);
cn0 = p0;
nn0 = n0;
pt0 = _frptofcharnb(f, p0, n0);
ppt0 = pt0;
opt0 = pt0;
pt1 = bxscan(f, sp, ep, &ppt0);
ppt1 = pt1;
if(n0 < f->nbox){
_frcklinewrap(f, &pt0, b = &f->box[n0]); /* for frdrawsel() */
_frcklinewrap0(f, &ppt1, b);
}
f->modified = 1;
/*
* ppt0 and ppt1 are start and end of insertion as they will appear when
* insertion is complete. pt0 is current location of insertion position
* (p0); pt1 is terminal point (without line wrap) of insertion.
*/
if(f->p0 == f->p1)
frtick(f, frptofchar(f, f->p0), 0);
/*
* Find point where old and new x's line up
* Invariants:
* pt0 is where the next box (b, n0) is now
* pt1 is where it will be after the insertion
* If pt1 goes off the rectangle, we can toss everything from there on
*/
for(b = &f->box[n0],npts=0;
pt1.x!=pt0.x && pt1.y!=f->r.max.y && n0<f->nbox; b++,n0++,npts++){
_frcklinewrap(f, &pt0, b);
_frcklinewrap0(f, &pt1, b);
if(b->nrune > 0){
n = _frcanfit(f, pt1, b);
if(n == 0)
drawerror(f->display, "_frcanfit==0");
if(n != b->nrune){
_frsplitbox(f, n0, n);
b = &f->box[n0];
}
}
if(npts == nalloc){
pts = realloc(pts, (npts+DELTA)*sizeof(pts[0]));
nalloc += DELTA;
b = &f->box[n0];
}
pts[npts].pt0 = pt0;
pts[npts].pt1 = pt1;
/* has a text box overflowed off the frame? */
if(pt1.y == f->r.max.y)
break;
_fradvance(f, &pt0, b);
pt1.x += _frnewwid(f, pt1, b);
cn0 += NRUNE(b);
}
if(pt1.y > f->r.max.y)
drawerror(f->display, "frinsert pt1 too far");
if(pt1.y==f->r.max.y && n0<f->nbox){
f->nchars -= _frstrlen(f, n0);
_frdelbox(f, n0, f->nbox-1);
}
if(n0 == f->nbox)
f->nlines = (pt1.y-f->r.min.y)/f->font->height+(pt1.x>f->r.min.x);
else if(pt1.y!=pt0.y){
int q0, q1;
y = f->r.max.y;
q0 = pt0.y+f->font->height;
q1 = pt1.y+f->font->height;
f->nlines += (q1-q0)/f->font->height;
if(f->nlines > f->maxlines)
chopframe(f, ppt1, p0, nn0);
if(pt1.y < y){
r = f->r;
r.min.y = q1;
r.max.y = y;
if(q1 < y)
draw(f->b, r, f->b, nil, Pt(f->r.min.x, q0));
r.min = pt1;
r.max.x = pt1.x+(f->r.max.x-pt0.x);
r.max.y = q1;
draw(f->b, r, f->b, nil, pt0);
}
}
/*
* Move the old stuff down to make room. The loop will move the stuff
* between the insertion and the point where the x's lined up.
* The draw()s above moved everything down after the point they lined up.
*/
for((y=pt1.y==f->r.max.y?pt1.y:0),b = &f->box[n0-1]; --npts>=0; --b){
pt = pts[npts].pt1;
if(b->nrune > 0){
r.min = pt;
r.max = r.min;
r.max.x += b->wid;
r.max.y += f->font->height;
draw(f->b, r, f->b, nil, pts[npts].pt0);
/* clear bit hanging off right */
if(npts==0 && pt.y>pt0.y){
/*
* first new char is bigger than first char we're
* displacing, causing line wrap. ugly special case.
*/
r.min = opt0;
r.max = opt0;
r.max.x = f->r.max.x;
r.max.y += f->font->height;
if(f->p0<=cn0 && cn0<f->p1) /* b+1 is inside selection */
back = f->cols[HIGH];
else
back = f->cols[BACK];
draw(f->b, r, back, nil, r.min);
}else if(pt.y < y){
r.min = pt;
r.max = pt;
r.min.x += b->wid;
r.max.x = f->r.max.x;
r.max.y += f->font->height;
if(f->p0<=cn0 && cn0<f->p1) /* b+1 is inside selection */
back = f->cols[HIGH];
else
back = f->cols[BACK];
draw(f->b, r, back, nil, r.min);
}
y = pt.y;
cn0 -= b->nrune;
}else{
r.min = pt;
r.max = pt;
r.max.x += b->wid;
r.max.y += f->font->height;
if(r.max.x >= f->r.max.x)
r.max.x = f->r.max.x;
cn0--;
if(f->p0<=cn0 && cn0<f->p1) /* b is inside selection */
back = f->cols[HIGH];
else
back = f->cols[BACK];
draw(f->b, r, back, nil, r.min);
y = 0;
if(pt.x == f->r.min.x)
y = pt.y;
}
}
/* insertion can extend the selection, so the condition here is different */
if(f->p0<p0 && p0<=f->p1){
text = f->cols[HTEXT];
back = f->cols[HIGH];
}
else {
text = f->cols[TEXT];
back = f->cols[BACK];
}
frselectpaint(f, ppt0, ppt1, back);
_frdrawtext(&frame, ppt0, text, back);
_fraddbox(f, nn0, frame.nbox);
for(n=0; n<frame.nbox; n++)
f->box[nn0+n] = frame.box[n];
if(nn0>0 && f->box[nn0-1].nrune>=0 && ppt0.x-f->box[nn0-1].wid>=f->r.min.x){
--nn0;
ppt0.x -= f->box[nn0].wid;
}
n0 += frame.nbox;
_frclean(f, ppt0, nn0, n0<f->nbox-1? n0+1 : n0);
f->nchars += frame.nchars;
if(f->p0 >= p0)
f->p0 += frame.nchars;
if(f->p0 > f->nchars)
f->p0 = f->nchars;
if(f->p1 >= p0)
f->p1 += frame.nchars;
if(f->p1 > f->nchars)
f->p1 = f->nchars;
if(f->p0 == f->p1)
frtick(f, frptofchar(f, f->p0), 1);
}