ref: efd1615c5741a6898853fefc24b1cbcb734e5477
dir: /appl/acme/frame.b/
implement Framem;
include "common.m";
sys : Sys;
drawm : Draw;
acme : Acme;
gui : Gui;
graph : Graph;
utils : Utils;
textm : Textm;
sprint : import sys;
Point, Rect, Font, Image, Pointer : import drawm;
draw, berror, charwidth, strwidth : import graph;
black, white : import gui;
SLOP : con 25;
noglyphs := array[4] of { 16rFFFD, 16r80, '?', ' ' };
frame : ref Frame;
init(mods : ref Dat->Mods)
{
sys = mods.sys;
drawm = mods.draw;
acme = mods.acme;
gui = mods.gui;
graph = mods.graph;
utils = mods.utils;
textm = mods.textm;
frame = newframe();
}
nullframe : Frame;
newframe() : ref Frame
{
f := ref nullframe;
f.cols = array[NCOL] of ref Draw->Image;
return f;
}
frdump(f : ref Frame)
{
utils->debug(sprint("nchars=%d\n", f.nchars));
for (i := 0; i < f.nbox; i++) {
utils->debug(sprint("box %d : ", i));
fb := f.box[i];
if (fb.nrune >= 0)
utils->debug(sprint("%d %d %s\n", fb.nrune, len fb.ptr, fb.ptr));
else
utils->debug(sprint("%d\n", fb.nrune));
}
}
# debugcheck(f : ref Frame, n : int)
# {
# if (f.nchars != xfrstrlen(f, 0)) {
# utils->debug(sprint("%d : bad frame nchars\n", n));
# frdump(f);
# berror("");
# }
# }
xfraddbox(f : ref Frame, bn : int, n : int) # add n boxes after bn, shift the rest up,
# * box[bn+n]==box[bn]
{
i : int;
if(bn > f.nbox)
berror("xfraddbox");
# bn = f.nbox has same effect as bn = f.nbox-1
if(f.nbox+n > f.nalloc)
xfrgrowbox(f, n+SLOP);
for (i=f.nbox; --i > bn; ) {
t := f.box[i+n];
f.box[i+n] = f.box[i];
f.box[i] = t;
}
if (bn < f.nbox)
*f.box[bn+n] = *f.box[bn];
f.nbox+=n;
}
xfrclosebox(f : ref Frame, n0 : int, n1 : int) # inclusive
{
i: int;
if(n0>=f.nbox || n1>=f.nbox || n1<n0)
berror("xfrclosebox");
n1++;
for(i=n1; i<f.nbox; i++) {
t := f.box[i-(n1-n0)];
f.box[i-(n1-n0)] = f.box[i];
f.box[i] = t;
}
f.nbox -= n1-n0;
}
xfrdelbox(f : ref Frame, n0 : int, n1 : int) # inclusive
{
if(n0>=f.nbox || n1>=f.nbox || n1<n0)
berror("xfrdelbox");
xfrfreebox(f, n0, n1);
xfrclosebox(f, n0, n1);
}
xfrfreebox(f : ref Frame, n0 : int, n1 : int) # inclusive
{
i : int;
if(n1<n0)
return;
if(n0>=f.nbox || n1>=f.nbox)
berror("xfrfreebox");
n1++;
for(i=n0; i<n1; i++)
if(f.box[i].nrune >= 0) {
f.box[i].nrune = 0;
f.box[i].ptr = nil;
}
}
nilfrbox : Frbox;
xfrgrowbox(f : ref Frame, delta : int)
{
ofb := f.box;
f.box = array[f.nalloc+delta] of ref Frbox;
if(f.box == nil)
berror("xfrgrowbox");
f.box[0:] = ofb[0:f.nalloc];
for (i := 0; i < delta; i++)
f.box[i+f.nalloc] = ref nilfrbox;
f.nalloc += delta;
ofb = nil;
}
dupbox(f : ref Frame, bn : int)
{
if(f.box[bn].nrune < 0)
berror("dupbox");
xfraddbox(f, bn, 1);
if(f.box[bn].nrune >= 0) {
f.box[bn+1].nrune = f.box[bn].nrune;
f.box[bn+1].ptr = f.box[bn].ptr;
}
}
truncatebox(f : ref Frame, b : ref Frbox, n : int) # drop last n chars; no allocation done
{
if(b.nrune<0 || b.nrune<n)
berror("truncatebox");
b.nrune -= n;
b.ptr = b.ptr[0:b.nrune];
b.wid = strwidth(f.font, b.ptr);
}
chopbox(f : ref Frame, b : ref Frbox, n : int) # drop first n chars; no allocation done
{
if(b.nrune<0 || b.nrune<n)
berror("chopbox");
b.nrune -= n;
b.ptr = b.ptr[n:];
b.wid = strwidth(f.font, b.ptr);
}
xfrsplitbox(f : ref Frame, bn : int, n : int)
{
dupbox(f, bn);
truncatebox(f, f.box[bn], f.box[bn].nrune-n);
chopbox(f, f.box[bn+1], n);
}
xfrmergebox(f : ref Frame, bn : int) # merge bn and bn+1
{
b0 := f.box[bn];
b1 := f.box[bn+1];
b0.ptr += b1.ptr;
b0.wid += b1.wid;
b0.nrune += b1.nrune;
xfrdelbox(f, bn+1, bn+1);
}
xfrfindbox(f : ref Frame, bn : int, p : int, q : int) : int # find box containing q and put q on a box boundary
{
nrune : int;
for( ; bn < f.nbox; bn++) {
nrune = 1;
b := f.box[bn];
# if (b.nrune >= 0 && len b.ptr != b.nrune) {
# frdump(f);
# berror(sprint("findbox %d %d %d\n", bn, p, q));
# }
if(b.nrune >= 0)
nrune = b.nrune;
if(p+nrune > q)
break;
p += nrune;
}
if(p != q)
xfrsplitbox(f, bn++, q-p);
return bn;
}
frdelete(f : ref Frame, p0 : int, p1 : int) : int
{
pt0, pt1, ppt0 : Point;
n0, n1, n, s : int;
r : Rect;
nn0 : int;
col : ref Image;
if(p0 >= f.nchars || p0 == p1 || f.b == nil)
return 0;
if(p1 > f.nchars)
p1 = f.nchars;
n0 = xfrfindbox(f, 0, 0, p0);
if(n0 == f.nbox)
berror("off end in frdelete");
n1 = xfrfindbox(f, n0, p0, p1);
pt0 = xfrptofcharnb(f, p0, n0);
pt1 = frptofchar(f, p1);
if(f.p0 == f.p1)
frtick(f, frptofchar(f, f.p0), 0);
nn0 = n0;
ppt0 = pt0;
xfrfreebox(f, n0, n1-1);
f.modified = 1;
#
# Invariants:
# pt0 points to beginning, pt1 points to end
# n0 is box containing beginning of stuff being deleted
# n1, b are box containing beginning of stuff to be kept after deletion
# cn1 is char position of n1
# f.p0 and f.p1 are not adjusted until after all deletion is done
# region between pt0 and pt1 is clear
#
cn1 := p1;
while(pt1.x!=pt0.x && n1<f.nbox){
b := f.box[n1];
pt0 = xfrcklinewrap0(f, pt0, b);
pt1 = xfrcklinewrap(f, pt1, b);
n = xfrcanfit(f, pt0, b);
if(n==0)
berror("xfrcanfit==0");
r.min = pt0;
r.max = pt0;
r.max.y += f.font.height;
if(b.nrune > 0){
if(n != b.nrune){
xfrsplitbox(f, n1, n);
b = f.box[n1];
}
r.max.x += b.wid;
draw(f.b, r, f.b, nil, pt1);
cn1 += b.nrune;
}
else{
r.max.x += xfrnewwid0(f, pt0, b);
if(r.max.x > f.r.max.x)
r.max.x = f.r.max.x;
col = f.cols[BACK];
if(f.p0<=cn1 && cn1<f.p1)
col = f.cols[HIGH];
draw(f.b, r, col, nil, pt0);
cn1++;
}
pt1 = xfradvance(f, pt1, b);
pt0.x += xfrnewwid(f, pt0, b);
*f.box[n0++] = *f.box[n1++];
}
if(n1==f.nbox && pt0.x!=pt1.x) # deleting last thing in window; must clean up
frselectpaint(f, pt0, pt1, f.cols[BACK]);
if(pt1.y != pt0.y){
pt2 : Point;
pt2 = xfrptofcharptb(f, 32767, pt1, n1);
if(pt2.y > f.r.max.y)
berror("frptofchar in frdelete");
if(n1 < f.nbox){
q0, q1, q2 : int;
q0 = pt0.y+f.font.height;
q1 = pt1.y+f.font.height;
q2 = pt2.y+f.font.height;
# rob: before was just q2 = pt1.y+f.font.height;
# q2 = pt2.y;
if(q2 > f.r.max.y)
q2 = f.r.max.y;
draw(f.b, (pt0, (pt0.x+(f.r.max.x-pt1.x), q0)),
f.b, nil, pt1);
draw(f.b, ((f.r.min.x, q0), (f.r.max.x, q0+(q2-q1))),
f.b, nil, (f.r.min.x, q1));
frselectpaint(f, (pt2.x, pt2.y-(pt1.y-pt0.y)), pt2, f.cols[BACK]);
}else
frselectpaint(f, pt0, pt2, f.cols[BACK]);
}
xfrclosebox(f, n0, n1-1);
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;
}
s = n0;
if(n0 < f.nbox-1)
s++;
xfrclean(f, ppt0, nn0, s);
if(f.p1 > p1)
f.p1 -= p1-p0;
else if(f.p1 > p0)
f.p1 = p0;
if(f.p0 > p1)
f.p0 -= p1-p0;
else if(f.p0 > p0)
f.p0 = p0;
f.nchars -= p1-p0;
if(f.p0 == f.p1)
frtick(f, frptofchar(f, f.p0), 1);
pt0 = frptofchar(f, f.nchars);
n = f.nlines;
f.nlines = (pt0.y-f.r.min.y)/f.font.height+(pt0.x>f.r.min.x);
return n - f.nlines;
}
xfrredraw(f : ref Frame, pt : Point)
{
nb : int;
for(nb = 0; nb < f.nbox; nb++) {
b := f.box[nb];
pt = xfrcklinewrap(f, pt, b);
if(b.nrune >= 0)
graph->stringx(f.b, pt, f.font, b.ptr, f.cols[TEXT]);
pt.x += b.wid;
}
}
frdrawsel(f : ref Frame, pt : Point, p0 : int, p1 : int, issel : int)
{
back, text : ref Image;
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);
}
frdrawsel0(f : ref Frame, pt : Point, p0 : int, p1 : int, back : ref Image, text : ref Image)
{
b : ref Frbox;
nb, nr, w, x, trim : int;
qt : Point;
p : int;
ptr : string;
p = 0;
trim = 0;
for(nb=0; nb<f.nbox && p<p1; nb++){
b = f.box[nb];
nr = b.nrune;
if(nr < 0)
nr = 1;
if(p+nr <= p0){
p += nr;
continue;
}
if(p >= p0){
qt = pt;
pt = xfrcklinewrap(f, pt, b);
if(pt.y > qt.y)
draw(f.b, (qt, (f.r.max.x, pt.y)), back, nil, qt);
}
ptr = b.ptr;
if(p < p0){ # beginning of region: advance into box
ptr = ptr[p0-p:];
nr -= (p0-p);
p = p0;
}
trim = 0;
if(p+nr > p1){ # end of region: trim box
nr -= (p+nr)-p1;
trim = 1;
}
if(b.nrune<0 || nr==b.nrune)
w = b.wid;
else
w = strwidth(f.font, ptr[0:nr]);
x = pt.x+w;
if(x > f.r.max.x)
x = f.r.max.x;
draw(f.b, (pt, (x, pt.y+f.font.height)), back, nil, pt);
if(b.nrune >= 0)
graph->stringx(f.b, pt, f.font, ptr[0:nr], text);
pt.x += w;
p += nr;
}
# if this is end of last plain text box on wrapped line, fill to end of line
if(p1>p0 && nb>0 && nb<f.nbox && f.box[nb-1].nrune>0 && !trim){
qt = pt;
pt = xfrcklinewrap(f, pt, f.box[nb]);
if(pt.y > qt.y)
draw(f.b, (qt, (f.r.max.x, pt.y)), back, nil, qt);
}
}
frtick(f : ref Frame, pt : Point, ticked : int)
{
r : Rect;
if(f.ticked==ticked || f.tick==nil || !pt.in(f.r))
return;
pt.x--; # looks best just left of where requested
r = (pt, (pt.x+FRTICKW, pt.y+f.font.height));
if(ticked){
draw(f.tickback, f.tickback.r, f.b, nil, pt);
draw(f.b, r, f.tick, nil, (0, 0));
}else
draw(f.b, r, f.tickback, nil, (0, 0));
f.ticked = ticked;
}
xfrdraw(f : ref Frame, pt : Point) : Point
{
nb, n : int;
for(nb=0; nb < f.nbox; nb++){
b := f.box[nb];
pt = xfrcklinewrap0(f, pt, b);
if(pt.y == f.r.max.y){
f.nchars -= xfrstrlen(f, nb);
xfrdelbox(f, nb, f.nbox-1);
break;
}
if(b.nrune > 0){
n = xfrcanfit(f, pt, b);
if(n == 0)
berror("draw: xfrcanfit==0");
if(n != b.nrune){
xfrsplitbox(f, nb, n);
b = f.box[nb];
}
pt.x += b.wid;
}else{
if(b.bc == '\n') {
pt.x = f.r.min.x;
pt.y += f.font.height;
}
else
pt.x += xfrnewwid(f, pt, b);
}
}
return pt;
}
xfrstrlen(f : ref Frame, nb : int) : int
{
n, nrune : int;
for(n=0; nb<f.nbox; nb++) {
nrune = f.box[nb].nrune;
if(nrune < 0)
nrune = 1;
n += nrune;
}
return n;
}
frinit(f : ref Frame, r : Rect, ft : ref Font, b : ref Image, cols : array of ref Draw->Image)
{
f.font = ft;
f.scroll = 0;
f.maxtab = 8*charwidth(ft, '0');
f.nbox = 0;
f.nalloc = 0;
f.nchars = 0;
f.nlines = 0;
f.p0 = 0;
f.p1 = 0;
f.box = nil;
f.lastlinefull = 0;
if(cols != nil)
for(i := 0; i < NCOL; i++)
f.cols[i] = cols[i];
for (i = 0; i < len noglyphs; i++) {
if (charwidth(ft, noglyphs[i]) != 0) {
f.noglyph = noglyphs[i];
break;
}
}
frsetrects(f, r, b);
if (f.tick==nil && f.cols[BACK] != nil)
frinittick(f);
}
frinittick(f : ref Frame)
{
ft : ref Font;
ft = f.font;
f.tick = nil;
f.tick = graph->balloc(((0, 0), (FRTICKW, ft.height)), (gui->mainwin).chans, Draw->White);
if(f.tick == nil)
return;
f.tickback = graph->balloc(f.tick.r, (gui->mainwin).chans, Draw->White);
if(f.tickback == nil){
f.tick = nil;
return;
}
# background color
draw(f.tick, f.tick.r, f.cols[BACK], nil, (0, 0));
# vertical line
draw(f.tick, ((FRTICKW/2, 0), (FRTICKW/2+1, ft.height)), black, nil, (0, 0));
# box on each end
# draw(f->tick, Rect(0, 0, FRTICKW, FRTICKW), f->cols[TEXT], nil, ZP);
# draw(f->tick, Rect(0, ft->height-FRTICKW, FRTICKW, ft->height), f->cols[TEXT], nil, ZP);
}
frsetrects(f : ref Frame, r : Rect, b : ref Image)
{
f.b = b;
f.entire = r;
f.r = r;
f.r.max.y -= (r.max.y-r.min.y)%f.font.height;
f.maxlines = (r.max.y-r.min.y)/f.font.height;
}
frclear(f : ref Frame, freeall : int)
{
if(f.nbox)
xfrdelbox(f, 0, f.nbox-1);
for (i := 0; i < f.nalloc; i++)
f.box[i] = nil;
if(freeall)
f.tick = f.tickback = nil;
f.box = nil;
f.ticked = 0;
}
DELTA : con 25;
TMPSIZE : con 256;
Plist : adt {
pt0 : Point;
pt1 : Point;
};
nalloc : int = 0;
pts : array of Plist;
bxscan(f : ref Frame, rp : string, l : int, ppt : Point) : (Point, Point)
{
w, c, nb, delta, nl, nr : int;
sp : int = 0;
frame.r = f.r;
frame.b = f.b;
frame.font = f.font;
frame.maxtab = f.maxtab;
frame.nbox = 0;
frame.nchars = 0;
for(i := 0; i < NCOL; i++)
frame.cols[i] = f.cols[i];
frame.noglyph = f.noglyph;
delta = DELTA;
nl = 0;
for(nb=0; sp<l && nl <= f.maxlines; nb++){
if(nb == frame.nalloc){
xfrgrowbox(frame, delta);
if(delta < 10000)
delta *= 2;
}
b := frame.box[nb];
c = rp[sp];
if(c=='\t' || c=='\n'){
b.bc = c;
b.wid = 5000;
if(c == '\n')
b.minwid = 0;
else
b.minwid = charwidth(frame.font, ' ');
b.nrune = -1;
if(c=='\n')
nl++;
frame.nchars++;
sp++;
}else{
nr = 0;
w = 0;
ssp := sp;
nul := 0;
while(sp < l){
c = rp[sp];
if(c=='\t' || c=='\n')
break;
if(nr+1 >= TMPSIZE)
break;
if ((cw := charwidth(frame.font, c)) == 0) { # used to be only for c == 0
c = frame.noglyph;
cw = charwidth(frame.font, c);
nul = 1;
}
w += cw;
sp++;
nr++;
}
b = frame.box[nb];
b.ptr = rp[ssp:sp];
b.wid = w;
b.nrune = nr;
frame.nchars += nr;
if (nul) {
for (i = 0; i < nr; i++)
if (charwidth(frame.font, b.ptr[i]) == 0)
b.ptr[i] = frame.noglyph;
}
}
frame.nbox++;
}
ppt = xfrcklinewrap0(f, ppt, frame.box[0]);
return (xfrdraw(frame, ppt), ppt);
}
chopframe(f : ref Frame, pt : Point, p : int, bn : int)
{
nb, nrune : int;
for(nb = bn; ; nb++){
if(nb >= f.nbox)
berror("endofframe");
b := f.box[nb];
pt = xfrcklinewrap(f, pt, b);
if(pt.y >= f.r.max.y)
break;
nrune = b.nrune;
if(nrune < 0)
nrune = 1;
p += nrune;
pt = xfradvance(f, pt, b);
}
f.nchars = p;
f.nlines = f.maxlines;
if (nb < f.nbox) # BUG
xfrdelbox(f, nb, f.nbox-1);
}
frinsert(f : ref Frame, rp : string, l : int, p0 : int)
{
pt0, pt1, ppt0, ppt1, pt : Point;
s, n, n0, nn0, y : int;
r : Rect;
npts : int;
col : ref Image;
if(p0 > f.nchars || l == 0 || f.b == nil)
return;
n0 = xfrfindbox(f, 0, 0, p0);
cn0 := p0;
nn0 = n0;
pt0 = xfrptofcharnb(f, p0, n0);
ppt0 = pt0;
(pt1, ppt0) = bxscan(f, rp, l, ppt0);
ppt1 = pt1;
if(n0 < f.nbox){
b := f.box[n0];
pt0 = xfrcklinewrap(f, pt0, b); # for frdrawsel()
ppt1 = xfrcklinewrap0(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 then insertion
# If pt1 goes off the rectangle, we can toss everything from there on
#
for(npts=0; pt1.x!= pt0.x && pt1.y!=f.r.max.y && n0<f.nbox; npts++){
b := f.box[n0];
pt0 = xfrcklinewrap(f, pt0, b);
pt1 = xfrcklinewrap0(f, pt1, b);
if(b.nrune > 0){
n = xfrcanfit(f, pt1, b);
if(n == 0)
berror("xfrcanfit==0");
if(n != b.nrune){
xfrsplitbox(f, n0, n);
b = f.box[n0];
}
}
if(npts == nalloc){
opts := pts;
pts = array[npts+DELTA] of Plist;
pts[0:] = opts[0:npts];
for (k := 0; k < DELTA; k++)
pts[k+npts].pt0 = pts[k+npts].pt1 = (0, 0);
opts = nil;
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;
pt0 = xfradvance(f, pt0, b);
pt1.x += xfrnewwid(f, pt1, b);
n0++;
nrune := b.nrune;
if(nrune < 0)
nrune = 1;
cn0 += nrune;
}
if(pt1.y > f.r.max.y)
berror("frinsert pt1 too far");
if(pt1.y==f.r.max.y && n0<f.nbox){
f.nchars -= xfrstrlen(f, n0);
xfrdelbox(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){
q0, q1 : int;
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, (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 draws above moved everything down after the point they lined up.
#
y = 0;
if(pt1.y == f.r.max.y)
y = pt1.y;
for(j := n0-1; --npts >= 0; --j){
pt = pts[npts].pt1;
b := f.box[j];
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);
if(pt.y < y){ # clear bit hanging off right
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
col = f.cols[HIGH];
else
col = f.cols[BACK];
draw(f.b, r, col, 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
col = f.cols[HIGH];
else
col = f.cols[BACK];
draw(f.b, r, col, 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)
col = f.cols[HIGH];
else
col = f.cols[BACK];
frselectpaint(f, ppt0, ppt1, col);
xfrredraw(frame, ppt0);
xfraddbox(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;
s = n0;
if(n0 < f.nbox-1)
s++;
xfrclean(f, ppt0, nn0, s);
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);
}
xfrptofcharptb(f : ref Frame, p : int, pt : Point, bn : int) : Point
{
s : int;
l : int;
r : int;
for( ; bn < f.nbox; bn++){
b := f.box[bn];
pt = xfrcklinewrap(f, pt, b);
l = b.nrune;
if(l < 0)
l = 1;
if(p < l){
if(b.nrune > 0)
for(s = 0; p > 0; s++){
r = b.ptr[s];
pt.x += charwidth(f.font, r);
if(r==0 || pt.x>f.r.max.x)
berror("frptofchar");
p--;
}
break;
}
p -= l;
pt = xfradvance(f, pt, b);
}
return pt;
}
frptofchar(f : ref Frame, p : int) : Point
{
return xfrptofcharptb(f, p, f.r.min, 0);
}
xfrptofcharnb(f : ref Frame, p : int, nb : int) : Point # doesn't do final xfradvance to next line
{
pt : Point;
nbox : int;
nbox = f.nbox;
f.nbox = nb;
pt = xfrptofcharptb(f, p, f.r.min, 0);
f.nbox = nbox;
return pt;
}
xfrgrid(f : ref Frame, p: Point) : Point
{
p.y -= f.r.min.y;
p.y -= p.y%f.font.height;
p.y += f.r.min.y;
if(p.x > f.r.max.x)
p.x = f.r.max.x;
return p;
}
frcharofpt(f : ref Frame, pt : Point) : int
{
qt : Point;
bn, nrune : int;
s : int;
p : int;
r : int;
pt = xfrgrid(f, pt);
qt = f.r.min;
bn=0;
for(p=0; bn<f.nbox && qt.y<pt.y; bn++){
b := f.box[bn];
qt = xfrcklinewrap(f, qt, b);
if(qt.y >= pt.y)
break;
qt = xfradvance(f, qt, b);
nrune = b.nrune;
if(nrune < 0)
nrune = 1;
p += nrune;
}
for(; bn<f.nbox && qt.x<=pt.x; bn++){
b := f.box[bn];
qt = xfrcklinewrap(f, qt, b);
if(qt.y > pt.y)
break;
if(qt.x+b.wid > pt.x){
if(b.nrune < 0)
qt = xfradvance(f, qt, b);
else{
s = 0;
for(;;){
r = b.ptr[s++];
qt.x += charwidth(f.font, r);
if(qt.x > pt.x)
break;
p++;
}
}
}else{
nrune = b.nrune;
if(nrune < 0)
nrune = 1;
p += nrune;
qt = xfradvance(f, qt, b);
}
}
return p;
}
region(a, b : int) : int
{
if(a < b)
return -1;
if(a == b)
return 0;
return 1;
}
frselect(f : ref Frame, m : ref Pointer) # when called, button 1 is down
{
p0, p1, q : int;
mp, pt0, pt1, qt : Point;
b, scrled, reg : int;
mp = m.xy;
b = 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);
do{
scrled = 0;
if(f.scroll){
if(m.xy.y < f.r.min.y){
textm->framescroll(f, -(f.r.min.y-m.xy.y)/f.font.height-1);
p0 = f.p1;
p1 = f.p0;
scrled = 1;
}else if(m.xy.y > f.r.max.y){
textm->framescroll(f, (m.xy.y-f.r.max.y)/f.font.height+1);
p0 = f.p0;
p1 = f.p1;
scrled = 1;
}
if(scrled){
pt0 = frptofchar(f, p0);
pt1 = frptofchar(f, p1);
reg = region(p1, p0);
}
}
q = frcharofpt(f, m.xy);
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)
textm->framescroll(f, 0);
graph->bflush();
if(!scrled)
acme->frgetmouse();
}while(m.buttons == b);
}
frselectpaint(f : ref Frame, p0 : Point, p1 : Point, col : ref Image)
{
n : int;
q0, q1 : Point;
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)
berror("frselectpaint b==0");
if(p0.y == f.r.max.y)
return;
if(n == 0)
draw(f.b, (p0, q1), col, nil, (0, 0));
else{
if(p0.x >= f.r.max.x)
p0.x = f.r.max.x-1;
draw(f.b, ((p0.x, p0.y), (f.r.max.x, q0.y)), col, nil, (0, 0));
if(n > 1)
draw(f.b, ((f.r.min.x, q0.y), (f.r.max.x, p1.y)),
col, nil, (0, 0));
draw(f.b, ((f.r.min.x, p1.y), (q1.x, q1.y)),
col, nil, (0, 0));
}
}
xfrcanfit(f : ref Frame, pt : Point, b : ref Frbox) : int
{
left, nr : int;
p : int;
r : int;
left = f.r.max.x-pt.x;
if(b.nrune < 0)
return b.minwid <= left;
if(left >= b.wid)
return b.nrune;
nr = 0;
for(p = 0; p < len b.ptr; p++){
r = b.ptr[p];
left -= charwidth(f.font, r);
if(left < 0)
return nr;
nr++;
}
berror("xfrcanfit can't");
return 0;
}
xfrcklinewrap(f : ref Frame, p : Point, b : ref Frbox) : Point
{
wid : int;
if(b.nrune < 0)
wid = b.minwid;
else
wid = b.wid;
if(wid > f.r.max.x-p.x){
p.x = f.r.min.x;
p.y += f.font.height;
}
return p;
}
xfrcklinewrap0(f : ref Frame, p : Point, b : ref Frbox) : Point
{
if(xfrcanfit(f, p, b) == 0){
p.x = f.r.min.x;
p.y += f.font.height;
}
return p;
}
xfrcklinewrap1(f : ref Frame, p : Point, wid : int) : Point
{
if(wid > f.r.max.x-p.x){
p.x = f.r.min.x;
p.y += f.font.height;
}
return p;
}
xfradvance(f : ref Frame, p : Point, b : ref Frbox) : Point
{
if(b.nrune<0 && b.bc=='\n'){
p.x = f.r.min.x;
p.y += f.font.height;
}else
p.x += b.wid;
return p;
}
xfrnewwid(f : ref Frame, pt : Point, b : ref Frbox) : int
{
b.wid = xfrnewwid0(f, pt, b);
return b.wid;
}
xfrnewwid0(f : ref Frame, pt : Point, b : ref Frbox) : int
{
c, x : int;
c = f.r.max.x;
x = pt.x;
if(b.nrune >= 0 || b.bc != '\t')
return b.wid;
if(x+b.minwid > c)
x = pt.x = f.r.min.x;
x += f.maxtab;
x -= (x-f.r.min.x)%f.maxtab;
if(x-pt.x<b.minwid || x>c)
x = pt.x+b.minwid;
return x-pt.x;
}
xfrclean(f : ref Frame, pt : Point, n0 : int, n1 : int) # look for mergeable boxes
{
nb, c : int;
c = f.r.max.x;
for(nb=n0; nb<n1-1; nb++){
b0 := f.box[nb];
b1 := f.box[nb+1];
pt = xfrcklinewrap(f, pt, b0);
while(b0.nrune>=0 && nb<n1-1 && b1.nrune>=0 && pt.x+b0.wid+b1.wid<c){
xfrmergebox(f, nb);
n1--;
b0 = f.box[nb];
b1 = f.box[nb+1];
}
pt = xfradvance(f, pt, f.box[nb]);
}
for(; nb<f.nbox; nb++){
b := f.box[nb];
pt = xfrcklinewrap(f, pt, b);
pt = xfradvance(f, pt, f.box[nb]);
}
f.lastlinefull = 0;
if(pt.y >= f.r.max.y)
f.lastlinefull = 1;
}