1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
|
#include <u.h>
#include <libc.h>
#include <draw.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;
for(b = &f->box[bn]; ; b++){
if(b >= &f->box[f->nbox])
drawerror(f->display, "endofframe");
_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<&f->box[f->nbox]) /* 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 *col;
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 */
col = f->cols[HIGH];
else
col = f->cols[BACK];
draw(f->b, r, col, 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 */
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);
_frredraw(&frame, ppt0);
_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);
}
|