Commit | Line | Data |
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299f2784 MH |
1 | /* Copyright (c) 1981 Regents of the University of California */ |
2 | static char *sccsid = "@(#)ex_vwind.c 7.1 %G%"; | |
d31bedb7 MH |
3 | #include "ex.h" |
4 | #include "ex_tty.h" | |
5 | #include "ex_vis.h" | |
6 | ||
7 | /* | |
8 | * Routines to adjust the window, showing specified lines | |
9 | * in certain positions on the screen, and scrolling in both | |
10 | * directions. Code here is very dependent on mode (open versus visual). | |
11 | */ | |
12 | ||
13 | /* | |
14 | * Move in a nonlocal way to line addr. | |
15 | * If it isn't on screen put it in specified context. | |
16 | * New position for cursor is curs. | |
17 | * Like most routines here, we vsave(). | |
18 | */ | |
19 | vmoveto(addr, curs, context) | |
20 | register line *addr; | |
21 | char *curs; | |
22 | char context; | |
23 | { | |
24 | ||
25 | markit(addr); | |
26 | vsave(); | |
27 | vjumpto(addr, curs, context); | |
28 | } | |
29 | ||
30 | /* | |
31 | * Vjumpto is like vmoveto, but doesn't mark previous | |
32 | * context or save linebuf as current line. | |
33 | */ | |
34 | vjumpto(addr, curs, context) | |
35 | register line *addr; | |
36 | char *curs; | |
37 | char context; | |
38 | { | |
39 | ||
40 | noteit(0); | |
41 | if (context != 0) | |
42 | vcontext(addr, context); | |
43 | else | |
44 | vshow(addr, NOLINE); | |
45 | noteit(1); | |
46 | vnline(curs); | |
47 | } | |
48 | ||
49 | /* | |
50 | * Go up or down cnt (negative is up) to new position curs. | |
51 | */ | |
52 | vupdown(cnt, curs) | |
53 | register int cnt; | |
54 | char *curs; | |
55 | { | |
56 | ||
57 | if (cnt > 0) | |
58 | vdown(cnt, 0, 0); | |
59 | else if (cnt < 0) | |
60 | vup(-cnt, 0, 0); | |
61 | if (vcnt == 0) | |
62 | vrepaint(curs); | |
63 | else | |
64 | vnline(curs); | |
65 | } | |
66 | ||
67 | /* | |
68 | * Go up cnt lines, afterwards preferring to be ind | |
69 | * logical lines from the top of the screen. | |
70 | * If scroll, then we MUST use a scroll. | |
71 | * Otherwise clear and redraw if motion is far. | |
72 | */ | |
73 | vup(cnt, ind, scroll) | |
74 | register int cnt, ind; | |
75 | bool scroll; | |
76 | { | |
77 | register int i, tot; | |
78 | ||
79 | if (dot == one) { | |
80 | beep(); | |
81 | return; | |
82 | } | |
83 | vsave(); | |
84 | i = lineDOT() - 1; | |
85 | if (cnt > i) { | |
86 | ind -= cnt - i; | |
87 | if (ind < 0) | |
88 | ind = 0; | |
89 | cnt = i; | |
90 | } | |
91 | if (!scroll && cnt <= vcline) { | |
92 | vshow(dot - cnt, NOLINE); | |
93 | return; | |
94 | } | |
95 | cnt -= vcline, dot -= vcline, vcline = 0; | |
96 | if (hold & HOLDWIG) | |
97 | goto contxt; | |
98 | if (state == VISUAL && !AL && !SR && | |
99 | cnt <= WTOP - ZERO && vfit(dot - cnt, cnt) <= WTOP - ZERO) | |
100 | goto okr; | |
101 | tot = WECHO - ZERO; | |
102 | if (state != VISUAL || (!AL && !SR) || (!scroll && (cnt > tot || vfit(dot - cnt, cnt) > tot / 3 + 1))) { | |
103 | if (ind > basWLINES / 2) | |
104 | ind = basWLINES / 3; | |
105 | contxt: | |
106 | vcontext(dot + ind - cnt, '.'); | |
107 | return; | |
108 | } | |
109 | okr: | |
110 | vrollR(cnt); | |
111 | if (scroll) { | |
112 | vcline += ind, dot += ind; | |
113 | if (vcline >= vcnt) | |
114 | dot -= vcline - vcnt + 1, vcline = vcnt - 1; | |
115 | getDOT(); | |
116 | } | |
117 | } | |
118 | ||
119 | /* | |
120 | * Like vup, but scrolling down. | |
121 | */ | |
122 | vdown(cnt, ind, scroll) | |
123 | register int cnt, ind; | |
124 | bool scroll; | |
125 | { | |
126 | register int i, tot; | |
127 | ||
128 | if (dot == dol) { | |
129 | beep(); | |
130 | return; | |
131 | } | |
132 | vsave(); | |
133 | i = dol - dot; | |
134 | if (cnt > i) { | |
135 | ind -= cnt - i; | |
136 | if (ind < 0) | |
137 | ind = 0; | |
138 | cnt = i; | |
139 | } | |
140 | i = vcnt - vcline - 1; | |
141 | if (!scroll && cnt <= i) { | |
142 | vshow(dot + cnt, NOLINE); | |
143 | return; | |
144 | } | |
145 | cnt -= i, dot += i, vcline += i; | |
146 | if (hold & HOLDWIG) | |
147 | goto dcontxt; | |
148 | if (!scroll) { | |
149 | tot = WECHO - ZERO; | |
150 | if (state != VISUAL || cnt - tot > 0 || vfit(dot, cnt) > tot / 3 + 1) { | |
151 | dcontxt: | |
152 | vcontext(dot + cnt, '.'); | |
153 | return; | |
154 | } | |
155 | } | |
156 | if (cnt > 0) | |
157 | vroll(cnt); | |
158 | if (state == VISUAL && scroll) { | |
159 | vcline -= ind, dot -= ind; | |
160 | if (vcline < 0) | |
161 | dot -= vcline, vcline = 0; | |
162 | getDOT(); | |
163 | } | |
164 | } | |
165 | ||
166 | /* | |
167 | * Show line addr in context where on the screen. | |
168 | * Work here is in determining new top line implied by | |
169 | * this placement of line addr, since we always draw from the top. | |
170 | */ | |
171 | vcontext(addr, where) | |
172 | register line *addr; | |
173 | char where; | |
174 | { | |
175 | register line *top; | |
176 | ||
177 | getline(*addr); | |
178 | if (state != VISUAL) | |
179 | top = addr; | |
180 | else switch (where) { | |
181 | ||
182 | case '^': | |
183 | addr = vback(addr, basWLINES - vdepth()); | |
184 | getline(*addr); | |
185 | /* fall into ... */ | |
186 | ||
187 | case '-': | |
188 | top = vback(addr, basWLINES - vdepth()); | |
189 | getline(*addr); | |
190 | break; | |
191 | ||
192 | case '.': | |
193 | top = vback(addr, basWLINES / 2 - vdepth()); | |
194 | getline(*addr); | |
195 | break; | |
196 | ||
197 | default: | |
198 | top = addr; | |
199 | break; | |
200 | } | |
201 | if (state == ONEOPEN && LINE(0) == WBOT) | |
202 | vup1(); | |
203 | vcnt = vcline = 0; | |
204 | vclean(); | |
205 | if (state == CRTOPEN) | |
206 | vup1(); | |
207 | vshow(addr, top); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Get a clean line. If we are in a hard open | |
212 | * we may be able to reuse the line we are on | |
213 | * if it is blank. This is a real win. | |
214 | */ | |
215 | vclean() | |
216 | { | |
217 | ||
218 | if (state != VISUAL && state != CRTOPEN) { | |
219 | destcol = 0; | |
220 | if (!ateopr()) | |
221 | vup1(); | |
222 | vcnt = 0; | |
223 | } | |
224 | } | |
225 | ||
226 | /* | |
227 | * Show line addr with the specified top line on the screen. | |
228 | * Top may be 0; in this case have vcontext compute the top | |
229 | * (and call us recursively). Eventually, we clear the screen | |
230 | * (or its open mode equivalent) and redraw. | |
231 | */ | |
232 | vshow(addr, top) | |
233 | line *addr, *top; | |
234 | { | |
235 | #ifndef CBREAK | |
236 | register bool fried = 0; | |
237 | #endif | |
238 | register int cnt = addr - dot; | |
239 | register int i = vcline + cnt; | |
240 | short oldhold = hold; | |
241 | ||
242 | if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) { | |
243 | dot = addr; | |
244 | getDOT(); | |
245 | vcline = i; | |
246 | return; | |
247 | } | |
248 | if (state != VISUAL) { | |
249 | dot = addr; | |
250 | vopen(dot, WBOT); | |
251 | return; | |
252 | } | |
253 | if (top == 0) { | |
254 | vcontext(addr, '.'); | |
255 | return; | |
256 | } | |
257 | dot = top; | |
258 | #ifndef CBREAK | |
259 | if (vcookit(2)) | |
260 | fried++, vcook(); | |
261 | #endif | |
262 | oldhold = hold; | |
263 | hold |= HOLDAT; | |
264 | vclear(); | |
265 | vreset(0); | |
266 | vredraw(WTOP); | |
267 | /* error if vcline >= vcnt ! */ | |
268 | vcline = addr - top; | |
269 | dot = addr; | |
270 | getDOT(); | |
271 | hold = oldhold; | |
272 | vsync(LASTLINE); | |
273 | #ifndef CBREAK | |
274 | if (fried) | |
275 | flusho(), vraw(); | |
276 | #endif | |
277 | } | |
278 | ||
279 | /* | |
280 | * reset the state. | |
281 | * If inecho then leave us at the beginning of the echo | |
282 | * area; we are called this way in the middle of a :e escape | |
283 | * from visual, e.g. | |
284 | */ | |
285 | vreset(inecho) | |
286 | bool inecho; | |
287 | { | |
288 | ||
289 | vcnt = vcline = 0; | |
290 | WTOP = basWTOP; | |
291 | WLINES = basWLINES; | |
292 | if (inecho) | |
293 | splitw = 1, vgoto(WECHO, 0); | |
294 | } | |
295 | ||
296 | /* | |
297 | * Starting from which line preceding tp uses almost (but not more | |
298 | * than) cnt physical lines? | |
299 | */ | |
300 | line * | |
301 | vback(tp, cnt) | |
302 | register int cnt; | |
303 | register line *tp; | |
304 | { | |
305 | register int d; | |
306 | ||
307 | if (cnt > 0) | |
308 | for (; tp > one; tp--) { | |
309 | getline(tp[-1]); | |
310 | d = vdepth(); | |
311 | if (d > cnt) | |
312 | break; | |
313 | cnt -= d; | |
314 | } | |
315 | return (tp); | |
316 | } | |
317 | ||
318 | /* | |
319 | * How much scrolling will it take to roll cnt lines starting at tp? | |
320 | */ | |
321 | vfit(tp, cnt) | |
322 | register line *tp; | |
323 | int cnt; | |
324 | { | |
325 | register int j; | |
326 | ||
327 | j = 0; | |
328 | while (cnt > 0) { | |
329 | cnt--; | |
330 | getline(tp[cnt]); | |
331 | j += vdepth(); | |
332 | } | |
333 | if (tp > dot) | |
334 | j -= WBOT - LASTLINE; | |
335 | return (j); | |
336 | } | |
337 | ||
338 | /* | |
339 | * Roll cnt lines onto the screen. | |
340 | */ | |
341 | vroll(cnt) | |
342 | register int cnt; | |
343 | { | |
344 | #ifndef CBREAK | |
345 | register bool fried = 0; | |
346 | #endif | |
347 | short oldhold = hold; | |
348 | ||
349 | #ifdef ADEBUG | |
350 | if (trace) | |
351 | tfixnl(), fprintf(trace, "vroll(%d)\n", cnt); | |
352 | #endif | |
353 | if (state != VISUAL) | |
354 | hold |= HOLDAT|HOLDROL; | |
355 | if (WBOT == WECHO) { | |
356 | vcnt = 0; | |
357 | if (state == ONEOPEN) | |
358 | vup1(); | |
359 | } | |
360 | #ifndef CBREAK | |
361 | if (vcookit(cnt)) | |
362 | fried++, vcook(); | |
363 | #endif | |
364 | for (; cnt > 0 && Peekkey != ATTN; cnt--) { | |
365 | dot++, vcline++; | |
366 | vopen(dot, LASTLINE); | |
367 | vscrap(); | |
368 | } | |
369 | hold = oldhold; | |
370 | if (state == HARDOPEN) | |
371 | sethard(); | |
372 | vsyncCL(); | |
373 | #ifndef CBREAK | |
374 | if (fried) | |
375 | flusho(), vraw(); | |
376 | #endif | |
377 | } | |
378 | ||
379 | /* | |
380 | * Roll backwards (scroll up). | |
381 | */ | |
382 | vrollR(cnt) | |
383 | register int cnt; | |
384 | { | |
385 | register bool fried = 0; | |
386 | short oldhold = hold; | |
387 | ||
388 | #ifdef ADEBUG | |
389 | if (trace) | |
390 | tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT()); | |
391 | #endif | |
392 | #ifndef CBREAK | |
393 | if (vcookit(cnt)) | |
394 | fried++, vcook(); | |
395 | #endif | |
396 | if (WBOT == WECHO) | |
397 | vcnt = 0; | |
398 | heldech = 0; | |
399 | hold |= HOLDAT|HOLDECH; | |
400 | for (; cnt > 0 && Peekkey != ATTN; cnt--) { | |
401 | dot--; | |
402 | vopen(dot, WTOP); | |
403 | vscrap(); | |
404 | } | |
405 | hold = oldhold; | |
406 | if (heldech) | |
407 | vclrech(0); | |
408 | vsync(LINE(vcnt-1)); | |
409 | #ifndef CBREAK | |
410 | if (fried) | |
411 | flusho(), vraw(); | |
412 | #endif | |
413 | } | |
414 | ||
415 | /* | |
416 | * Go into cooked mode (allow interrupts) during | |
417 | * a scroll if we are at less than 1200 baud and not | |
418 | * a 'vi' command, of if we are in a 'vi' command and the | |
419 | * scroll is more than 2 full screens. | |
420 | * | |
421 | * BUG: An interrupt during a scroll in this way | |
422 | * dumps to command mode. | |
423 | */ | |
424 | vcookit(cnt) | |
425 | register int cnt; | |
426 | { | |
427 | ||
428 | return (cnt > 1 && (ospeed < B1200 && !initev || cnt > LINES * 2)); | |
429 | } | |
430 | ||
431 | /* | |
432 | * Determine displayed depth of current line. | |
433 | */ | |
434 | vdepth() | |
435 | { | |
436 | register int d; | |
437 | ||
438 | d = (column(NOSTR) + WCOLS - 1 + (Putchar == listchar) + IN) / WCOLS; | |
439 | #ifdef ADEBUG | |
440 | if (trace) | |
441 | tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d); | |
442 | #endif | |
443 | return (d == 0 ? 1 : d); | |
444 | } | |
445 | ||
446 | /* | |
447 | * Move onto a new line, with cursor at position curs. | |
448 | */ | |
449 | vnline(curs) | |
450 | char *curs; | |
451 | { | |
452 | ||
453 | if (curs) | |
454 | wcursor = curs; | |
455 | else if (vmoving) | |
456 | wcursor = vfindcol(vmovcol); | |
457 | else | |
458 | wcursor = vskipwh(linebuf); | |
459 | cursor = linebuf; | |
460 | vmove(); | |
461 | } |