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f9679f70 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | static char sccsid[] = "@(#)ex_vwind.c 7.2 (Berkeley) %G%"; | |
9 | #endif not lint | |
10 | ||
d31bedb7 MH |
11 | #include "ex.h" |
12 | #include "ex_tty.h" | |
13 | #include "ex_vis.h" | |
14 | ||
15 | /* | |
16 | * Routines to adjust the window, showing specified lines | |
17 | * in certain positions on the screen, and scrolling in both | |
18 | * directions. Code here is very dependent on mode (open versus visual). | |
19 | */ | |
20 | ||
21 | /* | |
22 | * Move in a nonlocal way to line addr. | |
23 | * If it isn't on screen put it in specified context. | |
24 | * New position for cursor is curs. | |
25 | * Like most routines here, we vsave(). | |
26 | */ | |
27 | vmoveto(addr, curs, context) | |
28 | register line *addr; | |
29 | char *curs; | |
30 | char context; | |
31 | { | |
32 | ||
33 | markit(addr); | |
34 | vsave(); | |
35 | vjumpto(addr, curs, context); | |
36 | } | |
37 | ||
38 | /* | |
39 | * Vjumpto is like vmoveto, but doesn't mark previous | |
40 | * context or save linebuf as current line. | |
41 | */ | |
42 | vjumpto(addr, curs, context) | |
43 | register line *addr; | |
44 | char *curs; | |
45 | char context; | |
46 | { | |
47 | ||
48 | noteit(0); | |
49 | if (context != 0) | |
50 | vcontext(addr, context); | |
51 | else | |
52 | vshow(addr, NOLINE); | |
53 | noteit(1); | |
54 | vnline(curs); | |
55 | } | |
56 | ||
57 | /* | |
58 | * Go up or down cnt (negative is up) to new position curs. | |
59 | */ | |
60 | vupdown(cnt, curs) | |
61 | register int cnt; | |
62 | char *curs; | |
63 | { | |
64 | ||
65 | if (cnt > 0) | |
66 | vdown(cnt, 0, 0); | |
67 | else if (cnt < 0) | |
68 | vup(-cnt, 0, 0); | |
69 | if (vcnt == 0) | |
70 | vrepaint(curs); | |
71 | else | |
72 | vnline(curs); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Go up cnt lines, afterwards preferring to be ind | |
77 | * logical lines from the top of the screen. | |
78 | * If scroll, then we MUST use a scroll. | |
79 | * Otherwise clear and redraw if motion is far. | |
80 | */ | |
81 | vup(cnt, ind, scroll) | |
82 | register int cnt, ind; | |
83 | bool scroll; | |
84 | { | |
85 | register int i, tot; | |
86 | ||
87 | if (dot == one) { | |
88 | beep(); | |
89 | return; | |
90 | } | |
91 | vsave(); | |
92 | i = lineDOT() - 1; | |
93 | if (cnt > i) { | |
94 | ind -= cnt - i; | |
95 | if (ind < 0) | |
96 | ind = 0; | |
97 | cnt = i; | |
98 | } | |
99 | if (!scroll && cnt <= vcline) { | |
100 | vshow(dot - cnt, NOLINE); | |
101 | return; | |
102 | } | |
103 | cnt -= vcline, dot -= vcline, vcline = 0; | |
104 | if (hold & HOLDWIG) | |
105 | goto contxt; | |
106 | if (state == VISUAL && !AL && !SR && | |
107 | cnt <= WTOP - ZERO && vfit(dot - cnt, cnt) <= WTOP - ZERO) | |
108 | goto okr; | |
109 | tot = WECHO - ZERO; | |
110 | if (state != VISUAL || (!AL && !SR) || (!scroll && (cnt > tot || vfit(dot - cnt, cnt) > tot / 3 + 1))) { | |
111 | if (ind > basWLINES / 2) | |
112 | ind = basWLINES / 3; | |
113 | contxt: | |
114 | vcontext(dot + ind - cnt, '.'); | |
115 | return; | |
116 | } | |
117 | okr: | |
118 | vrollR(cnt); | |
119 | if (scroll) { | |
120 | vcline += ind, dot += ind; | |
121 | if (vcline >= vcnt) | |
122 | dot -= vcline - vcnt + 1, vcline = vcnt - 1; | |
123 | getDOT(); | |
124 | } | |
125 | } | |
126 | ||
127 | /* | |
128 | * Like vup, but scrolling down. | |
129 | */ | |
130 | vdown(cnt, ind, scroll) | |
131 | register int cnt, ind; | |
132 | bool scroll; | |
133 | { | |
134 | register int i, tot; | |
135 | ||
136 | if (dot == dol) { | |
137 | beep(); | |
138 | return; | |
139 | } | |
140 | vsave(); | |
141 | i = dol - dot; | |
142 | if (cnt > i) { | |
143 | ind -= cnt - i; | |
144 | if (ind < 0) | |
145 | ind = 0; | |
146 | cnt = i; | |
147 | } | |
148 | i = vcnt - vcline - 1; | |
149 | if (!scroll && cnt <= i) { | |
150 | vshow(dot + cnt, NOLINE); | |
151 | return; | |
152 | } | |
153 | cnt -= i, dot += i, vcline += i; | |
154 | if (hold & HOLDWIG) | |
155 | goto dcontxt; | |
156 | if (!scroll) { | |
157 | tot = WECHO - ZERO; | |
158 | if (state != VISUAL || cnt - tot > 0 || vfit(dot, cnt) > tot / 3 + 1) { | |
159 | dcontxt: | |
160 | vcontext(dot + cnt, '.'); | |
161 | return; | |
162 | } | |
163 | } | |
164 | if (cnt > 0) | |
165 | vroll(cnt); | |
166 | if (state == VISUAL && scroll) { | |
167 | vcline -= ind, dot -= ind; | |
168 | if (vcline < 0) | |
169 | dot -= vcline, vcline = 0; | |
170 | getDOT(); | |
171 | } | |
172 | } | |
173 | ||
174 | /* | |
175 | * Show line addr in context where on the screen. | |
176 | * Work here is in determining new top line implied by | |
177 | * this placement of line addr, since we always draw from the top. | |
178 | */ | |
179 | vcontext(addr, where) | |
180 | register line *addr; | |
181 | char where; | |
182 | { | |
183 | register line *top; | |
184 | ||
185 | getline(*addr); | |
186 | if (state != VISUAL) | |
187 | top = addr; | |
188 | else switch (where) { | |
189 | ||
190 | case '^': | |
191 | addr = vback(addr, basWLINES - vdepth()); | |
192 | getline(*addr); | |
193 | /* fall into ... */ | |
194 | ||
195 | case '-': | |
196 | top = vback(addr, basWLINES - vdepth()); | |
197 | getline(*addr); | |
198 | break; | |
199 | ||
200 | case '.': | |
201 | top = vback(addr, basWLINES / 2 - vdepth()); | |
202 | getline(*addr); | |
203 | break; | |
204 | ||
205 | default: | |
206 | top = addr; | |
207 | break; | |
208 | } | |
209 | if (state == ONEOPEN && LINE(0) == WBOT) | |
210 | vup1(); | |
211 | vcnt = vcline = 0; | |
212 | vclean(); | |
213 | if (state == CRTOPEN) | |
214 | vup1(); | |
215 | vshow(addr, top); | |
216 | } | |
217 | ||
218 | /* | |
219 | * Get a clean line. If we are in a hard open | |
220 | * we may be able to reuse the line we are on | |
221 | * if it is blank. This is a real win. | |
222 | */ | |
223 | vclean() | |
224 | { | |
225 | ||
226 | if (state != VISUAL && state != CRTOPEN) { | |
227 | destcol = 0; | |
228 | if (!ateopr()) | |
229 | vup1(); | |
230 | vcnt = 0; | |
231 | } | |
232 | } | |
233 | ||
234 | /* | |
235 | * Show line addr with the specified top line on the screen. | |
236 | * Top may be 0; in this case have vcontext compute the top | |
237 | * (and call us recursively). Eventually, we clear the screen | |
238 | * (or its open mode equivalent) and redraw. | |
239 | */ | |
240 | vshow(addr, top) | |
241 | line *addr, *top; | |
242 | { | |
243 | #ifndef CBREAK | |
244 | register bool fried = 0; | |
245 | #endif | |
246 | register int cnt = addr - dot; | |
247 | register int i = vcline + cnt; | |
248 | short oldhold = hold; | |
249 | ||
250 | if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) { | |
251 | dot = addr; | |
252 | getDOT(); | |
253 | vcline = i; | |
254 | return; | |
255 | } | |
256 | if (state != VISUAL) { | |
257 | dot = addr; | |
258 | vopen(dot, WBOT); | |
259 | return; | |
260 | } | |
261 | if (top == 0) { | |
262 | vcontext(addr, '.'); | |
263 | return; | |
264 | } | |
265 | dot = top; | |
266 | #ifndef CBREAK | |
267 | if (vcookit(2)) | |
268 | fried++, vcook(); | |
269 | #endif | |
270 | oldhold = hold; | |
271 | hold |= HOLDAT; | |
272 | vclear(); | |
273 | vreset(0); | |
274 | vredraw(WTOP); | |
275 | /* error if vcline >= vcnt ! */ | |
276 | vcline = addr - top; | |
277 | dot = addr; | |
278 | getDOT(); | |
279 | hold = oldhold; | |
280 | vsync(LASTLINE); | |
281 | #ifndef CBREAK | |
282 | if (fried) | |
283 | flusho(), vraw(); | |
284 | #endif | |
285 | } | |
286 | ||
287 | /* | |
288 | * reset the state. | |
289 | * If inecho then leave us at the beginning of the echo | |
290 | * area; we are called this way in the middle of a :e escape | |
291 | * from visual, e.g. | |
292 | */ | |
293 | vreset(inecho) | |
294 | bool inecho; | |
295 | { | |
296 | ||
297 | vcnt = vcline = 0; | |
298 | WTOP = basWTOP; | |
299 | WLINES = basWLINES; | |
300 | if (inecho) | |
301 | splitw = 1, vgoto(WECHO, 0); | |
302 | } | |
303 | ||
304 | /* | |
305 | * Starting from which line preceding tp uses almost (but not more | |
306 | * than) cnt physical lines? | |
307 | */ | |
308 | line * | |
309 | vback(tp, cnt) | |
310 | register int cnt; | |
311 | register line *tp; | |
312 | { | |
313 | register int d; | |
314 | ||
315 | if (cnt > 0) | |
316 | for (; tp > one; tp--) { | |
317 | getline(tp[-1]); | |
318 | d = vdepth(); | |
319 | if (d > cnt) | |
320 | break; | |
321 | cnt -= d; | |
322 | } | |
323 | return (tp); | |
324 | } | |
325 | ||
326 | /* | |
327 | * How much scrolling will it take to roll cnt lines starting at tp? | |
328 | */ | |
329 | vfit(tp, cnt) | |
330 | register line *tp; | |
331 | int cnt; | |
332 | { | |
333 | register int j; | |
334 | ||
335 | j = 0; | |
336 | while (cnt > 0) { | |
337 | cnt--; | |
338 | getline(tp[cnt]); | |
339 | j += vdepth(); | |
340 | } | |
341 | if (tp > dot) | |
342 | j -= WBOT - LASTLINE; | |
343 | return (j); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Roll cnt lines onto the screen. | |
348 | */ | |
349 | vroll(cnt) | |
350 | register int cnt; | |
351 | { | |
352 | #ifndef CBREAK | |
353 | register bool fried = 0; | |
354 | #endif | |
355 | short oldhold = hold; | |
356 | ||
357 | #ifdef ADEBUG | |
358 | if (trace) | |
359 | tfixnl(), fprintf(trace, "vroll(%d)\n", cnt); | |
360 | #endif | |
361 | if (state != VISUAL) | |
362 | hold |= HOLDAT|HOLDROL; | |
363 | if (WBOT == WECHO) { | |
364 | vcnt = 0; | |
365 | if (state == ONEOPEN) | |
366 | vup1(); | |
367 | } | |
368 | #ifndef CBREAK | |
369 | if (vcookit(cnt)) | |
370 | fried++, vcook(); | |
371 | #endif | |
372 | for (; cnt > 0 && Peekkey != ATTN; cnt--) { | |
373 | dot++, vcline++; | |
374 | vopen(dot, LASTLINE); | |
375 | vscrap(); | |
376 | } | |
377 | hold = oldhold; | |
378 | if (state == HARDOPEN) | |
379 | sethard(); | |
380 | vsyncCL(); | |
381 | #ifndef CBREAK | |
382 | if (fried) | |
383 | flusho(), vraw(); | |
384 | #endif | |
385 | } | |
386 | ||
387 | /* | |
388 | * Roll backwards (scroll up). | |
389 | */ | |
390 | vrollR(cnt) | |
391 | register int cnt; | |
392 | { | |
393 | register bool fried = 0; | |
394 | short oldhold = hold; | |
395 | ||
396 | #ifdef ADEBUG | |
397 | if (trace) | |
398 | tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT()); | |
399 | #endif | |
400 | #ifndef CBREAK | |
401 | if (vcookit(cnt)) | |
402 | fried++, vcook(); | |
403 | #endif | |
404 | if (WBOT == WECHO) | |
405 | vcnt = 0; | |
406 | heldech = 0; | |
407 | hold |= HOLDAT|HOLDECH; | |
408 | for (; cnt > 0 && Peekkey != ATTN; cnt--) { | |
409 | dot--; | |
410 | vopen(dot, WTOP); | |
411 | vscrap(); | |
412 | } | |
413 | hold = oldhold; | |
414 | if (heldech) | |
415 | vclrech(0); | |
416 | vsync(LINE(vcnt-1)); | |
417 | #ifndef CBREAK | |
418 | if (fried) | |
419 | flusho(), vraw(); | |
420 | #endif | |
421 | } | |
422 | ||
423 | /* | |
424 | * Go into cooked mode (allow interrupts) during | |
425 | * a scroll if we are at less than 1200 baud and not | |
426 | * a 'vi' command, of if we are in a 'vi' command and the | |
427 | * scroll is more than 2 full screens. | |
428 | * | |
429 | * BUG: An interrupt during a scroll in this way | |
430 | * dumps to command mode. | |
431 | */ | |
432 | vcookit(cnt) | |
433 | register int cnt; | |
434 | { | |
435 | ||
436 | return (cnt > 1 && (ospeed < B1200 && !initev || cnt > LINES * 2)); | |
437 | } | |
438 | ||
439 | /* | |
440 | * Determine displayed depth of current line. | |
441 | */ | |
442 | vdepth() | |
443 | { | |
444 | register int d; | |
445 | ||
446 | d = (column(NOSTR) + WCOLS - 1 + (Putchar == listchar) + IN) / WCOLS; | |
447 | #ifdef ADEBUG | |
448 | if (trace) | |
449 | tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d); | |
450 | #endif | |
451 | return (d == 0 ? 1 : d); | |
452 | } | |
453 | ||
454 | /* | |
455 | * Move onto a new line, with cursor at position curs. | |
456 | */ | |
457 | vnline(curs) | |
458 | char *curs; | |
459 | { | |
460 | ||
461 | if (curs) | |
462 | wcursor = curs; | |
463 | else if (vmoving) | |
464 | wcursor = vfindcol(vmovcol); | |
465 | else | |
466 | wcursor = vskipwh(linebuf); | |
467 | cursor = linebuf; | |
468 | vmove(); | |
469 | } |