Annotation of src/usr.bin/tmux/screen.c, Revision 1.14
1.14 ! nicm 1: /* $OpenBSD: screen.c,v 1.13 2010/01/03 17:12:04 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20:
1.3 nicm 21: #include <stdlib.h>
1.1 nicm 22: #include <string.h>
1.2 nicm 23: #include <vis.h>
1.1 nicm 24:
25: #include "tmux.h"
26:
27: void screen_resize_x(struct screen *, u_int);
28: void screen_resize_y(struct screen *, u_int);
29:
30: /* Create a new screen. */
31: void
32: screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
33: {
34: s->grid = grid_create(sx, sy, hlimit);
35:
36: s->title = xstrdup("");
37:
1.3 nicm 38: s->tabs = NULL;
39:
1.1 nicm 40: screen_reinit(s);
41: }
42:
43: /* Reinitialise screen. */
44: void
45: screen_reinit(struct screen *s)
46: {
47: s->cx = 0;
48: s->cy = 0;
49:
50: s->rupper = 0;
51: s->rlower = screen_size_y(s) - 1;
52:
53: s->mode = MODE_CURSOR;
1.12 nicm 54:
1.3 nicm 55: screen_reset_tabs(s);
1.1 nicm 56:
1.6 nicm 57: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy);
1.1 nicm 58:
59: screen_clear_selection(s);
60: }
61:
62: /* Destroy a screen. */
63: void
64: screen_free(struct screen *s)
65: {
1.10 nicm 66: if (s->tabs != NULL)
67: xfree(s->tabs);
1.1 nicm 68: xfree(s->title);
69: grid_destroy(s->grid);
70: }
71:
1.3 nicm 72: /* Reset tabs to default, eight spaces apart. */
73: void
74: screen_reset_tabs(struct screen *s)
75: {
76: u_int i;
77:
78: if (s->tabs != NULL)
79: xfree(s->tabs);
80:
81: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
82: fatal("bit_alloc failed");
83: for (i = 8; i < screen_size_x(s); i += 8)
84: bit_set(s->tabs, i);
85: }
86:
1.1 nicm 87: /* Set screen title. */
88: void
89: screen_set_title(struct screen *s, const char *title)
90: {
1.2 nicm 91: char tmp[BUFSIZ];
92:
93: strnvis(tmp, title, sizeof tmp, VIS_OCTAL|VIS_TAB|VIS_NL);
94:
1.1 nicm 95: xfree(s->title);
1.2 nicm 96: s->title = xstrdup(tmp);
1.1 nicm 97: }
98:
99: /* Resize screen. */
100: void
101: screen_resize(struct screen *s, u_int sx, u_int sy)
102: {
103: if (sx < 1)
104: sx = 1;
105: if (sy < 1)
106: sy = 1;
107:
1.3 nicm 108: if (sx != screen_size_x(s)) {
1.1 nicm 109: screen_resize_x(s, sx);
1.3 nicm 110:
111: /*
112: * It is unclear what should happen to tabs on resize. xterm
113: * seems to try and maintain them, rxvt resets them. Resetting
114: * is simpler and more reliable so let's do that.
115: */
116: screen_reset_tabs(s);
117: }
118:
1.1 nicm 119: if (sy != screen_size_y(s))
120: screen_resize_y(s, sy);
121: }
122:
123: void
124: screen_resize_x(struct screen *s, u_int sx)
125: {
126: struct grid *gd = s->grid;
127:
128: if (sx == 0)
129: fatalx("zero size");
130:
1.7 nicm 131: /*
132: * Treat resizing horizontally simply: just ensure the cursor is
133: * on-screen and change the size. Don't bother to truncate any lines -
134: * then the data should be accessible if the size is then incrased.
135: *
136: * The only potential wrinkle is if UTF-8 double-width characters are
137: * left in the last column, but UTF-8 terminals should deal with this
138: * sanely.
139: */
1.1 nicm 140: if (s->cx >= sx)
141: s->cx = sx - 1;
142: gd->sx = sx;
143: }
144:
145: void
146: screen_resize_y(struct screen *s, u_int sy)
147: {
148: struct grid *gd = s->grid;
1.4 nicm 149: u_int needed, available, oldy, i;
1.1 nicm 150:
151: if (sy == 0)
152: fatalx("zero size");
1.4 nicm 153: oldy = screen_size_y(s);
154:
1.12 nicm 155: /*
1.4 nicm 156: * When resizing:
157: *
158: * If the height is decreasing, delete lines from the bottom until
159: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 160: *
1.4 nicm 161: * When increasing, pull as many lines as possible from the history to
162: * the top, then fill the remaining with blanks at the bottom.
163: */
1.1 nicm 164:
165: /* Size decreasing. */
1.4 nicm 166: if (sy < oldy) {
167: needed = oldy - sy;
1.1 nicm 168:
1.4 nicm 169: /* Delete as many lines as possible from the bottom. */
170: available = oldy - 1 - s->cy;
171: if (available > 0) {
172: if (available > needed)
173: available = needed;
174: grid_view_delete_lines(gd, oldy - available, available);
1.1 nicm 175: }
1.4 nicm 176: needed -= available;
1.1 nicm 177:
1.4 nicm 178: /*
1.8 nicm 179: * Now just increase the history size, if possible, to take
180: * over the lines which are left. If history is off, delete
181: * lines from the top.
182: *
183: * XXX Should apply history limit?
1.4 nicm 184: */
1.8 nicm 185: available = s->cy;
186: if (gd->flags & GRID_HISTORY)
187: gd->hsize += needed;
1.9 nicm 188: else if (needed > 0 && available > 0) {
1.8 nicm 189: if (available > needed)
190: available = needed;
191: grid_view_delete_lines(gd, 0, available);
192: }
1.4 nicm 193: s->cy -= needed;
1.12 nicm 194: }
1.1 nicm 195:
196: /* Resize line arrays. */
1.11 nicm 197: gd->linedata = xrealloc(
198: gd->linedata, gd->hsize + sy, sizeof *gd->linedata);
1.1 nicm 199:
200: /* Size increasing. */
1.4 nicm 201: if (sy > oldy) {
202: needed = sy - oldy;
203:
1.8 nicm 204: /*
205: * Try to pull as much as possible out of the history, if is
206: * is enabled.
207: */
1.4 nicm 208: available = gd->hsize;
1.8 nicm 209: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 210: if (available > needed)
211: available = needed;
212: gd->hsize -= available;
213: s->cy += available;
1.8 nicm 214: } else
215: available = 0;
1.4 nicm 216: needed -= available;
217:
218: /* Then fill the rest in with blanks. */
1.11 nicm 219: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
220: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 221: }
222:
1.4 nicm 223: /* Set the new size, and reset the scroll region. */
1.1 nicm 224: gd->sy = sy;
225: s->rupper = 0;
226: s->rlower = screen_size_y(s) - 1;
227: }
228:
229: /* Set selection. */
230: void
1.14 ! nicm 231: screen_set_selection(struct screen *s, u_int sx, u_int sy,
! 232: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 233: {
234: struct screen_sel *sel = &s->sel;
235:
236: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 237: sel->flag = 1;
1.14 ! nicm 238: sel->rectflag = rectflag;
1.13 nicm 239:
1.14 ! nicm 240: sel->sx = sx; sel->sy = sy;
! 241: sel->ex = ex; sel->ey = ey;
1.1 nicm 242: }
243:
244: /* Clear selection. */
245: void
246: screen_clear_selection(struct screen *s)
247: {
248: struct screen_sel *sel = &s->sel;
249:
250: sel->flag = 0;
251: }
252:
253: /* Check if cell in selection. */
254: int
255: screen_check_selection(struct screen *s, u_int px, u_int py)
256: {
257: struct screen_sel *sel = &s->sel;
258:
1.14 ! nicm 259: if (!sel->flag)
1.1 nicm 260: return (0);
261:
1.14 ! nicm 262: if (sel->rectflag) {
! 263: if (sel->sy < sel->ey) {
! 264: /* start line < end line -- downward selection. */
! 265: if (py < sel->sy || py > sel->ey)
! 266: return (0);
! 267: } else if (sel->sy > sel->ey) {
! 268: /* start line > end line -- upward selection. */
! 269: if (py > sel->sy || py < sel->ey)
! 270: return (0);
! 271: } else {
! 272: /* starting line == ending line. */
! 273: if (py != sel->sy)
! 274: return (0);
! 275: }
! 276:
! 277: /*
! 278: * Need to include the selection start row, but not the cursor
! 279: * row, which means the selection changes depending on which
! 280: * one is on the left.
! 281: */
! 282: if (sel->ex < sel->sx) {
! 283: /* Cursor (ex) is on the left. */
! 284: if (px <= sel->ex)
! 285: return (0);
! 286:
! 287: if (px > sel->sx)
! 288: return (0);
! 289: } else {
! 290: /* Selection start (sx) is on the left. */
! 291: if (px < sel->sx)
! 292: return (0);
! 293:
! 294: if (px >= sel->ex)
! 295: return (0);
! 296: }
! 297: } else {
! 298: /*
! 299: * Like emacs, keep the top-left-most character, and drop the
! 300: * bottom-right-most, regardless of copy direction.
! 301: */
! 302: if (sel->sy < sel->ey) {
! 303: /* starting line < ending line -- downward selection. */
! 304: if (py < sel->sy || py > sel->ey)
! 305: return (0);
! 306:
! 307: if ((py == sel->sy && px < sel->sx)
! 308: || (py == sel->ey && px > sel->ex))
! 309: return (0);
! 310: } else if (sel->sy > sel->ey) {
! 311: /* starting line > ending line -- upward selection. */
! 312: if (py > sel->sy || py < sel->ey)
! 313: return (0);
! 314:
! 315: if ((py == sel->sy && px >= sel->sx)
! 316: || (py == sel->ey && px < sel->ex))
! 317: return (0);
! 318: } else {
! 319: /* starting line == ending line. */
! 320: if (py != sel->sy)
! 321: return (0);
! 322:
! 323: if (sel->ex < sel->sx) {
! 324: /* cursor (ex) is on the left */
! 325: if (px > sel->sx || px < sel->ex)
! 326: return (0);
! 327: } else {
! 328: /* selection start (sx) is on the left */
! 329: if (px < sel->sx || px > sel->ex)
! 330: return (0);
! 331: }
! 332: }
1.1 nicm 333: }
334:
335: return (1);
336: }
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