Annotation of src/usr.bin/tmux/screen.c, Revision 1.10
1.10 ! nicm 1: /* $OpenBSD: screen.c,v 1.9 2009/07/17 18:35:11 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;
1.3 nicm 54:
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:
155: /*
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.
160: *
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;
194: }
1.1 nicm 195:
196: /* Resize line arrays. */
197: gd->size = xrealloc(gd->size, gd->hsize + sy, sizeof *gd->size);
198: gd->data = xrealloc(gd->data, gd->hsize + sy, sizeof *gd->data);
199: gd->usize = xrealloc(gd->usize, gd->hsize + sy, sizeof *gd->usize);
200: gd->udata = xrealloc(gd->udata, gd->hsize + sy, sizeof *gd->udata);
201:
202: /* Size increasing. */
1.4 nicm 203: if (sy > oldy) {
204: needed = sy - oldy;
205:
1.8 nicm 206: /*
207: * Try to pull as much as possible out of the history, if is
208: * is enabled.
209: */
1.4 nicm 210: available = gd->hsize;
1.8 nicm 211: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 212: if (available > needed)
213: available = needed;
214: gd->hsize -= available;
215: s->cy += available;
1.8 nicm 216: } else
217: available = 0;
1.4 nicm 218: needed -= available;
219:
220: /* Then fill the rest in with blanks. */
221: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++) {
1.5 nicm 222: gd->size[i] = 0;
223: gd->data[i] = NULL;
224: gd->usize[i] = 0;
225: gd->udata[i] = NULL;
1.1 nicm 226: }
227: }
228:
1.4 nicm 229: /* Set the new size, and reset the scroll region. */
1.1 nicm 230: gd->sy = sy;
231: s->rupper = 0;
232: s->rlower = screen_size_y(s) - 1;
233: }
234:
235: /* Set selection. */
236: void
237: screen_set_selection(struct screen *s,
238: u_int sx, u_int sy, u_int ex, u_int ey, struct grid_cell *gc)
239: {
240: struct screen_sel *sel = &s->sel;
241:
242: memcpy(&sel->cell, gc, sizeof sel->cell);
243:
244: sel->flag = 1;
245: if (ey < sy || (sy == ey && ex < sx)) {
246: sel->sx = ex; sel->sy = ey;
247: sel->ex = sx; sel->ey = sy;
248: } else {
249: sel->sx = sx; sel->sy = sy;
250: sel->ex = ex; sel->ey = ey;
251: }
252: }
253:
254: /* Clear selection. */
255: void
256: screen_clear_selection(struct screen *s)
257: {
258: struct screen_sel *sel = &s->sel;
259:
260: sel->flag = 0;
261: }
262:
263: /* Check if cell in selection. */
264: int
265: screen_check_selection(struct screen *s, u_int px, u_int py)
266: {
267: struct screen_sel *sel = &s->sel;
268:
269: if (!sel->flag || py < sel->sy || py > sel->ey)
270: return (0);
271:
272: if (py == sel->sy && py == sel->ey) {
273: if (px < sel->sx || px > sel->ex)
274: return (0);
275: return (1);
276: }
277:
278: if ((py == sel->sy && px < sel->sx) || (py == sel->ey && px > sel->ex))
279: return (0);
280: return (1);
281: }
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