resize.c

   1 /* $OpenBSD$ */
   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
  21 #include <string.h>
  22
  23 #include "tmux.h"
  24
  25 /*
  26  * Recalculate window and session sizes.
  27  *
  28  * Every session has the size of the smallest client it is attached to and
  29  * every window the size of the smallest session it is attached to.
  30  *
  31  * So, when a client is resized or a session attached to or detached from a
  32  * client, the window sizes must be recalculated. For each session, find the
  33  * smallest client it is attached to, and resize it to that size. Then for
  34  * every window, find the smallest session it is attached to, resize it to that
  35  * size and clear and redraw every client with it as the current window.
  36  *
  37  * This is quite inefficient - better/additional data structures are needed
  38  * to make it better.
  39  *
  40  * As a side effect, this function updates the SESSION_UNATTACHED flag. This
  41  * flag is necessary to make sure unattached sessions do not limit the size of
  42  * windows that are attached both to them and to other (attached) sessions.
  43  */
  44
  45 void
  46 recalculate_sizes(void)
  47 {
  48         struct session          *s;
  49         struct client           *c;
  50         struct window           *w;
  51         struct window_pane      *wp;
  52         u_int                    i, j, ssx, ssy, has, limit;
  53         int                      flag;
  54
  55         RB_FOREACH(s, sessions, &sessions) {
  56                 ssx = ssy = UINT_MAX;
  57                 for (j = 0; j < ARRAY_LENGTH(&clients); j++) {
  58                         c = ARRAY_ITEM(&clients, j);
  59                         if (c == NULL || c->flags & CLIENT_SUSPENDED)
  60                                 continue;
  61                         if (c->session == s) {
  62                                 if (c->tty.sx < ssx)
  63                                         ssx = c->tty.sx;
  64                                 if (c->tty.sy < ssy)
  65                                         ssy = c->tty.sy;
  66                         }
  67                 }
  68                 if (ssx == UINT_MAX || ssy == UINT_MAX) {
  69                         s->flags |= SESSION_UNATTACHED;
  70                         continue;
  71                 }
  72                 s->flags &= ~SESSION_UNATTACHED;
  73
  74                 if (options_get_number(&s->options, "status")) {
  75                         if (ssy == 0)
  76                                 ssy = 1;
  77                         else
  78                                 ssy--;
  79                 }
  80                 if (s->sx == ssx && s->sy == ssy)
  81                         continue;
  82
  83                 log_debug(
  84                     "session size %u,%u (was %u,%u)", ssx, ssy, s->sx, s->sy);
  85
  86                 s->sx = ssx;
  87                 s->sy = ssy;
  88         }
  89
  90         for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
  91                 w = ARRAY_ITEM(&windows, i);
  92                 if (w == NULL)
  93                         continue;
  94                 flag = options_get_number(&w->options, "aggressive-resize");
  95
  96                 ssx = ssy = UINT_MAX;
  97                 RB_FOREACH(s, sessions, &sessions) {
  98                         if (s->flags & SESSION_UNATTACHED)
  99                                 continue;
 100                         if (flag)
 101                                 has = s->curw->window == w;
 102                         else
 103                                 has = session_has(s, w) != NULL;
 104                         if (has) {
 105                                 if (s->sx < ssx)
 106                                         ssx = s->sx;
 107                                 if (s->sy < ssy)
 108                                         ssy = s->sy;
 109                         }
 110                 }
 111                 if (ssx == UINT_MAX || ssy == UINT_MAX)
 112                         continue;
 113
 114                 limit = options_get_number(&w->options, "force-width");
 115                 if (limit != 0 && ssx > limit)
 116                         ssx = limit;
 117                 limit = options_get_number(&w->options, "force-height");
 118                 if (limit != 0 && ssy > limit)
 119                         ssy = limit;
 120
 121                 if (w->sx == ssx && w->sy == ssy)
 122                         continue;
 123
 124                 log_debug(
 125                     "window size %u,%u (was %u,%u)", ssx, ssy, w->sx, w->sy);
 126
 127                 layout_resize(w, ssx, ssy);
 128                 window_resize(w, ssx, ssy);
 129
 130                 /*
 131                  * If the current pane is now not visible, move to the next
 132                  * that is.
 133                  */
 134                 wp = w->active;
 135                 while (!window_pane_visible(w->active)) {
 136                         w->active = TAILQ_PREV(w->active, window_panes, entry);
 137                         if (w->active == NULL)
 138                                 w->active = TAILQ_LAST(&w->panes, window_panes);
 139                         if (w->active == wp)
 140                                break;
 141                 }
 142
 143                 server_redraw_window(w);
 144         }
 145 }