lib/widget/dialog-switch.c

   1 /*
   2    Support of multiply editors and viewers.
   3
   4    Original idea and code: Oleg "Olegarch" Konovalov <olegarch@linuxinside.com>
   5
   6    Copyright (c) 2009, 2010, 2011
   7    The Free Software Foundation
   8
   9    Written by:
  10    Daniel Borca <dborca@yahoo.com>, 2007
  11    Andrew Borodin <aborodin@vmail.ru>, 2010
  12
  13    This file is part of the Midnight Commander.
  14
  15    The Midnight Commander is free software: you can redistribute it
  16    and/or modify it under the terms of the GNU General Public License as
  17    published by the Free Software Foundation, either version 3 of the License,
  18    or (at your option) any later version.
  19
  20    The Midnight Commander is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27  */
  28
  29 /** \file dialog-switch.c
  30  *  \brief Source: support of multiply editors and viewers.
  31  */
  32
  33 #include <config.h>
  34
  35 /* If TIOCGWINSZ supported, make it available here, because window resizing code
  36  * depends on it... */
  37 #ifdef HAVE_SYS_IOCTL_H
  38 #include <sys/ioctl.h>
  39 #endif
  40 #include <termios.h>
  41
  42 #include "lib/global.h"
  43 #include "lib/tty/tty.h"        /* LINES, COLS */
  44 #include "lib/tty/win.h"        /* do_enter_ca_mode() */
  45 #include "lib/tty/color.h"      /* tty_set_normal_attrs() */
  46 #include "lib/widget.h"
  47 #include "lib/event.h"
  48
  49 /*** global variables ****************************************************************************/
  50
  51 Dlg_head *midnight_dlg = NULL;
  52
  53 /*** file scope macro definitions ****************************************************************/
  54
  55 /*** file scope type declarations ****************************************************************/
  56
  57 /*** file scope variables ************************************************************************/
  58
  59 /* List of dialogs: filemanagers, editors, viewers */
  60 static GList *mc_dialogs = NULL;
  61 /* Currently active dialog */
  62 static GList *mc_current = NULL;
  63 /* Is there any dialogs that we have to run after returning to the manager from another dialog */
  64 static gboolean dialog_switch_pending = FALSE;
  65
  66 /*** file scope functions ************************************************************************/
  67 /* --------------------------------------------------------------------------------------------- */
  68
  69 static unsigned char
  70 get_hotkey (int n)
  71 {
  72     return (n <= 9) ? '0' + n : 'a' + n - 10;
  73 }
  74
  75 /* --------------------------------------------------------------------------------------------- */
  76
  77 static void
  78 dialog_switch_goto (GList * dlg)
  79 {
  80     if (mc_current != dlg)
  81     {
  82         Dlg_head *old = (Dlg_head *) mc_current->data;
  83
  84         mc_current = dlg;
  85
  86         if (old == midnight_dlg)
  87         {
  88             /* switch from panels to another dialog (editor, viewer, etc) */
  89             dialog_switch_pending = TRUE;
  90             dialog_switch_process_pending ();
  91         }
  92         else
  93         {
  94             /* switch from editor, viewer, etc to another dialog */
  95             old->state = DLG_SUSPENDED;
  96
  97             if ((Dlg_head *) dlg->data != midnight_dlg)
  98                 /* switch to another editor, viewer, etc */
  99                 /* return to panels before run the required dialog */
 100                 dialog_switch_pending = TRUE;
 101             else
 102                 /* switch to panels */
 103                 do_refresh ();
 104         }
 105     }
 106 }
 107
 108 /* --------------------------------------------------------------------------------------------- */
 109
 110 #if defined TIOCGWINSZ
 111 static void
 112 dlg_resize_cb (void *data, void *user_data)
 113 {
 114     Dlg_head *d = data;
 115
 116     (void) user_data;
 117     d->callback (d, NULL, DLG_RESIZE, 0, NULL);
 118 }
 119 #endif
 120
 121 /* --------------------------------------------------------------------------------------------- */
 122 /*** public functions ****************************************************************************/
 123 /* --------------------------------------------------------------------------------------------- */
 124
 125 void
 126 dialog_switch_add (Dlg_head * h)
 127 {
 128     GList *dlg;
 129
 130     dlg = g_list_find (mc_dialogs, h);
 131
 132     if (dlg != NULL)
 133         mc_current = dlg;
 134     else
 135     {
 136         mc_dialogs = g_list_prepend (mc_dialogs, h);
 137         mc_current = mc_dialogs;
 138     }
 139 }
 140
 141 /* --------------------------------------------------------------------------------------------- */
 142
 143 void
 144 dialog_switch_remove (Dlg_head * h)
 145 {
 146     GList *this;
 147
 148     if ((Dlg_head *) mc_current->data == h)
 149         this = mc_current;
 150     else
 151         this = g_list_find (mc_dialogs, h);
 152
 153     mc_dialogs = g_list_delete_link (mc_dialogs, this);
 154
 155     /* adjust current dialog */
 156     if (top_dlg != NULL)
 157         mc_current = g_list_find (mc_dialogs, (Dlg_head *) top_dlg->data);
 158     else
 159         mc_current = mc_dialogs;
 160 }
 161
 162 /* --------------------------------------------------------------------------------------------- */
 163
 164 size_t
 165 dialog_switch_num (void)
 166 {
 167     return g_list_length (mc_dialogs);
 168 }
 169
 170 /* --------------------------------------------------------------------------------------------- */
 171
 172 void
 173 dialog_switch_next (void)
 174 {
 175     GList *next;
 176
 177     if (mc_global.widget.midnight_shutdown || mc_current == NULL)
 178         return;
 179
 180     next = g_list_next (mc_current);
 181     if (next == NULL)
 182         next = mc_dialogs;
 183
 184     dialog_switch_goto (next);
 185 }
 186
 187 /* --------------------------------------------------------------------------------------------- */
 188
 189 void
 190 dialog_switch_prev (void)
 191 {
 192     GList *prev;
 193
 194     if (mc_global.widget.midnight_shutdown || mc_current == NULL)
 195         return;
 196
 197     prev = g_list_previous (mc_current);
 198     if (prev == NULL)
 199         prev = g_list_last (mc_dialogs);
 200
 201     dialog_switch_goto (prev);
 202 }
 203
 204 /* --------------------------------------------------------------------------------------------- */
 205
 206 void
 207 dialog_switch_list (void)
 208 {
 209     const size_t dlg_num = g_list_length (mc_dialogs);
 210     int lines, cols;
 211     Listbox *listbox;
 212     GList *h;
 213     int i = 0;
 214     int rv;
 215
 216     if (mc_global.widget.midnight_shutdown || mc_current == NULL)
 217         return;
 218
 219     lines = min ((size_t) (LINES * 2 / 3), dlg_num);
 220     cols = COLS * 2 / 3;
 221
 222     listbox = create_listbox_window (lines, cols, _("Screens"), "[Screen selector]");
 223
 224     for (h = mc_dialogs; h != NULL; h = g_list_next (h))
 225     {
 226         Dlg_head *dlg;
 227         char *title;
 228
 229         dlg = (Dlg_head *) h->data;
 230
 231         if ((dlg != NULL) && (dlg->get_title != NULL))
 232             title = dlg->get_title (dlg, listbox->list->widget.cols - 2);       /* FIXME! */
 233         else
 234             title = g_strdup ("");
 235
 236         listbox_add_item (listbox->list, LISTBOX_APPEND_BEFORE, get_hotkey (i++), title, NULL);
 237
 238         g_free (title);
 239     }
 240
 241     listbox_select_entry (listbox->list, dlg_num - 1 - g_list_position (mc_dialogs, mc_current));
 242     rv = run_listbox (listbox);
 243
 244     if (rv >= 0)
 245     {
 246         h = g_list_nth (mc_dialogs, dlg_num - 1 - rv);
 247         dialog_switch_goto (h);
 248     }
 249 }
 250
 251 /* --------------------------------------------------------------------------------------------- */
 252
 253 int
 254 dialog_switch_process_pending (void)
 255 {
 256     int ret = 0;
 257
 258     while (dialog_switch_pending)
 259     {
 260         Dlg_head *h = (Dlg_head *) mc_current->data;
 261
 262         dialog_switch_pending = FALSE;
 263         h->state = DLG_SUSPENDED;
 264         ret = run_dlg (h);
 265         if (h->state == DLG_CLOSED)
 266         {
 267             destroy_dlg (h);
 268             /* return to panels */
 269             if (mc_global.mc_run_mode == MC_RUN_FULL)
 270             {
 271                 mc_current = g_list_find (mc_dialogs, midnight_dlg);
 272                 mc_event_raise (MCEVENT_GROUP_FILEMANAGER, "update_panels", NULL);
 273             }
 274         }
 275     }
 276
 277     repaint_screen ();
 278
 279     return ret;
 280 }
 281
 282 /* --------------------------------------------------------------------------------------------- */
 283
 284 void
 285 dialog_switch_got_winch (void)
 286 {
 287     GList *dlg;
 288
 289     for (dlg = mc_dialogs; dlg != NULL; dlg = g_list_next (dlg))
 290         if (dlg != mc_current)
 291             ((Dlg_head *) dlg->data)->winch_pending = TRUE;
 292 }
 293
 294 /* --------------------------------------------------------------------------------------------- */
 295
 296 void
 297 dialog_switch_shutdown (void)
 298 {
 299     while (mc_dialogs != NULL)
 300     {
 301         Dlg_head *dlg = (Dlg_head *) mc_dialogs->data;
 302
 303         run_dlg (dlg);
 304         destroy_dlg (dlg);
 305     }
 306 }
 307
 308 /* --------------------------------------------------------------------------------------------- */
 309
 310 void
 311 clr_scr (void)
 312 {
 313     tty_set_normal_attrs ();
 314     tty_fill_region (0, 0, LINES, COLS, ' ');
 315     tty_refresh ();
 316 }
 317
 318 /* --------------------------------------------------------------------------------------------- */
 319
 320 void
 321 repaint_screen (void)
 322 {
 323     do_refresh ();
 324     tty_refresh ();
 325 }
 326
 327 /* --------------------------------------------------------------------------------------------- */
 328
 329 void
 330 mc_refresh (void)
 331 {
 332 #ifdef WITH_BACKGROUND
 333     if (mc_global.we_are_background)
 334         return;
 335 #endif /* WITH_BACKGROUND */
 336     if (!mc_global.tty.winch_flag)
 337         tty_refresh ();
 338     else
 339     {
 340         /* if winch was caugth, we should do not only redraw screen, but
 341            reposition/resize all */
 342         dialog_change_screen_size ();
 343     }
 344 }
 345
 346 /* --------------------------------------------------------------------------------------------- */
 347
 348 void
 349 dialog_change_screen_size (void)
 350 {
 351     mc_global.tty.winch_flag = FALSE;
 352 #if defined(HAVE_SLANG) || NCURSES_VERSION_MAJOR >= 4
 353 #if defined TIOCGWINSZ
 354
 355 #ifndef NCURSES_VERSION
 356     tty_noraw_mode ();
 357     tty_reset_screen ();
 358 #endif
 359     tty_change_screen_size ();
 360 #ifdef HAVE_SLANG
 361     /* XSI Curses spec states that portable applications shall not invoke
 362      * initscr() more than once.  This kludge could be done within the scope
 363      * of the specification by using endwin followed by a refresh (in fact,
 364      * more than one curses implementation does this); it is guaranteed to work
 365      * only with slang.
 366      */
 367     SLsmg_init_smg ();
 368     do_enter_ca_mode ();
 369     tty_keypad (TRUE);
 370     tty_nodelay (FALSE);
 371 #endif
 372
 373     /* Inform all suspending dialogs */
 374     dialog_switch_got_winch ();
 375     /* Inform all running dialogs */
 376     g_list_foreach (top_dlg, (GFunc) dlg_resize_cb, NULL);
 377
 378     /* Now, force the redraw */
 379     repaint_screen ();
 380
 381 #endif /* TIOCGWINSZ */
 382 #endif /* defined(HAVE_SLANG) || NCURSES_VERSION_MAJOR >= 4 */
 383 }
 384
 385 /* --------------------------------------------------------------------------------------------- */