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) 2009-2016
   7    Free Software Foundation, Inc.
   8
   9    Written by:
  10    Daniel Borca <dborca@yahoo.com>, 2007
  11    Andrew Borodin <aborodin@vmail.ru>, 2010, 2013
  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 #include "lib/global.h"
  36 #include "lib/tty/tty.h"        /* LINES, COLS */
  37 #include "lib/tty/color.h"      /* tty_set_normal_attrs() */
  38 #ifdef HAVE_SLANG
  39 #include "lib/tty/win.h"        /* do_enter_ca_mode() */
  40 #endif
  41 #include "lib/widget.h"
  42 #include "lib/event.h"
  43
  44 /*** global variables ****************************************************************************/
  45
  46 WDialog *midnight_dlg = NULL;
  47
  48 /*** file scope macro definitions ****************************************************************/
  49
  50 /*** file scope type declarations ****************************************************************/
  51
  52 /*** file scope variables ************************************************************************/
  53
  54 /* List of dialogs: filemanagers, editors, viewers */
  55 static GList *mc_dialogs = NULL;
  56 /* Currently active dialog */
  57 static GList *mc_current = NULL;
  58 /* Is there any dialogs that we have to run after returning to the manager from another dialog */
  59 static gboolean dialog_switch_pending = FALSE;
  60
  61 /*** file scope functions ************************************************************************/
  62 /* --------------------------------------------------------------------------------------------- */
  63
  64 static unsigned char
  65 get_hotkey (int n)
  66 {
  67     return (n <= 9) ? '0' + n : 'a' + n - 10;
  68 }
  69
  70 /* --------------------------------------------------------------------------------------------- */
  71
  72 static void
  73 dialog_switch_suspend (void *data, void *user_data)
  74 {
  75     (void) user_data;
  76
  77     if (data != mc_current->data)
  78         DIALOG (data)->state = DLG_SUSPENDED;
  79 }
  80
  81 /* --------------------------------------------------------------------------------------------- */
  82
  83 static void
  84 dialog_switch_goto (GList * dlg)
  85 {
  86     if (mc_current != dlg)
  87     {
  88         WDialog *old = DIALOG (mc_current->data);
  89
  90         mc_current = dlg;
  91
  92         if (old == midnight_dlg)
  93         {
  94             /* switch from panels to another dialog (editor, viewer, etc) */
  95             dialog_switch_pending = TRUE;
  96             dialog_switch_process_pending ();
  97         }
  98         else
  99         {
 100             /* switch from editor, viewer, etc to another dialog */
 101             old->state = DLG_SUSPENDED;
 102
 103             if (DIALOG (dlg->data) != midnight_dlg)
 104                 /* switch to another editor, viewer, etc */
 105                 /* return to panels before run the required dialog */
 106                 dialog_switch_pending = TRUE;
 107             else
 108             {
 109                 /* switch to panels */
 110                 midnight_dlg->state = DLG_ACTIVE;
 111                 do_refresh ();
 112             }
 113         }
 114     }
 115 }
 116
 117 /* --------------------------------------------------------------------------------------------- */
 118
 119 static void
 120 dlg_resize_cb (void *data, void *user_data)
 121 {
 122     WDialog *d = data;
 123
 124     (void) user_data;
 125     if (d->state == DLG_ACTIVE)
 126         send_message (d, NULL, MSG_RESIZE, 0, NULL);
 127     else
 128         d->winch_pending = TRUE;
 129 }
 130
 131 /* --------------------------------------------------------------------------------------------- */
 132 /*** public functions ****************************************************************************/
 133 /* --------------------------------------------------------------------------------------------- */
 134
 135 void
 136 dialog_switch_add (WDialog * h)
 137 {
 138     GList *dlg;
 139
 140     dlg = g_list_find (mc_dialogs, h);
 141
 142     if (dlg != NULL)
 143         mc_current = dlg;
 144     else
 145     {
 146         mc_dialogs = g_list_prepend (mc_dialogs, h);
 147         mc_current = mc_dialogs;
 148     }
 149
 150     /* suspend forced all other screens */
 151     g_list_foreach (mc_dialogs, dialog_switch_suspend, NULL);
 152 }
 153
 154 /* --------------------------------------------------------------------------------------------- */
 155
 156 void
 157 dialog_switch_remove (WDialog * h)
 158 {
 159     GList *this;
 160
 161     if (DIALOG (mc_current->data) == h)
 162         this = mc_current;
 163     else
 164         this = g_list_find (mc_dialogs, h);
 165
 166     mc_dialogs = g_list_delete_link (mc_dialogs, this);
 167
 168     /* adjust current dialog */
 169     if (top_dlg != NULL)
 170         mc_current = g_list_find (mc_dialogs, DIALOG (top_dlg->data));
 171     else
 172         mc_current = mc_dialogs;
 173
 174     /* resume forced the current screen */
 175     if (mc_current != NULL)
 176         DIALOG (mc_current->data)->state = DLG_ACTIVE;
 177 }
 178
 179 /* --------------------------------------------------------------------------------------------- */
 180
 181 size_t
 182 dialog_switch_num (void)
 183 {
 184     return g_list_length (mc_dialogs);
 185 }
 186
 187 /* --------------------------------------------------------------------------------------------- */
 188
 189 void
 190 dialog_switch_next (void)
 191 {
 192     GList *next;
 193
 194     if (mc_global.midnight_shutdown || mc_current == NULL)
 195         return;
 196
 197     next = g_list_next (mc_current);
 198     if (next == NULL)
 199         next = mc_dialogs;
 200
 201     dialog_switch_goto (next);
 202 }
 203
 204 /* --------------------------------------------------------------------------------------------- */
 205
 206 void
 207 dialog_switch_prev (void)
 208 {
 209     GList *prev;
 210
 211     if (mc_global.midnight_shutdown || mc_current == NULL)
 212         return;
 213
 214     prev = g_list_previous (mc_current);
 215     if (prev == NULL)
 216         prev = g_list_last (mc_dialogs);
 217
 218     dialog_switch_goto (prev);
 219 }
 220
 221 /* --------------------------------------------------------------------------------------------- */
 222
 223 void
 224 dialog_switch_list (void)
 225 {
 226     const size_t dlg_num = g_list_length (mc_dialogs);
 227     int lines, cols;
 228     Listbox *listbox;
 229     GList *h;
 230     int i = 0;
 231     int rv;
 232
 233     if (mc_global.midnight_shutdown || mc_current == NULL)
 234         return;
 235
 236     lines = min ((size_t) (LINES * 2 / 3), dlg_num);
 237     cols = COLS * 2 / 3;
 238
 239     listbox = create_listbox_window (lines, cols, _("Screens"), "[Screen selector]");
 240
 241     for (h = mc_dialogs; h != NULL; h = g_list_next (h))
 242     {
 243         WDialog *dlg;
 244         char *title;
 245
 246         dlg = DIALOG (h->data);
 247
 248         if ((dlg != NULL) && (dlg->get_title != NULL))
 249             title = dlg->get_title (dlg, WIDGET (listbox->list)->cols - 2);
 250         else
 251             title = g_strdup ("");
 252
 253         listbox_add_item (listbox->list, LISTBOX_APPEND_BEFORE, get_hotkey (i++), title, NULL,
 254                           FALSE);
 255
 256         g_free (title);
 257     }
 258
 259     listbox_select_entry (listbox->list, dlg_num - 1 - g_list_position (mc_dialogs, mc_current));
 260     rv = run_listbox (listbox);
 261
 262     if (rv >= 0)
 263     {
 264         h = g_list_nth (mc_dialogs, dlg_num - 1 - rv);
 265         dialog_switch_goto (h);
 266     }
 267 }
 268
 269 /* --------------------------------------------------------------------------------------------- */
 270
 271 int
 272 dialog_switch_process_pending (void)
 273 {
 274     int ret = 0;
 275
 276     while (dialog_switch_pending)
 277     {
 278         WDialog *h = DIALOG (mc_current->data);
 279
 280         dialog_switch_pending = FALSE;
 281         h->state = DLG_SUSPENDED;
 282         ret = dlg_run (h);
 283         if (h->state == DLG_CLOSED)
 284         {
 285             dlg_destroy (h);
 286
 287             /* return to panels */
 288             if (mc_global.mc_run_mode == MC_RUN_FULL)
 289             {
 290                 mc_current = g_list_find (mc_dialogs, midnight_dlg);
 291                 mc_event_raise (MCEVENT_GROUP_FILEMANAGER, "update_panels", NULL);
 292             }
 293         }
 294     }
 295
 296     repaint_screen ();
 297
 298     return ret;
 299 }
 300
 301 /* --------------------------------------------------------------------------------------------- */
 302
 303 void
 304 dialog_switch_got_winch (void)
 305 {
 306     GList *dlg;
 307
 308     for (dlg = mc_dialogs; dlg != NULL; dlg = g_list_next (dlg))
 309         if (dlg != mc_current)
 310             DIALOG (dlg->data)->winch_pending = TRUE;
 311 }
 312
 313 /* --------------------------------------------------------------------------------------------- */
 314
 315 void
 316 dialog_switch_shutdown (void)
 317 {
 318     while (mc_dialogs != NULL)
 319     {
 320         WDialog *dlg = DIALOG (mc_dialogs->data);
 321
 322         dlg_run (dlg);
 323         dlg_destroy (dlg);
 324     }
 325 }
 326
 327 /* --------------------------------------------------------------------------------------------- */
 328
 329 void
 330 clr_scr (void)
 331 {
 332     tty_set_normal_attrs ();
 333     tty_fill_region (0, 0, LINES, COLS, ' ');
 334     tty_refresh ();
 335 }
 336
 337 /* --------------------------------------------------------------------------------------------- */
 338
 339 void
 340 repaint_screen (void)
 341 {
 342     do_refresh ();
 343     tty_refresh ();
 344 }
 345
 346 /* --------------------------------------------------------------------------------------------- */
 347
 348 void
 349 mc_refresh (void)
 350 {
 351 #ifdef ENABLE_BACKGROUND
 352     if (mc_global.we_are_background)
 353         return;
 354 #endif /* ENABLE_BACKGROUND */
 355     if (mc_global.tty.winch_flag == 0)
 356         tty_refresh ();
 357     else
 358     {
 359         /* if winch was caugth, we should do not only redraw screen, but
 360            reposition/resize all */
 361         dialog_change_screen_size ();
 362     }
 363 }
 364
 365 /* --------------------------------------------------------------------------------------------- */
 366
 367 void
 368 dialog_change_screen_size (void)
 369 {
 370     mc_global.tty.winch_flag = 0;
 371
 372     tty_change_screen_size ();
 373
 374 #ifdef HAVE_SLANG
 375     do_enter_ca_mode ();
 376     tty_keypad (TRUE);
 377     tty_nodelay (FALSE);
 378 #endif
 379
 380     /* Inform all suspending dialogs */
 381     dialog_switch_got_winch ();
 382     /* Inform all running dialogs */
 383     g_list_foreach (top_dlg, (GFunc) dlg_resize_cb, NULL);
 384
 385     /* Now, force the redraw */
 386     repaint_screen ();
 387 }
 388
 389 /* --------------------------------------------------------------------------------------------- */