lib/widget/dialog.c

lib/widget/dialog.c
/* */
This source file includes following definitions.
dlg_default_get_colors
dlg_read_history
refresh_cmd
dlg_execute_cmd
dlg_handle_key
dlg_key_event
dlg_handle_mouse_event
frontend_dlg_run
dlg_default_callback
dlg_default_mouse_callback
dlg_create
dlg_set_default_colors
do_refresh
dlg_stop
dlg_init
dlg_process_event
dlg_run_done
dlg_run
dlg_destroy
dlg_save_history
dlg_get_title
   1 /*
   2    Dialog box features module for the Midnight Commander
   3 
   4    Copyright (C) 1994-2020
   5    Free Software Foundation, Inc.
   6 
   7    This file is part of the Midnight Commander.
   8 
   9    The Midnight Commander is free software: you can redistribute it
  10    and/or modify it under the terms of the GNU General Public License as
  11    published by the Free Software Foundation, either version 3 of the License,
  12    or (at your option) any later version.
  13 
  14    The Midnight Commander is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18 
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22 
  23 /** \file dialog.c
  24  *  \brief Source: dialog box features module
  25  */
  26 
  27 #include <config.h>
  28 
  29 #include <ctype.h>
  30 #include <errno.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 
  37 #include "lib/global.h"
  38 
  39 #include "lib/tty/tty.h"
  40 #include "lib/skin.h"
  41 #include "lib/tty/key.h"
  42 #include "lib/strutil.h"
  43 #include "lib/fileloc.h"        /* MC_HISTORY_FILE */
  44 #include "lib/event.h"          /* mc_event_raise() */
  45 #include "lib/util.h"           /* MC_PTR_FREE */
  46 #include "lib/mcconfig.h"       /* num_history_items_recorded */
  47 
  48 #include "lib/widget.h"
  49 #include "lib/widget/mouse.h"
  50 
  51 /*** global variables ****************************************************************************/
  52 
  53 /* Color styles for normal and error dialogs */
  54 dlg_colors_t dialog_colors;
  55 dlg_colors_t alarm_colors;
  56 dlg_colors_t listbox_colors;
  57 
  58 /* Primitive way to check if the the current dialog is our dialog */
  59 /* This is needed by async routines like load_prompt */
  60 GList *top_dlg = NULL;
  61 
  62 /* A hook list for idle events */
  63 hook_t *idle_hook = NULL;
  64 
  65 /* If set then dialogs just clean the screen when refreshing, else */
  66 /* they do a complete refresh, refreshing all the parts of the program */
  67 gboolean fast_refresh = FALSE;
  68 
  69 /* left click outside of dialog closes it */
  70 gboolean mouse_close_dialog = FALSE;
  71 
  72 const global_keymap_t *dialog_map = NULL;
  73 
  74 /*** file scope macro definitions ****************************************************************/
  75 
  76 /*** file scope type declarations ****************************************************************/
  77 
  78 /*** file scope variables ************************************************************************/
  79 
  80 /* --------------------------------------------------------------------------------------------- */
  81 /*** file scope functions ************************************************************************/
  82 /* --------------------------------------------------------------------------------------------- */
  83 
  84 static const int *
  85 dlg_default_get_colors (const Widget * w)
     /*   */
  86 {
  87     return CONST_DIALOG (w)->colors;
  88 }
  89 
  90 /* --------------------------------------------------------------------------------------------- */
  91 /**
  92   * Read histories from the ${XDG_CACHE_HOME}/mc/history file
  93   */
  94 static void
  95 dlg_read_history (WDialog * h)
     /*   */
  96 {
  97     char *profile;
  98     ev_history_load_save_t event_data;
  99 
 100     if (num_history_items_recorded == 0)        /* this is how to disable */
 101         return;
 102 
 103     profile = mc_config_get_full_path (MC_HISTORY_FILE);
 104     event_data.cfg = mc_config_init (profile, TRUE);
 105     event_data.receiver = NULL;
 106 
 107     /* create all histories in dialog */
 108     mc_event_raise (h->event_group, MCEVENT_HISTORY_LOAD, &event_data);
 109 
 110     mc_config_deinit (event_data.cfg);
 111     g_free (profile);
 112 }
 113 
 114 /* --------------------------------------------------------------------------------------------- */
 115 
 116 static void
 117 refresh_cmd (void)
     /*   */
 118 {
 119 #ifdef HAVE_SLANG
 120     tty_touch_screen ();
 121     mc_refresh ();
 122 #else
 123     /* Use this if the refreshes fail */
 124     tty_clear_screen ();
 125     repaint_screen ();
 126 #endif /* HAVE_SLANG */
 127 }
 128 
 129 /* --------------------------------------------------------------------------------------------- */
 130 
 131 static cb_ret_t
 132 dlg_execute_cmd (WDialog * h, long command)
     /*   */
 133 {
 134     WGroup *g = GROUP (h);
 135     cb_ret_t ret = MSG_HANDLED;
 136 
 137     if (send_message (h, NULL, MSG_ACTION, command, NULL) == MSG_HANDLED)
 138         return MSG_HANDLED;
 139 
 140     switch (command)
 141     {
 142     case CK_Ok:
 143         h->ret_value = B_ENTER;
 144         dlg_stop (h);
 145         break;
 146     case CK_Cancel:
 147         h->ret_value = B_CANCEL;
 148         dlg_stop (h);
 149         break;
 150 
 151     case CK_Up:
 152     case CK_Left:
 153         group_select_prev_widget (g);
 154         break;
 155     case CK_Down:
 156     case CK_Right:
 157         group_select_next_widget (g);
 158         break;
 159 
 160     case CK_Help:
 161         {
 162             ev_help_t event_data = { NULL, h->help_ctx };
 163             mc_event_raise (MCEVENT_GROUP_CORE, "help", &event_data);
 164         }
 165         break;
 166 
 167     case CK_Suspend:
 168         mc_event_raise (MCEVENT_GROUP_CORE, "suspend", NULL);
 169         refresh_cmd ();
 170         break;
 171     case CK_Refresh:
 172         refresh_cmd ();
 173         break;
 174 
 175     case CK_ScreenList:
 176         if (!widget_get_state (WIDGET (h), WST_MODAL))
 177             dialog_switch_list ();
 178         else
 179             ret = MSG_NOT_HANDLED;
 180         break;
 181     case CK_ScreenNext:
 182         if (!widget_get_state (WIDGET (h), WST_MODAL))
 183             dialog_switch_next ();
 184         else
 185             ret = MSG_NOT_HANDLED;
 186         break;
 187     case CK_ScreenPrev:
 188         if (!widget_get_state (WIDGET (h), WST_MODAL))
 189             dialog_switch_prev ();
 190         else
 191             ret = MSG_NOT_HANDLED;
 192         break;
 193 
 194     default:
 195         ret = MSG_NOT_HANDLED;
 196     }
 197 
 198     return ret;
 199 }
 200 
 201 /* --------------------------------------------------------------------------------------------- */
 202 
 203 static cb_ret_t
 204 dlg_handle_key (WDialog * h, int d_key)
     /*   */
 205 {
 206     long command;
 207 
 208     command = widget_lookup_key (WIDGET (h), d_key);
 209     if (command == CK_IgnoreKey)
 210         command = keybind_lookup_keymap_command (dialog_map, d_key);
 211     if (command != CK_IgnoreKey)
 212         return dlg_execute_cmd (h, command);
 213 
 214     return MSG_NOT_HANDLED;
 215 }
 216 
 217 /* --------------------------------------------------------------------------------------------- */
 218 
 219 static void
 220 dlg_key_event (WDialog * h, int d_key)
     /*   */
 221 {
 222     Widget *w = WIDGET (h);
 223     WGroup *g = GROUP (h);
 224     cb_ret_t handled;
 225 
 226     if (g->widgets == NULL)
 227         return;
 228 
 229     if (g->current == NULL)
 230         g->current = g->widgets;
 231 
 232     /* TAB used to cycle */
 233     if (!widget_get_options (w, WOP_WANT_TAB))
 234     {
 235         if (d_key == '\t')
 236         {
 237             group_select_next_widget (g);
 238             return;
 239         }
 240         else if ((d_key & ~(KEY_M_SHIFT | KEY_M_CTRL)) == '\t')
 241         {
 242             group_select_prev_widget (g);
 243             return;
 244         }
 245     }
 246 
 247     /* first can dlalog handle the key itself */
 248     handled = send_message (h, NULL, MSG_KEY, d_key, NULL);
 249 
 250     if (handled == MSG_NOT_HANDLED)
 251         handled = group_default_callback (w, NULL, MSG_KEY, d_key, NULL);
 252 
 253     if (handled == MSG_NOT_HANDLED)
 254         handled = dlg_handle_key (h, d_key);
 255 
 256     (void) handled;
 257     send_message (h, NULL, MSG_POST_KEY, d_key, NULL);
 258 }
 259 
 260 /* --------------------------------------------------------------------------------------------- */
 261 
 262 static int
 263 dlg_handle_mouse_event (Widget * w, Gpm_Event * event)
     /*   */
 264 {
 265     if (w->mouse_callback != NULL)
 266     {
 267         int mou;
 268 
 269         mou = mouse_handle_event (w, event);
 270         if (mou != MOU_UNHANDLED)
 271             return mou;
 272     }
 273 
 274     return group_handle_mouse_event (w, event);
 275 }
 276 
 277 /* --------------------------------------------------------------------------------------------- */
 278 
 279 static void
 280 frontend_dlg_run (WDialog * h)
     /*   */
 281 {
 282     Widget *wh = WIDGET (h);
 283     Gpm_Event event;
 284 
 285     event.x = -1;
 286 
 287     /* close opened editors, viewers, etc */
 288     if (!widget_get_state (wh, WST_MODAL) && mc_global.midnight_shutdown)
 289     {
 290         send_message (h, NULL, MSG_VALIDATE, 0, NULL);
 291         return;
 292     }
 293 
 294     while (widget_get_state (wh, WST_ACTIVE))
 295     {
 296         int d_key;
 297 
 298         if (tty_got_winch ())
 299             dialog_change_screen_size ();
 300 
 301         if (is_idle ())
 302         {
 303             if (idle_hook)
 304                 execute_hooks (idle_hook);
 305 
 306             while (widget_get_state (wh, WST_IDLE) && is_idle ())
 307                 send_message (wh, NULL, MSG_IDLE, 0, NULL);
 308 
 309             /* Allow terminating the dialog from the idle handler */
 310             if (!widget_get_state (wh, WST_ACTIVE))
 311                 break;
 312         }
 313 
 314         widget_update_cursor (wh);
 315 
 316         /* Clear interrupt flag */
 317         tty_got_interrupt ();
 318         d_key = tty_get_event (&event, GROUP (h)->mouse_status == MOU_REPEAT, TRUE);
 319 
 320         dlg_process_event (h, d_key, &event);
 321 
 322         if (widget_get_state (wh, WST_CLOSED))
 323             send_message (h, NULL, MSG_VALIDATE, 0, NULL);
 324     }
 325 }
 326 
 327 /* --------------------------------------------------------------------------------------------- */
 328 /*** public functions ****************************************************************************/
 329 /* --------------------------------------------------------------------------------------------- */
 330 /** Default dialog callback */
 331 
 332 cb_ret_t
 333 dlg_default_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data)
     /*   */
 334 {
 335     switch (msg)
 336     {
 337     case MSG_IDLE:
 338         /* we don't want endless loop */
 339         widget_idle (w, FALSE);
 340         return MSG_HANDLED;
 341 
 342     default:
 343         return group_default_callback (w, sender, msg, parm, data);
 344     }
 345 }
 346 
 347 /* --------------------------------------------------------------------------------------------- */
 348 
 349 void
 350 dlg_default_mouse_callback (Widget * w, mouse_msg_t msg, mouse_event_t * event)
     /*   */
 351 {
 352     switch (msg)
 353     {
 354     case MSG_MOUSE_CLICK:
 355         if (event->y < 0 || event->y >= w->lines || event->x < 0 || event->x >= w->cols)
 356         {
 357             DIALOG (w)->ret_value = B_CANCEL;
 358             dlg_stop (DIALOG (w));
 359         }
 360         break;
 361 
 362     default:
 363         /* return MOU_UNHANDLED */
 364         event->result.abort = TRUE;
 365         break;
 366     }
 367 }
 368 
 369 /* --------------------------------------------------------------------------------------------- */
 370 
 371 WDialog *
 372 dlg_create (gboolean modal, int y1, int x1, int lines, int cols, widget_pos_flags_t pos_flags,
     /*   */
 373             gboolean compact, const int *colors, widget_cb_fn callback,
 374             widget_mouse_cb_fn mouse_callback, const char *help_ctx, const char *title)
 375 {
 376     WDialog *new_d;
 377     Widget *w;
 378     WGroup *g;
 379 
 380     new_d = g_new0 (WDialog, 1);
 381     w = WIDGET (new_d);
 382     g = GROUP (new_d);
 383     widget_adjust_position (pos_flags, &y1, &x1, &lines, &cols);
 384     group_init (g, y1, x1, lines, cols, callback != NULL ? callback : dlg_default_callback,
 385                 mouse_callback != NULL ? mouse_callback : dlg_default_mouse_callback);
 386 
 387     w->pos_flags = pos_flags;
 388     w->options |= WOP_SELECTABLE | WOP_TOP_SELECT;
 389     w->state |= WST_FOCUSED;
 390     /* Temporary hack: dialog doesn't have an owner, own itself. */
 391     w->owner = g;
 392 
 393     w->keymap = dialog_map;
 394 
 395     w->mouse_handler = dlg_handle_mouse_event;
 396     w->mouse.forced_capture = mouse_close_dialog && (w->pos_flags & WPOS_FULLSCREEN) == 0;
 397 
 398     w->get_colors = dlg_default_get_colors;
 399 
 400     new_d->colors = colors;
 401     new_d->help_ctx = help_ctx;
 402     new_d->compact = compact;
 403     new_d->data = NULL;
 404 
 405     if (modal)
 406     {
 407         w->state |= WST_MODAL;
 408 
 409         new_d->bg = WIDGET (frame_new (0, 0, w->lines, w->cols, title, FALSE, new_d->compact));
 410         group_add_widget (g, new_d->bg);
 411         frame_set_title (FRAME (new_d->bg), title);
 412     }
 413 
 414     /* unique name of event group for this dialog */
 415     new_d->event_group = g_strdup_printf ("%s_%p", MCEVENT_GROUP_DIALOG, (void *) new_d);
 416 
 417     return new_d;
 418 }
 419 
 420 /* --------------------------------------------------------------------------------------------- */
 421 
 422 void
 423 dlg_set_default_colors (void)
     /*   */
 424 {
 425     dialog_colors[DLG_COLOR_NORMAL] = COLOR_NORMAL;
 426     dialog_colors[DLG_COLOR_FOCUS] = COLOR_FOCUS;
 427     dialog_colors[DLG_COLOR_HOT_NORMAL] = COLOR_HOT_NORMAL;
 428     dialog_colors[DLG_COLOR_HOT_FOCUS] = COLOR_HOT_FOCUS;
 429     dialog_colors[DLG_COLOR_TITLE] = COLOR_TITLE;
 430 
 431     alarm_colors[DLG_COLOR_NORMAL] = ERROR_COLOR;
 432     alarm_colors[DLG_COLOR_FOCUS] = ERROR_FOCUS;
 433     alarm_colors[DLG_COLOR_HOT_NORMAL] = ERROR_HOT_NORMAL;
 434     alarm_colors[DLG_COLOR_HOT_FOCUS] = ERROR_HOT_FOCUS;
 435     alarm_colors[DLG_COLOR_TITLE] = ERROR_TITLE;
 436 
 437     listbox_colors[DLG_COLOR_NORMAL] = PMENU_ENTRY_COLOR;
 438     listbox_colors[DLG_COLOR_FOCUS] = PMENU_SELECTED_COLOR;
 439     listbox_colors[DLG_COLOR_HOT_NORMAL] = PMENU_ENTRY_COLOR;
 440     listbox_colors[DLG_COLOR_HOT_FOCUS] = PMENU_SELECTED_COLOR;
 441     listbox_colors[DLG_COLOR_TITLE] = PMENU_TITLE_COLOR;
 442 }
 443 
 444 /* --------------------------------------------------------------------------------------------- */
 445 
 446 void
 447 do_refresh (void)
     /*   */
 448 {
 449     GList *d = top_dlg;
 450 
 451     if (fast_refresh)
 452     {
 453         if (d != NULL)
 454             widget_draw (WIDGET (d->data));
 455     }
 456     else
 457     {
 458         /* Search first fullscreen dialog */
 459         for (; d != NULL; d = g_list_next (d))
 460             if ((WIDGET (d->data)->pos_flags & WPOS_FULLSCREEN) != 0)
 461                 break;
 462 
 463         /* when small dialog (i.e. error message) is created first,
 464            there is no fullscreen dialog in the stack */
 465         if (d == NULL)
 466             d = g_list_last (top_dlg);
 467 
 468         /* back to top dialog */
 469         for (; d != NULL; d = g_list_previous (d))
 470             widget_draw (WIDGET (d->data));
 471     }
 472 }
 473 
 474 /* --------------------------------------------------------------------------------------------- */
 475 
 476 void
 477 dlg_stop (WDialog * h)
     /*   */
 478 {
 479     widget_set_state (WIDGET (h), WST_CLOSED, TRUE);
 480 }
 481 
 482 /* --------------------------------------------------------------------------------------------- */
 483 /** Init the process */
 484 
 485 void
 486 dlg_init (WDialog * h)
     /*   */
 487 {
 488     WGroup *g = GROUP (h);
 489     Widget *wh = WIDGET (h);
 490 
 491     if (top_dlg != NULL && widget_get_state (WIDGET (top_dlg->data), WST_MODAL))
 492         widget_set_state (wh, WST_MODAL, TRUE);
 493 
 494     /* add dialog to the stack */
 495     top_dlg = g_list_prepend (top_dlg, h);
 496 
 497     /* Initialize dialog manager and widgets */
 498     if (widget_get_state (wh, WST_CONSTRUCT))
 499     {
 500         if (!widget_get_state (wh, WST_MODAL))
 501             dialog_switch_add (h);
 502 
 503         send_message (h, NULL, MSG_INIT, 0, NULL);
 504         group_default_callback (wh, NULL, MSG_INIT, 0, NULL);
 505         dlg_read_history (h);
 506     }
 507 
 508     /* Select the first widget that takes focus */
 509     while (g->current != NULL && !widget_get_options (WIDGET (g->current->data), WOP_SELECTABLE)
 510            && !widget_get_state (WIDGET (g->current->data), WST_DISABLED))
 511         group_set_current_widget_next (g);
 512 
 513     widget_set_state (wh, WST_ACTIVE, TRUE);
 514     /* draw dialog and focus found widget */
 515     widget_set_state (wh, WST_FOCUSED, TRUE);
 516 
 517     h->ret_value = 0;
 518 }
 519 
 520 /* --------------------------------------------------------------------------------------------- */
 521 
 522 void
 523 dlg_process_event (WDialog * h, int key, Gpm_Event * event)
     /*   */
 524 {
 525     switch (key)
 526     {
 527     case EV_NONE:
 528         if (tty_got_interrupt ())
 529             dlg_execute_cmd (h, CK_Cancel);
 530         break;
 531 
 532     case EV_MOUSE:
 533         {
 534             Widget *w = WIDGET (h);
 535 
 536             GROUP (h)->mouse_status = w->mouse_handler (w, event);
 537             break;
 538         }
 539 
 540     default:
 541         dlg_key_event (h, key);
 542         break;
 543     }
 544 }
 545 
 546 /* --------------------------------------------------------------------------------------------- */
 547 /** Shutdown the dlg_run */
 548 
 549 void
 550 dlg_run_done (WDialog * h)
     /*   */
 551 {
 552     top_dlg = g_list_remove (top_dlg, h);
 553 
 554     if (widget_get_state (WIDGET (h), WST_CLOSED))
 555     {
 556         send_message (h, GROUP (h)->current == NULL ? NULL : WIDGET (GROUP (h)->current->data),
 557                       MSG_END, 0, NULL);
 558         if (!widget_get_state (WIDGET (h), WST_MODAL))
 559             dialog_switch_remove (h);
 560     }
 561 }
 562 
 563 /* --------------------------------------------------------------------------------------------- */
 564 /**
 565  * Standard run dialog routine
 566  * We have to keep this routine small so that we can duplicate it's
 567  * behavior on complex routines like the file routines, this way,
 568  * they can call the dlg_process_event without rewriting all the code
 569  */
 570 
 571 int
 572 dlg_run (WDialog * h)
     /*   */
 573 {
 574     dlg_init (h);
 575     frontend_dlg_run (h);
 576     dlg_run_done (h);
 577     return h->ret_value;
 578 }
 579 
 580 /* --------------------------------------------------------------------------------------------- */
 581 
 582 void
 583 dlg_destroy (WDialog * h)
     /*   */
 584 {
 585     /* if some widgets have history, save all history at one moment here */
 586     dlg_save_history (h);
 587     group_default_callback (WIDGET (h), NULL, MSG_DESTROY, 0, NULL);
 588     mc_event_group_del (h->event_group);
 589     g_free (h->event_group);
 590     g_free (h);
 591 
 592     do_refresh ();
 593 }
 594 
 595 /* --------------------------------------------------------------------------------------------- */
 596 
 597 /**
 598   * Write history to the ${XDG_CACHE_HOME}/mc/history file
 599   */
 600 void
 601 dlg_save_history (WDialog * h)
     /*   */
 602 {
 603     char *profile;
 604     int i;
 605 
 606     if (num_history_items_recorded == 0)        /* this is how to disable */
 607         return;
 608 
 609     profile = mc_config_get_full_path (MC_HISTORY_FILE);
 610     i = open (profile, O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
 611     if (i != -1)
 612         close (i);
 613 
 614     /* Make sure the history is only readable by the user */
 615     if (chmod (profile, S_IRUSR | S_IWUSR) != -1 || errno == ENOENT)
 616     {
 617         ev_history_load_save_t event_data;
 618 
 619         event_data.cfg = mc_config_init (profile, FALSE);
 620         event_data.receiver = NULL;
 621 
 622         /* get all histories in dialog */
 623         mc_event_raise (h->event_group, MCEVENT_HISTORY_SAVE, &event_data);
 624 
 625         mc_config_save_file (event_data.cfg, NULL);
 626         mc_config_deinit (event_data.cfg);
 627     }
 628 
 629     g_free (profile);
 630 }
 631 
 632 /* --------------------------------------------------------------------------------------------- */
 633 
 634 char *
 635 dlg_get_title (const WDialog * h, size_t len)
     /*   */
 636 {
 637     char *t;
 638 
 639     if (h == NULL)
 640         abort ();
 641 
 642     if (h->get_title != NULL)
 643         t = h->get_title (h, len);
 644     else
 645         t = g_strdup ("");
 646 
 647     return t;
 648 }
 649 
 650 /* --------------------------------------------------------------------------------------------- */
/* */
root/lib/widget/dialog.c

DEFINITIONS
