lib/widget/listbox-window.c

   1 /*
   2    Widget based utility functions.
   3
   4    Copyright (C) 1994-2020
   5    Free Software Foundation, Inc.
   6
   7    Authors:
   8    Miguel de Icaza, 1994, 1995, 1996
   9    Radek Doulik, 1994, 1995
  10    Jakub Jelinek, 1995
  11    Andrej Borsenkow, 1995
  12    Andrew Borodin <aborodin@vmail.ru>, 2009, 2010, 2013
  13
  14    This file is part of the Midnight Commander.
  15
  16    The Midnight Commander is free software: you can redistribute it
  17    and/or modify it under the terms of the GNU General Public License as
  18    published by the Free Software Foundation, either version 3 of the License,
  19    or (at your option) any later version.
  20
  21    The Midnight Commander is distributed in the hope that it will be useful,
  22    but WITHOUT ANY WARRANTY; without even the implied warranty of
  23    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24    GNU General Public License for more details.
  25
  26    You should have received a copy of the GNU General Public License
  27    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  28  */
  29
  30 /** \file listbox-window.c
  31  *  \brief Source: Listbox widget, a listbox within dialog window
  32  */
  33
  34 #include <config.h>
  35
  36 #include <stdlib.h>
  37
  38 #include "lib/global.h"
  39 #include "lib/tty/tty.h"        /* COLS */
  40 #include "lib/skin.h"
  41 #include "lib/strutil.h"        /* str_term_width1() */
  42 #include "lib/widget.h"
  43
  44 /*** global variables ****************************************************************************/
  45
  46 /*** file scope macro definitions ****************************************************************/
  47
  48 /*** file scope type declarations ****************************************************************/
  49
  50 /*** file scope variables ************************************************************************/
  51
  52 /*** file scope functions ************************************************************************/
  53
  54 /* --------------------------------------------------------------------------------------------- */
  55 /*** public functions ****************************************************************************/
  56 /* --------------------------------------------------------------------------------------------- */
  57
  58 Listbox *
  59 create_listbox_window_centered (int center_y, int center_x, int lines, int cols,
  60                                 const char *title, const char *help)
  61 {
  62     const int space = 4;
  63
  64     int xpos = 0, ypos = 0;
  65     Listbox *listbox;
  66     widget_pos_flags_t pos_flags = WPOS_TRYUP;
  67
  68     /* Adjust sizes */
  69     lines = MIN (lines, LINES - 6);
  70
  71     if (title != NULL)
  72     {
  73         int len;
  74
  75         len = str_term_width1 (title) + 4;
  76         cols = MAX (cols, len);
  77     }
  78
  79     cols = MIN (cols, COLS - 6);
  80
  81     /* adjust position */
  82     if ((center_y < 0) || (center_x < 0))
  83         pos_flags |= WPOS_CENTER;
  84     else
  85     {
  86         /* Actually, this this is not used in MC. */
  87
  88         ypos = center_y;
  89         xpos = center_x;
  90
  91         ypos -= lines / 2;
  92         xpos -= cols / 2;
  93
  94         if (ypos + lines >= LINES)
  95             ypos = LINES - lines - space;
  96         if (ypos < 0)
  97             ypos = 0;
  98
  99         if (xpos + cols >= COLS)
 100             xpos = COLS - cols - space;
 101         if (xpos < 0)
 102             xpos = 0;
 103     }
 104
 105     listbox = g_new (Listbox, 1);
 106
 107     listbox->dlg =
 108         dlg_create (TRUE, ypos, xpos, lines + space, cols + space, pos_flags, FALSE, listbox_colors,
 109                     NULL, NULL, help, title);
 110
 111     listbox->list = listbox_new (2, 2, lines, cols, FALSE, NULL);
 112     group_add_widget (GROUP (listbox->dlg), listbox->list);
 113
 114     return listbox;
 115 }
 116
 117 /* --------------------------------------------------------------------------------------------- */
 118
 119 Listbox *
 120 create_listbox_window (int lines, int cols, const char *title, const char *help)
 121 {
 122     return create_listbox_window_centered (-1, -1, lines, cols, title, help);
 123 }
 124
 125 /* --------------------------------------------------------------------------------------------- */
 126
 127 /** Returns the number of the item selected */
 128 int
 129 run_listbox (Listbox * l)
 130 {
 131     int val = -1;
 132
 133     if (dlg_run (l->dlg) != B_CANCEL)
 134         val = l->list->pos;
 135     dlg_destroy (l->dlg);
 136     g_free (l);
 137     return val;
 138 }
 139
 140 /* --------------------------------------------------------------------------------------------- */
 141
 142 /**
 143  * A variant of run_listbox() which is more convenient to use when we
 144  * need to select arbitrary 'data'.
 145  *
 146  * @param select  the item to select initially, by its 'data'. Optional.
 147  * @return        the 'data' of the item selected, or NULL if none selected.
 148  */
 149 void *
 150 run_listbox_with_data (Listbox * l, const void *select)
 151 {
 152     void *val = NULL;
 153
 154     if (select != NULL)
 155         listbox_select_entry (l->list, listbox_search_data (l->list, select));
 156
 157     if (dlg_run (l->dlg) != B_CANCEL)
 158     {
 159         WLEntry *e;
 160         e = listbox_get_nth_item (l->list, l->list->pos);
 161         if (e != NULL)
 162         {
 163             /* The assert guards against returning a soon-to-be deallocated
 164              * pointer (as in listbox_add_item(..., TRUE)). */
 165             g_assert (!e->free_data);
 166             val = e->data;
 167         }
 168     }
 169
 170     dlg_destroy (l->dlg);
 171     g_free (l);
 172     return val;
 173 }
 174
 175 /* --------------------------------------------------------------------------------------------- */