lib/widget/label.c

   1 /*
   2    Widgets for the Midnight Commander
   3
   4    Copyright (C) 1994-2024
   5    Free Software Foundation, Inc.
   6
   7    Authors:
   8    Radek Doulik, 1994, 1995
   9    Miguel de Icaza, 1994, 1995
  10    Jakub Jelinek, 1995
  11    Andrej Borsenkow, 1996
  12    Norbert Warmuth, 1997
  13    Andrew Borodin <aborodin@vmail.ru>, 2009-2022
  14
  15    This file is part of the Midnight Commander.
  16
  17    The Midnight Commander is free software: you can redistribute it
  18    and/or modify it under the terms of the GNU General Public License as
  19    published by the Free Software Foundation, either version 3 of the License,
  20    or (at your option) any later version.
  21
  22    The Midnight Commander is distributed in the hope that it will be useful,
  23    but WITHOUT ANY WARRANTY; without even the implied warranty of
  24    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25    GNU General Public License for more details.
  26
  27    You should have received a copy of the GNU General Public License
  28    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  29  */
  30
  31 /** \file label.c
  32  *  \brief Source: WLabel widget
  33  */
  34
  35 #include <config.h>
  36
  37 #include <stdarg.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40
  41 #include "lib/global.h"
  42
  43 #include "lib/tty/tty.h"
  44 #include "lib/tty/color.h"
  45 #include "lib/skin.h"
  46 #include "lib/strutil.h"
  47 #include "lib/widget.h"
  48
  49 /*** global variables ****************************************************************************/
  50
  51 /*** file scope macro definitions ****************************************************************/
  52
  53 /*** file scope type declarations ****************************************************************/
  54
  55 /*** forward declarations (file scope functions) *************************************************/
  56
  57 /*** file scope variables ************************************************************************/
  58
  59 /* --------------------------------------------------------------------------------------------- */
  60 /*** file scope functions ************************************************************************/
  61 /* --------------------------------------------------------------------------------------------- */
  62
  63 static cb_ret_t
  64 label_callback (Widget *w, Widget *sender, widget_msg_t msg, int parm, void *data)
  65 {
  66     WLabel *l = LABEL (w);
  67
  68     switch (msg)
  69     {
  70     case MSG_DRAW:
  71         {
  72             char *p = l->text;
  73             int y = 0;
  74             gboolean disabled;
  75             align_crt_t align;
  76
  77             if (l->text == NULL)
  78                 return MSG_HANDLED;
  79
  80             disabled = widget_get_state (w, WST_DISABLED);
  81
  82             if (l->transparent)
  83                 tty_setcolor (disabled ? DISABLED_COLOR : DEFAULT_COLOR);
  84             else
  85             {
  86                 const int *colors;
  87
  88                 colors = widget_get_colors (w);
  89                 tty_setcolor (disabled ? DISABLED_COLOR : colors[DLG_COLOR_NORMAL]);
  90             }
  91
  92             align = (w->pos_flags & WPOS_CENTER_HORZ) != 0 ? J_CENTER_LEFT : J_LEFT;
  93
  94             while (TRUE)
  95             {
  96                 char *q;
  97                 char c = '\0';
  98
  99
 100                 q = strchr (p, '\n');
 101                 if (q != NULL)
 102                 {
 103                     c = q[0];
 104                     q[0] = '\0';
 105                 }
 106
 107                 widget_gotoyx (w, y, 0);
 108                 tty_print_string (str_fit_to_term (p, w->rect.cols, align));
 109
 110                 if (q == NULL)
 111                     break;
 112
 113                 q[0] = c;
 114                 p = q + 1;
 115                 y++;
 116             }
 117             return MSG_HANDLED;
 118         }
 119
 120     case MSG_DESTROY:
 121         g_free (l->text);
 122         return MSG_HANDLED;
 123
 124     default:
 125         return widget_default_callback (w, sender, msg, parm, data);
 126     }
 127 }
 128
 129 /* --------------------------------------------------------------------------------------------- */
 130 /*** public functions ****************************************************************************/
 131 /* --------------------------------------------------------------------------------------------- */
 132
 133 WLabel *
 134 label_new (int y, int x, const char *text)
 135 {
 136     WRect r = { y, x, 1, 1 };
 137     WLabel *l;
 138     Widget *w;
 139
 140     if (text != NULL)
 141         str_msg_term_size (text, &r.lines, &r.cols);
 142
 143     l = g_new (WLabel, 1);
 144     w = WIDGET (l);
 145     widget_init (w, &r, label_callback, NULL);
 146
 147     l->text = g_strdup (text);
 148     l->auto_adjust_cols = TRUE;
 149     l->transparent = FALSE;
 150
 151     return l;
 152 }
 153
 154 /* --------------------------------------------------------------------------------------------- */
 155
 156 void
 157 label_set_text (WLabel *label, const char *text)
 158 {
 159     Widget *w = WIDGET (label);
 160     int newcols = w->rect.cols;
 161     int newlines;
 162
 163     if (label->text != NULL && text != NULL && strcmp (label->text, text) == 0)
 164         return;                 /* Flickering is not nice */
 165
 166     g_free (label->text);
 167
 168     if (text == NULL)
 169         label->text = NULL;
 170     else
 171     {
 172         label->text = g_strdup (text);
 173         if (label->auto_adjust_cols)
 174         {
 175             str_msg_term_size (text, &newlines, &newcols);
 176             w->rect.cols = MAX (newcols, w->rect.cols);
 177             w->rect.lines = MAX (newlines, w->rect.lines);
 178         }
 179     }
 180
 181     widget_draw (w);
 182
 183     w->rect.cols = MIN (newcols, w->rect.cols);
 184 }
 185
 186 /* --------------------------------------------------------------------------------------------- */
 187
 188 void
 189 label_set_textv (WLabel *label, const char *format, ...)
 190 {
 191     va_list args;
 192     char buf[BUF_1K];           /* FIXME: is it enough? */
 193
 194     va_start (args, format);
 195     g_vsnprintf (buf, sizeof (buf), format, args);
 196     va_end (args);
 197
 198     label_set_text (label, buf);
 199 }
 200
 201 /* --------------------------------------------------------------------------------------------- */