lib/widget/button.c

   1 /*
   2    Widgets for the Midnight Commander
   3
   4    Copyright (C) 1994-2016
   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, 2010, 2013, 2016
  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 button.c
  32  *  \brief Source: WButton widget
  33  */
  34
  35 #include <config.h>
  36
  37 #include <stdlib.h>
  38
  39 #include "lib/global.h"
  40
  41 #include "lib/tty/tty.h"
  42 #include "lib/strutil.h"
  43 #include "lib/widget.h"
  44
  45 /*** global variables ****************************************************************************/
  46
  47 /*** file scope macro definitions ****************************************************************/
  48
  49 /*** file scope type declarations ****************************************************************/
  50
  51 /*** file scope variables ************************************************************************/
  52
  53 /*** file scope functions ************************************************************************/
  54
  55 static cb_ret_t
  56 button_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data)
  57 {
  58     WButton *b = BUTTON (w);
  59     WDialog *h = w->owner;
  60     int off = 0;
  61
  62     switch (msg)
  63     {
  64     case MSG_HOTKEY:
  65         /*
  66          * Don't let the default button steal Enter from the current
  67          * button.  This is a workaround for the flawed event model
  68          * when hotkeys are sent to all widgets before the key is
  69          * handled by the current widget.
  70          */
  71         if (parm == '\n' && WIDGET (h->current->data) == WIDGET (b))
  72         {
  73             send_message (w, sender, MSG_KEY, ' ', data);
  74             return MSG_HANDLED;
  75         }
  76
  77         if (parm == '\n' && b->flags == DEFPUSH_BUTTON)
  78         {
  79             send_message (w, sender, MSG_KEY, ' ', data);
  80             return MSG_HANDLED;
  81         }
  82
  83         if (b->text.hotkey != NULL && g_ascii_tolower ((gchar) b->text.hotkey[0]) == parm)
  84         {
  85             send_message (w, sender, MSG_KEY, ' ', data);
  86             return MSG_HANDLED;
  87         }
  88         return MSG_NOT_HANDLED;
  89
  90     case MSG_KEY:
  91         if (parm != ' ' && parm != '\n')
  92             return MSG_NOT_HANDLED;
  93
  94         h->ret_value = b->action;
  95         if (b->callback == NULL || b->callback (b, b->action) != 0)
  96             dlg_stop (h);
  97
  98         return MSG_HANDLED;
  99
 100     case MSG_CURSOR:
 101         switch (b->flags)
 102         {
 103         case DEFPUSH_BUTTON:
 104             off = 3;
 105             break;
 106         case NORMAL_BUTTON:
 107             off = 2;
 108             break;
 109         case NARROW_BUTTON:
 110             off = 1;
 111             break;
 112         case HIDDEN_BUTTON:
 113         default:
 114             off = 0;
 115             break;
 116         }
 117         widget_move (w, 0, b->hotpos + off);
 118         return MSG_HANDLED;
 119
 120     case MSG_UNFOCUS:
 121     case MSG_FOCUS:
 122     case MSG_DRAW:
 123         if (msg == MSG_UNFOCUS)
 124             b->selected = FALSE;
 125         else if (msg == MSG_FOCUS)
 126             b->selected = TRUE;
 127
 128         widget_selectcolor (w, b->selected, FALSE);
 129         widget_move (w, 0, 0);
 130
 131         switch (b->flags)
 132         {
 133         case DEFPUSH_BUTTON:
 134             tty_print_string ("[< ");
 135             break;
 136         case NORMAL_BUTTON:
 137             tty_print_string ("[ ");
 138             break;
 139         case NARROW_BUTTON:
 140             tty_print_string ("[");
 141             break;
 142         case HIDDEN_BUTTON:
 143         default:
 144             return MSG_HANDLED;
 145         }
 146
 147         hotkey_draw (w, b->text, b->selected);
 148
 149         switch (b->flags)
 150         {
 151         case DEFPUSH_BUTTON:
 152             tty_print_string (" >]");
 153             break;
 154         case NORMAL_BUTTON:
 155             tty_print_string (" ]");
 156             break;
 157         case NARROW_BUTTON:
 158             tty_print_string ("]");
 159             break;
 160         default:
 161             break;
 162         }
 163         return MSG_HANDLED;
 164
 165     case MSG_DESTROY:
 166         release_hotkey (b->text);
 167         return MSG_HANDLED;
 168
 169     default:
 170         return widget_default_callback (w, sender, msg, parm, data);
 171     }
 172 }
 173
 174 /* --------------------------------------------------------------------------------------------- */
 175
 176 static void
 177 button_mouse_callback (Widget * w, mouse_msg_t msg, mouse_event_t * event)
 178 {
 179     (void) event;
 180
 181     switch (msg)
 182     {
 183     case MSG_MOUSE_DOWN:
 184         dlg_select_widget (w);
 185         break;
 186
 187     case MSG_MOUSE_CLICK:
 188         send_message (w, NULL, MSG_KEY, ' ', NULL);
 189         send_message (w->owner, w, MSG_POST_KEY, ' ', NULL);
 190         break;
 191
 192     default:
 193         break;
 194     }
 195 }
 196
 197 /* --------------------------------------------------------------------------------------------- */
 198 /*** public functions ****************************************************************************/
 199 /* --------------------------------------------------------------------------------------------- */
 200
 201 WButton *
 202 button_new (int y, int x, int action, button_flags_t flags, const char *text, bcback_fn callback)
 203 {
 204     WButton *b;
 205     Widget *w;
 206
 207     b = g_new (WButton, 1);
 208     w = WIDGET (b);
 209
 210     b->action = action;
 211     b->flags = flags;
 212     b->text = parse_hotkey (text);
 213     widget_init (w, y, x, 1, button_get_len (b), button_callback, button_mouse_callback);
 214     b->selected = FALSE;
 215     b->callback = callback;
 216     widget_want_cursor (w, TRUE);
 217     widget_want_hotkey (w, TRUE);
 218     b->hotpos = (b->text.hotkey != NULL) ? str_term_width1 (b->text.start) : -1;
 219
 220     return b;
 221 }
 222
 223 /* --------------------------------------------------------------------------------------------- */
 224
 225 char *
 226 button_get_text (const WButton * b)
 227 {
 228     if (b->text.hotkey != NULL)
 229         return g_strconcat (b->text.start, "&", b->text.hotkey, b->text.end, (char *) NULL);
 230     return g_strdup (b->text.start);
 231 }
 232
 233 /* --------------------------------------------------------------------------------------------- */
 234
 235 void
 236 button_set_text (WButton * b, const char *text)
 237 {
 238     Widget *w = WIDGET (b);
 239
 240     release_hotkey (b->text);
 241     b->text = parse_hotkey (text);
 242     b->hotpos = (b->text.hotkey != NULL) ? str_term_width1 (b->text.start) : -1;
 243     w->cols = button_get_len (b);
 244     widget_redraw (w);
 245 }
 246
 247 /* --------------------------------------------------------------------------------------------- */
 248
 249 int
 250 button_get_len (const WButton * b)
 251 {
 252     int ret = hotkey_width (b->text);
 253
 254     switch (b->flags)
 255     {
 256     case DEFPUSH_BUTTON:
 257         ret += 6;
 258         break;
 259     case NORMAL_BUTTON:
 260         ret += 4;
 261         break;
 262     case NARROW_BUTTON:
 263         ret += 2;
 264         break;
 265     case HIDDEN_BUTTON:
 266     default:
 267         return 0;
 268     }
 269
 270     return ret;
 271 }
 272
 273 /* --------------------------------------------------------------------------------------------- */