libs/gtkmm2ext/grouped_buttons.cc

   1 /*
   2     Copyright (C) 2001 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18     $Id$
  19 */
  20
  21 #include <gtkmm.h>
  22
  23 #include <gtkmm2ext/grouped_buttons.h>
  24
  25 using namespace std;
  26
  27 GroupedButtons::GroupedButtons (vector<Gtk::ToggleButton *>& buttonset)
  28 {
  29         uint32_t n = 0;
  30
  31         buttons = buttonset;
  32
  33         for (vector<Gtk::ToggleButton *>::iterator i = buttons.begin(); i != buttons.end(); ++i, ++n) {
  34                 if ((*i)->get_active()) {
  35                         current_active = n;
  36                 }
  37                 (*i)->signal_clicked().connect (sigc::bind (mem_fun (*this, &GroupedButtons::one_clicked), n));
  38         }
  39 }
  40
  41 GroupedButtons::GroupedButtons (uint32_t nbuttons, uint32_t first_active)
  42 {
  43         buttons.reserve (nbuttons);
  44         current_active = first_active;
  45
  46         for (uint32_t n = 0; n < nbuttons; ++n) {
  47
  48                 Gtk::ToggleButton *button;
  49
  50                 button = manage (new (Gtk::ToggleButton));
  51
  52                 if (n == current_active) {
  53                         button->set_active (true);
  54                 }
  55
  56                 button->signal_clicked().connect (sigc::bind (mem_fun (*this, &GroupedButtons::one_clicked), n));
  57                 buttons.push_back (button);
  58         }
  59 }
  60
  61 static gint
  62 reactivate_button (void *arg)
  63 {
  64         Gtk::ToggleButton *b = (Gtk::ToggleButton *) arg;
  65         b->set_active (true);
  66         return FALSE;
  67 }
  68
  69 void
  70 GroupedButtons::one_clicked (uint32_t which)
  71 {
  72         if (buttons[which]->get_active()) {
  73
  74                 if (which != current_active) {
  75                         uint32_t old = current_active;
  76                         current_active = which;
  77                         buttons[old]->set_active (false);
  78                 }
  79
  80         } else if (which == current_active) {
  81
  82                 /* Someobody tried to unset the current active
  83                    button by clicking on it. This caused
  84                    set_active (false) to be called. We don't
  85                    allow that, so just reactivate it.
  86
  87                    Don't try this right here, because of some
  88                    design glitches with GTK+ toggle buttons.
  89                    Setting the button back to active from
  90                    within the signal emission that marked
  91                    it as inactive causes a segfault ...
  92                 */
  93
  94                 g_idle_add (reactivate_button, buttons[which]);
  95         }
  96 }