grouped_buttons.cc

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/*
    Copyright (C) 2001 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id$
*/

#include <gtkmm.h>

#include <gtkmm2ext/grouped_buttons.h>

using namespace std;

GroupedButtons::GroupedButtons (vector<Gtk::ToggleButton *>& buttonset)
{
        uint32_t n = 0;

        buttons = buttonset;

        for (vector<Gtk::ToggleButton *>::iterator i = buttons.begin(); i != buttons.end(); ++i, ++n) {
                if ((*i)->get_active()) {
                        current_active = n;
                }
                (*i)->signal_clicked().connect (sigc::bind (mem_fun (*this, &GroupedButtons::one_clicked), n));
        }
}

GroupedButtons::GroupedButtons (uint32_t nbuttons, uint32_t first_active)
{
        buttons.reserve (nbuttons);
        current_active = first_active;

        for (uint32_t n = 0; n < nbuttons; ++n) {

                Gtk::ToggleButton *button;
                
                button = manage (new (Gtk::ToggleButton));
                
                if (n == current_active) {
                        button->set_active (true);
                } 

                button->signal_clicked().connect (sigc::bind (mem_fun (*this, &GroupedButtons::one_clicked), n));
                buttons.push_back (button);
        }
}

static gint
reactivate_button (void *arg)
{
        Gtk::ToggleButton *b = (Gtk::ToggleButton *) arg;
        b->set_active (true);
        return FALSE;
}

void
GroupedButtons::one_clicked (uint32_t which)
{
        if (buttons[which]->get_active()) {

                if (which != current_active) {
                        uint32_t old = current_active;
                        current_active = which;
                        buttons[old]->set_active (false);
                }

        } else if (which == current_active) {

                /* Someobody tried to unset the current active
                   button by clicking on it. This caused
                   set_active (false) to be called. We don't
                   allow that, so just reactivate it.

                   Don't try this right here, because of some
                   design glitches with GTK+ toggle buttons.
                   Setting the button back to active from
                   within the signal emission that marked
                   it as inactive causes a segfault ...
                */

                g_idle_add (reactivate_button, buttons[which]);
        }
}