rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 96 insertions, 0 deletions

diff --git a/libs/gtkmm2ext/grouped_buttons.cc b/libs/gtkmm2ext/grouped_buttons.cc
new file mode 100644
index 0000000000..b16b983d02
--- /dev/null
+++ b/libs/gtkmm2ext/grouped_buttons.cc
@@ -0,0 +1,96 @@
+/*
+    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 ...
+		*/
+
+		gtk_idle_add (reactivate_button, buttons[which]);
+	}
+}