# Copyright 2012, 2013 Kevin Ryde
# This file is part of Math-Image.
#
# Math-Image 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 3, or (at your option) any later
# version.
#
# Math-Image 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 Math-Image. If not, see <http://www.gnu.org/licenses/>.
package App::MathImage::Gtk1::Ex::ComboBits;
use 5.004;
use strict;
use Carp;
use vars '$VERSION', '@ISA', '@EXPORT_OK';
$VERSION = 110;
use Exporter;
@ISA = ('Exporter');
@EXPORT_OK = qw(mouse_wheel);
# uncomment this to run the ### lines
#use Smart::Comments;
#------------------------------------------------------------------------------
my @button_to_incr;
$button_to_incr[4] = -1;
$button_to_incr[5] = 1;
sub mouse_wheel {
my ($combo) = @_;
my $entry = $combo->entry;
$entry->signal_connect (button_press_event => \&_do_mouse_wheel);
}
sub _do_mouse_wheel {
my ($entry, $event) = @_;
### Combo _do_mouse_wheel(): $event
my $combo = $entry->parent;
if ((my $incr = $button_to_incr[$event->{'button'}])
&& (my $list = $combo->list)
&& (my $entry = $combo->entry)) {
my ($item) = $list->selection;
if ($item) {
my $pos = $list->child_position($item);
### $pos
$pos += $incr;
if ($pos >= 0) {
$list->select_item($pos);
}
}
}
return 0; # EVENT_PROPAGATE
}
1;
__END__