package MTools::Comp::MFocuser;
#	This program is free software; you can redistribute it and/or
#	modify it under the terms of the GNU LGPL Libray 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 Library General Public License for more details.
#
#	You should have received a copy of the GNU Library General Public License
#	along with this program; if not, write to the Free Software
#	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA,
#	or refer to http://www.gnu.org/copyleft/lgpl.html
#
##################################################################

# L'objet MFocuser permet de gerer le focus entre plusieurs objets
#
# Parametres : 
#	* @targets : objets entre lesquels est gere le focus
# Fonctions : 
#	* add : permet de prendre en compte un nouvel objet 
#	* setFocused : force le focus sur un objet

use strict;
use MTools;

use vars qw /@ISA/;

BEGIN 
{
	@ISA = qw /MTools::MObjet/;
}

use Tk;

sub new {
	my ($class, @targets) = @_;
	my $self = new MTools::MObjet ();
	bless $self, $class;
	
	$self -> recordProperty (focused => undef);
	$self -> recordEvent ('GET_FOCUS');
	$self -> recordEvent ('SET_FOCUS');
	if (defined @targets)
	{
		$self -> {__targets} = \@targets;
	}
	for (my $i; $i < @targets; $i++)
	{
		$targets [$i] -> binding ('GET_FOCUS', ['setFocused', $self]);
	}
	
	$self -> binding ('SET_FOCUS', ['setFocused', $self]);
	
	return $self;
}

sub add {
	my ($self, $tg) = @_;
	push (@{$self -> {__targets}}, $tg);
	$tg -> binding ('GET_FOCUS', ['setFocused', $self]);
}

sub remove {
	my ($self, $tg) = @_;
	if (!defined $self -> {__targets}) {return;}
	my @tgs = @{$self -> {__targets}};
	for (my $i = 0; $i < @tgs; $i++)
	{
		if ($tgs [$i] == $tg) {
			splice (@{$self -> {__targets}}, $i, 1);
			return;
		}
	}
}

sub setFocused {
	my ($self, $tg) = @_;
	$self -> mconfigure (focused => $tg);
	if (!defined $self -> {__targets}) {return;}
	my @tgs = @{$self -> {__targets}};
	my $from_children = 0;
	for (my $i = 0; $i < @tgs; $i++)
	{
		if ($tgs [$i] ne $tg)
		{
			$tgs [$i] -> notify ('SET_FOCUS');
		}
		else
		{
			$from_children = 1;
		}
	}
	if ($from_children)
	{
		$self -> notify ('GET_FOCUS', $self);
	}
}

1;