# Copyright (c) 2009 bivio Software, Inc.  All Rights Reserved.
#
# Visit http://www.bivio.biz for more info.
# 
# This library is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of the
# License, or (at your option) any later version.
# 
# This library 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
# Lesser General Public License for more details.
# 
# You should have received a copy of the GNU Lesser General Public
# License along with this library;  If not, you may get a copy from:
# http://www.opensource.org/licenses/lgpl-license.html
# 
# $Id: ClearOnFocus.pm,v 1.4 2010/03/25 22:40:43 dobbs Exp $
package Bivio::UI::XHTML::Widget::ClearOnFocus;
use strict;
use Bivio::Base 'XHTMLWidget.Join';
use Bivio::UI::ViewLanguageAUTOLOAD;

our($VERSION) = sprintf('%d.%02d', q$Revision: 1.4 $ =~ /\d+/g);

sub initialize {
    my($self) = @_;
    my($id) = JavaScript()->unique_html_id;
    $self->put_unless_exists(values => [
	Script('b_clear_on_focus'),
	$self->get('widget')->put(
	    ONFOCUS => Join([
		'b_clear_on_focus(this, "',
		JavaScriptString($self->get('hint_text')),
		'")',
            ]),
	    class => _class($self),
	    id => $id,
	),
	Tag({
            tag => 'script',
	    TYPE => 'text/javascript',
	    value => Join([
		"var b_clear_on_focus_value = document.getElementById('$id');\n",
                "if (b_clear_on_focus_value && !b_clear_on_focus_value.value.length)\n",
                'b_clear_on_focus_value.value = "',
                JavaScriptString($self->get('hint_text')),
		qq{";\n},
	    ]),
	}),
    ]);
    return shift->SUPER::initialize(@_);
}

sub internal_new_args {
    return shift->internal_compute_new_args(
	[qw(widget hint_text)], \@_);
}

sub _class {
    my($self) = @_;
    my($c) = $self->get('widget')->unsafe_get('class');
    return !$c ? 'disabled' : Join([$c, 'disabled'], ' ');
}

1;