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# Create the screen for the editor.
my $screen = $cui->add(
	'screen', 'Window',
	-padtop          => 1, # leave space for the menu
	-border		 => 0,
	-ipad		 => 0,
);

# We add the editor widget to this screen.
my $editor = $screen->add(
	'editor', 'TextEditor',
	-border 	 => 1,
	-padtop		 => 0,	
	-padbottom 	 => 3,
	-showlines	 => 0,
	-sbborder	 => 0,
	-vscrollbar	 => 1,
	-hscrollbar	 => 1,
	-showhardreturns => 0,
	-wrapping        => 0, # wrapping slows down the editor :-(
	-text		 => $text,
);

# There is no need for the editor widget to loose focus, so
# the "loose-focus" binding is disabled here. This also enables the
# use of the "TAB" key in the editor, which is nice to have.
$editor->clear_binding('loose-focus');

# Help information for the user. 
$screen->add(
	'help', 'Label',
	-y 	 	 => -2,
	-width		 => -1,
	-reverse 	 => 1,
	-paddingspaces   => 1,
	-text 	 	 => 
	      " ^Q Quit from the program ^S save file"
	    . " ^W toggle wrapping\n"
	    . " ^X Open the menu         ^O open file"
	    . " ^R toggle hard returns viewing",
);

# ----------------------------------------------------------------------
# Callback routines
# ----------------------------------------------------------------------
	
sub open_dialog()
{
	my $file = $cui->loadfilebrowser( 
		-file         => $currentfile,
	);

	if (defined $file) 
	{
		if (open F, "<$file") {
		    my $text = "";
		    while (<F>) { $text .= $_ }
		    close F;
		    $editor->text($text);
		    $editor->cursor_to_home;
	 	    $currentfile = $file;
		} else { 
		    $cui->error(-message => "Can't read file \"$file\":\n$!");
		}
	}
}

sub save_dialog()
{

	my $file = $cui->savefilebrowser(
		-file         => $currentfile,
	);
	return unless defined $file;

	if (open F, ">$file") {
	    print F $editor->text;
	    if (close F) {
		$cui->dialog(-message => "File \"$file\"\nsuccessfully saved");
		$currentfile = $file;
	    } else {
		$cui->error(-message => "Error on closing file \"$file\":\n$!");
	    }
	} else {
	    $cui->error(-message => "Can't write to $file:\n$!");
	}
}

sub about_dialog()
{
	$cui->dialog(
		-title => 'About editor',
		-message => "Program : Curses::UI::POE Editor\n"
	 		  . "Author  : Maurice Makaay\n"
			  . "\n"
			  . "The sole purpose of this editor\n"
			  . "is the demonstration of my perl\n"
		 	  . "Curses::UI::POE widget set."
	);
}
		
sub exit_dialog()
{
	my $return = $cui->dialog(
			-title     => "Are you sure???", 
			-buttons   => ['yes', 'no'],
			-message => "Do you really want to quit?"
	);

	exit(0) if $return;
}


# ----------------------------------------------------------------------
# The main loop of the program
# ----------------------------------------------------------------------


$cui->set_binding(\&exit_dialog, "\cQ", "\cC");
$cui->set_binding(\&save_dialog, "\cS");