Re: [MacPerl-Toolbox] QuickDraw and MacWindows

["Quentin Smith" <macmania@bit-net.com>]

I think my mailer messed up, as those typos were not there. I can assure
you, with the modifications I made, it works fine. Here's a complete version
of the EasyWindow module with my modifications:

package Mac::EasyWindow;

use Mac::Windows;
use Mac::Events;
use Mac::QuickDraw;
use Mac::Fonts;
use strict;

BEGIN {
    use Exporter;
    use vars qw(@ISA @EXPORT);
    @ISA = qw(Exporter);
    @EXPORT = qw(&DRAWING &WINDOW &SHOW &DESTROY);
}

my %vars = ();
my $draw = '';
my $win = '';

sub DRAWING {
   my ($str) = @_;
   $draw = eval "sub { $str }";
}

sub WINDOW {
    my($data ) = @_;

    my $height = defined $data->{height} ? $data->{height} : 200;
    my $width  = defined $data->{width}  ? $data->{width}  : 200;
    my $x_pos = 16;
    my $y_pos = 52;
    my $title = 'EasyWindow';

    my $bnd = new Rect($x_pos, $y_pos, $width+$x_pos, $height+$y_pos);
    $win = new MacColorWindow $bnd, $title, 1, 4, 1;

    $win->sethook('drawgrowicon', sub {1} );
    $win->sethook('redraw', sub { &{ $draw } });

    $win->window;

}

sub SHOW { WaitNextEvent while $win->window }

sub DESTROY {$win->dispose if defined $win}

1;



Here's what my previous message said according to my mailer:
Hi-
I modified my copy of EasyWindow as Kevin Reid suggested. Here is what I
did:
In the subroutine DRAWING, change $draw = $str; into $draw = eval "sub
 $str }";
In the subroutine WINDOW, where the redraw hook is defined, change
val( $draw ) into &{ $draw }

--Quentin
----- Original Message -----
From: "Alan Fry" <ajf@afco.demon.co.uk>
To: "MacPerl Toolbox" <macperl-toolbox@macperl.org>
Sent: Tuesday, June 27, 2000 5:28 PM
Subject: Re: [MacPerl-Toolbox] QuickDraw and MacWindows


> At 9:47 am -0400 27/06/00, Quentin Smith wrote:
>
> >In the subroutine DRAWING, change $draw = $str; into $draw = eval "sub
> >  $str }";
> >In the subroutine WINDOW, where the redraw hook is defined, change
> >val( $draw ) into &{ $draw }
>
> That certainly doesn't work as set out, even with the obvious typos put
right.
>
> A slight modification does work however:
>
>      eval "sub draw {$str}";            # in EasyWindow::DRAWING
>      $win->sethook('redraw', \&draw);   # in EasyWindow::WINDOW
>
> I am lost for a test to demonstrate how much of an improvement it
> might be over the original. Presumably (?) the eval() is not now
> called in an 'update' event, but how important is that anyway? Anyone
> know?
>
> At 11:34 am -0400 27/06/00, Kevin Reid wrote:
>
> >sub DRAWING (&) {
> >   my ($sub) = @_;
> >   &$sub; # or save it for later
> >}
>
> This retrieves '$sub' as a CODE reference to the block of QuickDraw
> text -- yes?  On the face of it, it looks likely the reference could
> be used directly in the 'redraw' hook. However I have quite failed to
> find a way to make that work. I suspect '&$sub' behaves as the
> original text string, not a functioning sub-routine. At any rate
> "print &$sub" merely returns the original, unadorned text string.
>
> Alan Fry
>
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