lakshmananindia has asked for the wisdom of the Perl Monks concerning the following question:

Hi all,

I am in the process of writing a program which alerts the user when a Mail is received by an IMAP server. I alert the user by displaying a Dialog box.

But what happens is, the program is getting blocked until, the user presses the ok buttoon

But I want to continue my program, even if the user didn't give input. I searched in perlmonks and I got posts regarding to use the splash screen

I've tried the following sample program 

#!/usr/bin/perl -w
use strict;
use Tk;
my $mw = tkinit;
$mw->withdraw();
my $i=0;
my $k=0;
while (1) {

        my $notification = $mw->Toplevel();
        $notification->geometry("+$i+$k");
        $i+=10;
        $k+=5;
        $notification->protocol('WM_DELETE_WINDOW' => sub { $notificat
+ion->withdraw;  });
        $notification->Label(
            -text       => 'Your message displayed here.',
            -height     => 5
        )->pack;
        $notification->withdraw;              
        $notification->deiconify;
        $notification->raise;
        $notification->update();
        $mw->after(5000);
}

[download]

The code works. It display a new window in the given geomentry

Now If I click the close button in any one of the splash screen, I want to close only that splash screen

Can someone suggest how to do that??

I also wanted to know, is there any ways to make the dialog box to non-blocking??

--Lakshmanan G.

The great pleasure in my life is doing what people say you cannot do.

Replies are listed 'Best First'.
Re: Non blocking a Dialog box in Perl Tk
by thundergnat (Deacon) on Apr 23, 2010 at 16:35 UTC

    Dialog (and the derived DialogBox) does a non configurable global grab in its Show method so no, other than sub-classing and using a substitute Show method, you can't make Dialog non-blocking.

    However, it would be trivial to write your own version of a non-blocking "Dialog" pop up window. Something like this should give you a starting point.

    #!/usr/bin/perl
use warnings;
use strict;
use Tk;
my $mw = tkinit;
$mw->update;
my $number;

notify( $mw, "Notification Window #" . ++$number, 4000 );
$mw->repeat( 5000,
    sub { notify( $mw, "Notification Window #" . ++$number, 4000 ) } )
+;

MainLoop;

sub notify {
    my ( $mw, $message, $ms ) = @_;
    my $notification = $mw->Toplevel();
    $notification->transient($mw);
    $notification->overrideredirect(1);
    $notification->Popup( -popanchor => 'c' );
    my $frame = $notification->Frame( -border => 5, -relief => 'groove
+' )->pack;
    $frame->Label( -text => $message, )->pack( -padx => 5 );
    $frame->Button(
        -text    => 'OK',
        -command => sub { $notification->destroy; undef $notification 
+},
    )->pack( -pady => 5 );
    $notification->after( $ms, sub { $notification->destroy } );
}

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