Re: Is it possible to stop a signal callback?

[Emmanuele Bassi]

On Mon, 2007-08-06 at 10:00 +0800, Ye Wenbin wrote:
> On Mon, 06 Aug 2007 01:35:41 +0800, zentara <[EMAIL PROTECTED]> wrote:
> 
> > Have you looked at
> > http://forgeftp.novell.com/gtk2-perl-study/download/
> > it will answer alot of questions.
> >
> I have read this document. It is really helpful.
> >
> > Don't use while(1) or sleep in a gui script, they cause malfunctions.
> 
> I did not use sleep to do some work periodly. I was trying to show the  
> signal
> callback will take a long time to finish. Maybe it need fork or using  
> thread. But
> the problem is I don't know how to communicate with subprocess. I will try
> to find it.

you should look at the Gtk2-Perl FAQ:

  http://live.gnome.org/GTK2-Perl/FrequentlyAskedQuestions

especially the 'How do I keep my GUI updating while doing a long file
read?' question.

ciao,
 Emmanuele.

-- 
Emmanuele Bassi,
W: http://www.emmanuelebassi.net
B: http://log.emmanuelebassi.net

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Re: Is it possible to stop a signal callback?

[Ye Wenbin]

On Mon, 06 Aug 2007 01:35:41 +0800, zentara <[EMAIL PROTECTED]> wrote:

> Have you looked at
> http://forgeftp.novell.com/gtk2-perl-study/download/
> it will answer alot of questions.
>
I have read this document. It is really helpful.
>
> Don't use while(1) or sleep in a gui script, they cause malfunctions.

I did not use sleep to do some work periodly. I was trying to show the  
signal
callback will take a long time to finish. Maybe it need fork or using  
thread. But
the problem is I don't know how to communicate with subprocess. I will try
to find it.

-- 
Best regards,
Ye Wenbin
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Re: Is it possible to stop a signal callback?

[zentara]

On Sun, 05 Aug 2007 23:35:24 +0800
"Ye Wenbin" <[EMAIL PROTECTED]> wrote:

>Hi,
>In my application, there is a callback which may take a long time to  
>finish.
>Is it possible to return from the callback when user really need? For  
>example,
>code as following, can I press the button 'cancel' to stop the counting?
>Is there any document about thread in Gtk2?

Have you looked at 
http://forgeftp.novell.com/gtk2-perl-study/download/ 
it will answer alot of questions.


>$but = Gtk2::Button->new('start');
>$but->signal_connect(
> 'clicked' => sub {
> my $i = 0;

Don't use while(1) or sleep in a gui script, they cause malfunctions.
> while ($i < 10) {
> sleep( 1 );
> $i++;
> print "I'm working\n";
> }
> return FALSE;
> }
>);

Try this:
#!/usr/bin/perl
use warnings;
use strict;
use Gtk2 '-init';
use Glib qw(TRUE FALSE);

my $cancel = 0;

my $window = Gtk2::Window->new('toplevel');
$window->signal_connect('delete_event' => sub { Gtk2->main_quit; });

my $hbox= Gtk2::HBox->new(FALSE, 0);
my $but;
$but = Gtk2::Button->new('start');

$but->signal_connect(
 'clicked' => sub {
 my $i = 0;
# while ($i < 1000) {
## sleep( 1 );
# $i++;
# print "I'm working $i\n";
   
my $id = Glib::Timeout->add (1000, sub{
$i++;
if($i > 1000){print "done\n";$cancel = 0; return FALSE;}
if($cancel==1){print "done\n";$cancel = 0; return FALSE;}
print "I'm working $i\n";

}); 

 #}
 
 return FALSE;
 }
);
$hbox->pack_start($but, TRUE, TRUE, 5);

$but = Gtk2::Button->new('Cancel');
$but->signal_connect(
 'clicked' => sub {
 $cancel = 1;
 warn "Stop it\n";
 }
);

$hbox->pack_start($but, TRUE, TRUE, 5);
$window->add($hbox);
$window->show_all();
Gtk2->main;
__END__

zentara

-- 
I'm not really a human, but I play one on earth.
http://zentara.net/japh.html
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Is it possible to stop a signal callback?

[Ye Wenbin]

Hi,
In my application, there is a callback which may take a long time to  
finish.
Is it possible to return from the callback when user really need? For  
example,
code as following, can I press the button 'cancel' to stop the counting?
Is there any document about thread in Gtk2?

use Gtk2 '-init';
use Glib qw(TRUE FALSE);
my $window = Gtk2::Window->new('toplevel');
$window->signal_connect('delete_event' => sub { Gtk2->main_quit; });

my $hbox= Gtk2::HBox->new(FALSE, 0);
my $but;
$but = Gtk2::Button->new('start');
$but->signal_connect(
 'clicked' => sub {
 my $i = 0;
 while ($i < 10) {
 sleep( 1 );
 $i++;
 print "I'm working\n";
 }
 return FALSE;
 }
);
$hbox->pack_start($but, TRUE, TRUE, 5);
$but = Gtk2::Button->new('Cancel');
$but->signal_connect(
 'clicked' => sub {
 die "Stop it\n";
 }
);
$hbox->pack_start($but, TRUE, TRUE, 5);
$window->add($hbox);
$window->show_all();
Gtk2->main;


-- 
Best regards,
Ye Wenbin
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