widget reuse

Just curious, why reuse widget is not works:

    my $spacer = Gtk2::Label->new();
    $spacer->set_size_request(30,0);

    $hbox->pack_start($spacer,FALSE,FALSE,0);
    $hbox->pack_start($vbbox,FALSE,FALSE,0);
    $hbox->pack_start($spacer,FALSE,FALSE,0);

error:

Gtk-CRITICAL **: file gtktable.c: line 598
(gtk_table_attach): assertion 
`child->parent == NULL' failed at

TIA

-- 

--beast

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On Dec 31, 2005, at 12:36 AM, Beast wrote:

> Just curious, why reuse widget is not works:
>
>    my $spacer = Gtk2::Label->new();
>    $spacer->set_size_request(30,0);
>
>    $hbox->pack_start($spacer,FALSE,FALSE,0);
>    $hbox->pack_start($vbbox,FALSE,FALSE,0);
>    $hbox->pack_start($spacer,FALSE,FALSE,0);
>
> error:
>
> Gtk-CRITICAL **: file gtktable.c: line 598
(gtk_table_attach):  
> assertion `child->parent == NULL' failed at

Widgets can have only one parent.

Creating an empty label set to 30 pixels wide to separate
elements in  
an HBox is completely unnecessary, however, as you can
specify  
padding (that's the last parameter to pack()) and spacing
between  
children (e.g., $hbox->set_spacing(30)).


--
That's it!  It's one thing for a ghost to scare my children,
but it's  
another to play my theremin!
   - Homer Simpson

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