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

How do unselect a canvas? ive tried: $canvas->selectClear;

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Re: canvas unselect
by zentara (Cardinal) on Dec 31, 2008 at 13:34 UTC
    What are you trying to clear? A Tk Canvas? Clear everything? If so, 
    $canvas->delete('all');  # all or the tag you want to delete

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    or are you trying to change focus. Be more specific.
    I'm not really a human, but I play one on earth Remember How Lucky You Are
[reply]
[d/l]
Re: canvas unselect
by Anonymous Monk on Dec 31, 2008 at 13:48 UTC
    Yes im trying to change the focus. I dont want to delete the contents of the canvas just allow one canvas at a time to be highlighted and selected.
[reply]
      Well you don't show any code, but here is something to play with. Tab around the widgets, or force focus to a canvas. Otherwise, show a minimal working code example, and say what you want it to do. 
      #!/usr/bin/perl
use strict;
use Tk;
use Tk::Pane;

my $mw = MainWindow->new;

$mw->geometry('400x250');

my $mwf = $mw->Scrolled('Pane', 
               -scrollbars=>'osoe', 
           -sticky=>'nwse',
           )->pack(-expand=>1, -fill=>'both');

my $f1 = $mwf->Frame()->pack();
my $f2 = $mwf->Frame()->pack();

my %canv;

for (0..4){
  $canv{$_}{'obj'} = $f1->Scrolled('Canvas',
            -height => 100,
            -width => 100,
            -bg =>'white',
        -scrollbars => 'osoe',
        -scrollregion => [ 0, 0, 500, 500 ], 
   )->pack(-side =>'left' ,-padx=>10,-pady=>10);

  $canv{$_}{'obj'}->createText(50,50,
    -text   => $_,
    -anchor => 'center',
    );

my $num = $_;
$canv{$num}{'obj'}->CanvasBind( '<FocusOut>' => sub{
           $canv{$num}{'obj'}->configure(-bg=>'lightyellow');
   } );

$canv{$num}{'obj'}->CanvasBind( '<FocusIn>' => sub{
           $canv{$num}{'obj'}->configure(-bg=>'lightgreen');
   } );
}

for (5..9){
  $canv{$_}{'obj'} = $f2->Scrolled('Canvas',
            -height => 100,
            -width => 100,
        -bg =>'white',
            -scrollbars => 'osoe',
        -scrollregion => [ 0, 0, 500, 500 ], 
   )->pack(-side =>'left', -padx=>10,-pady=>10 );

  $canv{$_}{'obj'}->createText(50,50,
    -text   => $_,
    -anchor => 'center',
    );

my $num = $_;
$canv{$num}{'obj'}->CanvasBind( '<FocusOut>' => sub{
           $canv{$num}{'obj'}->configure(-bg=>'lightyellow');
   } );

$canv{$num}{'obj'}->CanvasBind( '<FocusIn>' => sub{
           $canv{$num}{'obj'}->configure(-bg=>'lightgreen');
   } );
}


my $button = $mw->Button(-text=>'Focus 1',
   -command => sub{
       $canv{1}{'obj'}->focusForce;
       $canv{1}{'obj'}->configure(-bg=>'blue');
     
     })->pack();


MainLoop();

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      I'm not really a human, but I play one on earth Remember How Lucky You Are
[reply]
[d/l]
Re: canvas unselect
by boblawblah (Scribe) on Dec 31, 2008 at 16:45 UTC
    Whenever you make a post you should provide as many details as possible. Without the details in the question, we don't have enough information to give you a detailed response.

    I am assuming that you are using Tk? Keep in mind that there are other GUI toolkit's out there with their own canvas widgets.

    If you want to give focus to a widget - use the grab method: 
    
$canvas1->grab;
$canvas2->grab;

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[d/l]

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