in reply to Re^2: Question about embedded Tk::Canvas
in thread Question about embedded Tk::Canvas

Seems odd that it would turn into a Frame. I suspect the Canvas is just packed in that frame. Try $widget->children on the Frame, and I bet there's a Canvas there.
  • Comment on Re^3: Question about embedded Tk::Canvas

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Re^4: Question about embedded Tk::Canvas
by emilbarton (Scribe) on Nov 20, 2013 at 19:02 UTC
    Well I have 

     Tk::Canvas=HASH(0x3071f58) 
 Tk::Scrollbar=HASH(0x36db080)
 Tk::Frame=HASH(0x36db608)

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    but the canvas would rather be a child of the matrix. I check that.
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Re^4: Question about embedded Tk::Canvas
by emilbarton (Scribe) on Nov 20, 2013 at 19:13 UTC
    The ancestors from the main window are:

      $tracker_window =  MainWindow->new..
  $TrackBook = $tracker_window->NoteBook..
  $TrackTabs{'Tracks'} = $TrackBook..
  $Matrix = $TrackTabs{'Tracks'}->Scrolled..  
  $canvas = $Mainwin->Scrolled('Canvas')->grid..
  my $real = $canvas->Subwidget("canvas"); # for bindings..
  $CstObj->{'matrix'}->windowConfigure( "$i,1", -window => $canvas )..

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[d/l]
      Right. So your issue is retrieving a reference to the canvas object. The easiest approach would probably be to store a reference to it when you create it. You seem to be creating a module anyway...so perhaps something like: 
      package YourPackage;
use strict;use warnings;
use Tk;
use Tk::Canvas;
sub new {
   my $class = shift;
   my $self = bless {}, $class;
   my $mw = MainWindow->new();
   $self->{'mainwin'}=$mw;
   $self->{'mycanvas'}=$mw->Canvas();
   return $self;
}
sub getcanvas {
   my $self=shift;
   printf "Returning a %s\n",ref($self->{'mycanvas'});
   return $self->{'mycanvas'}
}
package main;
my $YP = YourPackage->new();
my $canvas=$YP->getcanvas();

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[d/l]
        Ok, it seems quite a bit of a modification on my script. I don't understand why retrieving a reference aftewards should disturb but I'll apply this solution.

        Thank you very much for your help.
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Re^4: Question about embedded Tk::Canvas
by emilbarton (Scribe) on Nov 20, 2013 at 19:17 UTC
    I have also a loop to destroy canvases in refresh, it might be faulty:

      for (my $n = 0; $n < $Maxobj; $n++ ){
    my $canvas =  $CstObj->{'matrix'}->windowDelete("$n,1");
  } ## should delete embedded widgets in canvas track too (I hope).

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