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Re^4: Question about embedded Tk::Canvas

by emilbarton (Scribe)
on Nov 20, 2013 at 19:13 UTC ( #1063578=note: print w/replies, xml ) Need Help??

in reply to Re^3: Question about embedded Tk::Canvas
in thread Question about embedded Tk::Canvas

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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Re^5: Question about embedded Tk::Canvas
by kschwab (Priest) on Nov 20, 2013 at 19:31 UTC
    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 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();
      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.
        Looking at your code on github, it's because of this:
        my $canvas = $Mainwin->Scrolled('Canvas')->grid; my $real = $canvas->Subwidget("canvas");
        Based on your choice of the variable name $real, you seem to already know what the issue is here :) $canvas isn't a 'Canvas'.

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