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Re: Question about embedded Tk::Canvas

by kschwab (Priest)
on Nov 20, 2013 at 16:56 UTC ( #1063556=note: print w/replies, xml ) Need Help??

in reply to Question about embedded Tk::Canvas

Are you sure $canvas is actually a "Canvas"? Can you add print ref($canvas) . "\n"; and see what it prints out?

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Re^2: Question about embedded Tk::Canvas
by emilbarton (Scribe) on Nov 20, 2013 at 18:52 UTC
    This is the problem actually, my $canvas turned to a Tk::Frame in the process. In the simpler script with the same lines of code, even with

     $canvas =  $Matrix->windowCget("$tracknumber,1" , '-window')

    it remains a Canvas object.

     bless $canvas, "Tk::Canvas"

    doesn't help.
      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.
        Well I have

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

        but the canvas would rather be a child of the matrix. I check that.
        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 )..
        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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