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Hi, your code runs, and the problem is as you describe. However, I think your problem stems from trying to use the Form manager to place multiple canvases on top of another base canvas. I may be wrong, but this is what I was taught. Forming or packing a canvas, on top of another canvas, does not make it an item of the underlying canvas.

When you try to put another widget into another widget, as opposed to putting them in a container widget, like a frame or window, you need to use the createWindow method of the underlying Canvas. Here is a simple example.

By the way, what sort of things are you putting in your sub-canvases? Why can't you just use a small image, and bind to it for your mouse actions? Also, buttons can be given background images, with Tk::Compound

A second example following, shows how to hide createWindow items.

#!/usr/bin/perl use warnings; use strict; use Tk; use Tk::JPEG; use Image::Magick; my $im = Image::Magick->new; my $image = shift || 'zen16.jpg'; #roughly a 500x500 jpg my ($width, $height, $size, $format) = $im->Ping($image); my $mw = MainWindow->new(); $mw->fontCreate('big', -family=>'courier', -weight=>'bold', -size=>int(-18*18/14)); my $canv = $mw->Canvas( -bg => 'lightsteelblue', -relief => 'sunken', -width => $width, -height => $height)->pack(-expand => 1, -fill => 'both'); my $img = $mw->Photo(-file => $image ); $canv->createImage( 0, 0, -image => $img, -anchor => 'nw' ); my $text = $mw->Scrolled('Text', -bg=>'lightyellow', -scrollbars=>'osoe', ); my $textcontainer = $canv->createWindow( $width/2, $height/2, -window => $text, -width => $width -200, -height => $height-200, -state => 'normal'); my $button = $mw->Button( -bg=>'lightblue', -text=>'Push Me', -command=> sub{ $text->insert('end',time."\n")}, ); my $butcontainer = $canv->createWindow( 125, 25, -window => $button, -width => 125, -height => 25, -state => 'normal'); my $ctext = $canv->createText( 300,20, -font=>'big', -fill=> 'white', -text=>'la di da'); bunchOfBoxes(); $text->focus; MainLoop(); sub bunchOfBoxes { for(0..10){ my $window = $canv->Checkbutton(-text=> $_); $canv->createWindow(450, 20 + ($_ * 20), -window=> $window); } }

Showing hiding of a createWindow item

#!/usr/bin/perl use warnings; use strict; use Tk; use Tk::JPEG; use Tk::PNG; #demonstrates need for subwidget method #on Scrolled Canvas, to use lower or raise my $mw = new MainWindow; my $canvas = $mw->Scrolled('Canvas', -bg => 'white', -xscrollincrement => 1, -yscrollincrement => 1, -confine => 1, -scrollbars => 'se', -width => 200, -height => 200, -closeenough =>3, -scrollregion => [ 0, 0, 500, 500 ], )->pack(qw/ -fill both -expand 1 -side top/); my $realcanvas = $canvas->Subwidget('scrolled'); $mw->Button(-text=>"Raise Bunny", -command => sub{ # $canvas->lower( 'bunny' ,'tux' ); # will cause error # need subwidget of the scrolled canvas $realcanvas->raise( 'bunny' ,'background' ); })->pack(); $mw->Button(-text=>"Lower Bunny", -command => sub{ $realcanvas->lower( 'bunny' ,'background' ); })->pack(); my $rect = $canvas->createRectangle(0,0,500, 500, -fill => 'orange', -tags => ['background'], ); my $bunny = $mw->Photo(-data => get_bunny() ); $canvas->createImage( 40, 40, -image => $bunny, -anchor => 'nw', -tags => ['bunny'], ); my $window = $canvas->Checkbutton(-text=> 'Foo'); my $win = $canvas->createWindow(20,20, -window=> $window, ); $canvas->move($win,-1000,-1000); #dx, dy $mw->Button(-text=>"Show Checkbox", -command => sub{ $canvas->move($win, 1000,1000 ); })->pack(); $mw->Button(-text=>"Hide Checkbox", -command => sub{ $canvas->move($win, -1000,-1000 ); })->pack(); # $canvas->lower( 'bunny' ,'background' ); # will cause error # need subwidget $realcanvas->lower( 'bunny' ,'background' ); MainLoop; sub get_bunny{ return 'iVBORw0KGgoAAAANSUhEUgAAAB4AAAAjEAIAAABcJvHFAAAACXBIWXMAAAsSAAALEgHS3 +X78AAAD F0lEQVR42u1YL+yqUBj1vfcLbhY3C44is8BIREYSG9FoNBqNkok2aFhp2BhJDWyadCZN/i +lOGxan jRdOuRsPxl/f+23vJKfX7x6+73znu5dK5RviV9QPDMMwDIPP7/f7/X6XTWU0Go1Go06n0+ +l0PM/z PC91CNu2bduWZVmW5bLpjsfj8XgcBEEQBJPJZDKZZAw0n8/n8zkCGYZhGIYgCIIgFEt3OB +wOh8OA gKZpmqZlDDedTqfTKRnO933f95GVer1er9fz0BVFURRFxCR3QfyMQfv9fr/fDyLgOI7jON +mo419k JUkMBoPBYJCRNBrxdrvdbrco6qvVarVaIWdFpQO/5tIcFBbE4nQ6nU6nJIpHjlGlEklTFE +VRFDIa T32/3+/3+3jqHMdxHBcfB2sK6HFFURRFeb1er9crfksoNUrr0GvUfxGfnA+FmX+QALDItG +LDA6O2 pQyCJFkPqxMDK2p9LodOAhQaLRjfoKRGo2wObl3G8PoDsA0Gb5Q5oonjfSNKTh96AOh+u9 +1ut1uS FuZrONPJ7bJ06tA9TDDsD6QkCnDltEDRkV1Q9AnENyuk8hcyChkkcZKo5uv1er1er3S6cA +PkFXSx MQodPrXFg2zTEsVANhO2JNdEmVo80ub7K/lSDHPyLkNaXrVarVar2W46LMuyLFsKaZ7neZ +4nvwFR NGKeGjYajUajkXz9z+RLn8/n8/ms/ANIQXq5XC6Xy/v9fr/fvw3p9Xq9Xq9VVVVV9fF4PB +6Pokhc r9fr9Vr6s6Lf4dNpbS6/exQA3BHDt/fkPl3wwT85wlcEcrCHZyHO1tmOSl95iGLcQN80Td +M0jTa1 LMuyLF3XdV03TdM0zWaz2Ww2Xdd1XRenDlDHgTbtvj/ykMZpDm/6LpfL5XLBmGi32+12G6 +Th5RAA Pne73W63iwfGYFosFovF4kOZrtVqtVoN16TD4XA4HPAAKDp5yZUkSZIk1GGz2Ww2m91ut9 +vt0Mof lcfxeDwej7PZbDaboRFbrVar1SJfIsLdYZfn8/l8Pue3y1zyiH9VAMFElb5Yp/+PcvAbH/ +25ox5S PYYAAAAASUVORK5CYII='; }

I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

In reply to Re^3: Unbind canvas items and Forget by zentara
in thread Unbind canvas items and Forget by Phinix

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