Many thanks for that.
I have tried to use tags as you suggest by adding the same tag to a number of items
that I was going to use as a group.
I then set the following binds where $last_tag_global contained the tag I set on the items.
$wg{Layout_Canvas}->bind($last_tag_global, '<1>', sub {&mobileStart();
+});
$wg{Layout_Canvas}->bind($last_tag_global, '<B1-Motion>', sub {&mobile
+Move();});
$wg{Layout_Canvas}->bind($last_tag_global, '<ButtonRelease-1>', sub {&
+mobileStop();});

[download]
I then used the following subroutines (which I found on another Monks thread) to select the items that had the tag, ‘jump’
them onto the cursor and move them to the required position.
sub mobileStart {
      my $ev = $wg{Layout_Canvas}->XEvent;
      ($dx_cursor, $dy_cursor) = (0 - $ev->x, 0 - $ev->y);
      $wg{Layout_Canvas}->raise('current');
      print "START MOVE->  $dx_cursor  $dy_cursor\n";
}
sub mobileMove {
      my $ev = $wg{Layout_Canvas}->XEvent;
      $wg{Layout_Canvas}->move('current', $ev->x + $dx_cursor, $ev->y 
++$dy_cursor);
      ($dx_cursor, $dy_cursor) = (0 - $ev->x, 0 - $ev->y);
      print "MOVING->  $dx_cursor  $dy_cursor\n";
}
sub mobileStop{&mobileMove;}

[download]
This nearly worked except that it would only move one of the items at a time and only
when the cursor was exactly or nearly exactly over a section (for example a side of a rectangle drawn with canvasRectangle) of the item.
What do I have to do so that I can select all of the items that have a particular tag
(by placing the cursor somewhere in the 'middle' of the items that have the tag)
and move them together to where I want them to be?

In reply to Re^2: Canvas group members syntax by merrymonk
in thread Canvas group members syntax by merrymonk

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