On Wed, 21 Mar 2001, Skip Montanaro wrote:
>
> How does one discover and/or keep track of the stacking order of
> GnomeCanvasItems? Based upon the methods I've discovered so far
> (raise_/lower & raise_to_top/lower_to_bottom), there's no way to do either
> of the following:
>
> * figure out the stacking order
>
> * raise or lower a group of items while maintaining their same relative
> relationship
>
> Here's an example. Suppose I have a canvas widget that contains a mix of
> ellipse, polygon and rect items. I want to raise or lower all of one type
> of item as a group and maintain the relative stacking order of all items of
> the same group. Let's suppose the stacking order is (bottom to top):
>
> r1, r2, e1, p1, r3, p2
>
> After I raise the polygons one level, I have
>
> r1, r2, e1, r3, p1, p2
>
> Now, if I raise the polygons again, I will either have
>
> r1, r2, e1, r3, p1, p2
>
> (if p1 was raised first) or
>
> r1, r2, e1, r3, p2, p1
>
> (if p2 was raised first)
>
> To prevent the second case from happening, I have to know the stacking order
> so I can first raise p1, then raise p2.
If you asked Federico, he would probably say you should have the two items
in a group if you always move them together. However, if you just want to
know the stacking order, you can use the group.children() method which
returns a list of children of a canvas group. That should do what you
want.
James.
--
Email: [EMAIL PROTECTED]
WWW: http://www.daa.com.au/~james/
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