Tkinter - One Canvas to Rule Them All?

[Dave Harris]

I derived two Frame classes and created a Canvas in each. I was extremely
surprised when frame1.canvas.delete('all') erased the image in
frame2.canvas!

I resolved my trouble by assigning tags and doing the deletion by tag. No
big deal.

I deduce from this behavior that there is a single database behind the
scenes for the Canvas implementation.

Just an observation. Maybe it will save somebody some head-scratching...

Dave Harris

 

[Peter Otten]

I derived two Frame classes and created a Canvas in each. I was extremely
surprised when frame1.canvas.delete('all') erased the image in
frame2.canvas!

Maybe you are accidentally deleting the last reference to the image (the
canvas itself doesn't keep one). Care to show some code?

I deduce from this behavior that there is a single database behind the
scenes for the Canvas implementation.

I can't confirm that.

Peter