kis_canvas and widgets

[Michael Thaler]

Hello,

I was thinking about improving the crop tool a little bit. Actually it would 
be very nice to add handles like in gimp to resize the area to crop. The 
easiest way would probably be to paint a widget on the kis_canvas. Now I have 
to questions;

- is there a function to get a pointer to the kis_canvas that can be used as a 
parent widget for my widget?

- is it at all possible to paint regions of a widget transparent? I thought 
about drawing lines and handles, but the background of the widget must of 
course be transparent, so that you see the actual image.

Some hints how to do this would be really nice,
Greetings,
Michael