Re: rounded rectangles problem

On Wed, Aug 10, 2005 at 13:56:18 -0400, James Muir wrote:
Hi All,

I'm trying to subclass Gnome2::Canvas::Shape to get a rounded rectangle. 
No success yet. I need to set the Bpath for the shape. As far as I can 
tell the pathdef can not be set up in INIT_INSTANCE as this is too soon 
and the properties have not been passed in. I'm not sure if it's OK to 

So set it up in SET_PROPERTY. Whenever some of the properties affecting the
shape is set, look whether all the others are defined, and if they are, set
the shape. SET_PROPERY /is/ called for default values if not explicitly
specified, so you can be sure all the properties will be set before the
object is shown.

instantiate a pathdef inside my RoundedRect or not, and I'm not sure how 
to call set_path_def. I've seen in the Mup::ColorButton example that an 
event is used to set the button color for the first time. I tried 
something similar but without success.

The problem is, that Gnome2::Canvas::Shape is NOT a Gtk2::Widget, so it does
not have realize nor map signals. The SET_PROPERTY approach should be better
and has the added benefit that the shape is reset when the properties are
changed later.

I think the code you have shown is mostly ok. Just place the shape generation

You can also look in the code for GnomeCanvasRect and GnomeCanvasRE (if you
know C) how they do it. In fact, you may even be able to derive from
GnomeCanvasRE, depending on how it is implemented.

                                                 Jan 'Bulb' Hudec <bulb ucw cz>

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