Allow custom controls to define their own client rect

[parduz]

Request

Add a way (using a virtual overridable function?) to change the client origin and size passed to child sizers from a custom container control

Description

I've built a custom control derived from the wxPanel, call it FancyPanel.
It draws and animate a border on mouseover and mouse down/up (technically i draw a rounded rectangle as big as the FancyPanel itself, with variable penwidth and radius of the rounded corners).

Other wxControls will be added at runtime as children of the FancyPanels, but i have no way to tell that the client size is smaller than the control size, so they end up being placed over the animated border.

According to Doublemax on the forum, there's no way to customize the client rect which will be passed to the sizers, and i think this is important for control customization.

-edit- sorry for typo in the title :(

[vadz]

We have wxWindow::GetClientAreaOrigin() but it might only actually be taken into account for top-level windows. The simplest way to do the same thing for a wxPanel is to just put a nested wxPanel inside it and I'm not sure it's really worth doing anything else.

But maybe GetClientAreaOrigin() does work. And if it doesn't, I guess we could accept patches making it work for arbitrary windows. However I don't have any plans to work on this myself.