Re: gnome panel 2 background

[Alex Larsson <alexl redhat com>]

On 6 Jan 2002, Chris Phelps wrote:

> While working on making my PanelMenu applet blend with the background of
> it's parent panel, I came across a pretty undesirable set of
> circumstances. With the current scheme, the change_background signal
> only sends the filename of the background pixmap. That means that each
> applet has to do it's own position calculating, and then properly render
> the background image when needed (tiled, stretched, etc). The main
> problem here is when the applet is moved on the parent panel...there is
> no signal emitted, so there is not way for the applet to know that it
> should re-render it's background.
> 
> My current thought is for the panel to save a pixmap of it's background
> as rendered on screen (the whole size of the panel). The child applet
> could then simply get it's coordinates and copy the section that it will
> be covering.
> 
> So the question is, does anyone have a more robust scheme to deal with
> this? (keep in mind that we will probably be needing to support
> transparent panels and the like)

The idea is to have a Pixmap of the current background, and send the xid 
of the pixmap and the offsets in it to the applet when the background 
changes.

I have some extensive changes to PanelWidget planned which will change all 
this and make it work more like normal Gtk+ widgets.

/ Alex