Re: Background images in window

[Peter Krueger <pkrueger appss de>]

On Mon, 12 Apr 2004, Chris wrote:
> I'm new to this list, so please forgive me if I'm asking the wrong
> questions! I was wondering how I can make an image in a window a background
> image, so that I can superimpose another widget on top of it. I have an
> image that I want to use in a splash screen and I want to put a progress bar
> on top of it to make it look like it's doing something constructive.  I've
> got the image rendered in a window, but I can't figure out how to add the
> progress bar.
Hello Chris!
I never tried something like this myself, but I can image two approaches:
1) Use the theming engine: Set a RCstyle for your splash-screen-widget
where you change the bg_pixmap property (See
http://developer.gnome.org/doc/API/2.0/gtk/gtk-Resource-Files.html)
2) If the first solution doesn't work you may try a more intrusive
approach: Create a GtkTable like this:

  0         1
0 -----------
  |         |
1 -----------
  |         |
2 -----------

Then put your background image in (0,0)x(1,2) so that it fills the
complete space. Put the progress bar in (0,1)x(1,2) to fill the lower
line. Both widgets are then drawn on top of each other. To make this work
it is important in which order you add the widgets to the table, so if you
can't see the progress bar try to change the order of adding them to the
table.
I don't know whether this (still) works, I only read about something like
this some time ago. You should try do use the first approach anyway.

> I'm also having problems using g_timeout_add so that I can destroy the
> splash screen after x-seconds. It appears to refresh the widget rather than
> destroy it i.e. every x seconds I will see it flicker.
Hmmm, first you have to add the timeout function:

gtk_timeout_add(2000, (GtkFunction)CbTimeout, pWidget);

This will call CbTimeout() after 2 seconds. In the timeout function close
the window:

gboolean CbTimeout(
  GtkWidget *pWidget)
{
  // close the window
  gtk_widget_hide(pWidget);

  // remove this function so that it won't be called again after next
  // timeout
  return FALSE;
}

To make this work your gtk_main() must already be running.

Regards,
                             Peter
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