[java-gnome-hackers] GTK, DisplayManager and multihead X

[Stefan P. <st...@pr...>]

Hi all,

I was experimenting with multiheaded display support for java-gnome.
For this purpose I wrote coverage for org.gnome.gdk.DisplayManager and
org.gnome.gdk.Display.

I ran into two problems. One may be missing understanding on the
java-gnome internals, the other may be X/GTK related.

1. When requesting a list of displays from the DisplayManager
   I got the message that there is no mapping for 'GdkDisplayX11'
   in the typeMapping.properties. So just for testing I changed
     GdkDisplay=org.gnome.gdk.Display
   to
     GdkDisplayX11=org.gnome.gdk.Display
   which seemed to work.
   What would be the correct way to add this mapping?

2. I have a dual headed workstation with Xinerama. GTK identifies
   this as 1 display with 1 screen ":0.1" (2560x1024).
   When I use the Java Swings GraphicsEnvironment/GraphicsConfiguration
   this is identified as 2 screens ":0.0" and ":0.1" (1280x1024).

   When testing to open applications on a specific screen, it looks
   like I really do have one screen when it comes to X.
   "xterm -display :0.0" works, "xterm -display :0.1" doesn't.

   I hoped I would get java-gnome to behave like Swing, which allows me
   (in my setup) to decide on which monitor a window shows up.
   Any idea what I can do? How can I tell X/GTK that I do have multiple
   screens on my display?

If you want to try it out, I attached a patch against the mainline and
an additional test program.

Regards,
  Stefan