understanding gdk_keyboard_grab behaviour

["Dinesh Nadarajah" <dxn1972 hotmail com>]

Hi:

I am trying to use the gdk_grab_keyboard function to grab the keyboard and 
simulate key events for the system. I wrote a skeleton application to test 
the behavior and scope of the grab. I have written similar applcation in 
Xlib.

The basic thing the program does is open a top level window and give it the 
keypressed signal handling capability. then the application, upon, expose 
grabs the key pressed. All future key pressed events must reach the 
keypressed signal handler (I thought). Here is what happens.

1. If I use

gdk_keyboard_grab(app->window,TRUE,GDK_CURRENT_TIME);

the keyboard is grabbed and all events are sent to it. Event when the focus 
is on other windows. BUT when I minimize the window or switch to another 
virtual desktop the keybaord grab is lost. I have found this not to be the 
case with Xlib.

2. If I use

		gdk_keyboard_grab(GDK_ROOT_WINDOW(),
                                 TRUE,
                                 GDK_CURRENT_TIME);

I get an error. what excatly does GDK_ROOT_WINDOW() return: an XWindow 
object or a GDK_WINDOW object?

3. finally when I use the XGrabKeyboard function (from Xlib), the keybaord 
is grabbed but no application responds to it. This grab is

	XGrabKeyboard(GDK_DISPLAY(), root_window, False,
              GrabModeAsync, GrabModeAsync, CurrentTime);

This same function works in an Xlib app.

what is going on here? ANy insight/knowledge would be greatly appreciated.

Thanks in advance.

-D




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