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    <p>I'm assuming you control both windows, and this is on an X11 system like Linux. If not, it's much more challenging. I've done things like this within a single app, and here are some recollections.</p> <p>You've probably figured out you can't just use <a href="http://library.gnome.org/devel/gtk/stable/GtkWidget.html#gtk-widget-grab-focus" rel="nofollow">gtk_widget_grab_focus()</a> to do it. That only works for determining which widget within a window has focus when the window itself has focus.</p> <p>It's X11 that determines which window gets a keyboard event, based on the window hierarchy, info from the window manager, etc. However, you can monkey around with that via GDK to get the result you want.</p> <p>You'll have to learn about <a href="http://library.gnome.org/devel/gdk/stable/gdk-Events.html" rel="nofollow">GDK event propagation</a>, and probably read some of the GDK sources. But I believe that, generally, what you'll need to do is this:</p> <ol> <li>Use gdk_event_handler_set() to install your own event handler. You'll need to do this after GTK+ is initialized, and chain to gtk_main_do_event().</li> <li>When you get a keyboard event (GdkEventKey), look at the X event structure. If it has the XID for window A, replace that with the XID for window B, and pass it on to GTK+. You might need to duplicate the event, and not modify the original one.</li> </ol> <p>If the windows belong to different apps, you can look at gdk_event_send_client_message(), but I've never used it.</p>
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    1. POGtk: send focus to a toplevel window without losing the first toplevel window
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    1. USBob Murphy
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    1. COIn fact I already have done the step 1, but what I really miss, is how can I compare two GdkWindow, I can't use the pointers for that. And not always this GdkWindow is the toplevel, sometimes it is another window, I even tried to use g_object_set_data to add a name to the window, but as I cited, this window isn't always the toplevel. How can I always get the toplevel and how can I get the XID for the GdkWindow ? Great thanks for your answer.
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    2. COI've found gdk_window_get_toplevel and GDK_WINDOW_XID, I'll take a look if it works !
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