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Gtk+/Gnome Application Development
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Keyboard Focus

The focus field in GdkEventCrossing indicates whether the event window or one of its ancestors has the keyboard input focus. Keyboard focus is an X concept, used to determine which window should receive key events. The window manager decides which toplevel window has the focus (usually the focused window is highlighted and brought to the top; most window managers let you choose between "focus follows mouse" and "click to focus" modes). When an application has the focus, it is free to move it among its subwindows---perhaps different text entry fields. However, GTK+ does not use the X focus mechanism for subwindows. Toplevel GtkWindow widgets are the only ones which receive the X focus. Thus, they receive all raw key events from X (by way of GDK). GTK+ implements its own concept of widget focus, which is analagous to X's window focus, but in reality entirely distinct. When a toplevel GtkWindow widget receives key events, it forwards them to the widget with GTK+'s focus.

In short, this means the focus flag will be TRUE if the toplevel GtkWindow containing the event window currently has the X focus. The focus flag is unrelated to GTK+'s widget focus concept.

Gtk+/Gnome Application Development
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