public interface WindowFocusListener extends EventListener
WINDOW_LOST_FOCUSevents. The class that is interested in processing a
WindowEventeither implements this interface (and all the methods it contains) or extends the abstract
WindowAdapterclass (overriding only the methods of interest). The listener object created from that class is then registered with a
addWindowFocusListenermethod. When the
Window's status changes by virtue of it being opened, closed, activated, deactivated, iconified, or deiconified, or by focus being transfered into or out of the
Window, the relevant method in the listener object is invoked, and the
WindowEventis passed to it.
WindowEvent, Tutorial: Writing a Window Listener
|Modifier and Type||Method and Description|
Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.
Invoked when the Window is no longer the focused Window, which means that keyboard events will no longer be delivered to the Window or any of its subcomponents.
void windowGainedFocus(WindowEvent e)
void windowLostFocus(WindowEvent e)
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