EventListener
AWTEventMulticaster
, BasicToolBarUI.FrameListener
, JMenu.WinListener
, WindowAdapter
public interface WindowFocusListener extends EventListener
WindowEvents
, including WINDOW_GAINED_FOCUS
and WINDOW_LOST_FOCUS
events. The class that is interested in processing a WindowEvent
either implements this interface (and all the methods it contains) or extends the abstract WindowAdapter
class (overriding only the methods of interest). The listener object created from that class is then registered with a Window
using the Window
's addWindowFocusListener
method. When the Window
's status changes by virtue of it being opened, closed, activated, deactivated, iconified, or deiconified, or by focus being transferred into or out of the Window
, the relevant method in the listener object is invoked, and the WindowEvent
is passed to it.Modifier and Type | Method | Description |
---|---|---|
void |
windowGainedFocus |
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. |
void |
windowLostFocus |
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)
e
- the event to be processedvoid windowLostFocus(WindowEvent e)
e
- the event to be processed
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/event/WindowFocusListener.html