java.awt.event
Interface FocusListener
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- All Superinterfaces:
- EventListener
- All Known Implementing Classes:
- AWTEventMulticaster, BasicButtonListener, BasicComboBoxEditor, BasicComboBoxEditor.UIResource, BasicComboBoxUI.FocusHandler, BasicListUI.FocusHandler, BasicSliderUI.FocusHandler, BasicSplitPaneUI.FocusHandler, BasicTabbedPaneUI.FocusHandler, BasicTableUI.FocusHandler, BasicTextUI.BasicCaret, BasicToolBarUI.ToolBarFocusListener, BasicTreeUI.FocusHandler, Component.AccessibleAWTComponent.AccessibleAWTFocusHandler, DefaultCaret, FocusAdapter, JComponent.AccessibleJComponent.AccessibleFocusHandler, MetalComboBoxEditor, MetalComboBoxEditor.UIResource
public interface FocusListener extends EventListener
The listener interface for receiving keyboard focus events on a component. The class that is interested in processing a focus event either implements this interface (and all the methods it contains) or extends the abstractFocusAdapterclass (overriding only the methods of interest). The listener object created from that class is then registered with a component using the component'saddFocusListenermethod. When the component gains or loses the keyboard focus, the relevant method in the listener object is invoked, and theFocusEventis passed to it.- Since:
- 1.1
- See Also:
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FocusAdapter,FocusEvent, Tutorial: Writing a Focus Listener
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description voidfocusGained(FocusEvent e)Invoked when a component gains the keyboard focus.voidfocusLost(FocusEvent e)Invoked when a component loses the keyboard focus.
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Method Detail
focusGained
void focusGained(FocusEvent e)
Invoked when a component gains the keyboard focus.
focusLost
void focusLost(FocusEvent e)
Invoked when a component loses the keyboard focus.
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