FocusListener (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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java.awt.event
Interface FocusListener

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
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 abstract FocusAdapter class (overriding only the methods of interest). The listener object created from that class is then registered with a component using the component's addFocusListener method. When the component gains or loses the keyboard focus, the relevant method in the listener object is invoked, and the FocusEvent is passed to it.

Since:: 1.1
See Also:: FocusAdapter, FocusEvent, Tutorial: Writing a Focus Listener

Method Summary

void focusGained(FocusEvent e)
Invoked when a component gains the keyboard focus.

void focusLost(FocusEvent e)
Invoked when a component loses the keyboard focus.

Method Summary
`void`	`focusGained(FocusEvent e)` Invoked when a component gains the keyboard focus.
`void`	`focusLost(FocusEvent e)` Invoked when a component loses the keyboard focus.

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.