java.awt.event

Interface FocusListener

All Superinterfaces:
EventListener
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, MotifButtonListener, MotifTextUI.MotifCaret, NumberFieldErrorListener, PasswordEditor, TextAreaEditor, TextAreaTableCellEditor.EditorDelegate, WindowsButtonListener, WindowsComboBoxUI.WindowsComboBoxEditor

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 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, Reference: The Java Class Libraries (update file)

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 Details

focusGained

public void focusGained(FocusEvent e)
Invoked when a component gains the keyboard focus.
Usages and Demos :

View More Examples of focusGained(FocusEvent e)
   1: import java.awt.event.FocusEvent;
   2: import java.awt.event.FocusListener;
   3: import java.awt.event.KeyEvent;
   4:         ...
   5: 
   6:   FocusListener focusListener;
   7: 
   8:         ...
   9:         case FocusEvent.FOCUS_GAINED:
  10:           focusListener.focusGained(evt);
  11:           break;

View Full Code Here
   1: import jp.ujihara.java.awt.event.FocusEvent;
   2: import jp.ujihara.java.awt.event.FocusListener;
   3: import jp.ujihara.java.awt.peer.MenuComponentPeer;
   4:         ...
   5: 
   6:   private transient FocusListener focusListener;
   7: 
   8:         ...
   9:             case FocusEvent.FOCUS_GAINED:
  10:               focusListener.focusGained((FocusEvent) event);
  11:               break;

View Full Code Here
   1: import jp.ujihara.java.awt.event.FocusEvent;
   2: import jp.ujihara.java.awt.event.FocusListener;
   3: import jp.ujihara.java.awt.event.HierarchyBoundsListener;
   4:         ...
   5: 
   6:   transient FocusListener focusListener;
   7: 
   8:         ...
   9:         case FocusEvent.FOCUS_GAINED:
  10:           focusListener.focusGained(e);
  11:         break;

View Full Code Here

focusLost

public void focusLost(FocusEvent e)
Invoked when a component loses the keyboard focus.
Usages and Demos :

View More Examples of focusLost(FocusEvent e)
   1: import java.awt.event.FocusEvent;
   2: import java.awt.event.FocusListener;
   3: import java.awt.event.KeyEvent;
   4:         ...
   5: 
   6:   FocusListener focusListener;
   7: 
   8:         ...
   9:         case FocusEvent.FOCUS_LOST:
  10:           focusListener.focusLost(evt);
  11:           break;

View Full Code Here
   1: import jp.ujihara.java.awt.event.FocusEvent;
   2: import jp.ujihara.java.awt.event.FocusListener;
   3: import jp.ujihara.java.awt.peer.MenuComponentPeer;
   4:         ...
   5: 
   6:   private transient FocusListener focusListener;
   7: 
   8:         ...
   9:             case FocusEvent.FOCUS_LOST:
  10:               focusListener.focusLost((FocusEvent) event);
  11:               break;

View Full Code Here
   1: import jp.ujihara.java.awt.event.FocusEvent;
   2: import jp.ujihara.java.awt.event.FocusListener;
   3: import jp.ujihara.java.awt.event.HierarchyBoundsListener;
   4:         ...
   5: 
   6:   transient FocusListener focusListener;
   7: 
   8:         ...
   9:         case FocusEvent.FOCUS_LOST:
  10:           focusListener.focusLost(e);
  11:         break;

View Full Code Here