java.awt
Class DefaultFocusTraversalPolicy

java.lang.Object
  extended byjava.awt.FocusTraversalPolicy
      extended byjava.awt.ContainerOrderFocusTraversalPolicy
          extended byjava.awt.DefaultFocusTraversalPolicy
All Implemented Interfaces:
Serializable
Direct Known Subclasses:
SwingDefaultFocusTraversalPolicy

public class DefaultFocusTraversalPolicy
extends ContainerOrderFocusTraversalPolicy

A FocusTraversalPolicy that determines traversal order based on the order of child Components in a Container. From a particular focus cycle root, the policy makes a pre-order traversal of the Component hierarchy, and traverses a Container's children according to the ordering of the array returned by Container.getComponents(). Portions of the hierarchy that are not visible and displayable will not be searched.

If client code has explicitly set the focusability of a Component by either overriding Component.isFocusTraversable() or Component.isFocusable(), or by calling Component.setFocusable(), then a DefaultFocusTraversalPolicy behaves exactly like a ContainerOrderFocusTraversalPolicy. If, however, the Component is relying on default focusability, then a DefaultFocusTraversalPolicy will reject all Components with non-focusable peers. This is the default FocusTraversalPolicy for all AWT Containers.

The focusability of a peer is implementation-dependent. Sun recommends that all implementations for a particular native platform construct peers with the same focusability. The recommendations for Windows and Unix are that Canvases, Labels, Panels, Scrollbars, ScrollPanes, Windows, and lightweight Components have non-focusable peers, and all other Components have focusable peers. These recommendations are used in the Sun AWT implementations. Note that the focusability of a Component's peer is different from, and does not impact, the focusability of the Component itself.

Since:
1.4
Author:
David Mendenhall
See Also:
Container.getComponents(), Component.isFocusable(), Component.setFocusable(boolean), Serialized Form

Nested Class Summary
 
Nested classes inherited from class java.awt.ContainerOrderFocusTraversalPolicy
 
Field Summary
 
Fields inherited from class java.awt.ContainerOrderFocusTraversalPolicy
 
Constructor Summary
DefaultFocusTraversalPolicy()
           
 
Method Summary
protected  boolean accept(Component aComponent)
          Determines whether a Component is an acceptable choice as the new focus owner.
 
Methods inherited from class java.awt.ContainerOrderFocusTraversalPolicy
getComponentAfter, getComponentBefore, getDefaultComponent, getFirstComponent, getImplicitDownCycleTraversal, getLastComponent, setImplicitDownCycleTraversal
 
Methods inherited from class java.awt.FocusTraversalPolicy
getInitialComponent
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DefaultFocusTraversalPolicy

public DefaultFocusTraversalPolicy()
Method Detail

accept

protected boolean accept(Component aComponent)
Determines whether a Component is an acceptable choice as the new focus owner. The Component must be visible, displayable, and enabled to be accepted. If client code has explicitly set the focusability of the Component by either overriding Component.isFocusTraversable() or Component.isFocusable(), or by calling Component.setFocusable(), then the Component will be accepted if and only if it is focusable. If, however, the Component is relying on default focusability, then all Canvases, Labels, Panels, Scrollbars, ScrollPanes, Windows, and lightweight Components will be rejected.

Overrides:
accept in class ContainerOrderFocusTraversalPolicy
Parameters:
aComponent - the Component whose fitness as a focus owner is to be tested
Returns:
true if aComponent meets the above requirements; false otherwise