DefaultFocusTraversalPolicy (Java 2 Platform SE 5.0) (original) (raw)

java.lang.Object extended by java.awt.FocusTraversalPolicy java.awt.ContainerOrderFocusTraversalPolicy java.awt.DefaultFocusTraversalPolicy

All Implemented Interfaces:

Serializable

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 byContainer.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() orComponent.isFocusable(), or by callingComponent.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.

Please see How to Use the Focus Subsystem, a section in The Java Tutorial, and theFocus Specification for more information.

Since:

1.4

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](../../java/awt/ContainerOrderFocusTraversalPolicy.html#getComponentAfter%28java.awt.Container, java.awt.Component%29), [getComponentBefore](../../java/awt/ContainerOrderFocusTraversalPolicy.html#getComponentBefore%28java.awt.Container, java.awt.Component%29), 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](../../java/lang/Object.html#wait%28long, int%29)

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 overridingComponent.isFocusTraversable() orComponent.isFocusable(), or by callingComponent.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](../../java/awt/ContainerOrderFocusTraversalPolicy.html#accept%28java.awt.Component%29) in class [ContainerOrderFocusTraversalPolicy](../../java/awt/ContainerOrderFocusTraversalPolicy.html "class in java.awt")

Parameters:

aComponent - the Component whose fitness as a focus owner is to be tested

Returns:

true if aComponent meets the above requirements;false otherwise

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.