Serializable
public class DefaultFocusTraversalPolicy extends ContainerOrderFocusTraversalPolicy
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.
Please see How to Use the Focus Subsystem, a section in The Java Tutorial, and the Focus Specification for more information.
Constructor | Description |
---|---|
DefaultFocusTraversalPolicy() |
Constructs a DefaultFocusTraversalPolicy . |
getComponentAfter, getComponentBefore, getDefaultComponent, getFirstComponent, getImplicitDownCycleTraversal, getLastComponent, setImplicitDownCycleTraversal
getInitialComponent
public DefaultFocusTraversalPolicy()
DefaultFocusTraversalPolicy
.protected boolean accept(Component aComponent)
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.accept
in class ContainerOrderFocusTraversalPolicy
aComponent
- the Component whose fitness as a focus owner is to be testedtrue
if aComponent meets the above requirements; false
otherwise
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/DefaultFocusTraversalPolicy.html