java.awt
Class DefaultFocusTraversalPolicy
java.lang.Object
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 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
- Version:
- 1.3, 01/23/03
- Author:
- David Mendenhall
- See Also:
Container.getComponents()
,
Component.isFocusable()
,
Component.setFocusable(boolean)
,
Serialized Form
DefaultFocusTraversalPolicy
public DefaultFocusTraversalPolicy()