Class DefaultFocusTraversalPolicy
- All Implemented Interfaces:
Serializable
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.
- Since:
- 1.4
- See Also:
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Constructor Summary
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Method Summary
Methods inherited from class java.awt.ContainerOrderFocusTraversalPolicy
getComponentAfter, getComponentBefore, getDefaultComponent, getFirstComponent, getImplicitDownCycleTraversal, getLastComponent, setImplicitDownCycleTraversal
Methods inherited from class java.awt.FocusTraversalPolicy
getInitialComponent
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Constructor Details
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DefaultFocusTraversalPolicy
public DefaultFocusTraversalPolicy()Constructs aDefaultFocusTraversalPolicy
.
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Method Details
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accept
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
in classContainerOrderFocusTraversalPolicy
- Parameters:
aComponent
- the Component whose fitness as a focus owner is to be tested- Returns:
true
if aComponent meets the above requirements;false
otherwise
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