Serializable
DefaultFocusTraversalPolicy
public class ContainerOrderFocusTraversalPolicy extends FocusTraversalPolicy implements Serializable
Container.getComponents()
. Portions of the hierarchy that are not visible and displayable will not be searched. By default, ContainerOrderFocusTraversalPolicy implicitly transfers focus down-cycle. That is, during normal forward focus traversal, the Component traversed after a focus cycle root will be the focus-cycle-root's default Component to focus. This behavior can be disabled using the setImplicitDownCycleTraversal
method.
By default, methods of this class will return a Component only if it is visible, displayable, enabled, and focusable. Subclasses can modify this behavior by overriding the accept
method.
This policy takes into account focus traversal policy providers. When searching for first/last/next/previous Component, if a focus traversal policy provider is encountered, its focus traversal policy is used to perform the search operation.
Constructor | Description |
---|---|
ContainerOrderFocusTraversalPolicy() |
Constructs a ContainerOrderFocusTraversalPolicy . |
Modifier and Type | Method | Description |
---|---|---|
protected boolean |
accept |
Determines whether a Component is an acceptable choice as the new focus owner. |
Component |
getComponentAfter |
Returns the Component that should receive the focus after aComponent. |
Component |
getComponentBefore |
Returns the Component that should receive the focus before aComponent. |
Component |
getDefaultComponent |
Returns the default Component to focus. |
Component |
getFirstComponent |
Returns the first Component in the traversal cycle. |
boolean |
getImplicitDownCycleTraversal() |
Returns whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitly. |
Component |
getLastComponent |
Returns the last Component in the traversal cycle. |
void |
setImplicitDownCycleTraversal |
Sets whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitly. |
getInitialComponent
public ContainerOrderFocusTraversalPolicy()
ContainerOrderFocusTraversalPolicy
.public Component getComponentAfter(Container aContainer, Component aComponent)
By default, ContainerOrderFocusTraversalPolicy implicitly transfers focus down-cycle. That is, during normal forward focus traversal, the Component traversed after a focus cycle root will be the focus-cycle- root's default Component to focus. This behavior can be disabled using the setImplicitDownCycleTraversal
method.
If aContainer is focus traversal policy provider, the focus is always transferred down-cycle.
getComponentAfter
in class FocusTraversalPolicy
aContainer
- a focus cycle root of aComponent or a focus traversal policy provideraComponent
- a (possibly indirect) child of aContainer, or aContainer itselfIllegalArgumentException
- if aContainer is not a focus cycle root of aComponent or focus traversal policy provider, or if either aContainer or aComponent is nullpublic Component getComponentBefore(Container aContainer, Component aComponent)
getComponentBefore
in class FocusTraversalPolicy
aContainer
- a focus cycle root of aComponent or focus traversal policy provideraComponent
- a (possibly indirect) child of aContainer, or aContainer itselfIllegalArgumentException
- if aContainer is not a focus cycle root of aComponent or focus traversal policy provider, or if either aContainer or aComponent is nullpublic Component getFirstComponent(Container aContainer)
getFirstComponent
in class FocusTraversalPolicy
aContainer
- the focus cycle root or focus traversal policy provider whose first Component is to be returnedIllegalArgumentException
- if aContainer is nullpublic Component getLastComponent(Container aContainer)
getLastComponent
in class FocusTraversalPolicy
aContainer
- the focus cycle root or focus traversal policy provider whose last Component is to be returnedIllegalArgumentException
- if aContainer is nullpublic Component getDefaultComponent(Container aContainer)
getFirstComponent
.getDefaultComponent
in class FocusTraversalPolicy
aContainer
- the focus cycle root or focus traversal policy provider whose default Component is to be returnedIllegalArgumentException
- if aContainer is nullpublic void setImplicitDownCycleTraversal(boolean implicitDownCycleTraversal)
true
, during normal forward focus traversal, the Component traversed after a focus cycle root will be the focus-cycle-root's default Component to focus. If false
, the next Component in the focus traversal cycle rooted at the specified focus cycle root will be traversed instead. The default value for this property is true
.implicitDownCycleTraversal
- whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitlypublic boolean getImplicitDownCycleTraversal()
true
, during normal forward focus traversal, the Component traversed after a focus cycle root will be the focus-cycle-root's default Component to focus. If false
, the next Component in the focus traversal cycle rooted at the specified focus cycle root will be traversed instead.protected boolean accept(Component aComponent)
aComponent
- the Component whose fitness as a focus owner is to be testedtrue
if aComponent is visible, displayable, enabled, and focusable; false
otherwise
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/ContainerOrderFocusTraversalPolicy.html