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java.awt
Class ContainerOrderFocusTraversalPolicy
java.lang.Object
java.awt.FocusTraversalPolicy
java.awt.ContainerOrderFocusTraversalPolicy
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All Implemented Interfaces:
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Serializable
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Direct Known Subclasses:
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DefaultFocusTraversalPolicy
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public class
ContainerOrderFocusTraversalPolicy
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extends
FocusTraversalPolicy
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implements
Serializable
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.
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 with 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.
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Since:
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1.4
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See Also:
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Container.getComponents()
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Serialized Form
Methods inherited from class java.lang.
Object
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clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
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ContainerOrderFocusTraversalPolicy
public ContainerOrderFocusTraversalPolicy()
getComponentAfter
public ComponentgetComponentAfter(Container aContainer,
focusCycleRoot,
Component aComponent)
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Returns the Component that should receive the focus after aComponent.
aContainer
focusCycleRoot
must be a focus cycle root of
aComponent or a focus traversal policy provider.
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.
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Specified by:
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getComponentAfter
in class
FocusTraversalPolicy
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Parameters:
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aContainer
focusCycleRoot
- a focus cycle root of aComponent
or a focus traversal policy provider
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aComponent - a (possibly indirect) child of
aContainer,
focusCycleRoot,
or
aContainer
focusCycleRoot
itself -
Returns:
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the Component that should receive the focus after aComponent, or null if no suitable Component can be found
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Throws:
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IllegalArgumentException
- if
aContainer
focusCycleRoot
is not a focus cycle root of
aComponent
aComponent,
or
focus traversal policy provider, or
if either
aContainer
focusCycleRoot
or aComponent is null
getComponentBefore
public ComponentgetComponentBefore(Container aContainer,
focusCycleRoot,
Component aComponent)
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Returns the Component that should receive the focus before aComponent.
aContainer
focusCycleRoot
must be a focus cycle root of
aComponent or a
focus traversal policy provider
.
aComponent.
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Specified by:
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getComponentBefore
in class
FocusTraversalPolicy
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Parameters:
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aContainer
focusCycleRoot
- a focus cycle root of aComponent
or focus traversal policy provider
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aComponent - a (possibly indirect) child of
aContainer,
focusCycleRoot,
or
aContainer
focusCycleRoot
itself -
Returns:
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the Component that should receive the focus before aComponent, or null if no suitable Component can be found
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Throws:
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IllegalArgumentException
- if
aContainer
focusCycleRoot
is not a focus cycle root of
aComponent
aComponent,
or
focus traversal policy provider, or
if either
aContainer
focusCycleRoot
or aComponent is null
getFirstComponent
public ComponentgetFirstComponent(Container aContainer) focusCycleRoot)
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Returns the first Component in the traversal cycle. This method is used to determine the next Component to focus when traversal wraps in the forward direction.
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Specified by:
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getFirstComponent
in class
FocusTraversalPolicy
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Parameters:
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aContainer
focusCycleRoot
- the focus cycle root
or focus traversal policy provider
whose first Component is to be returned -
Returns:
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the first Component in the traversal cycle
of aContainer,
when focusCycleRoot is the focus cycle root,
or null if no suitable Component can be found -
Throws:
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IllegalArgumentException
- if
aContainer
focusCycleRoot
is null
getLastComponent
public ComponentgetLastComponent(Container aContainer) focusCycleRoot)
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Returns the last Component in the traversal cycle. This method is used to determine the next Component to focus when traversal wraps in the reverse direction.
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Specified by:
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getLastComponent
in class
FocusTraversalPolicy
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Parameters:
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aContainer
focusCycleRoot
- the focus cycle root
or focus traversal policy provider
whose last Component is to be returned -
Returns:
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the last Component in the traversal cycle
of aContainer,
when focusCycleRoot is the focus cycle root,
or null if no suitable Component can be found -
Throws:
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IllegalArgumentException
- if
aContainer
focusCycleRoot
is null
getDefaultComponent
public ComponentgetDefaultComponent(Container aContainer) focusCycleRoot)
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Returns the default Component to focus. This Component will be the first to receive focus when traversing down into a new focus traversal cycle rooted at
aContainer.
focusCycleRoot.
The default implementation of this method returns the same Component as getFirstComponent.
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Specified by:
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getDefaultComponent
in class
FocusTraversalPolicy
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Parameters:
-
aContainer
focusCycleRoot
- the focus cycle root
or focus traversal policy provider
whose default Component is to be returned -
Returns:
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the default Component in the traversal cycle
of aContainer,
when focusCycleRoot is the focus cycle root,
or null if no suitable Component can be found -
Throws:
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IllegalArgumentException
- if
aContainer
focusCycleRoot
is null -
See Also:
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getFirstComponent(java.awt.Container)
setImplicitDownCycleTraversal
public void setImplicitDownCycleTraversal(boolean implicitDownCycleTraversal)
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Sets whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitly. If 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.
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Parameters:
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implicitDownCycleTraversal - whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitly
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See Also:
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getImplicitDownCycleTraversal()
,
getFirstComponent(java.awt.Container)
getImplicitDownCycleTraversal
public boolean getImplicitDownCycleTraversal()
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Returns whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitly. If 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.
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Returns:
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whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitly
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See Also:
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setImplicitDownCycleTraversal(boolean)
,
getFirstComponent(java.awt.Container)
accept
protected boolean accept(Component aComponent)
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Determines whether a Component is an acceptable choice as the new focus owner. By default, this method will accept a Component if and only if it is visible, displayable, enabled, and focusable.
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Parameters:
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aComponent - the Component whose fitness as a focus owner is to be tested
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Returns:
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true if aComponent is visible, displayable, enabled, and focusable; false otherwise