javax.swing

Class SortingFocusTraversalPolicy

java.lang.Object

java.awt.FocusTraversalPolicy

javax.swing.InternalFrameFocusTraversalPolicy

javax.swing.SortingFocusTraversalPolicy

Direct Known Subclasses:

LayoutFocusTraversalPolicy

public class SortingFocusTraversalPolicy
extends InternalFrameFocusTraversalPolicy

Since:

1.4

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SortingFocusTraversalPolicy() Creates a new SortingFocusTraversalPolicy with no comparator set.
	SortingFocusTraversalPolicy(Comparator<? super Component> comparator) Creates a new SortingFocusTraversalPolicy with the given comparator set.

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	accept(Component comp) Decide whether a component is an acceptable focus owner.
protected Comparator<? super Component>	getComparator() Get the current value of the comparator property.
Component	getComponentAfter(Container root, Component comp) Return the component which follows the specified component in this focus cycle, relative to the order imposed by comparator.
Component	getComponentBefore(Container root, Component comp) Return the component which precedes the specified component in this focus cycle, relative to the order imposed by comparator.
Component	getDefaultComponent(Container root) Return the default component of root, which is by default the same as the first component, returned by getFirstComponent(java.awt.Container).
Component	getFirstComponent(Container root) Return the first focusable component of the focus cycle root comp under the ordering imposed by the comparator property.
boolean	getImplicitDownCycleTraversal() Return the current value of the implicitDownCycleTraversal property.
Component	getLastComponent(Container root) Return the last focusable component of the focus cycle root comp under the ordering imposed by the comparator property.
protected void	setComparator(Comparator<? super Component> comparator) Set the current value of the comparator property.
void	setImplicitDownCycleTraversal(boolean down) Set the current value of the implicitDownCycleTraversal property.

Methods inherited from class javax.swing.InternalFrameFocusTraversalPolicy

getInitialComponent

Methods inherited from class java.awt.FocusTraversalPolicy

getInitialComponent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SortingFocusTraversalPolicy

protected SortingFocusTraversalPolicy()

Creates a new SortingFocusTraversalPolicy with no comparator set.

SortingFocusTraversalPolicy

public SortingFocusTraversalPolicy(Comparator<? super Component> comparator)

Creates a new SortingFocusTraversalPolicy with the given comparator set.

Parameters:

comparator - the comparator to set

Method Detail

accept

protected boolean accept(Component comp)

Decide whether a component is an acceptable focus owner.

Parameters:

comp - The component which is a candidate for focus ownership.

Returns:

true if the component is focusable, displayable, visible, and enabled; otherwise false

getComparator

protected Comparator<? super Component> getComparator()

Get the current value of the comparator property.

Returns:

the current value of the property

See Also:

setComparator(java.util.Comparator<? super java.awt.Component>)

setComparator

protected void setComparator(Comparator<? super Component> comparator)

Set the current value of the comparator property.

Parameters:

comparator - the new value of the property

See Also:

getComparator()

getComponentAfter

public Component getComponentAfter(Container root,
                          Component comp)

Return the component which follows the specified component in this focus cycle, relative to the order imposed by comparator. Candidate components are only considered if they are accepted by the accept(java.awt.Component) method. If getImplicitDownCycleTraversal() is true and the comp is a focus cycle root, an "implicit DownCycle" occurs and the method returns the getDefaultComponent(comp).

Specified by:

getComponentAfter in class FocusTraversalPolicy

Parameters:

root - the focus cycle root to search for a successor within

comp - the component to search for the successor of

Returns:

the component following the specified component under the specified root, or null if no such component is found

Throws:

IllegalArgumentException - if either argument is null, or if the root is not a focus cycle root of the component

getComponentBefore

public Component getComponentBefore(Container root,
                           Component comp)

Return the component which precedes the specified component in this focus cycle, relative to the order imposed by comparator. Candidate components are only considered if they are accepted by the accept(java.awt.Component) method.

Specified by:

getComponentBefore in class FocusTraversalPolicy

Parameters:

root - the focus cycle root to search for a predecessor within

comp - the component to search for the predecessor of

Returns:

the component preceding the specified component under the specified root, or null if no such component is found

Throws:

IllegalArgumentException - if either argument is null, or if the root is not a focus cycle root of the component

getDefaultComponent

public Component getDefaultComponent(Container root)

Return the default component of root, which is by default the same as the first component, returned by getFirstComponent(java.awt.Container).

Specified by:

getDefaultComponent in class FocusTraversalPolicy

Parameters:

root - the focus cycle root to return the default component of

Returns:

the default focus component for root

Throws:

IllegalArgumentException - if root is null

getFirstComponent

public Component getFirstComponent(Container root)

Return the first focusable component of the focus cycle root comp under the ordering imposed by the comparator property. Candidate components are only considered if they are accepted by the accept(java.awt.Component) method.

Specified by:

getFirstComponent in class FocusTraversalPolicy

Parameters:

root - the focus cycle root to search for the first component of

Returns:

the first component under root, or null if no components are found.

Throws:

IllegalArgumentException - if root is null

getLastComponent

public Component getLastComponent(Container root)

Return the last focusable component of the focus cycle root comp under the ordering imposed by the comparator property. Candidate components are only considered if they are accepted by the accept(java.awt.Component) method.

Specified by:

getLastComponent in class FocusTraversalPolicy

Parameters:

root - the focus cycle root to search for the last component of

Returns:

the last component under root, or null if no components are found.

Throws:

IllegalArgumentException - if root is null

getImplicitDownCycleTraversal

public boolean getImplicitDownCycleTraversal()

Return the current value of the implicitDownCycleTraversal property.

Returns:

the current value of the property

See Also:

setImplicitDownCycleTraversal(boolean)

setImplicitDownCycleTraversal

public void setImplicitDownCycleTraversal(boolean down)

Set the current value of the implicitDownCycleTraversal property.

Parameters:

down - the new value of the property

See Also:

getImplicitDownCycleTraversal()