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Préférences
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JavaTM 2 Platform Std. Ed. v1.4.2
javax.swing
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Constructor Summary | |
LayoutFocusTraversalPolicy()
Constructs a LayoutFocusTraversalPolicy. |
Method Summary | |
protected boolean |
accept(Component aComponent)
Determines whether the specified Component
is an acceptable choice as the new focus owner. |
Component |
getComponentAfter(Container focusCycleRoot,
Component aComponent)
Returns the Component that should receive the focus after aComponent. |
Component |
getComponentBefore(Container focusCycleRoot,
Component aComponent)
Returns the Component that should receive the focus before aComponent. |
Component |
getFirstComponent(Container focusCycleRoot)
Returns the first Component in the traversal cycle. |
Component |
getLastComponent(Container focusCycleRoot)
Returns the last Component in the traversal cycle. |
Methods inherited from class javax.swing.SortingFocusTraversalPolicy |
getComparator, getDefaultComponent, getImplicitDownCycleTraversal, setComparator, setImplicitDownCycleTraversal |
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 |
public LayoutFocusTraversalPolicy()
Method Detail |
public Component getComponentAfter(Container focusCycleRoot, Component aComponent)
By default, LayoutFocusTraversalPolicy implicitly transfers focus down-
cycle. That is, during normal 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.
getComponentAfter
in class SortingFocusTraversalPolicy
focusCycleRoot
- a focus cycle root of aComponentaComponent
- a (possibly indirect) child of focusCycleRoot, or
focusCycleRoot itself
IllegalArgumentException
- if focusCycleRoot is not a focus cycle
root of aComponent, or if either focusCycleRoot or aComponent is
nullpublic Component getComponentBefore(Container focusCycleRoot, Component aComponent)
By default, LayoutFocusTraversalPolicy implicitly transfers focus down-
cycle. That is, during normal 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.
getComponentBefore
in class SortingFocusTraversalPolicy
focusCycleRoot
- a focus cycle root of aComponentaComponent
- a (possibly indirect) child of focusCycleRoot, or
focusCycleRoot itself
IllegalArgumentException
- if focusCycleRoot is not a focus cycle
root of aComponent, or if either focusCycleRoot or aComponent is
nullpublic Component getFirstComponent(Container focusCycleRoot)
getFirstComponent
in class SortingFocusTraversalPolicy
focusCycleRoot
- the focus cycle root whose first Component is to
be returned
IllegalArgumentException
- if focusCycleRoot is nullpublic Component getLastComponent(Container focusCycleRoot)
getLastComponent
in class SortingFocusTraversalPolicy
focusCycleRoot
- the focus cycle root whose last Component is to be
returned
IllegalArgumentException
- if focusCycleRoot is nullprotected boolean accept(Component aComponent)
Component
is an acceptable choice as the new focus owner.
This method performs the following sequence of operations:
aComponent
is visible, displayable,
enabled, and focusable. If any of these properties is
false
, this method returns false
.
aComponent
is an instance of JTable
,
returns true
.
aComponent
is an instance of JComboBox
,
then returns the value of
aComponent.getUI().isFocusTraversable(aComponent)
.
aComponent
is a JComponent
with a JComponent.WHEN_FOCUSED
InputMap
that is neither null
nor empty, returns true
.
DefaultFocusTraversalPolicy.accept(aComponent)
.
accept
in class SortingFocusTraversalPolicy
aComponent
- the Component
whose fitness
as a focus owner is to be tested
true
if aComponent
is a valid choice
for a focus owner;
otherwise false
Component.isVisible()
,
Component.isDisplayable()
,
Component.isEnabled()
,
Component.isFocusable()
,
ComboBoxUI.isFocusTraversable(javax.swing.JComboBox)
,
JComponent.getInputMap(int)
,
DefaultFocusTraversalPolicy.accept(java.awt.Component)