/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package javax.swing;
import java.awt.
Component;
import java.awt.
Container;
import java.awt.
FocusTraversalPolicy;
import java.util.
Comparator;
/**
* This class has been obsoleted by the 1.4 focus APIs. While client code may
* still use this class, developers are strongly encouraged to use
* <code>java.awt.KeyboardFocusManager</code> and
* <code>java.awt.DefaultKeyboardFocusManager</code> instead.
* <p>
* Please see
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
* How to Use the Focus Subsystem</a>,
* a section in <em>The Java Tutorial</em>, and the
* <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
* for more information.
*
* @author Arnaud Weber
* @author David Mendenhall
*/
public class
DefaultFocusManager extends
FocusManager {
final
FocusTraversalPolicy gluePolicy =
new
LegacyGlueFocusTraversalPolicy(this);
private final
FocusTraversalPolicy layoutPolicy =
new
LegacyLayoutFocusTraversalPolicy(this);
private final
LayoutComparator comparator =
new
LayoutComparator();
public
DefaultFocusManager() {
setDefaultFocusTraversalPolicy(
gluePolicy);
}
public
Component getComponentAfter(
Container aContainer,
Component aComponent)
{
Container root = (
aContainer.
isFocusCycleRoot())
?
aContainer
:
aContainer.
getFocusCycleRootAncestor();
// Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
// traversal policy is non-legacy, then honor it.
if (
root != null) {
FocusTraversalPolicy policy =
root.
getFocusTraversalPolicy();
if (
policy !=
gluePolicy) {
return
policy.
getComponentAfter(
root,
aComponent);
}
comparator.
setComponentOrientation(
root.
getComponentOrientation());
return
layoutPolicy.
getComponentAfter(
root,
aComponent);
}
return null;
}
public
Component getComponentBefore(
Container aContainer,
Component aComponent)
{
Container root = (
aContainer.
isFocusCycleRoot())
?
aContainer
:
aContainer.
getFocusCycleRootAncestor();
// Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
// traversal policy is non-legacy, then honor it.
if (
root != null) {
FocusTraversalPolicy policy =
root.
getFocusTraversalPolicy();
if (
policy !=
gluePolicy) {
return
policy.
getComponentBefore(
root,
aComponent);
}
comparator.
setComponentOrientation(
root.
getComponentOrientation());
return
layoutPolicy.
getComponentBefore(
root,
aComponent);
}
return null;
}
public
Component getFirstComponent(
Container aContainer) {
Container root = (
aContainer.
isFocusCycleRoot())
?
aContainer
:
aContainer.
getFocusCycleRootAncestor();
// Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
// traversal policy is non-legacy, then honor it.
if (
root != null) {
FocusTraversalPolicy policy =
root.
getFocusTraversalPolicy();
if (
policy !=
gluePolicy) {
return
policy.
getFirstComponent(
root);
}
comparator.
setComponentOrientation(
root.
getComponentOrientation());
return
layoutPolicy.
getFirstComponent(
root);
}
return null;
}
public
Component getLastComponent(
Container aContainer) {
Container root = (
aContainer.
isFocusCycleRoot())
?
aContainer
:
aContainer.
getFocusCycleRootAncestor();
// Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
// traversal policy is non-legacy, then honor it.
if (
root != null) {
FocusTraversalPolicy policy =
root.
getFocusTraversalPolicy();
if (
policy !=
gluePolicy) {
return
policy.
getLastComponent(
root);
}
comparator.
setComponentOrientation(
root.
getComponentOrientation());
return
layoutPolicy.
getLastComponent(
root);
}
return null;
}
public boolean
compareTabOrder(
Component a,
Component b) {
return (
comparator.
compare(
a,
b) < 0);
}
}
final class
LegacyLayoutFocusTraversalPolicy
extends
LayoutFocusTraversalPolicy
{
LegacyLayoutFocusTraversalPolicy(
DefaultFocusManager defaultFocusManager) {
super(new
CompareTabOrderComparator(
defaultFocusManager));
}
}
final class
CompareTabOrderComparator implements
Comparator<
Component> {
private final
DefaultFocusManager defaultFocusManager;
CompareTabOrderComparator(
DefaultFocusManager defaultFocusManager) {
this.
defaultFocusManager =
defaultFocusManager;
}
public int
compare(
Component o1,
Component o2) {
if (
o1 ==
o2) {
return 0;
}
return (
defaultFocusManager.
compareTabOrder(
o1,
o2)) ? -1 : 1;
}
}