1 /*
2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
69 * JDK 1.4 serialVersionUID
70 */
71 private static final long serialVersionUID = 486933713763926351L;
72
73 private boolean implicitDownCycleTraversal = true;
74
75 /**
76 * Used by getComponentAfter and getComponentBefore for efficiency. In
77 * order to maintain compliance with the specification of
78 * FocusTraversalPolicy, if traversal wraps, we should invoke
79 * getFirstComponent or getLastComponent. These methods may be overriden in
80 * subclasses to behave in a non-generic way. However, in the generic case,
81 * these methods will simply return the first or last Components of the
82 * sorted list, respectively. Since getComponentAfter and
83 * getComponentBefore have already built the list before determining
84 * that they need to invoke getFirstComponent or getLastComponent, the
85 * list should be reused if possible.
86 */
87 private transient Container cachedRoot;
88 private transient List<Component> cachedCycle;
89
90 /*
91 * We suppose to use getFocusTraversalCycle & getComponentIndex methods in order
92 * to divide the policy into two parts:
93 * 1) Making the focus traversal cycle.
94 * 2) Traversing the cycle.
95 * The 1st point assumes producing a list of components representing the focus
96 * traversal cycle. The two methods mentioned above should implement this logic.
97 * The 2nd point assumes implementing the common concepts of operating on the
98 * cycle: traversing back and forth, retrieving the initial/default/first/last
99 * component. These concepts are described in the AWT Focus Spec and they are
100 * applied to the FocusTraversalPolicy in general.
101 * Thus, a descendant of this policy may wish to not reimplement the logic of
102 * the 2nd point but just override the implementation of the 1st one.
103 * A striking example of such a descendant is the javax.swing.SortingFocusTraversalPolicy.
104 */
105 /*protected*/ private List<Component> getFocusTraversalCycle(Container aContainer) {
106 List<Component> cycle = new ArrayList<Component>();
107 enumerateCycle(aContainer, cycle);
108 return cycle;
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1 /*
2 * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
69 * JDK 1.4 serialVersionUID
70 */
71 private static final long serialVersionUID = 486933713763926351L;
72
73 private boolean implicitDownCycleTraversal = true;
74
75 /**
76 * Used by getComponentAfter and getComponentBefore for efficiency. In
77 * order to maintain compliance with the specification of
78 * FocusTraversalPolicy, if traversal wraps, we should invoke
79 * getFirstComponent or getLastComponent. These methods may be overriden in
80 * subclasses to behave in a non-generic way. However, in the generic case,
81 * these methods will simply return the first or last Components of the
82 * sorted list, respectively. Since getComponentAfter and
83 * getComponentBefore have already built the list before determining
84 * that they need to invoke getFirstComponent or getLastComponent, the
85 * list should be reused if possible.
86 */
87 private transient Container cachedRoot;
88 private transient List<Component> cachedCycle;
89
90 /**
91 * Constructs a {@code ContainerOrderFocusTraversalPolicy}.
92 */
93 public ContainerOrderFocusTraversalPolicy() {}
94
95 /*
96 * We suppose to use getFocusTraversalCycle & getComponentIndex methods in order
97 * to divide the policy into two parts:
98 * 1) Making the focus traversal cycle.
99 * 2) Traversing the cycle.
100 * The 1st point assumes producing a list of components representing the focus
101 * traversal cycle. The two methods mentioned above should implement this logic.
102 * The 2nd point assumes implementing the common concepts of operating on the
103 * cycle: traversing back and forth, retrieving the initial/default/first/last
104 * component. These concepts are described in the AWT Focus Spec and they are
105 * applied to the FocusTraversalPolicy in general.
106 * Thus, a descendant of this policy may wish to not reimplement the logic of
107 * the 2nd point but just override the implementation of the 1st one.
108 * A striking example of such a descendant is the javax.swing.SortingFocusTraversalPolicy.
109 */
110 /*protected*/ private List<Component> getFocusTraversalCycle(Container aContainer) {
111 List<Component> cycle = new ArrayList<Component>();
112 enumerateCycle(aContainer, cycle);
113 return cycle;
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