8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.desktop/share/classes/java/awt/DefaultFocusTraversalPolicy.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package java.awt;
+
+import java.awt.peer.ComponentPeer;
+
+
+/**
+ * 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
+ * {@code Container.getComponents()}. Portions of the hierarchy that are
+ * not visible and displayable will not be searched.
+ * <p>
+ * If client code has explicitly set the focusability of a Component by either
+ * overriding {@code Component.isFocusTraversable()} or
+ * {@code Component.isFocusable()}, or by calling
+ * {@code Component.setFocusable()}, then a DefaultFocusTraversalPolicy
+ * behaves exactly like a ContainerOrderFocusTraversalPolicy. If, however, the
+ * Component is relying on default focusability, then a
+ * DefaultFocusTraversalPolicy will reject all Components with non-focusable
+ * peers. This is the default FocusTraversalPolicy for all AWT Containers.
+ * <p>
+ * The focusability of a peer is implementation-dependent. Sun recommends that
+ * all implementations for a particular native platform construct peers with
+ * the same focusability. The recommendations for Windows and Unix are that
+ * Canvases, Labels, Panels, Scrollbars, ScrollPanes, Windows, and lightweight
+ * Components have non-focusable peers, and all other Components have focusable
+ * peers. These recommendations are used in the Sun AWT implementations. Note
+ * that the focusability of a Component's peer is different from, and does not
+ * impact, the focusability of the Component itself.
+ * <p>
+ * Please see
+ * <a href="http://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 David Mendenhall
+ *
+ * @see Container#getComponents
+ * @see Component#isFocusable
+ * @see Component#setFocusable
+ * @since 1.4
+ */
+public class DefaultFocusTraversalPolicy
+    extends ContainerOrderFocusTraversalPolicy
+{
+    /*
+     * serialVersionUID
+     */
+    private static final long serialVersionUID = 8876966522510157497L;
+
+    /**
+     * Determines whether a Component is an acceptable choice as the new
+     * focus owner. The Component must be visible, displayable, and enabled
+     * to be accepted. If client code has explicitly set the focusability
+     * of the Component by either overriding
+     * {@code Component.isFocusTraversable()} or
+     * {@code Component.isFocusable()}, or by calling
+     * {@code Component.setFocusable()}, then the Component will be
+     * accepted if and only if it is focusable. If, however, the Component is
+     * relying on default focusability, then all Canvases, Labels, Panels,
+     * Scrollbars, ScrollPanes, Windows, and lightweight Components will be
+     * rejected.
+     *
+     * @param aComponent the Component whose fitness as a focus owner is to
+     *        be tested
+     * @return {@code true} if aComponent meets the above requirements;
+     *         {@code false} otherwise
+     */
+    protected boolean accept(Component aComponent) {
+        if (!(aComponent.isVisible() && aComponent.isDisplayable() &&
+              aComponent.isEnabled()))
+        {
+            return false;
+        }
+
+        // Verify that the Component is recursively enabled. Disabling a
+        // heavyweight Container disables its children, whereas disabling
+        // a lightweight Container does not.
+        if (!(aComponent instanceof Window)) {
+            for (Container enableTest = aComponent.getParent();
+                 enableTest != null;
+                 enableTest = enableTest.getParent())
+            {
+                if (!(enableTest.isEnabled() || enableTest.isLightweight())) {
+                    return false;
+                }
+                if (enableTest instanceof Window) {
+                    break;
+                }
+            }
+        }
+
+        boolean focusable = aComponent.isFocusable();
+        if (aComponent.isFocusTraversableOverridden()) {
+            return focusable;
+        }
+
+        ComponentPeer peer = aComponent.peer;
+        return (peer != null && peer.isFocusable());
+    }
+}