| /* |
| * Copyright (c) 2000, 2008, 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 javax.swing; |
| |
| import java.awt.FocusTraversalPolicy; |
| import java.awt.Component; |
| import java.awt.Container; |
| import java.awt.Window; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.io.*; |
| |
| |
| /** |
| * A FocusTraversalPolicy which provides support for legacy applications which |
| * handle focus traversal via JComponent.setNextFocusableComponent or by |
| * installing a custom DefaultFocusManager. If a specific traversal has not |
| * been hard coded, then that traversal is provided either by the custom |
| * DefaultFocusManager, or by a wrapped FocusTraversalPolicy instance. |
| * |
| * @author David Mendenhall |
| */ |
| final class LegacyGlueFocusTraversalPolicy extends FocusTraversalPolicy |
| implements Serializable |
| { |
| private transient FocusTraversalPolicy delegatePolicy; |
| private transient DefaultFocusManager delegateManager; |
| |
| private HashMap<Component, Component> forwardMap = new HashMap<Component, Component>(), |
| backwardMap = new HashMap<Component, Component>(); |
| |
| LegacyGlueFocusTraversalPolicy(FocusTraversalPolicy delegatePolicy) { |
| this.delegatePolicy = delegatePolicy; |
| } |
| LegacyGlueFocusTraversalPolicy(DefaultFocusManager delegateManager) { |
| this.delegateManager = delegateManager; |
| } |
| |
| void setNextFocusableComponent(Component left, Component right) { |
| forwardMap.put(left, right); |
| backwardMap.put(right, left); |
| } |
| void unsetNextFocusableComponent(Component left, Component right) { |
| forwardMap.remove(left); |
| backwardMap.remove(right); |
| } |
| |
| public Component getComponentAfter(Container focusCycleRoot, |
| Component aComponent) { |
| Component hardCoded = aComponent, prevHardCoded; |
| HashSet<Component> sanity = new HashSet<Component>(); |
| |
| do { |
| prevHardCoded = hardCoded; |
| hardCoded = forwardMap.get(hardCoded); |
| if (hardCoded == null) { |
| if (delegatePolicy != null && |
| prevHardCoded.isFocusCycleRoot(focusCycleRoot)) { |
| return delegatePolicy.getComponentAfter(focusCycleRoot, |
| prevHardCoded); |
| } else if (delegateManager != null) { |
| return delegateManager. |
| getComponentAfter(focusCycleRoot, aComponent); |
| } else { |
| return null; |
| } |
| } |
| if (sanity.contains(hardCoded)) { |
| // cycle detected; bail |
| return null; |
| } |
| sanity.add(hardCoded); |
| } while (!accept(hardCoded)); |
| |
| return hardCoded; |
| } |
| public Component getComponentBefore(Container focusCycleRoot, |
| Component aComponent) { |
| Component hardCoded = aComponent, prevHardCoded; |
| HashSet<Component> sanity = new HashSet<Component>(); |
| |
| do { |
| prevHardCoded = hardCoded; |
| hardCoded = backwardMap.get(hardCoded); |
| if (hardCoded == null) { |
| if (delegatePolicy != null && |
| prevHardCoded.isFocusCycleRoot(focusCycleRoot)) { |
| return delegatePolicy.getComponentBefore(focusCycleRoot, |
| prevHardCoded); |
| } else if (delegateManager != null) { |
| return delegateManager. |
| getComponentBefore(focusCycleRoot, aComponent); |
| } else { |
| return null; |
| } |
| } |
| if (sanity.contains(hardCoded)) { |
| // cycle detected; bail |
| return null; |
| } |
| sanity.add(hardCoded); |
| } while (!accept(hardCoded)); |
| |
| return hardCoded; |
| } |
| public Component getFirstComponent(Container focusCycleRoot) { |
| if (delegatePolicy != null) { |
| return delegatePolicy.getFirstComponent(focusCycleRoot); |
| } else if (delegateManager != null) { |
| return delegateManager.getFirstComponent(focusCycleRoot); |
| } else { |
| return null; |
| } |
| } |
| public Component getLastComponent(Container focusCycleRoot) { |
| if (delegatePolicy != null) { |
| return delegatePolicy.getLastComponent(focusCycleRoot); |
| } else if (delegateManager != null) { |
| return delegateManager.getLastComponent(focusCycleRoot); |
| } else { |
| return null; |
| } |
| } |
| public Component getDefaultComponent(Container focusCycleRoot) { |
| if (delegatePolicy != null) { |
| return delegatePolicy.getDefaultComponent(focusCycleRoot); |
| } else { |
| return getFirstComponent(focusCycleRoot); |
| } |
| } |
| private boolean accept(Component aComponent) { |
| if (!(aComponent.isVisible() && aComponent.isDisplayable() && |
| aComponent.isFocusable() && 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; |
| } |
| } |
| } |
| |
| return true; |
| } |
| private void writeObject(ObjectOutputStream out) throws IOException { |
| out.defaultWriteObject(); |
| |
| if (delegatePolicy instanceof Serializable) { |
| out.writeObject(delegatePolicy); |
| } else { |
| out.writeObject(null); |
| } |
| |
| if (delegateManager instanceof Serializable) { |
| out.writeObject(delegateManager); |
| } else { |
| out.writeObject(null); |
| } |
| } |
| private void readObject(ObjectInputStream in) |
| throws IOException, ClassNotFoundException |
| { |
| in.defaultReadObject(); |
| delegatePolicy = (FocusTraversalPolicy)in.readObject(); |
| delegateManager = (DefaultFocusManager)in.readObject(); |
| } |
| } |