| /* CompatibilityFocusTraversalPolicy.java -- Provides compatibility to old |
| focus API |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package javax.swing; |
| |
| import java.awt.Component; |
| import java.awt.Container; |
| import java.awt.FocusTraversalPolicy; |
| import java.util.HashMap; |
| |
| /** |
| * Provides compatibility to the older focus API in |
| * {@link JComponent#setNextFocusableComponent(Component)}. |
| * |
| * @author Roman Kennke (kennke@aicas.com) |
| */ |
| class CompatibilityFocusTraversalPolicy |
| extends FocusTraversalPolicy |
| { |
| |
| /** |
| * The focus traversal policy that has been installed on the focus cycle |
| * root before, and to which we fall back. |
| */ |
| private FocusTraversalPolicy fallback; |
| |
| /** |
| * Maps components to their next focused components. |
| */ |
| private HashMap forward; |
| |
| /** |
| * Maps components to their previous focused components. |
| */ |
| private HashMap backward; |
| |
| /** |
| * Creates a new CompatibilityFocusTraversalPolicy with the specified |
| * policy as fallback. |
| * |
| * @param p the fallback policy |
| */ |
| CompatibilityFocusTraversalPolicy(FocusTraversalPolicy p) |
| { |
| fallback = p; |
| forward = new HashMap(); |
| backward = new HashMap(); |
| } |
| |
| public Component getComponentAfter(Container root, Component current) |
| { |
| Component next = (Component) forward.get(current); |
| if (next == null && fallback != null) |
| next = fallback.getComponentAfter(root, current); |
| return next; |
| } |
| |
| public Component getComponentBefore(Container root, Component current) |
| { |
| Component previous = (Component) backward.get(current); |
| if (previous == null && fallback != null) |
| previous = fallback.getComponentAfter(root, current); |
| return previous; |
| } |
| |
| public Component getFirstComponent(Container root) |
| { |
| Component first = null; |
| if (fallback != null) |
| first = fallback.getFirstComponent(root); |
| return first; |
| } |
| |
| public Component getLastComponent(Container root) |
| { |
| Component last = null; |
| if (fallback != null) |
| last = fallback.getLastComponent(root); |
| return last; |
| } |
| |
| public Component getDefaultComponent(Container root) |
| { |
| Component def = null; |
| if (fallback != null) |
| def = fallback.getDefaultComponent(root); |
| return def; |
| } |
| |
| /** |
| * Sets a next focused component for a specified component. This is called |
| * by {@link JComponent#setNextFocusableComponent(Component)}. |
| * |
| * @param current the current component |
| * @param next the next focused component |
| */ |
| void setNextFocusableComponent(Component current, Component next) |
| { |
| forward.put(current, next); |
| backward.put(next, current); |
| } |
| |
| /** |
| * Sets a next focused component for a specified component. This is called |
| * by {@link JComponent#setNextFocusableComponent(Component)}. |
| * |
| * @param current the current component |
| * @param next the next focused component |
| */ |
| void addNextFocusableComponent(Component current, Component next) |
| { |
| forward.put(current, next); |
| backward.put(next, current); |
| } |
| |
| /** |
| * Removes a focused component mapping. This is called |
| * by {@link JComponent#setNextFocusableComponent(Component)}. |
| * |
| * @param current the current component |
| * @param next the next focused component |
| */ |
| void removeNextFocusableComponent(Component current, Component next) |
| { |
| forward.remove(current); |
| backward.remove(next); |
| } |
| } |