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