| /* DefaultFocusTraversalPolicy.java -- |
| Copyright (C) 2002, 2005 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. |
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| 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. |
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| 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 |
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| exception statement from your version. */ |
| |
| |
| package java.awt; |
| |
| /** |
| * DefaultFocusTraversalPolicy is the default focus traversal policy |
| * used by Containers. |
| * |
| * This policy sharpens ContainerOrderFocusTraversalPolicy's |
| * acceptance criteria, to reject those Components that have |
| * unfocusable peers. Despite this extra strictness, this policy will |
| * always accept a Component that has explicitly been set focusable by |
| * any means. |
| * |
| * This AWT implementation assumes that the peers of the following |
| * Components are not focusable: Canvas, Panel, Label, ScrollPane, |
| * Scrollbar, Window, and any lightweight Component. |
| * |
| * A Component's focusability is independent of the focusability of |
| * its peer. |
| * |
| * @author Thomas Fitzsimmons (fitzsim@redhat.com) |
| * @since 1.4 |
| */ |
| public class DefaultFocusTraversalPolicy |
| extends ContainerOrderFocusTraversalPolicy |
| { |
| private static final long serialVersionUID = 8876966522510157497L; |
| |
| /** |
| * Construct a default focus traversal policy. |
| */ |
| public DefaultFocusTraversalPolicy () |
| { |
| } |
| |
| /** |
| * Check whether a given Component would be acceptable as a focus |
| * owner. The Component must be displayable, visible and enabled to |
| * be acceptable. If the Component's focus traversability has been |
| * overridden, by overriding Component.isFocusTraversable or |
| * Component.isFocusable, or by calling Component.setFocusable, then |
| * the Component will be accepted if it is focusable. If the |
| * Component uses the default focus traversable behaviour, then |
| * <code>comp</code> will always be rejected if it is a Canvas, |
| * Panel, Label, ScrollPane, Scrollbar, Window or lightweight |
| * Component. |
| * |
| * @param comp the Component to check |
| * |
| * @return true if the Component is an acceptable target for |
| * keyboard input focus, false otherwise |
| */ |
| protected boolean accept (Component comp) |
| { |
| if (comp.visible |
| && comp.isDisplayable () |
| && comp.enabled) |
| { |
| if (comp.isFocusTraversableOverridden != 0 |
| && (comp.isFocusTraversable () || comp.isFocusable())) |
| return true; |
| |
| if (!(comp instanceof Canvas |
| || comp instanceof Panel |
| || comp instanceof Label |
| || comp instanceof ScrollPane |
| || comp instanceof Scrollbar |
| || comp instanceof Window |
| || comp.isLightweight ())) |
| return true; |
| } |
| return false; |
| } |
| } |