Class DefaultFocusTraversalPolicy

Implemented Interfaces:

public class DefaultFocusTraversalPolicy
extends ContainerOrderFocusTraversalPolicy

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.
See Also:
Serialized Form

Constructor Summary

Construct a default focus traversal policy.

Method Summary

protected boolean
accept(Component comp)
Check whether a given Component would be acceptable as a focus owner.

Methods inherited from class java.awt.ContainerOrderFocusTraversalPolicy

accept, getComponentAfter, getComponentBefore, getDefaultComponent, getFirstComponent, getImplicitDownCycleTraversal, getLastComponent, setImplicitDownCycleTraversal

Methods inherited from class java.awt.FocusTraversalPolicy

getComponentAfter, getComponentBefore, getDefaultComponent, getFirstComponent, getInitialComponent, getLastComponent

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details


public DefaultFocusTraversalPolicy()
Construct a default focus traversal policy.

Method Details


protected boolean accept(Component comp)
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 comp will always be rejected if it is a Canvas, Panel, Label, ScrollPane, Scrollbar, Window or lightweight Component.
accept in interface ContainerOrderFocusTraversalPolicy
comp - the Component to check
true if the Component is an acceptable target for keyboard input focus, false otherwise -- 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. 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.