mirror of git://gcc.gnu.org/git/gcc.git
110 lines
4.0 KiB
Java
110 lines
4.0 KiB
Java
/* DefaultFocusTraversalPolicy.java --
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Copyright (C) 2002 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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 java.awt;
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/**
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* DefaultFocusTraversalPolicy is the default focus traversal policy
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* used by Containers.
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*
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* This policy sharpens ContainerOrderFocusTraversalPolicy's
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* acceptance criteria, to reject those Components that have
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* unfocusable peers. Despite this extra strictness, this policy will
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* always accept a Component that has explicitly been set focusable by
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* any means.
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*
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* This AWT implementation assumes that the peers of the following
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* Components are not focusable: Canvas, Panel, Label, ScrollPane,
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* Scrollbar, Window, and any lightweight Component.
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*
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* A Component's focusability is independent of the focusability of
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* its peer.
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*
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* @author Thomas Fitzsimmons <fitzsim@redhat.com>
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* @since 1.4
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*/
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public class DefaultFocusTraversalPolicy
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extends ContainerOrderFocusTraversalPolicy
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{
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/**
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* Construct a default focus traversal policy.
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*/
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public DefaultFocusTraversalPolicy ()
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{
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}
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/**
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* Check whether a given Component would be acceptable as a focus
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* owner. The Component must be displayable, visible and enabled to
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* be acceptable. If the Component's focus traversability has been
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* overridden, by overriding Component.isFocusTraversable or
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* Component.isFocusable, or by calling Component.setFocusable, then
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* the Component will be accepted if it is focusable. If the
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* Component uses the default focus traversable behaviour, then
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* <code>comp</code> will always be rejected if it is a Canvas,
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* Panel, Label, ScrollPane, Scrollbar, Window or lightweight
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* Component.
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*
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* @param comp the Component to check
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*
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* @return true if the Component is an acceptable target for
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* keyboard input focus, false otherwise
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*/
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protected boolean accept (Component comp)
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{
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if (comp.visible
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&& comp.isDisplayable ()
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&& comp.enabled)
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{
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if (comp.isFocusTraversableOverridden != 0
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&& (comp.isFocusTraversable () || comp.isFocusable()))
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return true;
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if (!(comp instanceof Canvas
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|| comp instanceof Panel
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|| comp instanceof Label
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|| comp instanceof ScrollPane
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|| comp instanceof Scrollbar
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|| comp instanceof Window
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|| comp.isLightweight ()))
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return true;
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}
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return false;
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}
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}
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