150 lines
4.3 KiB
Java
150 lines
4.3 KiB
Java
/* Panel.java -- Simple container object
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Copyright (C) 1999, 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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import java.awt.peer.PanelPeer;
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import java.awt.peer.ContainerPeer;
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import java.awt.peer.ComponentPeer;
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import java.io.Serializable;
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import javax.accessibility.Accessible;
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import javax.accessibility.AccessibleContext;
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import javax.accessibility.AccessibleRole;
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/**
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* A panel is a simple container class. It's default layout is the
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* <code>FlowLayout</code> manager.
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*
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* @author Aaron M. Renn <arenn@urbanophile.com>
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* @author Eric Blake <ebb9@email.byu.edu>
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* @see FlowLayout
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* @since 1.0
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* @status updated to 1.4
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*/
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public class Panel extends Container implements Accessible
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{
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/**
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* Compatible with JDK 1.0+.
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*/
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private static final long serialVersionUID = -2728009084054400034L;
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/** The cached accessible context. */
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private transient AccessibleContext context;
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/**
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* Initializes a new instance of <code>Panel</code> that has a default
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* layout manager of <code>FlowLayout</code>.
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*/
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public Panel()
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{
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this(new FlowLayout());
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}
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/**
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* Initializes a new instance of <code>Panel</code> with the specified
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* layout manager.
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*
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* @param layoutManager the layout manager for this object
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* @since 1.1
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*/
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public Panel(LayoutManager layoutManager)
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{
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setLayout(layoutManager);
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}
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/**
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* Notifies this object to create its native peer.
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*
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* @see #isDisplayable()
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* @see #removeNotify()
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*/
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public void addNotify()
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{
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if (peer == null)
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peer = getToolkit().createPanel(this);
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super.addNotify();
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}
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/**
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* Gets the AccessibleContext associated with this panel, creating one if
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* necessary. This always returns an instance of {@link AccessibleAWTPanel}.
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*
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* @return the accessibility context of this panel
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* @since 1.3
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*/
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public AccessibleContext getAccessibleContext()
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{
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if (context == null)
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context = new AccessibleAWTPanel();
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return context;
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}
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/**
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* This class provides accessibility support for Panels, and is the
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* runtime type returned by {@link #getAccessibleContext()}.
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*
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* @author Eric Blake <ebb9@email.byu.edu>
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* @since 1.3
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*/
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protected class AccessibleAWTPanel extends AccessibleAWTContainer
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{
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/**
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* Compatible with JDK 1.4+.
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*/
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private static final long serialVersionUID = -6409552226660031050L;
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/**
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* The default constructor.
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*/
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protected AccessibleAWTPanel()
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{
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}
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/**
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* Get the role of this accessible object, a panel.
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*
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* @return the role of the object
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* @see AccessibleRole#PANEL
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*/
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public AccessibleRole getAccessibleRole()
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{
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return AccessibleRole.PANEL;
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}
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} // class AccessibleAWTPanel
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} // class Panel
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