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-/* Panel.java -- Simple container object
- Copyright (C) 1999, 2002, 2004, 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. */
-
-
-package java.awt;
-
-import javax.accessibility.Accessible;
-import javax.accessibility.AccessibleContext;
-import javax.accessibility.AccessibleRole;
-
-/**
- * A panel is a simple container class. It's default layout is the
- * <code>FlowLayout</code> manager.
- *
- * @author Aaron M. Renn (arenn@urbanophile.com)
- * @author Eric Blake (ebb9@email.byu.edu)
- * @see FlowLayout
- * @since 1.0
- * @status updated to 1.4
- */
-public class Panel extends Container implements Accessible
-{
- /**
- * Compatible with JDK 1.0+.
- */
- private static final long serialVersionUID = -2728009084054400034L;
-
- /** The cached accessible context. */
- private transient AccessibleContext context;
-
- /** Flag set when the first system-requested paint event is
- dispatched. */
- private transient boolean initialSystemUpdateDone;
-
- /** Flag set when the first application-requested paint event is
- consumed. */
- private transient boolean initialUpdateConsumed;
-
- /*
- * The number used to generate the name returned by getName.
- */
- private static transient long next_panel_number;
-
- /**
- * Initializes a new instance of <code>Panel</code> that has a default
- * layout manager of <code>FlowLayout</code>.
- */
- public Panel()
- {
- this(new FlowLayout());
- }
-
- /**
- * Initializes a new instance of <code>Panel</code> with the specified
- * layout manager.
- *
- * @param layoutManager the layout manager for this object
- * @since 1.1
- */
- public Panel(LayoutManager layoutManager)
- {
- setLayout(layoutManager);
- }
-
- /**
- * Notifies this object to create its native peer.
- *
- * @see #isDisplayable()
- * @see #removeNotify()
- */
- public void addNotify()
- {
- if (peer == null)
- peer = getToolkit().createPanel(this);
- super.addNotify();
- }
-
- /**
- * Gets the AccessibleContext associated with this panel, creating one if
- * necessary. This always returns an instance of {@link AccessibleAWTPanel}.
- *
- * @return the accessibility context of this panel
- * @since 1.3
- */
- public AccessibleContext getAccessibleContext()
- {
- if (context == null)
- context = new AccessibleAWTPanel();
- return context;
- }
-
- /**
- * This class provides accessibility support for Panels, and is the
- * runtime type returned by {@link #getAccessibleContext()}.
- *
- * @author Eric Blake (ebb9@email.byu.edu)
- * @since 1.3
- */
- protected class AccessibleAWTPanel extends AccessibleAWTContainer
- {
- /**
- * Compatible with JDK 1.4+.
- */
- private static final long serialVersionUID = -6409552226660031050L;
-
- /**
- * The default constructor.
- */
- protected AccessibleAWTPanel()
- {
- }
-
- /**
- * Get the role of this accessible object, a panel.
- *
- * @return the role of the object
- * @see AccessibleRole#PANEL
- */
- public AccessibleRole getAccessibleRole()
- {
- return AccessibleRole.PANEL;
- }
- }
-
- /**
- * Generate a unique name for this panel.
- *
- * @return A unique name for this panel.
- */
- String generateName ()
- {
- return "panel" + getUniqueLong ();
- }
-
- private static synchronized long getUniqueLong ()
- {
- return next_panel_number++;
- }
-}