| /* JPanel.java -- |
| Copyright (C) 2002, 2004, 2006, 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 javax.swing; |
| |
| import java.awt.FlowLayout; |
| import java.awt.LayoutManager; |
| |
| import javax.accessibility.Accessible; |
| import javax.accessibility.AccessibleContext; |
| import javax.accessibility.AccessibleRole; |
| import javax.swing.plaf.PanelUI; |
| |
| /** |
| * An instance of JPanel can be added to a panel, frame etc |
| * |
| * @author Ronald Veldema (rveldema@cs.vu.nl) |
| */ |
| public class JPanel extends JComponent implements Accessible |
| { |
| /** |
| * Provides accessibility support for <code>JPanel</code>. |
| * |
| * @author Roman Kennke (roman@kennke.org) |
| */ |
| protected class AccessibleJPanel extends AccessibleJComponent |
| { |
| /** |
| * Creates a new instance of <code>AccessibleJPanel</code>. |
| */ |
| protected AccessibleJPanel() |
| { |
| // Nothing to do here. |
| } |
| |
| /** |
| * Returns the accessible role for <code>JPanel</code>, which is |
| * {@link AccessibleRole#PANEL}. |
| * |
| * @return the accessible role for <code>JPanel</code> |
| */ |
| public AccessibleRole getAccessibleRole() |
| { |
| return AccessibleRole.PANEL; |
| } |
| } |
| |
| /** |
| * Creates a new panel with a new instance of {@link FlowLayout} as the |
| * layout manager and double-buffering enabled. |
| */ |
| public JPanel() |
| { |
| this(new FlowLayout(), true); |
| } |
| |
| /** |
| * Creates a new panel with double-buffering enabled or disabled as |
| * specified. The default layout manager is an instance of |
| * {@link FlowLayout}. |
| * |
| * @param isDoubleBuffered a flag that controls whether or not |
| * double-buffering is enabled. |
| */ |
| public JPanel(boolean isDoubleBuffered) |
| { |
| this(new FlowLayout(), isDoubleBuffered); |
| } |
| |
| /** |
| * Creates a new panel with the specified layout manager. Double-buffering |
| * is enabled by default. |
| * |
| * @param layout the layout manager (<code>null</code> permitted). |
| */ |
| public JPanel(LayoutManager layout) |
| { |
| this(layout, true); |
| } |
| |
| /** |
| * Creates a new panel with the specified layout manager and |
| * double-buffering. |
| * |
| * @param layout the layout manager (<code>null</code> permitted). |
| * @param isDoubleBuffered a flag that controls whether or not |
| * double-buffering is enabled. |
| */ |
| public JPanel(LayoutManager layout, boolean isDoubleBuffered) |
| { |
| setLayout(layout); |
| setOpaque(true); |
| setDoubleBuffered(isDoubleBuffered); |
| updateUI(); |
| } |
| |
| /** |
| * Returns the suffix (<code>"PanelUI"</code> in this case) used to |
| * determine the class name for a UI delegate that can provide the look and |
| * feel for a <code>JPanel</code>. |
| * |
| * @return <code>"PanelUI"</code>. |
| */ |
| public String getUIClassID() |
| { |
| return "PanelUI"; |
| } |
| |
| /** |
| * Sets the UI delegate for the <code>JPanel</code> component. |
| * |
| * @param ui the UI delegate. |
| * |
| * @since 1.4 |
| * @see #getUI() |
| */ |
| public void setUI(PanelUI ui) |
| { |
| super.setUI(ui); |
| } |
| |
| /** |
| * Returns the UI delegate for the <code>JPanel</code> component. |
| * |
| * @return The UI delegate. |
| * |
| * @since 1.4 |
| * @see #setUI(PanelUI) |
| */ |
| public PanelUI getUI() |
| { |
| return (PanelUI) ui; |
| } |
| |
| /** |
| * Sets this panel's UI delegate to the default (obtained from the |
| * {@link UIManager}) for the current look and feel. |
| */ |
| public void updateUI() |
| { |
| setUI((PanelUI) UIManager.getUI(this)); |
| } |
| |
| /** |
| * Returns the object that provides accessibility features for this |
| * <code>JPanel</code> component. |
| * |
| * @return The accessible context (an instance of {@link AccessibleJPanel}). |
| */ |
| public AccessibleContext getAccessibleContext() |
| { |
| if (accessibleContext == null) |
| accessibleContext = new AccessibleJPanel(); |
| return accessibleContext; |
| } |
| |
| /** |
| * Returns an implementation-dependent string describing the attributes of |
| * this <code>JPanel</code>. |
| * |
| * @return A string describing the attributes of this <code>JPanel</code> |
| * (never <code>null</code>). |
| */ |
| protected String paramString() |
| { |
| return super.paramString(); |
| } |
| } |