2 Copyright (C) 2002, 2004, 2006, Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
41 import java.awt.FlowLayout;
42 import java.awt.LayoutManager;
44 import javax.accessibility.Accessible;
45 import javax.accessibility.AccessibleContext;
46 import javax.accessibility.AccessibleRole;
47 import javax.swing.plaf.PanelUI;
50 * An instance of JPanel can be added to a panel, frame etc
52 * @author Ronald Veldema (rveldema@cs.vu.nl)
54 public class JPanel extends JComponent implements Accessible
57 * Provides accessibility support for <code>JPanel</code>.
59 * @author Roman Kennke (roman@kennke.org)
61 protected class AccessibleJPanel extends AccessibleJComponent
64 * Creates a new instance of <code>AccessibleJPanel</code>.
66 protected AccessibleJPanel()
68 // Nothing to do here.
72 * Returns the accessible role for <code>JPanel</code>, which is
73 * {@link AccessibleRole#PANEL}.
75 * @return the accessible role for <code>JPanel</code>
77 public AccessibleRole getAccessibleRole()
79 return AccessibleRole.PANEL;
84 * Creates a new panel with a new instance of {@link FlowLayout} as the
85 * layout manager and double-buffering enabled.
89 this(new FlowLayout(), true);
93 * Creates a new panel with double-buffering enabled or disabled as
94 * specified. The default layout manager is an instance of
97 * @param isDoubleBuffered a flag that controls whether or not
98 * double-buffering is enabled.
100 public JPanel(boolean isDoubleBuffered)
102 this(new FlowLayout(), isDoubleBuffered);
106 * Creates a new panel with the specified layout manager. Double-buffering
107 * is enabled by default.
109 * @param layout the layout manager (<code>null</code> permitted).
111 public JPanel(LayoutManager layout)
117 * Creates a new panel with the specified layout manager and
120 * @param layout the layout manager (<code>null</code> permitted).
121 * @param isDoubleBuffered a flag that controls whether or not
122 * double-buffering is enabled.
124 public JPanel(LayoutManager layout, boolean isDoubleBuffered)
128 setDoubleBuffered(isDoubleBuffered);
133 * Returns the suffix (<code>"PanelUI"</code> in this case) used to
134 * determine the class name for a UI delegate that can provide the look and
135 * feel for a <code>JPanel</code>.
137 * @return <code>"PanelUI"</code>.
139 public String getUIClassID()
145 * Sets the UI delegate for the <code>JPanel</code> component.
147 * @param ui the UI delegate.
152 public void setUI(PanelUI ui)
158 * Returns the UI delegate for the <code>JPanel</code> component.
160 * @return The UI delegate.
163 * @see #setUI(PanelUI)
165 public PanelUI getUI()
171 * Sets this panel's UI delegate to the default (obtained from the
172 * {@link UIManager}) for the current look and feel.
174 public void updateUI()
176 setUI((PanelUI) UIManager.getUI(this));
180 * Returns the object that provides accessibility features for this
181 * <code>JPanel</code> component.
183 * @return The accessible context (an instance of {@link AccessibleJPanel}).
185 public AccessibleContext getAccessibleContext()
187 if (accessibleContext == null)
188 accessibleContext = new AccessibleJPanel();
189 return accessibleContext;
193 * Returns an implementation-dependent string describing the attributes of
194 * this <code>JPanel</code>.
196 * @return A string describing the attributes of this <code>JPanel</code>
197 * (never <code>null</code>).
199 protected String paramString()
201 return super.paramString();