--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/javax/swing/JPanel.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,248 @@
+/*
+ * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+package javax.swing;
+
+import java.awt.*;
+
+import javax.swing.plaf.*;
+import javax.accessibility.*;
+
+import java.io.Serializable;
+import java.io.ObjectOutputStream;
+import java.io.ObjectInputStream;
+import java.io.IOException;
+
+
+/**
+ * <code>JPanel</code> is a generic lightweight container.
+ * For examples and task-oriented documentation for JPanel, see
+ * <a
+ href="http://java.sun.com/docs/books/tutorial/uiswing/components/panel.html">How to Use Panels</a>,
+ * a section in <em>The Java Tutorial</em>.
+ * <p>
+ * <strong>Warning:</strong> Swing is not thread safe. For more
+ * information see <a
+ * href="package-summary.html#threading">Swing's Threading
+ * Policy</a>.
+ * <p>
+ * <strong>Warning:</strong>
+ * Serialized objects of this class will not be compatible with
+ * future Swing releases. The current serialization support is
+ * appropriate for short term storage or RMI between applications running
+ * the same version of Swing. As of 1.4, support for long term storage
+ * of all JavaBeans<sup><font size="-2">TM</font></sup>
+ * has been added to the <code>java.beans</code> package.
+ * Please see {@link java.beans.XMLEncoder}.
+ *
+ * @beaninfo
+ * description: A generic lightweight container.
+ *
+ * @author Arnaud Weber
+ * @author Steve Wilson
+ */
+public class JPanel extends JComponent implements Accessible
+{
+ /**
+ * @see #getUIClassID
+ * @see #readObject
+ */
+ private static final String uiClassID = "PanelUI";
+
+ /**
+ * Creates a new JPanel with the specified layout manager and buffering
+ * strategy.
+ *
+ * @param layout the LayoutManager to use
+ * @param isDoubleBuffered a boolean, true for double-buffering, which
+ * uses additional memory space to achieve fast, flicker-free
+ * updates
+ */
+ public JPanel(LayoutManager layout, boolean isDoubleBuffered) {
+ setLayout(layout);
+ setDoubleBuffered(isDoubleBuffered);
+ setUIProperty("opaque", Boolean.TRUE);
+ updateUI();
+ }
+
+ /**
+ * Create a new buffered JPanel with the specified layout manager
+ *
+ * @param layout the LayoutManager to use
+ */
+ public JPanel(LayoutManager layout) {
+ this(layout, true);
+ }
+
+ /**
+ * Creates a new <code>JPanel</code> with <code>FlowLayout</code>
+ * and the specified buffering strategy.
+ * If <code>isDoubleBuffered</code> is true, the <code>JPanel</code>
+ * will use a double buffer.
+ *
+ * @param isDoubleBuffered a boolean, true for double-buffering, which
+ * uses additional memory space to achieve fast, flicker-free
+ * updates
+ */
+ public JPanel(boolean isDoubleBuffered) {
+ this(new FlowLayout(), isDoubleBuffered);
+ }
+
+ /**
+ * Creates a new <code>JPanel</code> with a double buffer
+ * and a flow layout.
+ */
+ public JPanel() {
+ this(true);
+ }
+
+ /**
+ * Resets the UI property with a value from the current look and feel.
+ *
+ * @see JComponent#updateUI
+ */
+ public void updateUI() {
+ setUI((PanelUI)UIManager.getUI(this));
+ }
+
+ /**
+ * Returns the look and feel (L&F) object that renders this component.
+ *
+ * @return the PanelUI object that renders this component
+ * @since 1.4
+ */
+ public PanelUI getUI() {
+ return (PanelUI)ui;
+ }
+
+
+ /**
+ * Sets the look and feel (L&F) object that renders this component.
+ *
+ * @param ui the PanelUI L&F object
+ * @see UIDefaults#getUI
+ * @since 1.4
+ * @beaninfo
+ * bound: true
+ * hidden: true
+ * attribute: visualUpdate true
+ * description: The UI object that implements the Component's LookAndFeel.
+ */
+ public void setUI(PanelUI ui) {
+ super.setUI(ui);
+ }
+
+ /**
+ * Returns a string that specifies the name of the L&F class
+ * that renders this component.
+ *
+ * @return "PanelUI"
+ * @see JComponent#getUIClassID
+ * @see UIDefaults#getUI
+ * @beaninfo
+ * expert: true
+ * description: A string that specifies the name of the L&F class.
+ */
+ public String getUIClassID() {
+ return uiClassID;
+ }
+
+
+ /**
+ * See readObject() and writeObject() in JComponent for more
+ * information about serialization in Swing.
+ */
+ private void writeObject(ObjectOutputStream s) throws IOException {
+ s.defaultWriteObject();
+ if (getUIClassID().equals(uiClassID)) {
+ byte count = JComponent.getWriteObjCounter(this);
+ JComponent.setWriteObjCounter(this, --count);
+ if (count == 0 && ui != null) {
+ ui.installUI(this);
+ }
+ }
+ }
+
+
+ /**
+ * Returns a string representation of this JPanel. This method
+ * is intended to be used only for debugging purposes, and the
+ * content and format of the returned string may vary between
+ * implementations. The returned string may be empty but may not
+ * be <code>null</code>.
+ *
+ * @return a string representation of this JPanel.
+ */
+ protected String paramString() {
+ return super.paramString();
+ }
+
+/////////////////
+// Accessibility support
+////////////////
+
+ /**
+ * Gets the AccessibleContext associated with this JPanel.
+ * For JPanels, the AccessibleContext takes the form of an
+ * AccessibleJPanel.
+ * A new AccessibleJPanel instance is created if necessary.
+ *
+ * @return an AccessibleJPanel that serves as the
+ * AccessibleContext of this JPanel
+ */
+ public AccessibleContext getAccessibleContext() {
+ if (accessibleContext == null) {
+ accessibleContext = new AccessibleJPanel();
+ }
+ return accessibleContext;
+ }
+
+ /**
+ * This class implements accessibility support for the
+ * <code>JPanel</code> class. It provides an implementation of the
+ * Java Accessibility API appropriate to panel user-interface
+ * elements.
+ * <p>
+ * <strong>Warning:</strong>
+ * Serialized objects of this class will not be compatible with
+ * future Swing releases. The current serialization support is
+ * appropriate for short term storage or RMI between applications running
+ * the same version of Swing. As of 1.4, support for long term storage
+ * of all JavaBeans<sup><font size="-2">TM</font></sup>
+ * has been added to the <code>java.beans</code> package.
+ * Please see {@link java.beans.XMLEncoder}.
+ */
+ protected class AccessibleJPanel extends AccessibleJComponent {
+
+ /**
+ * Get the role of this object.
+ *
+ * @return an instance of AccessibleRole describing the role of the
+ * object
+ */
+ public AccessibleRole getAccessibleRole() {
+ return AccessibleRole.PANEL;
+ }
+ }
+}