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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/javax/swing/JPanel.java
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+/* 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();
+ }
+}