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+/*************************************************************************
+ *
+ * The Contents of this file are made available subject to the terms of
+ * the BSD license.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Sun Microsystems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *************************************************************************/
+
+import java.awt.Font;
+import java.awt.Rectangle;
+import java.awt.Color;
+import java.awt.Graphics;
+import javax.swing.JScrollPane;
+import javax.swing.JTextArea;
+import javax.swing.JScrollBar;
+
+
+
+/** A message area displays text in a scrollable text widget. It is a
+ singleton. Other objects can access it directly to display messages.
+*/
+public class MessageArea
+ extends JScrollPane
+{
+ public static synchronized MessageArea Instance ()
+ {
+ if (saInstance == null)
+ saInstance = new MessageArea ();
+ return saInstance;
+ }
+
+
+
+
+ /** Create a new message area. This method is private because the class is
+ a singleton and may therefore not be instanciated from the outside.
+ */
+ private MessageArea ()
+ {
+ maText = new JTextArea();
+ maText.setBackground (new Color (255,250,240));
+ maText.setFont (new Font ("Helvetica", Font.PLAIN, 9));
+ setViewportView (maText);
+ setVerticalScrollBarPolicy (JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+ setHorizontalScrollBarPolicy (JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
+
+ printMessage (
+ "class path is " + System.getProperty ("java.class.path") + "\n");
+ }
+
+
+
+
+ /** Show the given string at the end of the message area and scroll to make
+ it visible.
+ */
+ public static synchronized void print (String aMessage)
+ {
+ Instance().printMessage(aMessage);
+ }
+
+
+
+
+ /** Show the given string at the end of the message area and scroll to make
+ it visible.
+ */
+ public static void println (String aMessage)
+ {
+ Instance().printMessage (aMessage+"\n");
+ }
+
+
+ public void paintComponent (Graphics g)
+ {
+ // Synchronize with the graphics object to prevent paint problems.
+ // Remember that this is not done by Swing itself.
+ synchronized (g)
+ {
+ JScrollBar sb = getVerticalScrollBar();
+ if (sb != null)
+ {
+ int nScrollBarValue = sb.getMaximum() - sb.getVisibleAmount() - 1;
+ sb.setValue (nScrollBarValue);
+ }
+ super.paintComponent (g);
+ }
+ }
+
+
+
+
+ /** Append the given string to the end of the text and scroll so that it
+ becomes visible. This is an internal method. Use one of the static
+ and public ones.
+ */
+ private synchronized void printMessage (String aMessage)
+ {
+ maText.append (aMessage);
+ }
+
+
+
+
+ private static MessageArea saInstance = null;
+ private JTextArea maText;
+}