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+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+import java.awt.Font;
+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 instantiated 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. Indent the string as requested.
+ */
+ private static synchronized void print (int nIndentation, String aMessage)
+ {
+ while (nIndentation-- > 0) {
+ aMessage = " " + 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)
+ {
+ println (0, aMessage);
+ }
+
+
+
+
+ /** Show the given string at the end of the message area and scroll to make
+ it visible.
+ */
+ private static void println (int nIndentation, String aMessage)
+ {
+ print (nIndentation, aMessage+"\n");
+ }
+
+
+
+
+ @Override
+ public void paintComponent (Graphics g)
+ {
+ 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 final JTextArea maText;
+}