131 lines
3.5 KiB
Java
131 lines
3.5 KiB
Java
/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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import java.awt.Font;
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import java.awt.Color;
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import java.awt.Graphics;
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import javax.swing.JScrollPane;
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import javax.swing.JTextArea;
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import javax.swing.JScrollBar;
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/** A message area displays text in a scrollable text widget. It is a
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singleton. Other objects can access it directly to display messages.
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*/
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public class MessageArea
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extends JScrollPane
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{
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public static synchronized MessageArea Instance ()
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{
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if (saInstance == null)
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saInstance = new MessageArea ();
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return saInstance;
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}
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/** Create a new message area. This method is private because the class is
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a singleton and may therefore not be instantiated from the outside.
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*/
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private MessageArea ()
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{
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maText = new JTextArea();
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maText.setBackground (new Color (255,250,240));
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maText.setFont (new Font ("Helvetica", Font.PLAIN, 9));
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setViewportView (maText);
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setVerticalScrollBarPolicy (JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
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setHorizontalScrollBarPolicy (JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
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printMessage (
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"class path is " + System.getProperty ("java.class.path") + "\n");
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}
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/** Show the given string at the end of the message area and scroll to make
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it visible. Indent the string as requested.
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*/
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private static synchronized void print (int nIndentation, String aMessage)
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{
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while (nIndentation-- > 0) {
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aMessage = " " + aMessage;
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}
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Instance().printMessage(aMessage);
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}
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/** Show the given string at the end of the message area and scroll to make
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it visible.
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*/
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public static void println (String aMessage)
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{
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println (0, aMessage);
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}
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/** Show the given string at the end of the message area and scroll to make
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it visible.
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*/
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private static void println (int nIndentation, String aMessage)
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{
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print (nIndentation, aMessage+"\n");
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}
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@Override
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public void paintComponent (Graphics g)
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{
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synchronized (g)
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{
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JScrollBar sb = getVerticalScrollBar();
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if (sb != null)
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{
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int nScrollBarValue = sb.getMaximum() - sb.getVisibleAmount() - 1;
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sb.setValue (nScrollBarValue);
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}
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super.paintComponent (g);
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}
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}
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/** Append the given string to the end of the text and scroll so that it
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becomes visible. This is an internal method. Use one of the static
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and public ones.
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*/
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private synchronized void printMessage (String aMessage)
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{
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maText.append (aMessage);
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}
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private static MessageArea saInstance = null;
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private final JTextArea maText;
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}
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