forked from amazingfate/loongoffice
133 lines
4.3 KiB
Java
133 lines
4.3 KiB
Java
/*************************************************************************
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*
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* The Contents of this file are made available subject to the terms of
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* the BSD license.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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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 instanciated 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.
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*/
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public static synchronized void print (String 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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Instance().printMessage (aMessage+"\n");
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}
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public void paintComponent (Graphics g)
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{
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// Synchronize with the graphics object to prevent paint problems.
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// Remember that this is not done by Swing itself.
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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 JTextArea maText;
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}
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