1*b1cdbd2cSJim Jagielski /************************************************************** 2*b1cdbd2cSJim Jagielski * 3*b1cdbd2cSJim Jagielski * Licensed to the Apache Software Foundation (ASF) under one 4*b1cdbd2cSJim Jagielski * or more contributor license agreements. See the NOTICE file 5*b1cdbd2cSJim Jagielski * distributed with this work for additional information 6*b1cdbd2cSJim Jagielski * regarding copyright ownership. The ASF licenses this file 7*b1cdbd2cSJim Jagielski * to you under the Apache License, Version 2.0 (the 8*b1cdbd2cSJim Jagielski * "License"); you may not use this file except in compliance 9*b1cdbd2cSJim Jagielski * with the License. You may obtain a copy of the License at 10*b1cdbd2cSJim Jagielski * 11*b1cdbd2cSJim Jagielski * http://www.apache.org/licenses/LICENSE-2.0 12*b1cdbd2cSJim Jagielski * 13*b1cdbd2cSJim Jagielski * Unless required by applicable law or agreed to in writing, 14*b1cdbd2cSJim Jagielski * software distributed under the License is distributed on an 15*b1cdbd2cSJim Jagielski * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16*b1cdbd2cSJim Jagielski * KIND, either express or implied. See the License for the 17*b1cdbd2cSJim Jagielski * specific language governing permissions and limitations 18*b1cdbd2cSJim Jagielski * under the License. 19*b1cdbd2cSJim Jagielski * 20*b1cdbd2cSJim Jagielski *************************************************************/ 21*b1cdbd2cSJim Jagielski 22*b1cdbd2cSJim Jagielski import java.awt.Font; 23*b1cdbd2cSJim Jagielski import java.awt.Rectangle; 24*b1cdbd2cSJim Jagielski import java.awt.Color; 25*b1cdbd2cSJim Jagielski import java.awt.Graphics; 26*b1cdbd2cSJim Jagielski import javax.swing.JScrollPane; 27*b1cdbd2cSJim Jagielski import javax.swing.JTextArea; 28*b1cdbd2cSJim Jagielski import javax.swing.JScrollBar; 29*b1cdbd2cSJim Jagielski 30*b1cdbd2cSJim Jagielski 31*b1cdbd2cSJim Jagielski 32*b1cdbd2cSJim Jagielski /** A message area displays text in a scrollable text widget. It is a 33*b1cdbd2cSJim Jagielski singleton. Other objects can access it directly to display messages. 34*b1cdbd2cSJim Jagielski */ 35*b1cdbd2cSJim Jagielski public class MessageArea 36*b1cdbd2cSJim Jagielski extends JScrollPane 37*b1cdbd2cSJim Jagielski { Instance()38*b1cdbd2cSJim Jagielski public static synchronized MessageArea Instance () 39*b1cdbd2cSJim Jagielski { 40*b1cdbd2cSJim Jagielski if (saInstance == null) 41*b1cdbd2cSJim Jagielski saInstance = new MessageArea (); 42*b1cdbd2cSJim Jagielski return saInstance; 43*b1cdbd2cSJim Jagielski } 44*b1cdbd2cSJim Jagielski 45*b1cdbd2cSJim Jagielski 46*b1cdbd2cSJim Jagielski 47*b1cdbd2cSJim Jagielski 48*b1cdbd2cSJim Jagielski /** Create a new message area. This method is private because the class is 49*b1cdbd2cSJim Jagielski a singleton and may therefore not be instanciated from the outside. 50*b1cdbd2cSJim Jagielski */ MessageArea()51*b1cdbd2cSJim Jagielski private MessageArea () 52*b1cdbd2cSJim Jagielski { 53*b1cdbd2cSJim Jagielski maText = new JTextArea(); 54*b1cdbd2cSJim Jagielski maText.setBackground (new Color (255,250,240)); 55*b1cdbd2cSJim Jagielski maText.setFont (new Font ("Helvetica", Font.PLAIN, 9)); 56*b1cdbd2cSJim Jagielski setViewportView (maText); 57*b1cdbd2cSJim Jagielski setVerticalScrollBarPolicy (JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); 58*b1cdbd2cSJim Jagielski setHorizontalScrollBarPolicy (JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); 59*b1cdbd2cSJim Jagielski 60*b1cdbd2cSJim Jagielski printMessage ( 61*b1cdbd2cSJim Jagielski "class path is " + System.getProperty ("java.class.path") + "\n"); 62*b1cdbd2cSJim Jagielski } 63*b1cdbd2cSJim Jagielski 64*b1cdbd2cSJim Jagielski 65*b1cdbd2cSJim Jagielski 66*b1cdbd2cSJim Jagielski 67*b1cdbd2cSJim Jagielski /** Show the given string at the end of the message area and scroll to make 68*b1cdbd2cSJim Jagielski it visible. 69*b1cdbd2cSJim Jagielski */ print(String aMessage)70*b1cdbd2cSJim Jagielski public static synchronized void print (String aMessage) 71*b1cdbd2cSJim Jagielski { 72*b1cdbd2cSJim Jagielski print (0, aMessage); 73*b1cdbd2cSJim Jagielski } 74*b1cdbd2cSJim Jagielski 75*b1cdbd2cSJim Jagielski 76*b1cdbd2cSJim Jagielski 77*b1cdbd2cSJim Jagielski 78*b1cdbd2cSJim Jagielski /** Show the given string at the end of the message area and scroll to make 79*b1cdbd2cSJim Jagielski it visible. Indent the string as requested. 80*b1cdbd2cSJim Jagielski */ print(int nIndentation, String aMessage)81*b1cdbd2cSJim Jagielski public static synchronized void print (int nIndentation, String aMessage) 82*b1cdbd2cSJim Jagielski { 83*b1cdbd2cSJim Jagielski while (nIndentation-- > 0) 84*b1cdbd2cSJim Jagielski aMessage = " " + aMessage; 85*b1cdbd2cSJim Jagielski Instance().printMessage(aMessage); 86*b1cdbd2cSJim Jagielski } 87*b1cdbd2cSJim Jagielski 88*b1cdbd2cSJim Jagielski 89*b1cdbd2cSJim Jagielski 90*b1cdbd2cSJim Jagielski 91*b1cdbd2cSJim Jagielski /** Show the given string at the end of the message area and scroll to make 92*b1cdbd2cSJim Jagielski it visible. 93*b1cdbd2cSJim Jagielski */ println(String aMessage)94*b1cdbd2cSJim Jagielski public static void println (String aMessage) 95*b1cdbd2cSJim Jagielski { 96*b1cdbd2cSJim Jagielski println (0, aMessage); 97*b1cdbd2cSJim Jagielski } 98*b1cdbd2cSJim Jagielski 99*b1cdbd2cSJim Jagielski 100*b1cdbd2cSJim Jagielski 101*b1cdbd2cSJim Jagielski 102*b1cdbd2cSJim Jagielski /** Show the given string at the end of the message area and scroll to make 103*b1cdbd2cSJim Jagielski it visible. 104*b1cdbd2cSJim Jagielski */ println(int nIndentation, String aMessage)105*b1cdbd2cSJim Jagielski public static void println (int nIndentation, String aMessage) 106*b1cdbd2cSJim Jagielski { 107*b1cdbd2cSJim Jagielski print (nIndentation, aMessage+"\n"); 108*b1cdbd2cSJim Jagielski } 109*b1cdbd2cSJim Jagielski 110*b1cdbd2cSJim Jagielski 111*b1cdbd2cSJim Jagielski 112*b1cdbd2cSJim Jagielski paintComponent(Graphics g)113*b1cdbd2cSJim Jagielski public void paintComponent (Graphics g) 114*b1cdbd2cSJim Jagielski { 115*b1cdbd2cSJim Jagielski synchronized (g) 116*b1cdbd2cSJim Jagielski { 117*b1cdbd2cSJim Jagielski JScrollBar sb = getVerticalScrollBar(); 118*b1cdbd2cSJim Jagielski if (sb != null) 119*b1cdbd2cSJim Jagielski { 120*b1cdbd2cSJim Jagielski int nScrollBarValue = sb.getMaximum() - sb.getVisibleAmount() - 1; 121*b1cdbd2cSJim Jagielski sb.setValue (nScrollBarValue); 122*b1cdbd2cSJim Jagielski } 123*b1cdbd2cSJim Jagielski super.paintComponent (g); 124*b1cdbd2cSJim Jagielski } 125*b1cdbd2cSJim Jagielski } 126*b1cdbd2cSJim Jagielski 127*b1cdbd2cSJim Jagielski 128*b1cdbd2cSJim Jagielski 129*b1cdbd2cSJim Jagielski 130*b1cdbd2cSJim Jagielski /** Append the given string to the end of the text and scroll so that it 131*b1cdbd2cSJim Jagielski becomes visible. This is an internal method. Use one of the static 132*b1cdbd2cSJim Jagielski and public ones. 133*b1cdbd2cSJim Jagielski */ printMessage(String aMessage)134*b1cdbd2cSJim Jagielski private synchronized void printMessage (String aMessage) 135*b1cdbd2cSJim Jagielski { 136*b1cdbd2cSJim Jagielski maText.append (aMessage); 137*b1cdbd2cSJim Jagielski } 138*b1cdbd2cSJim Jagielski 139*b1cdbd2cSJim Jagielski 140*b1cdbd2cSJim Jagielski 141*b1cdbd2cSJim Jagielski 142*b1cdbd2cSJim Jagielski private static MessageArea saInstance = null; 143*b1cdbd2cSJim Jagielski private JTextArea maText; 144*b1cdbd2cSJim Jagielski } 145