1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.scxml.env;
18  
19  import java.awt.BorderLayout;
20  import java.awt.Graphics;
21  import java.awt.Image;
22  import java.awt.Toolkit;
23  import java.awt.event.ActionEvent;
24  import java.awt.event.ActionListener;
25  import java.net.URL;
26  import java.util.Timer;
27  import java.util.TimerTask;
28  
29  import javax.swing.JButton;
30  import javax.swing.JFrame;
31  import javax.swing.JLabel;
32  import javax.swing.JPanel;
33  
34  
35  /***
36   * Quick GUI to demonstrate the SCXML driven stopwatch.
37   *
38   * Separation of UI (this class) from behavior (StopWatch class).
39   * UI serves merely as a front to relay user initiated events to StopWatch
40   * object, which encapsulates all the behavior of a stopwatch.
41   * Using SCXML makes the StopWatch class simplistic, and provides a direct
42   * route from the UML model to the runtime.
43   *
44   * @see StopWatch
45   */
46  public class StopWatchDisplay extends JFrame
47          implements ActionListener {
48  
49      private static final long serialVersionUID = 1L;
50      private StopWatch stopWatch;
51      private Image watchImage, watchIcon;
52  
53      public StopWatchDisplay() {
54          super("SCXML stopwatch");
55          stopWatch = new StopWatch();
56          setupUI();
57      }
58  
59      public void actionPerformed(ActionEvent e) {
60          String command = e.getActionCommand();
61          if (command.equals("START")) {
62              if (start.getText().equals("Start")) {
63                  stopWatch.fireEvent(StopWatch.EVENT_START);
64                  start.setText("Stop");
65                  split.setEnabled(true);
66              } else if (start.getText().equals("Stop")) {
67                  stopWatch.fireEvent(StopWatch.EVENT_STOP);
68                  start.setText("Reset");
69                  split.setEnabled(false);
70              } else {
71                  stopWatch.fireEvent(StopWatch.EVENT_RESET);
72                  start.setText("Start");
73                  split.setText("Split");
74              }
75          } else if (command.equals("SPLIT")) {
76              if (split.getText().equals("Split")) {
77                  stopWatch.fireEvent(StopWatch.EVENT_SPLIT);
78                  split.setText("Unsplit");
79              } else {
80                  stopWatch.fireEvent(StopWatch.EVENT_UNSPLIT);
81                  split.setText("Split");
82              }
83          }
84      }
85  
86      private void setupUI() {
87          URL imageURL = this.getClass().getClassLoader().
88              getResource("org/apache/commons/scxml/env/stopwatch.gif");
89          URL iconURL = this.getClass().getClassLoader().
90              getResource("org/apache/commons/scxml/env/stopwatchicon.gif");
91          Toolkit kit = Toolkit.getDefaultToolkit();
92          watchImage = kit.createImage(imageURL);
93          watchIcon = kit.createImage(iconURL);
94          WatchPanel panel = new WatchPanel();
95          panel.setLayout(new BorderLayout());
96          setContentPane(panel);
97          display = new JLabel(stopWatch.getDisplay());
98          panel.add(display, BorderLayout.PAGE_START);
99          start = makeButton("START", "start, stop, reset", "Start");
100         panel.add(start, BorderLayout.LINE_START);
101         state = new JLabel();
102         panel.add(state, BorderLayout.CENTER);
103         split = makeButton("SPLIT", "split, unsplit", "Split");
104         split.setEnabled(false);
105         panel.add(split, BorderLayout.LINE_END);
106         pack();
107         setLocation(200,200);
108         setIconImage(watchIcon);
109         setResizable(false);
110         setSize(300,125);
111         show();
112         setDefaultCloseOperation(EXIT_ON_CLOSE);
113         Timer displayTimer = new Timer();
114         displayTimer.scheduleAtFixedRate(new TimerTask() {
115             public void run() {
116                 display.setText(DISPLAY_PREFIX + stopWatch.getDisplay()
117                     + DISPLAY_SUFFIX);
118                 state.setText(STATE_PREFIX + stopWatch.getCurrentState()
119                     + STATE_SUFFIX);
120             }
121         }, 100, 100);
122     }
123 
124     private JButton makeButton(final String actionCommand,
125             final String toolTipText, final String altText) {
126         JButton button = new JButton(altText);
127         button.setActionCommand(actionCommand);
128         button.setToolTipText(toolTipText);
129         button.addActionListener(this);
130         button.setOpaque(false);
131         return button;
132     }
133 
134     class WatchPanel extends JPanel {
135         private static final long serialVersionUID = 1L;
136 
137         public void paintComponent(Graphics g) {
138             if(watchImage != null) {
139                 g.drawImage(watchImage,0,0,this.getWidth(),this.getHeight(),this);
140             }
141         }
142     }
143 
144     public static void main(String[] args) {
145         StopWatchDisplay stopWatchDisplay = new StopWatchDisplay();
146     }
147 
148     private JLabel display, state;
149     private JButton start, split;
150     // spaces :: GridBagConstraints ;-)
151     private static final String
152         DISPLAY_PREFIX = "<html><font face=\"Courier\" color=\"maroon\"" +
153             " size=\"10\"><b>&nbsp;&nbsp;&nbsp;",
154         DISPLAY_SUFFIX = "</b></font></html>",
155         STATE_PREFIX = "<html><font color=\"blue\" size=\"4\"" +
156             ">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;",
157         STATE_SUFFIX = "</font></html>";
158 
159 }
160