plugin/oji/MRJ/testing/TrivialApplet/TrivialApplet.java

   1 /*
   2         Trivial applet that displays a string - 4/96 PNL
   3 */
   4
   5 import java.awt.*;
   6 import java.awt.event.*;
   7 import java.applet.Applet;
   8 import java.net.URL;
   9 import java.net.MalformedURLException;
  10
  11 import netscape.javascript.JSObject;
  12
  13 class AboutBox extends Frame {
  14         AboutBox(Menu aboutMenu, ActionListener[] actionListeners) {
  15                 super("About Applet");
  16
  17                 addWindowListener(
  18                         new WindowAdapter() {
  19                                 public void windowClosing(WindowEvent e) {
  20                                         dispose();
  21                                 }
  22                         });
  23
  24                 Button okButton = new Button("OK");
  25                 okButton.addActionListener(
  26                         new ActionListener() {
  27                                 public void actionPerformed(ActionEvent e) {
  28                                         dispose();
  29                                 }
  30                         });
  31
  32                 // Annoying use of flow layout managers.
  33                 Panel labelPanel = new Panel();
  34                 Panel buttonPanel = new Panel();
  35                 Panel fieldPanel = new Panel();
  36
  37                 labelPanel.add(new Label("This applet's about box..."));
  38                 buttonPanel.add(okButton);
  39
  40                 fieldPanel.add(new TextField(20));
  41                 fieldPanel.add(new TextField(20));
  42
  43                 add(labelPanel, "North");
  44                 add(buttonPanel, "Center");
  45                 add(fieldPanel, "South");
  46
  47                 // test menu bar stuff.
  48                 MenuBar menuBar = new MenuBar();
  49                 aboutMenu = (Menu) cloneMenu(aboutMenu);
  50                 for (int i = 0; i < actionListeners.length; i++)
  51                         aboutMenu.getItem(i).addActionListener(actionListeners[i]);
  52                 menuBar.add(aboutMenu);
  53                 setMenuBar(menuBar);
  54
  55                 pack();
  56                 show();
  57         }
  58
  59         private MenuItem cloneMenu(MenuItem oldItem) {
  60                 if (oldItem instanceof Menu) {
  61                         Menu oldMenu = (Menu) oldItem;
  62                         Menu newMenu = new Menu(oldMenu.getLabel());
  63                         int count = oldMenu.getItemCount();
  64                         for (int i = 0; i < count; i++) {
  65                                 newMenu.add(cloneMenu(oldMenu.getItem(i)));
  66                         }
  67                         return newMenu;
  68                 } else {
  69                         MenuItem newItem = new MenuItem(oldItem.getLabel());
  70                         return newItem;
  71                 }
  72         }
  73 }
  74
  75 class ExceptionThread extends Thread {
  76         ExceptionThread() {
  77                 start();
  78         }
  79
  80         public void run() {
  81                 throw new Error("this is an error!");
  82         }
  83 }
  84
  85 public class TrivialApplet extends Applet {
  86         public Button goButton;
  87         public Button aboutButton;
  88         public TextField urlField;
  89         public PopupMenu contextMenu;
  90         public Menu aboutMenu;
  91         public ActionListener[] actionListeners;
  92         private static int appletCount;
  93
  94         public void init() {
  95                 ++appletCount;
  96
  97                 goButton = new Button("Go");
  98                 aboutButton = new Button("About");
  99
 100                 String urlText = getParameter("URL");
 101                 if (urlText == null)
 102                         urlText = "http://www.apple.com";
 103
 104                 urlField = new TextField(urlText);
 105
 106                 ActionListener goListener =
 107                         new ActionListener() {
 108                                 public void actionPerformed(ActionEvent e) {
 109                                         try {
 110                                                 URL location = new URL(urlField.getText());
 111                                                 System.out.println("going to URL: " + location);
 112                                                 JSObject window = JSObject.getWindow(TrivialApplet.this);
 113                                                 if (window != null) {
 114                                                         //window.eval("alert('going to location " + location + "');");
 115                                                         window.eval("println('" + location + "')");
 116                                                 }
 117                                                 getAppletContext().showDocument(location, "_new");
 118                                         } catch (MalformedURLException mfue) {
 119                                         }
 120                                 }
 121                         };
 122
 123                 ActionListener aboutListener =
 124                         new ActionListener() {
 125                                 public void actionPerformed(ActionEvent e) {
 126                                         new AboutBox(aboutMenu, actionListeners);
 127                                 }
 128                         };
 129
 130                 goButton.addActionListener(goListener);
 131                 aboutButton.addActionListener(aboutListener);
 132
 133                 add(goButton);
 134                 add(aboutButton);
 135                 add(urlField);
 136
 137                 // Try a pop-up menu, and a menu in the menubar.
 138                 contextMenu = new PopupMenu();
 139                 aboutMenu = new Menu("About");
 140
 141                 contextMenu.add(newItem("About", aboutListener));
 142                 aboutMenu.add(newItem("About", aboutListener));
 143
 144                 contextMenu.add(newItem("Go", goListener));
 145                 aboutMenu.add(newItem("Go", goListener));
 146
 147                 ActionListener errorListener = new ActionListener() {
 148                                 public void actionPerformed(ActionEvent e) {
 149                                         new ExceptionThread();
 150                                 }
 151                         };
 152                 contextMenu.add(newItem("Error", errorListener));
 153                 aboutMenu.add(newItem("Error", errorListener));
 154
 155                 ActionListener[] listeners = { aboutListener, goListener, errorListener };
 156                 actionListeners = listeners;
 157
 158                 add(contextMenu);
 159
 160                 // add a mouse listener that causes the pop-up to appear appropriately.
 161                 MouseListener mouseListener = new MouseAdapter() {
 162                         public void mousePressed(MouseEvent e) {
 163                                 if (e.isPopupTrigger()) {
 164                                         e.consume();
 165                                         contextMenu.show(TrivialApplet.this, e.getX(), e.getY());
 166                                 }
 167                         }
 168                 };
 169
 170                 addMouseListener(mouseListener);
 171         }
 172
 173         private MenuItem newItem(String title, ActionListener listener) {
 174                 MenuItem item = new MenuItem(title);
 175                 item.addActionListener(listener);
 176                 return item;
 177         }
 178
 179         private Frame getFrame() {
 180                 Component p = this;
 181                 while (p != null && !(p instanceof Frame))
 182                         p = getParent();
 183                 return (Frame)p;
 184         }
 185
 186         // public void paint( Graphics g ) {}
 187
 188     public boolean mouseEnter(Event evt, int x, int y) {
 189         showStatus("Welcome!");
 190                 return true;
 191     }
 192
 193     public boolean mouseExit(Event evt, int x, int y) {
 194         showStatus("See you later!");
 195                 return true;
 196     }
 197
 198         public void print(String message) {
 199                 JSObject window = JSObject.getWindow(this);
 200                 Object[] args = { message };
 201                 window.call("println", args);
 202     }
 203
 204     public int getAppletCount() {
 205         return appletCount;
 206     }
 207 }