corejava第10版

corejava第10版/v1ch12/menu/MenuFrame.java

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+package menu;
+
+import java.awt.event.*;
+import javax.swing.*;
+
+/**
+ * A frame with a sample menu bar.
+ */
+public class MenuFrame extends JFrame
+{
+   private static final int DEFAULT_WIDTH = 300;
+   private static final int DEFAULT_HEIGHT = 200;
+   private Action saveAction;
+   private Action saveAsAction;
+   private JCheckBoxMenuItem readonlyItem;
+   private JPopupMenu popup;
+
+   /**
+    * A sample action that prints the action name to System.out
+    */
+   class TestAction extends AbstractAction
+   {
+      public TestAction(String name)
+      {
+         super(name);
+      }
+
+      public void actionPerformed(ActionEvent event)
+      {
+         System.out.println(getValue(Action.NAME) + " selected.");
+      }
+   }
+
+   public MenuFrame()
+   {
+      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
+
+      JMenu fileMenu = new JMenu("File");
+      fileMenu.add(new TestAction("New"));
+
+      // demonstrate accelerators
+
+      JMenuItem openItem = fileMenu.add(new TestAction("Open"));
+      openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));
+
+      fileMenu.addSeparator();
+
+      saveAction = new TestAction("Save");
+      JMenuItem saveItem = fileMenu.add(saveAction);
+      saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));
+
+      saveAsAction = new TestAction("Save As");
+      fileMenu.add(saveAsAction);
+      fileMenu.addSeparator();
+
+      fileMenu.add(new AbstractAction("Exit")
+         {
+            public void actionPerformed(ActionEvent event)
+            {
+               System.exit(0);
+            }
+         });
+
+      // demonstrate checkbox and radio button menus
+
+      readonlyItem = new JCheckBoxMenuItem("Read-only");
+      readonlyItem.addActionListener(new ActionListener()
+         {
+            public void actionPerformed(ActionEvent event)
+            {
+               boolean saveOk = !readonlyItem.isSelected();
+               saveAction.setEnabled(saveOk);
+               saveAsAction.setEnabled(saveOk);
+            }
+         });
+
+      ButtonGroup group = new ButtonGroup();
+
+      JRadioButtonMenuItem insertItem = new JRadioButtonMenuItem("Insert");
+      insertItem.setSelected(true);
+      JRadioButtonMenuItem overtypeItem = new JRadioButtonMenuItem("Overtype");
+
+      group.add(insertItem);
+      group.add(overtypeItem);
+
+      // demonstrate icons
+
+      Action cutAction = new TestAction("Cut");
+      cutAction.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
+      Action copyAction = new TestAction("Copy");
+      copyAction.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
+      Action pasteAction = new TestAction("Paste");
+      pasteAction.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));
+
+      JMenu editMenu = new JMenu("Edit");
+      editMenu.add(cutAction);
+      editMenu.add(copyAction);
+      editMenu.add(pasteAction);
+
+      // demonstrate nested menus
+
+      JMenu optionMenu = new JMenu("Options");
+
+      optionMenu.add(readonlyItem);
+      optionMenu.addSeparator();
+      optionMenu.add(insertItem);
+      optionMenu.add(overtypeItem);
+
+      editMenu.addSeparator();
+      editMenu.add(optionMenu);
+
+      // demonstrate mnemonics
+
+      JMenu helpMenu = new JMenu("Help");
+      helpMenu.setMnemonic('H');
+
+      JMenuItem indexItem = new JMenuItem("Index");
+      indexItem.setMnemonic('I');
+      helpMenu.add(indexItem);
+
+      // you can also add the mnemonic key to an action
+      Action aboutAction = new TestAction("About");
+      aboutAction.putValue(Action.MNEMONIC_KEY, new Integer('A'));
+      helpMenu.add(aboutAction);
+      
+      // add all top-level menus to menu bar
+
+      JMenuBar menuBar = new JMenuBar();
+      setJMenuBar(menuBar);
+
+      menuBar.add(fileMenu);
+      menuBar.add(editMenu);
+      menuBar.add(helpMenu);
+
+      // demonstrate pop-ups
+
+      popup = new JPopupMenu();
+      popup.add(cutAction);
+      popup.add(copyAction);
+      popup.add(pasteAction);
+
+      JPanel panel = new JPanel();
+      panel.setComponentPopupMenu(popup);
+      add(panel);
+   }
+}