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