useactions.java

The Definitive Guide to Java Swing, Third Edition by John Zukowski (Author) 源码

import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

public class UseActions {
  public static void main(String args[]) {
    Runnable runner = new Runnable() {
      public void run() {
        JFrame frame = new JFrame("Use TextAction");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Dimension empty = new Dimension(0,0);

        final JTextArea leftArea = new JTextArea();
        JScrollPane leftScrollPane = new JScrollPane(leftArea);
        leftScrollPane.setPreferredSize(empty);

        final JTextArea rightArea = new JTextArea();
        JScrollPane rightScrollPane = new JScrollPane(rightArea);
        rightScrollPane.setPreferredSize(empty);

        JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, 
          leftScrollPane, rightScrollPane);

        JMenuBar menuBar = new JMenuBar();
        frame.setJMenuBar(menuBar);
        JMenu menu = new JMenu("Options");
        menuBar.add(menu);
        JMenuItem menuItem;

        Action readAction =
          leftArea.getActionMap().get(DefaultEditorKit.readOnlyAction);
        menuItem = menu.add(readAction);
        menuItem.setText("Make read-only");
        Action writeAction  =
          leftArea.getActionMap().get(DefaultEditorKit.writableAction);
        menuItem = menu.add(writeAction);
        menuItem.setText("Make writable");

        menu.addSeparator();

        Action cutAction =
          leftArea.getActionMap().get(DefaultEditorKit.cutAction);
        menuItem = menu.add(cutAction);
        menuItem.setText("Cut");
        Action copyAction =
          leftArea.getActionMap().get(DefaultEditorKit.copyAction);
        menuItem = menu.add(copyAction);
        menuItem.setText("Copy");
        Action pasteAction =
          leftArea.getActionMap().get(DefaultEditorKit.pasteAction);
        menuItem = menu.add(pasteAction);
        menuItem.setText("Paste");

        frame.add(splitPane, BorderLayout.CENTER);
        frame.setSize(400, 250);
        frame.setVisible(true);
        splitPane.setDividerLocation(.5);
      }
    };
    EventQueue.invokeLater(runner);
  }
}