cutandpaste.java

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//: c14:CutAndPaste.java
// Using the clipboard.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
import com.bruceeckel.swing.*;

public class CutAndPaste extends JFrame  {
  private JMenuBar mb = new JMenuBar();
  private JMenu edit = new JMenu("Edit");
  private JMenuItem
    cut = new JMenuItem("Cut"),
    copy = new JMenuItem("Copy"),
    paste = new JMenuItem("Paste");
  private JTextArea text = new JTextArea(20, 20);
  private Clipboard clipbd =
    getToolkit().getSystemClipboard();
  public CutAndPaste()  {
    cut.addActionListener(new CutL());
    copy.addActionListener(new CopyL());
    paste.addActionListener(new PasteL());
    edit.add(cut);
    edit.add(copy);
    edit.add(paste);
    mb.add(edit);
    setJMenuBar(mb);
    getContentPane().add(text);
  }
  class CopyL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      String selection = text.getSelectedText();
      if(selection == null)
        return;
      StringSelection clipString =
        new StringSelection(selection);
      clipbd.setContents(clipString,clipString);
    }
  }
  class CutL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      String selection = text.getSelectedText();
      if(selection == null)
        return;
      StringSelection clipString =
        new StringSelection(selection);
      clipbd.setContents(clipString, clipString);
      text.replaceRange("", text.getSelectionStart(),
        text.getSelectionEnd());
    }
  }
  class PasteL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      Transferable clipData =
        clipbd.getContents(CutAndPaste.this);
      try {
        String clipString = (String)clipData.
          getTransferData(DataFlavor.stringFlavor);
        text.replaceRange(clipString,
          text.getSelectionStart(),text.getSelectionEnd());
      } catch(Exception ex) {
        System.err.println("Not String flavor");
      }
    }
  }
  public static void main(String[] args) {
    Console.run(new CutAndPaste(), 300, 200);
  }
} ///:~