programlover原作

package clipborad;

import javax.swing.JTextArea;
import java.awt.datatransfer.*;
import java.awt.*;
import javax.swing.*;
import java.io.*;
import javax.swing.undo.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.awt.event.*;
/**
* Title: 用JAVA实现Undo、Redo,Copy、Paste、Cut
* Description:用JAVA实现Undo、Redo,Copy、Paste、Cut
* Copyright: Copyright (c) 2001
* Company:
* @author: 彭建雄
* @version 1.0
*/

public class ClipTextArea extends JTextArea implements ClipboardOwner{

Clipboard strBoard = this.getToolkit().getSystemClipboard();
UndoManager undo = new UndoManager();
Document doc = getDocument();



public ClipTextArea() {
doc.addUndoableEditListener(new UndoableEditListener(){
public void undoableEditHappened(UndoableEditEvent e) {
doc_addedit(e);}
});

addActionMap();
}

public void addActionMap()
{
getActionMap().put("Undo", new AbstractAction("Undo") {
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canUndo()) {
undo.undo();
}
} catch (CannotUndoException e) {
}
}
});
getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");

getActionMap().put("Redo",new AbstractAction("Redo") {
public void actionPerformed(ActionEvent evt) {
try
{
if (undo.canRedo()) {
undo.redo();
}
} catch (CannotRedoException e) {
}
}
});
getInputMap().put(KeyStroke.getKeyStroke("control R"), "Redo");

getActionMap().put("Copy",new AbstractAction("Copy") {
public void actionPerformed(ActionEvent evt) {
copy();
}
});
getInputMap().put(KeyStroke.getKeyStroke("control C"), "Copy");

getActionMap().put("Cut",new AbstractAction("Cut") {
public void actionPerformed(ActionEvent evt) {
cut();
}
});
getInputMap().put(KeyStroke.getKeyStroke("control X"), "Cut");

getActionMap().put("Paste",new AbstractAction("Paste") {
public void actionPerformed(ActionEvent evt) {
paste();
}
});
getInputMap().put(KeyStroke.getKeyStroke("control V"), "Paste");

}


public void copy()
{
String sCopy = getSelectedText();
if (sCopy != null)
{
StringSelection sSelection = new StringSelection(sCopy);
strBoard.setContents(sSelection,this);
}
}

public void cut()
{
String sCopy = getSelectedText();
if (sCopy != null)
{
StringSelection sSelection = new StringSelection(sCopy);
strBoard.setContents(sSelection,this);
this.replaceSelection("");
}
}

public void paste()
{
Transferable sTransf = strBoard.getContents(this);
if (sTransf!=null)
{
try
{
String sPaste = (String)sTransf.getTransferData(DataFlavor.stringFlavor);
this.replaceRange(sPaste,getSelectionStart(),getSelectionEnd());
}
catch(UnsupportedFlavorException e)
{
}
catch(IOException ioe)
{
}
}
}


public void lostOwnership(Clipboard clipboard,Transferable contents)
{

}

void doc_addedit(UndoableEditEvent e)
{
undo.addEdit(e.getEdit());
}

}