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package clipborad;

import javax.swing.JTextArea;

import java.awt.datatransfer.*;

import java.awt.*;

import javax.swing.*;

import java.io.*;

import javax.swing.undo.*;

http://www.gaodaima.com/64851.html用JAVA实现Undo、Redo,Copy、Paste、Cut_java

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());

}

}

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