JTextPane 的 undo 、 redo
实现文本框输入内容的单条记录撤销，重做，通过按钮实现
以及通过JList的多条撤销、重做操作（类似PS）
昨天还在为自己写不出代码怎么办而伤心，没想到今天上午就实现了，并且还完善了功能：
可以在撤销一些操作后，继续编辑文本框，同时给Jlist添加渲染。
代码如下：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package UndoText;
import com.sun.media.sound.ModelAbstractChannelMixer;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.DefaultListCellRenderer;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.JToolBar;
import javax.swing.ListSelectionModel;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.UndoableEditEvent;
import javax.swing.event.UndoableEditListener;
import javax.swing.undo.UndoManager;
import javax.swing.undo.UndoableEdit;
/**
*
* @author Administrator
*/
//实现文本框的撤销、重做
public class UndoTextFrame extends JFrame {
JPanel undoListJPanel = new JPanel();
JList undoList = new JList();
JScrollPane undoScrollPane = new JScrollPane(undoList);
DefaultListModel listModel = new DefaultListModel<>();
UndoManager um = new UndoManager();
int[] undoIndexs;
int indexF, indexS;
public UndoTextFrame() {
setTitle("sample");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
setSize(640, 480);
setLocationRelativeTo(this);
getContentPane().add(new textPanel(), BorderLayout.CENTER);
getContentPane().add(undoListPanel(), BorderLayout.WEST);
}
public JPanel undoListPanel() {
undoListJPanel.setLayout(new BorderLayout());
undoList.setModel(listModel);
undoList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
undoList.setFixedCellWidth(100); // undoIndexs = new int[indexS];
undoScrollPane.setPreferredSize(new Dimension(100, 400));
undoScrollPane.setBorder(BorderFactory.createTitledBorder("Undo"));
undoScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
undoScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
undoListJPanel.add(undoScrollPane, BorderLayout.NORTH);
UndoListManager();
return undoListJPanel;
}
public void UndoListManager() {
undoList.addListSelectionListener(new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent lse) {
System.out.println("F:" + indexF);
System.out.println("S:" + indexS);
if (undoList.getValueIsAdjusting()) {
indexS = undoList.getSelectedIndex();
} else {
indexF = undoList.getSelectedIndex();
}
undoIndexs = new int[undoList.getLastVisibleIndex()];
for (int j = 0; j < indexS; j++) {
undoIndexs[j] = undoList.getSelectedIndex();
}
MyRenderer renderer = new MyRenderer(undoIndexs, Color.PINK);
undoList.setCellRenderer(renderer);
if (indexF < indexS) {
for (int i = indexF; i < indexS; i++) {
if (um.canRedo()) {
um.redo();
}
}
} else if (indexF > indexS) {
for (int i = indexF; i > indexS; i--) {
if (um.canUndo()) {
um.undo();
}
}
}
}
});
}
//quesion：textPane setLineCrap
class textPanel extends JPanel {
private JTextPane textPane = new JTextPane();
private JScrollPane scrollTextPane1 = new JScrollPane(textPane);
// private JLabel textTitle = new JLabel("TextPane");
JPanel header = new JPanel();
JToolBar toolBar = new JToolBar();
JButton undoButton = new JButton("undo");
JButton redoButton = new JButton("redo");
public textPanel() {
setLayout(new BorderLayout());
textPane.setEditable(true);
textPane.setToolTipText("textPane");
scrollTextPane1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrollTextPane1.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
toolBar.add(redoButton);
toolBar.add(undoButton);
toolBar.setFloatable(false);
header.setLayout(new BorderLayout());
header.add(toolBar, BorderLayout.CENTER);
add(header, BorderLayout.NORTH);
add(scrollTextPane1, BorderLayout.CENTER);
initAction();
}
public void initAction() {
textPane.getDocument().addUndoableEditListener(new UndoableEditListener() {
@Override
public void undoableEditHappened(UndoableEditEvent uee) {
um.addEdit((UndoableEdit) uee.getEdit());
listModel.addElement(textPane.getText().toString().charAt(textPane.getText().length() - 1));
MyRenderer renderer = new MyRenderer(textPane.getText().length() - 1, Color.yellow);
undoList.setCellRenderer(renderer);
textPane.addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent ke) {
for (int k = indexS + 1; k < undoList.getModel().getSize(); k++) {
listModel.removeElementAt(k);
}
}
});
indexF = listModel.getSize() - 1;
indexS = listModel.getSize() - 1;
}
});
undoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
if (um.canUndo()) {
um.undo();
}
}
});
redoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
if (um.canRedo()) {
um.redo();
}
}
});
}
}
//Jlist render
class MyRenderer extends DefaultListCellRenderer {
private Font font1;
private Font font2;
private Color rowcolor;
private int row;
private int[] rows;
private DefaultListModel model;
public MyRenderer() {
this.font1 = getFont();
this.font2 = font1.deriveFont((float) (font1.getSize() + 10));
}
public MyRenderer(int row, Color color) {
this.rowcolor = color;
this.row = row;
}
public MyRenderer(int[] rows, Color color) {
this.rowcolor = color;
this.rows = rows;
}
public MyRenderer(Color rowcolor, DefaultListModel model) {
this.rowcolor = rowcolor;
this.model = model;
}
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (rows == null) {
if (index == row) {
setBackground(this.rowcolor);
//setFont(getFont().deriveFont((float) (getFont().getSize() + 2)));
}
} else {
for (int i = 0; i < rows.length; i++) {
if (index <= rows[i]) {
setBackground(this.rowcolor);
}
}
}
return this;
}
}
public static void main(String[] args) {
new UndoTextFrame().setVisible(true);
}
}