我希望所有已打开的文档的工作功能不是当前打开的文档。我创建了一个swing应用程序。我打开了一份文件。通过menuItem的剪切，复制，粘贴和selectAll操作适用于当前打开的文档;不适用于以前打开的文档。请帮帮我。
这是我的代码：
public class OpenDemo extends javax.swing.JFrame implements ChangeListener{
JTextPane textPane;
JTextPane lnNum;
JScrollPane scrollPane;
int i=0;
JTextField status;
ArrayList<JTextPane> textPanes=new ArrayList<>();
public OpenDemo() {
initComponents();
viewLineNumbers.setSelected(false);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tp = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
open = new javax.swing.JMenuItem();
cut = new javax.swing.JMenuItem();
selectAll = new javax.swing.JMenuItem();
viewLineNumbers = new javax.swing.JCheckBoxMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jMenu1.setText("File");
open.setText("Open");
open.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
openActionPerformed(evt);
}
});
jMenu1.add(open);
cut.setText("Cut");
cut.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
cutActionPerformed(evt);
}
});
jMenu1.add(cut);
selectAll.setText("SelectAll");
selectAll.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
selectAllActionPerformed(evt);
}
});
jMenu1.add(selectAll);
viewLineNumbers.setSelected(true);
viewLineNumbers.setText("ViewLineNumbers");
viewLineNumbers.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
viewLineNumbersActionPerformed(evt);
}
});
jMenu1.add(viewLineNumbers);
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void updateStatus(int linenumber, int columnnumber) {
status.setText("Line: " + linenumber + " Column: " + columnnumber);
}
private void openActionPerformed(java.awt.event.ActionEvent evt) {
FileDialog fd = new FileDialog(OpenDemo.this, "Select File", FileDialog.LOAD);
fd.show();
String title;
String sts;
File f;
if (fd.getFile() != null) {
sts = fd.getDirectory() + fd.getFile();
title=fd.getFile();
System.out.println(sts);
title=fd.getFile();
BufferedReader br = null;
StringBuffer str = new StringBuffer("");
try {
br = new BufferedReader(new FileReader(sts));
String line;
try {
while ((line = br.readLine()) != null) {
str.append(line + "\n");
}
} catch (IOException ex) {
Logger.getLogger(OpenDemo.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (FileNotFoundException ex) {
Logger.getLogger(OpenDemo.class.getName()).log(Level.SEVERE, null, ex);
}
String t = str.toString();
final JInternalFrame internalFrame = new JInternalFrame("",true,true);
textPane = new JTextPane();
textPane.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
internalFrame.add(textPane);
i++;
internalFrame.setName("Doc "+i);
internalFrame.setTitle(title);
try {
internalFrame.setSelected(true);
} catch (PropertyVetoException ex) {
Logger.getLogger(OpenDemo.class.getName()).log(Level.SEVERE, null, ex);
}
textPane.addCaretListener(new CaretListener() {
@Override
public void caretUpdate(CaretEvent e) {
JTextPane editArea = (JTextPane)e.getSource();
int linenum = 1;
int columnnum = 1;
try {
int caretpos = editArea.getCaretPosition();
linenum=getLineAtCaret(editArea)-1;
columnnum=getColumnAtCaret(editArea);
linenum += 1;
}
catch(Exception ex) { }
updateStatus(linenum, columnnum);
}
});
status=new JTextField();
status.setBackground(Color.LIGHT_GRAY);
internalFrame.add(status,BorderLayout.SOUTH);
tp.add(internalFrame);
scrollPane=new JScrollPane(textPane);
tp.setSelectedIndex(i-1);
internalFrame.add(scrollPane);
internalFrame.setVisible(true);
textPane.setText(t);
tp.addChangeListener(this);
textPanes.add(textPane);
textPane.setCaretPosition(0);
}
}
private void cutActionPerformed(java.awt.event.ActionEvent evt) {
textPane.cut();
}
private void selectAllActionPerformed(java.awt.event.ActionEvent evt) {
textPane.selectAll();
}
private void viewLineNumbersActionPerformed(java.awt.event.ActionEvent evt) {
AbstractButton button = (AbstractButton) evt.getSource();
if(button.isSelected()){
lnNum = new JTextPane();
lnNum.setEditable(false);
lnNum.setSize(50,50);
lnNum.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
lnNum.setText(getText());
textPane.getDocument().addDocumentListener(new DocumentListener(){
@Override
public void changedUpdate(DocumentEvent de) {
lnNum.setText(getText());
}
@Override
public void insertUpdate(DocumentEvent de) {
lnNum.setText(getText());
}
@Override
public void removeUpdate(DocumentEvent de) {
lnNum.setText(getText());
}
});
scrollPane.getViewport().add(textPane);
scrollPane.setRowHeaderView(lnNum);
}
else{
scrollPane.setRowHeaderView(null);
}
}
public String getText(){
int caretPosition = textPane.getDocument().getLength();
javax.swing.text.Element root = textPane.getDocument().getDefaultRootElement();
String text = "1" + System.getProperty("line.separator");
for(int i = 2; i <= root.getElementIndex( caretPosition ) + 1; i++){
text += i + System.getProperty("line.separator");
}
return text;
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(OpenDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(OpenDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(OpenDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(OpenDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new OpenDemo().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenuItem cut;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem open;
private javax.swing.JMenuItem selectAll;
private javax.swing.JTabbedPane tp;
private javax.swing.JCheckBoxMenuItem viewLineNumbers;
// End of variables declaration
@Override
public void stateChanged(ChangeEvent ce) {
JTabbedPane sourceTabbedPane = (JTabbedPane) ce.getSource();
int index = sourceTabbedPane.getSelectedIndex();
try
{
textPane =textPanes.get(index);
}
catch(IndexOutOfBoundsException e1){
}
}
public int getLineAtCaret(JTextComponent component)
{
int caretPosition = component.getCaretPosition();
Element root = component.getDocument().getDefaultRootElement();
return root.getElementIndex( caretPosition ) + 1;
}
public int getColumnAtCaret(JTextComponent component)
{
FontMetrics fm = component.getFontMetrics( component.getFont() );
int characterWidth = fm.stringWidth( "0" );
int column = 0;
try
{
Rectangle r = component.modelToView( component.getCaretPosition() );
int width = r.x - component.getInsets().left;
column = width / characterWidth;
}
catch(BadLocationException ble) {}
return column + 1;
}
}
答案 0 :(得分：0)
我想，我设法回答了你所有的问题，但我需要创建另一个我称之为“OInternalFrame”的课程，所以我会给你们这两个课程的代码。告诉我，如果这是你想要实现的目标：
OpenDemo：
import java.awt.FileDialog;
import java.awt.FontMetrics;
import java.awt.Rectangle;
import java.beans.PropertyVetoException;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.AbstractButton;
import javax.swing.JTabbedPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.InternalFrameAdapter;
import javax.swing.event.InternalFrameEvent;
import javax.swing.text.BadLocationException;
import javax.swing.text.Element;
import javax.swing.text.JTextComponent;
public class OpenDemo extends javax.swing.JFrame implements ChangeListener{
private ArrayList<OInternalFrame> frames = new ArrayList<OInternalFrame>();
private OInternalFrame currentFrame;
int i=0;
public OpenDemo() {
initComponents();
viewLineNumbers.setSelected(false);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tp = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
open = new javax.swing.JMenuItem();
cut = new javax.swing.JMenuItem();
selectAll = new javax.swing.JMenuItem();
viewLineNumbers = new javax.swing.JCheckBoxMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jMenu1.setText("File");
open.setText("Open");
open.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
openActionPerformed(evt);
}
});
jMenu1.add(open);
cut.setText("Cut");
cut.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
cutActionPerformed(evt);
}
});
jMenu1.add(cut);
selectAll.setText("SelectAll");
selectAll.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
selectAllActionPerformed(evt);
}
});
jMenu1.add(selectAll);
viewLineNumbers.setSelected(true);
viewLineNumbers.setText("ViewLineNumbers");
viewLineNumbers.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
viewLineNumbersActionPerformed(evt);
}
});
jMenu1.add(viewLineNumbers);
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void openActionPerformed(java.awt.event.ActionEvent evt) {
FileDialog fd = new FileDialog(OpenDemo.this, "Select File", FileDialog.LOAD);
fd.show();
String title;
String sts;
if (fd.getFile() != null) {
sts = fd.getDirectory() + fd.getFile();
title=fd.getFile();
System.out.println(sts);
title=fd.getFile();
BufferedReader br = null;
StringBuffer str = new StringBuffer("");
try {
br = new BufferedReader(new FileReader(sts));
String line;
try {
while ((line = br.readLine()) != null) {
str.append(line + "\n");
}
} catch (IOException ex) {
Logger.getLogger(OpenDemo.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (FileNotFoundException ex) {
Logger.getLogger(OpenDemo.class.getName()).log(Level.SEVERE, null, ex);
}
String t = str.toString();
OInternalFrame internalFrame = new OInternalFrame("",true,true);
i++;
internalFrame.setName("Doc "+i);
internalFrame.setTitle(title);
try {
internalFrame.setSelected(true);
} catch (PropertyVetoException ex) {
Logger.getLogger(OpenDemo.class.getName()).log(Level.SEVERE, null, ex);
}
internalFrame.addInternalFrameListener(new InternalFrameAdapter() {
@Override
public void internalFrameClosing(InternalFrameEvent e) {
i--;
frames.remove(currentFrame);
tp.remove(currentFrame);
for(OInternalFrame frame : frames)
{
int index=frames.indexOf(frame);
tp.setTitleAt(index, "Doc "+(index+1));
}
}
});
tp.add(internalFrame);
tp.setSelectedIndex(i-1);
tp.addChangeListener(this);
frames.add(internalFrame);
currentFrame=internalFrame;
currentFrame.setText(t);
currentFrame.setVisible(true);
currentFrame.setLineViewer(viewLineNumbers.isSelected());
}
}
private void cutActionPerformed(java.awt.event.ActionEvent evt) {
currentFrame.cut();
}
private void selectAllActionPerformed(java.awt.event.ActionEvent evt) {
currentFrame.selectAll();
}
private void viewLineNumbersActionPerformed(java.awt.event.ActionEvent evt) {
AbstractButton button = (AbstractButton) evt.getSource();
currentFrame.setLineViewer(viewLineNumbers.isSelected());
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(OpenDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(OpenDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(OpenDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(OpenDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new OpenDemo().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenuItem cut;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem open;
private javax.swing.JMenuItem selectAll;
private javax.swing.JTabbedPane tp;
private javax.swing.JCheckBoxMenuItem viewLineNumbers;
// End of variables declaration
@Override
public void stateChanged(ChangeEvent ce) {
JTabbedPane sourceTabbedPane = (JTabbedPane) ce.getSource();
int index = sourceTabbedPane.getSelectedIndex();
try
{
currentFrame =frames.get(index);
currentFrame.setLineViewer(viewLineNumbers.isSelected());
}
catch(IndexOutOfBoundsException e1){
}
}
public int getLineAtCaret(JTextComponent component)
{
int caretPosition = component.getCaretPosition();
Element root = component.getDocument().getDefaultRootElement();
return root.getElementIndex( caretPosition ) + 1;
}
public int getColumnAtCaret(JTextComponent component)
{
FontMetrics fm = component.getFontMetrics( component.getFont() );
int characterWidth = fm.stringWidth( "0" );
int column = 0;
try
{
Rectangle r = component.modelToView( component.getCaretPosition() );
int width = r.x - component.getInsets().left;
column = width / characterWidth;
}
catch(BadLocationException ble) {}
return column + 1;
}
}
OInternalFrame：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Rectangle;
import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Element;
import javax.swing.text.JTextComponent;
public class OInternalFrame extends JInternalFrame
{
private JTextArea textPane;
private JScrollPane scrollPane;
private JTextPane linePane;
private JTextField status;
private DocumentListener listen;
public OInternalFrame(String title,boolean resizable,boolean closable)
{
super(title,resizable,closable);
initComponents();
initListeners();
}
private void initComponents()
{
textPane = new JTextArea();
linePane = new JTextPane();
status = new JTextField();
scrollPane = new JScrollPane();
textPane.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
status.setBackground(Color.LIGHT_GRAY);
linePane.setEditable(false);
linePane.setSize(50,50);
linePane.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
status.setEditable(false);
// add(textPane);
add(scrollPane);
add(status,BorderLayout.SOUTH);
scrollPane.getViewport().add(textPane);
scrollPane.setRowHeaderView(linePane);
setVisible(true);
linePane.setVisible(false);
updateStatus(1,1);
scrollPane.setVisible(true);
}
private void initListeners()
{
textPane.addCaretListener(new CaretListener() {
@Override
public void caretUpdate(CaretEvent e) {
int linenum = 1;
int columnnum = 1;
try {
int caretpos = textPane.getCaretPosition();
linenum=getLineAtCaret()-1;
columnnum=getColumnAtCaret();
linenum += 1;
}
catch(Exception ex) { }
updateStatus(linenum, columnnum);
}
});
listen = new DocumentListener(){
@Override
public void changedUpdate(DocumentEvent de) {
linePane.setText(getText());
}
@Override
public void insertUpdate(DocumentEvent de) {
linePane.setText(getText());
}
@Override
public void removeUpdate(DocumentEvent de) {
linePane.setText(getText());
}
};
}
public int getLineAtCaret()
{
int line = 0;
int caretPosition = textPane.getCaretPosition();
try {
line = textPane.getLineOfOffset(caretPosition);
} catch (BadLocationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return line+1;
}
public int getColumnAtCaret()
{
FontMetrics fm = textPane.getFontMetrics( textPane.getFont() );
int characterWidth = fm.stringWidth( "0" );
int column = 0;
try
{
Rectangle r = textPane.modelToView( textPane.getCaretPosition() );
int width = r.x - textPane.getInsets().left;
column = width / characterWidth;
}
catch(BadLocationException ble) {}
return column + 1;
}
private void updateStatus(int linenumber, int columnnumber)
{
status.setText("Line: " + linenumber + " Column: " + columnnumber);
}
public void setText(String t)
{
System.out.println(t);
textPane.setText(t);
textPane.setCaretPosition(0);
textPane.setVisible(true);
textPane.repaint();
}
public void setLineViewer(boolean enabled)
{
if(enabled)
{
linePane.setText(getText());
linePane.setCaretPosition(0);
linePane.revalidate();
linePane.repaint();
textPane.getDocument().addDocumentListener(listen);
}
else
{
linePane.setText("");
textPane.getDocument().removeDocumentListener(listen);
}
linePane.setVisible(enabled);
}
public void cut()
{
textPane.cut();
}
public void selectAll()
{
textPane.selectAll();
}
public String getText(){
int caretPosition = textPane.getLineCount();
String text = "1" + System.getProperty("line.separator");
for(int i = 2; i <= caretPosition-1; i++){
text += i + System.getProperty("line.separator");
}
return text;
}
}
答案 1 :(得分：0)
使用DefaultEditorKit提供的操作。例如：
JMenuItem cut = new DefaultEditorKit.CutAction();
对于＆＃34; SelectAll＆＃34;您需要采取行动，扩展TextAction：
class SelectAll extends TextAction
{
public SelectAll()
{
super("Select All");
}
public void actionPerformed(ActionEvent e)
{
JTextComponent component = getFocusedComponent();
component.selectAll();
}
}
这些操作适用于最后一个有焦点的文本组件。