java如何将JLabel添加到现有JTextField

1 周，3 日 Questions & Answers 578

我想将Capslock标签添加到状态JtextField。状态已获得行和列值。我想添加带有行和列的capslock。我已经尝试添加updateStatus()方法，但它并没有像预期的那样工作

示例代码：

public class CapsLock extends javax.swing.JFrame {
    JTextField status;
    int i=0;
    JTextArea textArea;
    JLabel capsLock;
    public CapsLock() {
        initComponents();
        status=new JTextField();
        capsLock=new JLabel();
        updateStatus(1,1);
    }
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        tabbedPane = new javax.swing.JTabbedPane();
        jMenuBar1 = new javax.swing.JMenuBar();
        file = new javax.swing.JMenu();
        newFile = new javax.swing.JMenuItem();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        file.setText("File");

        newFile.setText("NewFile");
        newFile.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                newFileActionPerformed(evt);
            }
        });
        file.add(newFile);

        jMenuBar1.add(file);

        setJMenuBar(jMenuBar1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(tabbedPane, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 279, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(tabbedPane, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        
    private void updateStatus(int linenumber, int columnnumber) {
        status.setText("ln: " + linenumber + " Col: " + columnnumber);
     }
    private void newFileActionPerformed(java.awt.event.ActionEvent evt) {                                        
        final JInternalFrame internalFrame = new JInternalFrame("");
        i++;
        internalFrame.setName("Doc "+i);
        internalFrame.setClosable(true);
        internalFrame.setAutoscrolls(true);
        textArea=new JTextArea();
        textArea.addKeyListener(new KeyListener() {
            @Override
            public void keyTyped(KeyEvent ke) {
            }

            @Override
            public void keyPressed(KeyEvent ke) {
              if(Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK)){
                   capsLock.setText("ON");
              }
              else{
                    capsLock.setText("OFF");
                    status.setText(capsLock.getText());
              }  
            }
            @Override
            public void keyReleased(KeyEvent ke) {
            }
        });
        textArea.addCaretListener(new CaretListener() {
        @Override
        public void caretUpdate(CaretEvent e) {
              JTextArea editArea = (JTextArea)e.getSource();
              int linenum = 1;
              int columnnum = 1;
               try {
                    int caretpos = editArea.getCaretPosition();
                    linenum = editArea.getLineOfOffset(caretpos);
                    columnnum = caretpos - editArea.getLineStartOffset(linenum);
                    linenum += 1;
                }
                catch(Exception ex) { }
                updateStatus(linenum, columnnum);
            }
        });

        status.setBackground(Color.LIGHT_GRAY);
        status.setEditable(false);
        internalFrame.add(textArea);
        internalFrame.add(status,BorderLayout.SOUTH);
        tabbedPane.add(internalFrame);
    }                                       

    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(CapsLock.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(CapsLock.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(CapsLock.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(CapsLock.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new CapsLock().setVisible(true);
            }
        });
    }

    private javax.swing.JMenu file;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem newFile;
    private javax.swing.JTabbedPane tabbedPane;                
}

我编写StatusPanel类，如下所示：

public class StatusPanel extends JPanel{

InternalFrame currentFrame;
private JLabel statusLabel;
JLabel capsLabel;
public StatusPanel(){
    statusLabel=new JLabel();
    capsLabel=new JLabel();
    add(statusLabel);
    add(capsLabel);
    updateStatus(1,1);
}
public void setRowColumn(){
    currentFrame.textPane.addCaretListener(new CaretListener() {
        private KeyEvent KeyEvent;
        @Override
        public void caretUpdate(CaretEvent e) {

            int linenum = 1;
            int columnnum = 1;
            try {
                int caretpos = currentFrame.textPane.getCaretPosition();
                linenum=currentFrame.getLineAtCaret()-1;
                columnnum=currentFrame.getColumnAtCaret();
                linenum += 1;
            }
            catch(Exception ex) { }
            updateStatus(linenum, columnnum);
        }
    });      
}
private void updateStatus(int linenumber, int columnnumber) 
{
    statusLabel.setText("Line: " + linenumber +"  "+ " Column: " + columnnumber);
}
public void setCapslock(){
    currentFrame.textPane.addKeyListener(new KeyListener() {
        @Override
        public void keyTyped(KeyEvent ke) {
            //throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }

        @Override
        public void keyPressed(KeyEvent ke) {
            if(Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK)){
               capsLabel.setText("    CAPS ON");
    }
            else{
                capsLabel.setText("    CAPS OFF");
            }
        }

        @Override
        public void keyReleased(KeyEvent ke) {
            //throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }
    }); 
}
}

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共 (1) 个答案

# 1 楼答案

在“如果”代码中，只有一条语句。在“else”语句中有两个语句。你不认为代码应该是一样的，除了文本吗
此外，您不应该使用文本字段来显示文本。相反，您应该使用带有多个标签的面板。一个用于行/列位置的标签。Caps Lock状态的另一个标签。然后只更新更改的标签的文本

.Caps lock enable/disable not update the all the opened Documents.

然后你有几个解决方案：

您的状态栏应该是框架的通用状态栏，而不是文档的通用状态栏。因此，所有文档都将共享这些标签。这意味着，每当一个文档获得焦点时，您都需要更新插入符号位置，但从上一个文档开始，大写锁定仍然是正确的
或者，可以将Caps Lock字段创建为不可编辑的JTextField。然后，您可以将文本字段的文档与所有文本字段共享。这意味着当您更新文本字段时，它将反映在所有文档上

因此，在为应用程序创建新文档时，需要传入共享文本字段文档。然后，要创建要使用的文本字段：

JTextField textField = new JTextField( sharedDocument );

编辑：

为框架创建构件时，代码如下：

StatusPanel status = new StatusPanel();
frame.add(status, ...);

然后在这个自定义类中添加组件以显示想要显示的数据。您还需要添加setRowColumn(...)和setCapsLock(...)等方法来显示这些组件的文本

然后，您需要创建另一个扩展JInternalFrame的自定义类MyInternalFrame。然后，当您创建此类时，您将使用：

MyInternalFrame internal = new MyInternalFrame(status);

现在，您的自定义内部框架可以访问状态栏，您可以从创建的任何文档更新状态栏

另一个编辑：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class Status extends JPanel
{
    public Status()
    {
        setLayout( new BorderLayout() );

        StatusPanel status = new StatusPanel();
        add(status, BorderLayout.SOUTH);

        DocumentPanel document = new DocumentPanel( status );
        add(document, BorderLayout.CENTER);
    }

    class StatusPanel extends JPanel
    {
        JLabel caretStatus = new JLabel("Caret Offset: 0");

        public StatusPanel()
        {
            add( caretStatus );
        }

        public void updateCaretStatus(String status)
        {
            caretStatus.setText( status );
        }
    }

    class DocumentPanel extends JPanel
    {
        private StatusPanel status;
        private JTextArea textArea;

        public DocumentPanel(StatusPanel statusPanel)
        {
            status = statusPanel;

            textArea = new JTextArea(5, 30);
            add( new JScrollPane( textArea ) );

            textArea.addCaretListener( new CaretListener()
            {
                @Override
                public void caretUpdate(CaretEvent e)
                {
                    status.updateCaretStatus( "Caret Offset: " + textArea.getCaretPosition() );
                }
            });
        }
    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("Status");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new Status() );
        frame.setLocationByPlatform( true );
        frame.pack();
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
    }
}

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java如何将JLabel添加到现有JTextField

共 (1) 个答案

# 1 楼答案