Java Graphics2d : text field

Question

我搜索了很多主题，但没有找到任何有具体答案的主题。我需要在 Graphics2D 上输入字段数据(例如 JTextField 或 TextField)。

有人知道如何创建这个组件吗？或者在 Graphics2D 中放置一个文本字段(Component)？

谢谢!

Answer 1

不太确定您要什么，但这里有一些代码，当您双击时，它将向面板添加一个文本字段。然后您可以将文本添加到文本字段。

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

public class InvisibleTextField extends JTextField
    implements ActionListener, FocusListener, MouseListener, DocumentListener
{
    public InvisibleTextField()
    {
        setOpaque( false );
        setColumns( 1 );
        setBorder( null );
        setSize( getPreferredSize() );
        setColumns( 0 );
        addActionListener( this );
        addFocusListener( this );
        addMouseListener( this );
        getDocument().addDocumentListener( this );
    }

//  Implement ActionListener

    public void actionPerformed(ActionEvent e)
    {
        setEditable( false );
    }

//  Implement FocusListener

    public void focusLost(FocusEvent e)
    {
        setEditable( false );
    }

    public void focusGained(FocusEvent e) {}

//  Implement MouseListener

    public void mouseClicked( MouseEvent e )
    {
        if (e.getClickCount() == 2)
            setEditable( true );
    }

    public void mouseEntered( MouseEvent e ) {}

    public void mouseExited( MouseEvent e ) {}

    public void mousePressed( MouseEvent e ) {}

    public void mouseReleased( MouseEvent e ) {}

//  Implement DocumentListener

    public void insertUpdate(DocumentEvent e)
    {
        updateSize();
    }

    public void removeUpdate(DocumentEvent e)
    {
        updateSize();
    }

    public void changedUpdate(DocumentEvent e) {}

    private void updateSize()
    {
        setSize( getPreferredSize() );
    }

    public static void main(String[] args)
    {
        JPanel panel = new JPanel();
        panel.setFocusable( true );
        panel.setLayout( null );
        panel.addMouseListener( new MouseAdapter()
        {
            public void mousePressed(MouseEvent e)
            {
                JPanel panel = (JPanel)e.getSource();

                if (e.getClickCount() == 1)
                {
                    panel.requestFocusInWindow();
                }

                if (e.getClickCount() == 2)
                {
                    InvisibleTextField tf = new InvisibleTextField();
                    tf.setText("Enter Text");
                    tf.setLocation(e.getPoint());
                    panel.add( tf );
                    tf.requestFocusInWindow();
                    tf.selectAll();
                }
            }
        });

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.add(new JLabel("Double Click to Add Text"), BorderLayout.NORTH);
        frame.add(panel);
        frame.setSize(650, 300);
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }
}