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!
最佳答案
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);
}
}
关于Java Graphics2d : text field,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25411278/