java - 使用 JXDatePicker 时 JLabel 背景扭曲

Question

一旦我点击JXDatePicker(在我的程序代码中名为j)，添加它的JLabel(在我的程序代码中名为l1)背景就会变得扭曲了。我还尝试在单击鼠标时重新绘制 l1，但是它不起作用。任何帮助将不胜感激。

程序代码:

import java.util.HashMap; 
import java.awt.*;
import java.awt.event.*;
import java.awt.font.TextAttribute;
import javax.swing.border.*;
import org.jdesktop.swingx.JXDatePicker;
import org.jdesktop.swingx.prompt.PromptSupport;
import javax.swing.*;


public class Registration
{
    JFrame stu_reg;
    JLabel back, logo, header, l1, l2, l3;
    JButton sub, cls;
    JTextField t1, t2;
    JFormattedTextField ft1;

    Connection c;

    Registration()
    {   
        try 
        {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } 
        catch (Exception ex) 
        {
            ex.printStackTrace();
        }

        stu_reg = new JFrame("Student Registration Form");
        stu_reg.setSize(1366,740);
        stu_reg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        stu_reg.setLayout(null);
        stu_reg.setVisible(true);
        stu_reg.setResizable(false);


        header = new JLabel("XYZ");
        header.setForeground(Color.RED);
        HashMap<TextAttribute, Object>  attribute = new HashMap<TextAttribute, Object>();
        attribute.put(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
        header.setFont(new Font("A.C.M.E. Secret Agent",Font.BOLD,30).deriveFont(attribute));
        header.setBounds(350, 0, 800, 75);
        stu_reg.add(header);

        ImageIcon image1 = new ImageIcon(Registration.class.getProtectionDomain().getCodeSource().getLocation().getPath() + "xyz.jpg");
        back = new JLabel(new ImageIcon(image1.getImage().getScaledInstance(1366, 730, Image.SCALE_SMOOTH)));
        back.setBounds(0, 0, 1366, 730);
        stu_reg.add(back);

        ImageIcon image = new ImageIcon(Registration.class.getProtectionDomain().getCodeSource().getLocation().getPath() + "R2.gif");
        logo = new JLabel(new ImageIcon(image.getImage().getScaledInstance(200, 200, Image.SCALE_SMOOTH)));
        logo.setBounds(1100, 0, 200, 200);
        back.add(logo);

        l1 = new JLabel();
        l1.setBackground(new Color(100, 100, 100, 70));
        l1.setOpaque(true);
        l1.setBounds(150, 80, 420, 590);
        LineBorder line = new LineBorder(Color.blue, 2, true);
        Font f = new Font("Scramble",Font.PLAIN,25).deriveFont(attribute);
        TitledBorder title = new TitledBorder(line, "Register", TitledBorder.LEFT, TitledBorder.TOP, f, new Color(225,80,0));
        l1.setBorder(title);
        back.add(l1);

        l2 = new JLabel("FULL NAME");
        l2.setFont(new Font("",Font.BOLD,14));
        l2.setBounds(27, 50, 100, 35);
        l1.add(l2);

        t1 = new JTextField(100);
        t1.setBounds(25, 80, 175, 35);
        PromptSupport.setPrompt("First Name", t1);
        PromptSupport.setFocusBehavior(PromptSupport.FocusBehavior.SHOW_PROMPT, t1);
        l1.add(t1);

        t2 = new JTextField(100);
        t2.setBounds(220, 80, 175, 35);
        PromptSupport.setPrompt("Last Name", t2);
        PromptSupport.setFocusBehavior(PromptSupport.FocusBehavior.SHOW_PROMPT, t2);
        l1.add(t2);

        l3 = new JLabel("DATE OF BIRTH");
        l3.setFont(new Font("",Font.BOLD,14));
        l3.setBounds(27, 130, 175, 35);
        l1.add(l3);

        JXDatePicker j=new JXDatePicker();
        j.setBounds(25, 160, 175, 33);
        j.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
            l1.repaint();
            }
        });
        l1.add(j);


        ToolTipManager.sharedInstance().setEnabled(false);


    }

    public static void main(String args[])
    {   
        SwingUtilities.invokeLater( ()->new Registration() );
    }
}

无失真

失真后

Answer 1

l1.setBackground(new Color(100, 100, 100, 70));

Swing 不正确支持透明背景。如果组件是不透明的，则 Swing 期望背景是不透明的，而不是透明的。

如果你想要透明背景，那么你需要进行自定义绘画。

查看Backgrounds With Transparency了解更多信息和解决方案。