Java 嵌套面板 alpha 值的透明度问题

Question

我是一名三年级的计算机工程师学生，我正在尝试做一个游戏项目。我在 JFrame 中添加了一个背景图像。我试图使我添加到框架中的其他面板透明。我为此使用 alpha 值，例如：new Color(0,0,0,125) .我在我的程序中使用cardLayout，并且每次调用中央面板上的新段或新页面;alphavalue 采用整个面板透明度并将其实现到选定的面板，这会产生问题。示例：我在左侧面板上有 7 个按钮，当我单击犯罪按钮时，犯罪面板进入中心面板，左侧面板再次进入带有按钮的中央面板内部（透明）。

我有16个班级，所以我只添加了主类。对不起，语法不好。希望你能理解我，帮助我。

    import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class TheMafia {
    public static ImageIcon scale(ImageIcon i,int x,int y) {
        Image img = i.getImage();
        Image newimg = img.getScaledInstance(x,y,Image.SCALE_SMOOTH);
        i = new ImageIcon(newimg);
        return i;
    }
    public static void setButton (JButton b,int x,int y) {
        b.setPreferredSize(new Dimension(x,y));
        b.setBackground(Color.gray);
        b.setForeground(Color.white);
        b.setBorder(new LineBorder(Color.black,1));
        b.setFont(new Font("Serif",Font.BOLD,18));
    }
    public static void main(String[] args) {
        ImageIcon home2 = new ImageIcon("home.jpg");
        home2 = scale(home2,1366,768);
        JFrame theMafia = new JFrame();
        theMafia.setTitle("The Mafia Game - Best game in the world!");
        JPanel p1 = new JPanel();
        JPanel p2 = new JPanel();
        theMafia.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        theMafia.setContentPane(new JLabel(home2));
        theMafia.setLayout(new BorderLayout());
        //theMafia.setLayout(new FlowLayout());
        //theMafia.setExtendedState(JFrame.MAXIMIZED_BOTH);
        theMafia.setSize(800,700);
        theMafia.setLocationRelativeTo(null);
        theMafia.setVisible(true);

        p1.setBackground(new Color(0,0,0,35));
        p2.setBackground(new Color(0,0,0,65));
        p1.setPreferredSize(new Dimension(250,150));
        p2.setPreferredSize(new Dimension(250,150));
        //theMafia.add(p1);
        //theMafia.add(p2);



        // kullanıcı oluşturuldu
        User u1 = new User();
        // suçlar oluşturuldu
        Crime c1 = new Crime();
        c1.setName("Yaşlı Kadın");
        c1.setDifficulty(5);
        c1.setStrength(1);
        c1.setMoney(11);
        Crime c2 = new Crime();
        c2.setName("Dükkan Hırsızlığı");
        c2.setDifficulty(10);
        c2.setStrength(3);
        c2.setMoney(67);
        Crime c3 = new Crime();
        c3.setName("Araba Hırsızlığı");
        c3.setDifficulty(20);
        c3.setStrength(6);
        c3.setMoney(133);





        // suçun seçilmesi
        final JPanel crimes = new JPanel(new CardLayout());
        //crimes.setBackground(new Color(0,0,0,65));
        ImageIcon suçişle = new ImageIcon("suçişle.jpg");
        suçişle = scale(suçişle,50,50);
        JButton yap = new JButton("Suçu işle!",suçişle);
        setButton(yap,100,65);
        JPanel crime1 = new JPanel(new GridLayout(2,1));
        crime1.setBackground(new Color(0,0,0,35));
        crime1.setForeground(Color.white);
        JLabel crime1Info = new JLabel("Suç : "+c1.getName()+"n Para : "+c1.getMoney()+"n Yapabilme ihtimali : "+c1.getCapable()+"n Güç : "+c1.getStrength());
        crime1Info.setFont(new Font("Serif",Font.BOLD,15));
        crime1.add(crime1Info);
        crime1.add(yap);
        JPanel crime2 = new JPanel(new GridLayout(2,1));
        crime2.setBackground(new Color(0,0,0,35));
        crime2.setForeground(Color.white);
        JLabel crime2Info = new JLabel("Suç : "+c2.getName()+"n Para : "+c2.getMoney()+"n Yapabilme ihtimali : "+c2.getCapable()+"n Güç : "+c2.getStrength());
        crime2Info.setFont(new Font("Serif",Font.BOLD,15));
        crime2.add(crime2Info);
        crime2.add(yap);
        JPanel crime3 = new JPanel();
        crime3.setBackground(new Color(0,0,0,35));
        crime3.setForeground(Color.white);
        JLabel crime3Info = new JLabel("Suç : "+c3.getName()+"n Para : "+c3.getMoney()+"n Yapabilme ihtimali : "+c3.getCapable()+"n Güç : "+c3.getStrength());
        crime2Info.setFont(new Font("Serif",Font.BOLD,15));
        crime3.add(crime3Info);
        crime3.add(yap);
        crimes.add(crime1,c1.getName());
        crimes.add(crime2,c2.getName());
        crimes.add(crime3,c3.getName());
        String crimesNames [] =   {c1.getName(),c2.getName(),c3.getName()};
        JComboBox crimesbox = new JComboBox(crimesNames);
        crimesbox.setEditable(false);
        crimesbox.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent evt) {
                CardLayout cl = (CardLayout) (crimes.getLayout());
                cl.show(crimes,(String)evt.getItem());
            }
        });
        // menu
        final JPanel menus = new JPanel(new CardLayout());
        //menus.setBackground(new Color(0,0,0,35));
        // crime
        JPanel crime = new JPanel(new BorderLayout());
        crime.setBackground(new Color(0,0,0,35));
        crime.add(crimesbox,BorderLayout.PAGE_START);
        crime.add(crimes,BorderLayout.SOUTH);
        ImageIcon crimeimage = new ImageIcon("thief.png");
        crimeimage = scale(crimeimage,50,50);
        final JButton crimeButton = new JButton("Suçlar",crimeimage);
        setButton(crimeButton,178,76);
        crimeButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                CardLayout cl = (CardLayout) (menus.getLayout());
                if (e.getSource() == crimeButton) {
                    cl.show(menus,"suç");
                }
            }
        });
        // weapon shop
        JPanel weaponShop = new JPanel();
        //weaponShop.setBackground(new Color(0,0,0,125));
        final JButton weaponShopButton = new JButton("Silah Dükkanı");
        setButton(weaponShopButton,178,76);
        // building
        JPanel buildingPanel = new JPanel();
        //buildingPanel.setBackground(new Color(0,0,0,125));
        final JButton buildingButton = new JButton("Binalar");
        setButton(buildingButton,178,76);
        // nightlife
        JPanel nightLife = new JPanel();
        //nightLife.setBackground(new Color(0,0,0,35));
        final JButton nightLifeButton = new JButton("Gece Hayatı");
        setButton(nightLifeButton,178,76);
        // treatment center
        JPanel treatmentCenter = new JPanel();
        //treatmentCenter.setBackground(new Color(0,0,0,35));
        final JButton treatmentCenterButton = new JButton("Tedavi Merkezi");
        setButton(treatmentCenterButton,178,76);
        // casino
        JPanel casinoPanel = new JPanel();
        //casinoPanel.setBackground(new Color(0,0,0,35));
        final JButton casinoButton = new JButton("Gazino");
        setButton(casinoButton,178,76);
        // home page
        JPanel home = new JPanel();
        home.setBackground(new Color(0,0,0,35));
        ImageIcon homeimage = new ImageIcon("home.jpg");
        homeimage = scale(homeimage,1200,800);
        JLabel homelabel= new JLabel();
        home.add(homelabel);
        ImageIcon homeicon = new ImageIcon("home_icon.png");
        homeicon = scale(homeicon,50,50);
        final JButton homeButton = new JButton("Home",homeicon);
        setButton(homeButton,178,76);
        homeButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                CardLayout cl = (CardLayout) (menus.getLayout());
                if (e.getSource() == homeButton) {
                    cl.show(menus,"home");
                }
            }
        });
        menus.add(home,"home");
        menus.add(crime,"suç");
        menus.add(weaponShop,"silahDükkanı");
        menus.add(buildingPanel,"bina");
        menus.add(nightLife,"geceHayatı");
        menus.add(treatmentCenter,"TedaviMerkezi");
        menus.add(casinoPanel,"gazino");
        Color grisi=new Color(13,13,13);
        JPanel menusButton = new JPanel(new GridLayout(10,1));
        //menusButton.setBackground(grisi);
        menusButton.add(homeButton);
        menusButton.add(crimeButton);
        menusButton.add(weaponShopButton);
        menusButton.add(buildingButton);
        menusButton.add(nightLifeButton);
        menusButton.add(treatmentCenterButton);
        menusButton.add(casinoButton);
        menusButton.setOpaque(false);


        theMafia.add(menusButton,BorderLayout.WEST);
        theMafia.add(menus,BorderLayout.CENTER);
    }
}

Answer 1

Swing 无法正确处理透明背景。Swing 期望组件不透明或不透明，透明度会导致问题，因为组件两者都不是。

查看透明度背景以获取更多信息和解决问题的几个解决方案。