Question

我试图用java创建一个GUI。我的gui会很简单。你可以在这里看到我想要的东西：http://sketchtoy.com/64839370

为了做到这一点，我决定按照网络上的建议使用BorderLayout。我有两个Jpanel对象，我已将它们放入jFrame，其布局为borderlayout。您可以在下面看到我的简化代码：

private Display display= new Display(); // Display extends JPanel 
public Simulation()
    {
        super();
        // frame settings 
        setTitle("Label of JFrame ");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setBounds(100,100,1094,560);    
        contentPane=this.getContentPane();
        setResizable(false);

        contentPane.setLayout(new BorderLayout());

        try {
            LeftPanelLogo=ImageIO.read(new File("logo.png"));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        // generate left panel (information panel)
        leftPanel=new JPanel(){
            @Override
            public void paintComponent(Graphics g)
            {
                super.paintComponent(g);
                Graphics2D g2d=(Graphics2D)g;
                g2d.drawImage(LeftPanelLogo, 10, 250, null);
            }
        };
        //leftPanel.setLayout(null);

        // add panels to contentPane 


        leftPanel.setBackground(Color.WHITE);
        display.setBackground(Color.BLACK);

        contentPane.add(leftPanel,BorderLayout.WEST);
        contentPane.add(display,BorderLayout.CENTER);
}

在Display类构造函数中，我只有以下代码：

try 
        {
            bgPicture = ImageIO.read(new File("bg.jpg"));
        } 
        catch (IOException e) 
        {
            e.printStackTrace();
        }

当我运行代码时，我看到几乎所有的屏幕都在中心的面板上完成，我看不到左侧面板（换句话说，所有屏幕都是黑色的，因为我设置了背景显示面板为黑色）

那么，我该怎么办呢？

Answer 1

enter image description here

import java.awt.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

public class LogoLayout {

    private JComponent ui = null;

    LogoLayout() {
        initUI();
    }

    public void initUI() {
        if (ui!=null) return;

        ui = new JPanel(new BorderLayout(4,4));
        ui.setBorder(new EmptyBorder(4,4,4,4));

        BufferedImage logo = new BufferedImage(
                276,560,BufferedImage.TYPE_INT_RGB);

        /* All that's needed */
        ui.add(new JLabel(new ImageIcon(logo)), BorderLayout.LINE_START);
        ui.add(new JTextArea("Display", 3, 44));
        /* All that's needed */
    }

    public JComponent getUI() {
        return ui;
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception useDefault) {
                }
                LogoLayout o = new LogoLayout();

                JFrame f = new JFrame("Logo Layout");
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                f.setLocationByPlatform(true);

                f.setContentPane(o.getUI());
                f.pack();
                f.setMinimumSize(f.getSize());

                f.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

使用边框布局Swing创建GUI

1 个答案: