JAVA 中的 GridBagLayout

Question

我想使用 GridBagLayout 显示图像、JLabel 和 JTextField。

图片应该是这样的

这是我试过的，但是 JTextField 显示在图像下方，除此之外

   JPanel panel = new JPanel(new GridBagLayout());
   gbc = new GridBagConstraints();

   for (int i = 0; i < ELEMENTS; i++) {
        Image image = ImageIO.read(file[i]);
        Image imageScaled = image.getScaledInstance(80, 95, Image.SCALE_SMOOTH);
        ImageIcon imageIcon = new ImageIcon(imageScaled);
        foodLabel[i] = new JLabel(imageIcon);
        qtyField[i] = new JTextField(3);
    }

    gbc.gridx = 0;
    for (int i = 0; i < ELEMENTS; i++) {
        if (i % 3 == 0) {
            gbc.gridy += 2;
            gbc.gridx = 0;
        }
        panel.add(foodLabel[i], gbc);
        gbc.gridy++;
        panel.add(qtyField[i], gbc);
        gbc.gridx++;
        gbc.gridy--;
        tabbedPane.addTab(text, panel);
    }

Answer 1

问题是你加减gridy的值错了。要将代码调整为 qtyField 在 foodLabel 的右侧，只需删除那些 gbc.gridy 并在 panel.add(foodLabel[i], gbc).

之后添加一个 gbc.gridx ++

现在，它不会像你的图像一样（至少我认为它不会，除非你正确设置 foodLabel，即使你这样做，正确对齐也会有一些工作)，为此您可以创建一个 JLabel (foodImage) 的新数组，与 foodLabel 的大小相同，您可以在其中仅显示图像。那么你的代码几乎是正确的，只需要移动一些行并添加 foodImage。我写了，这里是：

JPanel panel = new JPanel(new GridBagLayout());
gbc = new GridBagConstraints();
// Just to give a space between the components
gbc.insets = new Insets(5, 5, 5, 5);

for (int i = 0; i < ELEMENTS; i++) {
    Image image = ImageIO.read(file[i]);
    Image imageScaled = image.getScaledInstance(80, 95, Image.SCALE_SMOOTH);
    ImageIcon imageIcon = new ImageIcon(imageScaled);
    foodImage[i] = new JLabel(imageIcon);
    foodLabel[i] = new JLabel("Label");
    qtyField[i] = new JTextField(3);
}

gbc.gridx = 0;
for (int i = 0; i < ELEMENTS; i++) {
    if (i % 3 == 0) {
        gbc.gridy += 2;
        gbc.gridx = 0;
    }

    // Add the image
    panel.add(foodImage[i], gbc);
    // Below the image
    gbc.gridy++;
    // Add the label
    panel.add(foodLabel[i], gbc);
    // Go back up
    gbc.gridy--;
    // Next column
    gbc.gridx++;
    // Add the textfield
    panel.add(qtyField[i], gbc);
    // Next column
    gbc.gridx++;
    tabbedPane.addTab(text, panel);
}

I ran this code, and should be like this

Answer 2

你应该像这样更改 for 循环

 // initialize gridy with -2 because when i == 0 you increase it by 2 in the for loop
 gbc.gridy = -2;
 gbc.gridx = 0;

 for (int i = 0; i < ELEMENTS; i++) {
     if (i % 3 == 0) {
         gbc.gridy += 2;
         gbc.gridx = 0;
     }
     panel.add(foodLabel[i], gbc);
     gbc.gridx++;
     panel.add(qtyField[i], gbc);
     gbc.gridx++;

     // do you really whant to do this within the loop? I guess it should be outside...
     // tabbedPane.addTab(text, panel);
 }
 tabbedPane.addTab(text, panel);

...还有最后一个问题：为什么要将 gridy 增加 2？加1还不够吗？

JAVA 中的 GridBagLayout

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