java swing gridbaglayout元素在网格Y中重叠

路易斯·贝穆德斯

我正在学习如何使用 Java Swing 中的 GridBagLayout ...

在此示例中，我想在每行中放置 4 个元素，如您在我的代码中所见：

        this.setLayout(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        //constraints.weighty = 1;
        constraints.anchor = GridBagConstraints.NORTHWEST;
        constraints.fill = constraints.HORIZONTAL;
        this.add(label1, constraints);
        constraints.weighty = 0.0; 
        
        constraints.gridx = 1;
        constraints.gridy = 1;
        constraints.gridwidth = 0;
        constraints.gridheight = 1;
        constraints.weighty = 1;
        constraints.anchor = GridBagConstraints.CENTER;
        constraints.fill = constraints.BOTH;
        this.add(label, constraints);
        constraints.weighty = 0.0; 
        
        JLabel precio = new JLabel();
        precio.setText("Precio    12345.5");
        constraints.gridx = 0;
        constraints.gridy = 2;
        constraints.gridwidth = 2;
        constraints.gridheight = 2;
        constraints.weighty = 1;
        constraints.fill = constraints.HORIZONTAL;
        constraints.anchor = GridBagConstraints.NORTH;
        this.add(precio, constraints);
        constraints.weighty = 0.0; 
        
        JLabel cantidad = new JLabel();
        cantidad.setText("Cantidad    ");
        constraints.gridx = 0;
        constraints.gridy = 3;
        constraints.gridwidth = 2;
        constraints.gridheight = 2;
        constraints.weightx = 1;
        constraints.fill = constraints.HORIZONTAL;
        constraints.anchor = GridBagConstraints.NORTH;
        this.add(cantidad, constraints);
        constraints.weighty = 0.0; 
        
        JTextField textfield = new JTextField();
        textfield.setPreferredSize(new Dimension(100 , 30));
        constraints.gridx = 2;
        constraints.gridy = 3;
        constraints.gridwidth = 2;
        constraints.gridheight = 2;
        constraints.weighty = 1;
        constraints.fill = constraints.HORIZONTAL;
        this.add(textfield, constraints);
        constraints.weighty = 0.0; 
        
        JButton boton = new JButton();
        boton.setText("Agregar");
        constraints.gridx = 0;
        constraints.gridy = 4;
        constraints.gridwidth = 2;
        constraints.gridheight = 2;
        constraints.weightx = 1;
        constraints.fill = constraints.HORIZONTAL;
        constraints.anchor = GridBagConstraints.NORTH;
        this.add(precio, constraints);
        constraints.weighty = 0.0;

正如您在代码中看到的那样。

在第 0 行，我想放一个 JLabel

在第 1 行，我想放一个带有图标的 JLabel

在第 2 行，我想放一个 JTextField

在第 3 行，我想在右侧放置一个 JTextfield 和 JTextField

最后在第 4 行，我想在列的中心放置一个 JButton

但是当我运行 JFrame 时我得到了这个：

从第二行开始，我让组件重叠，我不知道为什么。

也许我在 GridBagLayout 行为中遗漏了一些东西，因为我仍在学习如何使用它。

欢迎任何帮助！谢谢！

吉尔伯特·勒布朗

Oracle 有一个有用的教程，使用 Swing 创建 GUI。跳过使用 NetBeans IDE 学习摇摆部分。

您的代码有几个语法错误。一旦我修复了这些，我就运行了你的代码。

我不确定你到底想要什么。根据您的描述，我修改了您的代码以生成以下 GUI。

使用 aGridBagLayout时，您设置了某些参数，并且您为每个 Swing 组件修改了其他参数。有关详细信息，请参阅 Oracle 教程如何使用 GridBagLayout。

下一次，发布可以复制到 IDE 并进行测试的可运行代码。

这是我使用的完整的可运行代码。

import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class GridBagLayoutExample implements Runnable {

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

    @Override
    public void run() {
        JFrame frame = new JFrame("Cell-33");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(createMainPanel(), BorderLayout.CENTER);

        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public JPanel createMainPanel() {
        JPanel panel = new JPanel(new GridBagLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

        GridBagConstraints constraints = new GridBagConstraints();

        constraints.anchor = GridBagConstraints.LINE_START;
        constraints.fill = GridBagConstraints.HORIZONTAL;
        constraints.insets = new Insets(0, 10, 5, 10);
        constraints.gridwidth = 1;
        constraints.gridheight = 1;

        constraints.gridx = 0;
        constraints.gridy = 0;
        JLabel label1 = new JLabel("Label1");
        panel.add(label1, constraints);

        constraints.gridx++;
        JLabel label = new JLabel("Label");
        panel.add(label, constraints);

        constraints.gridx++;
        JLabel precio = new JLabel();
        precio.setText("Precio    12345.5");
        panel.add(precio, constraints);

        constraints.gridx++;
        JLabel cantidad = new JLabel("Cantidad");
        panel.add(cantidad, constraints);

        constraints.gridx++;
        JTextField textfield = new JTextField(20);
        panel.add(textfield, constraints);

        constraints.gridx++;
        JButton boton = new JButton();
        boton.setText("Agregar");
        panel.add(boton, constraints);

        return panel;
    }

}

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