java - Java GridBagLayout和GridBagConstraints

我发现有很多关于如何使用GridBagLayout的文章，但是它们总是与我所需要的相反。

例如，在this post中，按钮的第一行跨越宽度，而在其下方仅一个按钮。我的兴趣主要是前两行。



但是考虑相反的情况，我希望第1行中的正好1个按钮跨过第2行中的正好4个按钮的宽度，并且此后可以是任意多个。

[=========按钮========] [=========按钮========]

[按钮] [按钮] [按钮] [按钮]
[按钮] [按钮] [按钮] [按钮]

最佳答案

这是您如何获得所需布局的方法。

public GridBagConstraintsFrame() {
    Container c = getContentPane();
    JPanel p = new JPanel(new GridBagLayout());
    c.setLayout(new BorderLayout());

    {
        JButton button1 = new JButton("Button 1");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridheight = 1;
        gbc.gridwidth = 4;
        gbc.weightx = 0;
        gbc.weighty = 0;
        gbc.fill = gbc.HORIZONTAL;
        p.add(button1, gbc);
    }

    {
        JButton button2 = new JButton("Button 2");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 4;
        gbc.gridy = 0;
        gbc.gridheight = 1;
        gbc.gridwidth = 4;
        gbc.weightx = 0;
        gbc.weighty = 0;
        gbc.fill = gbc.HORIZONTAL;
        p.add(button2, gbc);
    }

    {
        JButton button3 = new JButton("Button 3");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        gbc.weighty = 0;
        p.add(button3, gbc);
    }

    {
        JButton button3 = new JButton("Button 4");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 1;
        gbc.gridy = 1;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        gbc.weighty = 0;
        p.add(button3, gbc);
    }

    {
        JButton button3 = new JButton("Button 5");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 2;
        gbc.gridy = 1;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        gbc.weighty = 0;
        p.add(button3, gbc);
    }

    {
        JButton button3 = new JButton("Button 6");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 3;
        gbc.gridy = 1;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        gbc.weighty = 0;
        p.add(button3, gbc);
    }

    {
        JButton button3 = new JButton("Button 7");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 4;
        gbc.gridy = 1;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        gbc.weighty = 0;
        p.add(button3, gbc);
    }

    {
        JButton button3 = new JButton("Button 8");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 5;
        gbc.gridy = 1;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        gbc.weighty = 0;
        p.add(button3, gbc);
    }

    {
        JButton button3 = new JButton("Button 9");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 6;
        gbc.gridy = 1;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        gbc.weighty = 0;
        p.add(button3, gbc);
    }

    {
        JButton button3 = new JButton("Button 10");
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 7;
        gbc.gridy = 1;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0;
        gbc.weighty = 0;
        p.add(button3, gbc);
    }

    c.add(p, BorderLayout.CENTER);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setTitle("Gridbag constraints.");
    pack();
    setVisible(true);
}

这是它的外观。


如果您需要解释，请在注释中告诉我，我将尝试解释每段代码。

PS。这是一个JFrame。

关于java - Java GridBagLayout和GridBagConstraints，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/28084409/