java - 如何修复 GridBagLayout 按钮大小

Question

import javax.swing.JFrame;

public class Main {
    private JFrame frame;

    /**
     * @param args
     */
    public Main() {
        frame = new JFrame();
        frame.setTitle("450");
        frame.setSize(1000, 600);
        MemberPanel memberPanel = new MemberPanel();
        frame.add(memberPanel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        new Main();
    }

}
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.TextField;
import javax.swing.JButton;
import javax.swing.JPanel;

public class MemberPanel extends JPanel{
    private GridBagConstraints c;

    public MemberPanel() {
        setLayout(new GridBagLayout());
        c = new GridBagConstraints();
        memberPage();
        //memberPage2();

    }
    public void memberPage() {
        JButton addMovie = new JButton("Add Movie");
        JButton random = new JButton("Random");
        JButton storedData = new JButton("Stored Data");
        JButton settings = new JButton("Settings");
        JButton quit = new JButton("Quit");
        JButton search = new JButton("Search");
        TextField searchBar = new TextField(40);
        removeAll();
        repaint();
        revalidate();
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 0;
        c.gridy = 0;
        add(addMovie, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 1;
        c.gridy = 0;
        add(random, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 2;
        c.gridy = 0;
        add(storedData, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 3;
        c.gridy = 0;
        add(settings, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 4;
        c.gridy = 0;
        add(quit, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(20, 20, 20, 20); // side padding
        c.gridx = 2;
        c.gridy = 2;
        add(searchBar, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(20, 20, 20, 20); // side padding
        c.gridx = 3;
        c.gridy = 2;
        add(search, c);
    }
    public void memberPage2(){
        JButton addMovie = new JButton("Add Movie");
        JButton random = new JButton("Random");
        JButton storedData = new JButton("Stored Data");
        JButton settings = new JButton("Settings");
        JButton quit = new JButton("Quit");
        JButton search = new JButton("Search");
        TextField searchBar = new TextField(40);
        removeAll();
        repaint();
        revalidate();
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 0;
        c.gridy = 0;
        add(addMovie, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 1;
        c.gridy = 0;
        add(random, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 2;
        c.gridy = 0;
        add(storedData, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 3;
        c.gridy = 0;
        add(settings, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.ipady = 20;
        c.ipadx = 40;
        c.insets = new Insets(0, 20, 20, 0); // side padding
        c.gridx = 4;
        c.gridy = 0;
        add(quit, c);
    }
}

在类MemberPanel的构造函数中，有两个函数memberPage()和memberPage2()。 memberPage() 是我想要实现的函数，但按钮的大小都是错误的。我希望除 searchBar 和 search 之外的所有按钮都具有相同的大小。要明白我的意思，请取消注释 memberPage2() 并注释掉 memberPage()。如何在添加 searchBar 和 search 按钮并使用 gridBagLayout< 时使 memberPage2() 中的所有按钮保持相同大小？

Answer 1

多读了几遍你的问题，我终于明白你真正的问题是什么了。一开始我不太明白；下面的原始答案(线下)实际上并不能解决您的问题。这是您的问题:

GridBagLayout 将所有内容放入行和列的网格中(gridx、gridy)。您的“存储数据”按钮与文本字段的宽度相同，因为它们是同一列的一部分。有几种方法可以解决这个问题，具体做什么取决于您希望它是什么样子。

最简单的(我认为)答案是让文本字段占据多列。 GridBagConstraint 有一个 gridwidth 字段用于此目的。

c.gridwidth = 3;
panel.add(txtField, c);
c.gridwidth = 1; // don't forget to put it back after

如果您这样做，请记住“搜索”按钮也需要位于不同的列中，因为文本字段右侧的下一列(以及之后的下一列，网格宽度为 3)是全部被文本字段占据。因此，要么将文本字段设置为 gridx=0，要么将搜索按钮的 gridx 再移动 2。

<小时/>

通常，您可以通过设置按钮的 setPreferredSize(Dimension) 来控制按钮的大小

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

c.gridx = x1;
c.gridy = y1;
JButton btn1 = new JButton("Smaller");
btn1.setPreferredSize(new Dimension(30, 20));
panel.add(btn1, c);

c.gridx = x2;
c.gridy = y2;
JButton btn2 = new JButton("Larger");
btn2.setPreferredSize(new Dimension(50, 40));
panel.add(btn1, c);

这就是你所追求的吗？

如果您希望新尺寸相对于旧尺寸，可以使用Dimension getPreferredSize()获取当前尺寸，然后您可以使新尺寸使用width 和 height 与旧的相加或相乘。

Dimension d = btn1.getPreferredSize();
btn1.setPreferredSize(d.width + 30, d.height);

setPreferredSize