Question

我需要根据他们所需的视觉空间百分比来创建框架内容。例如，面板20％，面板2面板180％。这种布局管理有什么布局？

Answer 1

以简化形式GridBagLayout，但成功满足您的要求80％ - 20％

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;

public class BorderPanels extends JFrame {

    private static final long serialVersionUID = 1L;

    public BorderPanels() {
        setLayout(new GridBagLayout());// set LayoutManager
        GridBagConstraints gbc = new GridBagConstraints();
        JPanel panel1 = new JPanel();
        Border eBorder = BorderFactory.createEtchedBorder();

        panel1.setBorder(BorderFactory.createTitledBorder(eBorder, "80pct"));
        gbc.gridx = gbc.gridy = 0;
        gbc.gridwidth = gbc.gridheight = 1;
        gbc.fill = GridBagConstraints.BOTH;
        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.weightx = gbc.weighty = 70;
        add(panel1, gbc); // add component to the ContentPane

        JPanel panel2 = new JPanel();
        panel2.setBorder(BorderFactory.createTitledBorder(eBorder, "20pct"));
        gbc.gridy = 1;
        gbc.weightx = gbc.weighty = 20;
        gbc.insets = new Insets(2, 2, 2, 2);
        add(panel2, gbc); // add component to the ContentPane

        JPanel panel3 = new JPanel();
        panel3.setBorder(BorderFactory.createTitledBorder(eBorder, "20pct"));
        gbc.gridx = 1;
        gbc.gridy = 0;
        gbc.gridwidth = 1;
        gbc.gridheight = 2;
        gbc.weightx = /*gbc.weighty = */ 20;
        gbc.insets = new Insets(2, 2, 2, 2);
        add(panel3, gbc); // add component to the ContentPane

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // important
        pack();
        setVisible(true); // important
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() { // important

            @Override
            public void run() {
                BorderPanels borderPanels = new BorderPanels();
            }
        });
    }
}

自定义MigLayout

Answer 2

所有JDK布局都不允许您直接执行此操作。 BoxLayout和GridBagLayout排序允许你这样做。

使用GridBagLayout，您可以指定0到1之间的weightx / y值，它告诉布局管理器如何分配额外的空间。因此，假设您创建的组件的首选大小为80/20，那么它们应该能够以相同的比例增长。

BoxLayout在这方面更容易使用，因为您不需要指定一个特定的约束，它只是按照首选大小的比例调整大小。

对于一个旨在允许您将相对大小指定为简单约束的简单布局管理器，您可以查看Relative Layout。

什么布局接受百分比而不是摆动中的值？

2 个答案: