为什么 GridBagLayout 会提供奇怪的结果？

Question

我希望各种组件展开并填满整个窗口。

您尝试过其他方法吗？ 是的，我尝试了GridLayout，但按钮看起来很大。我还尝试了pack()，它使窗口变小了。窗口应该是 750x750 :)

我正在尝试的是：

顶部的这 4 个按钮作为细条

带有JPanels 的滚动窗格将包含所有视频转换任务。这样占用空间最大

底部的JPanel 包含JProgressBar 作为细条。

但是好像有什么地方搞砸了。 请帮我解决这个问题

SSCCE

import java.awt.*;
import javax.swing.*;
import com.explodingpixels.macwidgets.*;

public class HudTest {
    public static void main(String[] args) {
        HudWindow hud = new HudWindow("Window");
        hud.getJDialog().setSize(750, 750);
        hud.getJDialog().setLocationRelativeTo(null);
        hud.getJDialog().setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        JPanel buttonPanel = new JPanel(new FlowLayout());


        JButton addVideo = HudWidgetFactory.createHudButton("Add New Video");
        JButton removeVideo = HudWidgetFactory.createHudButton("Remove Video");
        JButton startAll = HudWidgetFactory.createHudButton("Start All Tasks");
        JButton stopAll = HudWidgetFactory.createHudButton("Stop All Tasks");

        buttonPanel.add(addVideo);
        buttonPanel.add(startAll);
        buttonPanel.add(removeVideo);
        buttonPanel.add(stopAll);

        JPanel taskPanel = new JPanel(new GridLayout(0,1));
        JScrollPane taskScrollPane = new JScrollPane(taskPanel);
        IAppWidgetFactory.makeIAppScrollPane(taskScrollPane);
        for(int i=0;i<10;i++){
            ColorPanel c = new ColorPanel();
            c.setPreferredSize(new Dimension(750,100));
            taskPanel.add(c);
        }

        JPanel progressBarPanel = new JPanel();

        JComponent component = (JComponent) hud.getContentPane();
        component.setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        Insets in = new Insets(2,2,2,2);

        gbc.insets = in;
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 10;
        gbc.gridheight = 1;
        gbc.fill = GridBagConstraints.BOTH;
        component.add(buttonPanel,gbc);

        gbc.gridy += 1;
        gbc.gridheight = 17;
        component.add(taskScrollPane,gbc);

        gbc.gridy += 17;
        gbc.gridheight = 2;
        component.add(progressBarPanel,gbc);

        hud.getJDialog().setVisible(true);
    }
}

Answer 1

使用这个

gbc.weightx = 1;
gbc.weighty = 1;
gbc.fill = GridbagConstraints.BOTH

Answer 2

为什么不简单地将三个JPanels 放在一个JPanel 上，BorderLayout 为Layout Manager，其中中间的JPanel 以及所有具有各自尺寸的自定义面板都可以容纳在JScrollPane 内，如下例所示：

import javax.swing.*;
import java.awt.*;
import java.util.Random;

/**
 * Created with IntelliJ IDEA.
 * User: Gagandeep Bali
 * Date: 5/17/13
 * Time: 6:09 PM
 * To change this template use File | Settings | File Templates.
 */
public class PlayerBase
{
    private JPanel contentPane;
    private JPanel buttonPanel;
    private JPanel centerPanel;
    private CustomPanel[] colourPanel;
    private JPanel progressPanel;

    private JButton addVideoButton;
    private JButton removeVideoButton;
    private JButton startAllButton;
    private JButton stopAllButton;

    private JProgressBar progressBar;

    private Random random;

    public PlayerBase()
    {
        colourPanel = new CustomPanel[10];

        random = new Random();
    }

    private void displayGUI()
    {
        JFrame playerWindow = new JFrame("Player Window");
        playerWindow.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        contentPane = new JPanel(new BorderLayout(5, 5));
        contentPane.setBorder(
                BorderFactory.createEmptyBorder(5, 5, 5, 5));
        buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 5, 5));
        addVideoButton = new JButton("Add New Video");
        removeVideoButton = new JButton("Remove Video");
        startAllButton = new JButton("Start all tasks");
        stopAllButton = new JButton("Stop all tasks");

        buttonPanel.add(addVideoButton);
        buttonPanel.add(removeVideoButton);
        buttonPanel.add(startAllButton);
        buttonPanel.add(stopAllButton);

        contentPane.add(buttonPanel, BorderLayout.PAGE_START);

        JScrollPane scroller = new JScrollPane();
        centerPanel = new JPanel(new GridLayout(0, 1, 2, 2));
        for (int i = 0; i < colourPanel.length; i++)
        {
            colourPanel[i] = new CustomPanel(new Color(
                    random.nextInt(255), random.nextInt(255)
                    , random.nextInt(255)));
            centerPanel.add(colourPanel[i]);
        }
        scroller.setViewportView(centerPanel);

        contentPane.add(scroller, BorderLayout.CENTER);

        progressPanel = new JPanel(new BorderLayout(5, 5));
        progressBar = new JProgressBar(SwingConstants.HORIZONTAL);
        progressPanel.add(progressBar);

        contentPane.add(progressPanel, BorderLayout.PAGE_END);

        playerWindow.setContentPane(contentPane);
        playerWindow.pack();
        //playerWindow.setSize(750, 750);
        playerWindow.setLocationByPlatform(true);
        playerWindow.setVisible(true);
    }

    public static void main(String[] args)
    {
        Runnable runnable = new Runnable()
        {
            @Override
            public void run()
            {
                new PlayerBase().displayGUI();
            }
        };
        EventQueue.invokeLater(runnable);
    }
}

class CustomPanel extends JPanel
{
    public CustomPanel(Color backGroundColour)
    {
        setOpaque(true);
        setBackground(backGroundColour);
    }

    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(750, 100));
    }
}

输出：