添加的JPanel到JScrollPane中(Adding JPanel to JScrollPan

我有一个具有包含标签和TextField的序列，并使用弹簧的布局（这是mainPanel中），并且只包含一个按钮（buttonPanel）另一面板的面板的GUI。 我试图让我的mainPanel有一个垂直滚动条为好。 我想实现我的GUI使得JFrame的内我有2个面板。 mainPanel中出现在框架的顶部和buttonPanel出现mainPanel中的下方。

我的问题是我不能够让面板出现使得buttonPanel是下面的mainPanel，我还不能确定如何将滚动条添加到mainPanel中。 任何帮助，将不胜感激。

编辑：我能解决我的关于JPanels问题，现在我唯一的问题是，我不能让我的mainPanel滚动。 我已经添加了我的下面最近的代码：

这里是我到目前为止的代码：

public static void main(String args[]) {


            JFrame frame = new JFrame("SpringLayout");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JScrollPane scroll = new JScrollPane();
            Container contentPane = frame.getContentPane();

           JButton next = new JButton("Next");
           JPanel buttonPanel = new JPanel();
           buttonPanel.add(next);
            SpringLayout layout = new SpringLayout();
            JPanel mainPanel = new JPanel();
            mainPanel.setLayout(layout);
            contentPane.setLayout(new BorderLayout());


            int j = 25;
            for(int i =0;i<150;i++){
                JLabel label = new JLabel("Enter Name " + i );
                JTextField text = new JTextField(15);

            mainPanel.add(label);
            mainPanel.add(text);
            layout.putConstraint(SpringLayout.WEST, label, 10, SpringLayout.WEST,
                            contentPane);
            layout.putConstraint(SpringLayout.NORTH, label, j, SpringLayout.NORTH,
                            contentPane);
            layout.putConstraint(SpringLayout.NORTH, text, j, SpringLayout.NORTH,
                            contentPane);
            layout.putConstraint(SpringLayout.WEST, text, 20, SpringLayout.EAST,
                            label);
            j+=30;
            }
            //mainPanel.setSize(500,800);
            scroll.setPreferredSize(new Dimension(500,500));
            scroll.setViewportView(mainPanel);
            contentPane.add(scroll);
            contentPane.add(buttonPanel,BorderLayout.SOUTH);
            //mainWindow.add(contentPane);
            frame.setSize(500, 600);
            frame.setVisible(true);



        }

Answer 1:

为了使滚动我只是需要增加我的mainPanel的最佳尺寸，使得它会比更大的滚动条。

 public static void main(String args[]) {
                JFrame frame = new JFrame("SpringLayout");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                JScrollPane scroll = new JScrollPane();
                Container contentPane = frame.getContentPane();

               JButton next = new JButton("Next");
               JPanel buttonPanel = new JPanel();
               buttonPanel.add(next);
                SpringLayout layout = new SpringLayout();
                JPanel mainPanel = new JPanel();
                mainPanel.setLayout(layout);
                contentPane.setLayout(new BorderLayout());


                int j = 25;
                for(int i =0;i<18;i++){
                    JLabel label = new JLabel("Enter Name " + i );
                    JTextField text = new JTextField(15);

                mainPanel.add(label);
                mainPanel.add(text);
                layout.putConstraint(SpringLayout.WEST, label, 10, SpringLayout.WEST,
                                contentPane);
                layout.putConstraint(SpringLayout.NORTH, label, j, SpringLayout.NORTH,
                                contentPane);
                layout.putConstraint(SpringLayout.NORTH, text, j, SpringLayout.NORTH,
                                contentPane);
                layout.putConstraint(SpringLayout.WEST, text, 20, SpringLayout.EAST,
                                label);
                j+=30;
                }
                mainPanel.setPreferredSize(new Dimension(mainPanel.getWidth(), 1500));
                scroll.setPreferredSize(new Dimension(500,500));
                scroll.setViewportView(mainPanel);
                contentPane.add(scroll);
                contentPane.add(buttonPanel,BorderLayout.SOUTH);
                //mainWindow.add(contentPane);
                frame.setSize(500, 600);
                frame.setVisible(true);
        }

Answer 2:

• 我不能评论什么的，尝试和比较

• 注意到这一刻我不明白为什么SpringLayout和JFrame#pack()没有建立基于正确的GUI PreferredSize ，颠簸，这看起来像如（在这一刻）我的问题太

用硬编码的码JFrame.setSize()而不是正确JFrame#pack()

import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SpringLayout;
import javax.swing.SwingUtilities;

public class Main {

    public Main() {
        JFrame frame = new JFrame("SpringLayout");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton next = new JButton("Next");
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(next);
        SpringLayout layout = new SpringLayout();
        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(layout);
        int j = 25;
        for (int i = 0; i < 5; i++) {
            JLabel label = new JLabel("Enter Name");
            JTextField text = new JTextField(15);
            layout.putConstraint(SpringLayout.WEST, label, 10, SpringLayout.WEST,
                    mainPanel);
            layout.putConstraint(SpringLayout.NORTH, label, j, SpringLayout.NORTH,
                    mainPanel);
            layout.putConstraint(SpringLayout.NORTH, text, j, SpringLayout.NORTH,
                    mainPanel);
            layout.putConstraint(SpringLayout.WEST, text, 20, SpringLayout.EAST,
                    label);
            j += 30;
            mainPanel.add(label);
            mainPanel.add(text);
        }
        frame.add(mainPanel, BorderLayout.CENTER);
        frame.add(buttonPanel, BorderLayout.SOUTH);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }

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

            @Override
            public void run() {
                 Main mn = new Main();
            }
        });
    }
}

Answer 3:

这是我会怎么做：

public static void main(String args[]) {
    JFrame frame = new JFrame("SpringLayout");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();

    JButton next = new JButton("Next");
    JPanel buttonPanel = new JPanel();
    buttonPanel.add(next);
    GridBagLayout layout = new GridBagLayout();
    JPanel mainPanel = new JPanel();
    mainPanel.setLayout(layout);
    contentPane.setLayout(new BorderLayout());

    GridBagConstraints gbc = new GridBagConstraints();

    int j = 25;
    for (int i = 0; i < 50; i++) {
        JLabel label = new JLabel("Enter Name (" + i + ")");
        JTextField text = new JTextField(15);

        gbc.gridx = 0;
        gbc.gridy = i;

        mainPanel.add(label, gbc);

        gbc.gridx = 1;
        mainPanel.add(text, gbc);
    }
    contentPane.add(new JScrollPane(mainPanel, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED), BorderLayout.CENTER);
    contentPane.add(buttonPanel, BorderLayout.SOUTH);
    frame.setSize(500, 800);
    frame.setVisible(true);
}

一些修改：*使用GridBagLayout的，而不是SpringLayout中（只是因为我不知道SpringLayout中）*换一个JScrollPane内您的mainPanel

不看，准确地感觉你的榜样。 GridBagConstraints的可微调。

文章来源: Adding JPanel to JScrollPane