将JPanel添加到JScrollPane [英] Adding JPanel to JScrollPane

问题描述

我有一个gui，它的Panel包含一系列标签和TextField，并使用弹性布局(这是mainPanel)，而另一个Panel仅包含button(buttonPanel).我正在尝试使我的mainPanel也具有垂直滚动条.我想实现我的GUI，以便在JFrame中有2个面板. mainPanel出现在框架的顶部，而buttonPanel出现在mainPanel的下方.

I have a gui which has a Panel that contains a sequence of labels and TextFields and uses a spring layout(this is the mainPanel) and another Panel that just contains a button(buttonPanel). I am trying to make my mainPanel to have a vertical scrollbar as well. I would like to implement my GUI such that within the JFrame I have 2 panels. The mainPanel appears on the top of the frame and the buttonPanel appears below the mainPanel.

我的问题是我无法使面板出现，使得buttonPanel在mainPanel下方，并且我也不确定如何向mainPanel添加滚动条.任何帮助，将不胜感激.

My problem is I am not able to make the Panels appear such that the buttonPanel is below the mainPanel and I am also not sure how to add a scrollbar to the mainPanel. Any help would be appreciated.

我能够解决有关JPanels的问题，现在唯一的问题是我无法使mainPanel滚动.我在下面添加了我的最新代码:

EDIT : I was able to solve my issue regarding the JPanels, now my only problem is that I cant get my mainPanel to scroll. I've added my most recent code below :

这是我到目前为止的代码:

Here is the code I have so far:

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);



        }

推荐答案

要使其可滚动，我只需要增大mainPanel的首选大小，使其大于滚动条即可.

To make it scrollable I just needed to increase the preferred size of my mainPanel such that it would be bigger than the scrollbar.

 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);
        }

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