java - JTabBar 中的 JPanel 不可滚动

Question

在此处输入代码我遇到了以下问题。

我正在向一个面板添加两个 JPanel，最后将其添加到我的 TabbedPane。但是，我想让它可以滚动，因此我只是让面板可以滚动，这只是在栏的中间添加了我的滚动条。

这是我的例子:

public class Test extends JFrame {

    private static final long serialVersionUID = -4682396888922360841L;    
    private JMenuBar menuBar;    
    private JMenu mAbout;    
    private JMenu mMain;    
    private JTabbedPane tabbedPane;    
    public SettingsTab settings = new SettingsTab();

    private void addMenuBar() {    
        menuBar = new JMenuBar();    
        mMain = new JMenu("Main");
        mAbout = new JMenu("About");    
        menuBar.add(mMain);
        menuBar.add(mAbout);    
        setJMenuBar(menuBar);    
    }

    public void createTabBar() {    
        tabbedPane = new JTabbedPane(JTabbedPane.TOP);    
        JComponent panel2 = new JPanel();
        tabbedPane.addTab("Test1", null, panel2,
                "Displays the results");    
        tabbedPane.addTab("Settings", settings.createLayout());    
        add(tabbedPane);    
        tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);    
    }

    private void makeLayout() {    
        setTitle("Test");
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(1000, 500));    
        addMenuBar();
        createTabBar();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);    
    }    

    public void start() {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                makeLayout();   
            }
        });
    }

    public static void main(String[] args) {    
        Test gui = new Test();
        gui.start();    
    }

    public class SettingsTab extends JPanel {        
        public JPanel createLayout() {
            JPanel panel = new JPanel();    
            panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));    
            panel.add(table1());
            panel.add(Box.createRigidArea(new Dimension(0,10)));
            panel.add(table2());
            panel.add(Box.createRigidArea(new Dimension(0,10)));                
            panel.add(new JScrollBar());    
            return panel;
        }

        public JPanel table1() {
            JPanel panel1 = new JPanel();    
            String[] columnNames = {"First Name", "Last Name"};    
            Object[][] data = {{"Kathy", "Smith"}, {"John", "Doe"},
                    {"Sue", "Black"}, {"Jane", "White"}, {"Joe", "Brown"}
            };    
            final JTable table = new JTable(data, columnNames);    
            panel1.add(table);    
            panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));    
            return panel1;
        }

        public JPanel table2() {
            JPanel panel1 = new JPanel();    
            String[] columnNames = {"First Name", "Last Name"};    
            Object[][] data = { {"Kathy", "Smith"}, {"John", "Doe"},
                    {"Sue", "Black"}, {"Jane", "White"}, {"Joe", "Brown"}
            };    
            final JTable table = new JTable(data, columnNames);
            table.setPreferredScrollableViewportSize(new Dimension(500, 70));
            table.setFillsViewportHeight(true);    
            panel1.add(table);    
            panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));    
            return panel1;
        }
    }
}

对我做错了什么有什么建议吗？

感谢您的回复!

更新

我用 JScrollPane 试过了，但还是不行:

public class Test extends JFrame {

    private static final long serialVersionUID = -4682396888922360841L;

    private JMenuBar menuBar;

    private JMenu mAbout;

    private JMenu mMain;

    private JTabbedPane tabbedPane;

    public SettingsTab settings = new SettingsTab();

    private void addMenuBar() {

        menuBar = new JMenuBar();

        mMain = new JMenu("Main");
        mAbout = new JMenu("About");

        menuBar.add(mMain);
        menuBar.add(mAbout);

        setJMenuBar(menuBar);

    }

    public void createTabBar() {

        tabbedPane = new JTabbedPane(JTabbedPane.TOP);

        JComponent panel2 = new JPanel();
        tabbedPane.addTab("Test1", null, panel2,
                "Displays the results");

        tabbedPane.addTab("Settings", settings.createLayout());

        add(tabbedPane);

        tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);

    }

    private void makeLayout() {

        setTitle("Test");
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(1000, 500));

        addMenuBar();
        createTabBar();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);

    }


    public void start() {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                makeLayout();   
            }
        });
    }

    public static void main(String[] args) {

        Test gui = new Test();
        gui.start();

    }

    public class SettingsTab extends JScrollPane {


        public JPanel createLayout() {
            JPanel panel = new JPanel();

            panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

            panel.add(table1());
            panel.add(Box.createRigidArea(new Dimension(0,10)));
            panel.add(table2());
            panel.add(Box.createRigidArea(new Dimension(0,10)));
            panel.add(table3());
            panel.add(Box.createRigidArea(new Dimension(0,10)));

            add(new JScrollPane());

            return panel;
        }

        public JPanel table1() {
            JPanel panel1 = new JPanel();

            String[] columnNames = {"First Name",
            "Last Name"};

            Object[][] data = {
                    {"Kathy", "Smith"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"}
            };

            final JTable table = new JTable(data, columnNames);

            panel1.add(table);

            panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));

            return panel1;
        }

        public JPanel table2() {
            JPanel panel1 = new JPanel();

            String[] columnNames = {"First Name",
            "Last Name"};

            Object[][] data = {
                    {"Kathy", "Smith"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"}
            };

            final JTable table = new JTable(data, columnNames);
            table.setPreferredScrollableViewportSize(new Dimension(500, 70));
            table.setFillsViewportHeight(true);

            panel1.add(table);

            panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));

            return panel1;
        }

        public JPanel table3() {
            JPanel panel1 = new JPanel();

            String[] columnNames = {"First Name",
            "Last Name"};

            Object[][] data = {
                    {"Kathy", "Smith"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"},
                    {"John", "Doe"},
                    {"Sue", "Black"},
                    {"Jane", "White"},
                    {"Joe", "Brown"}
            };

            final JTable table = new JTable(data, columnNames);
            table.setPreferredScrollableViewportSize(new Dimension(500, 70));
            table.setFillsViewportHeight(true);

            panel1.add(table);

            panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));

            return panel1;
        }
    }
}

Answer 1

必须在上面加一个JScrollPane! :)

我真的不知道你在那里做了什么，但基本上是这样的:

JPanel myPanel = new JPanel(); // the main content is on the myPanel
myPanel.add(myContent);// add everything you want

new JFrame().add(new JScrollPane(myPanel));