Question

我正在尝试将JScrollPane放到JTable Miglayout但是如果我编译它，JScrollpane不起作用（所以没有箭头等......）。

这是我的代码：

public class MyTableModel extends AbstractTableModel {
    final String[] cols = {"", "", ""};
    final Object[][] data = {
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
            {new ImageIcon(), new String(), new String(), new JPanel()},
    };

    public int setRowHeight() {
        return 50;
    }

    public int getColumnCount() {
        return cols.length;
    }

    public int getRowCount() {
        return data.length;
    }

    public String getColumnName(int col) {
        return cols[col];
    }

    public Object getValueAt(int row, int col) {
        return data[row][col];
    }

    public Class getColumnClass(int c) {
        return getValueAt(0, c).getClass();
    }

    public boolean isCellEditable(int row, int col) {
        return false;
    }

    public void setValueAt(Object value, int row, int col) {
        data[row][col] = value;
        fireTableCellUpdated(row, col);
        System.out.println("setVal" + value); // da sind die Daten!
    }

    static void create() {
        MigLayout layout = new MigLayout("debug,fill");
        JFrame f = new JFrame();
        JPanel p = new JPanel();

        //Button
        JButton addRow = new JButton("Add Row");
        addRow.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                System.out.println("test OK");
            }
        });

        p.setLayout(layout);
        p.setBackground(Color.RED);

        MyTableModel mod = new MyTableModel();

        JTable table = new JTable(mod);

        JScrollPane pane = new JScrollPane(table);

        JTableHeader tableHeader = table.getTableHeader();

        tableHeader.setReorderingAllowed(false);
        tableHeader.setResizingAllowed(true);

        table.setValueAt(new ImageIcon("C:\\redIcon.png"), 0, 2);
        table.setRowHeight(40);

        p.add(tableHeader, "dock north");
        p.add(table, "dock center");
        p.add(pane, "dock east");

        f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
        f.setLocationRelativeTo(null);
        f.setSize(600, 300);
        f.setContentPane(p);
        f.setVisible(true);
    }

    public static void main(String[] Args) {
        create();
    }
}

Answer 1

在滚动窗格下面插入这两行：

pane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
pane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);

这会为上/下和左/右添加滚动条。

但是你的代码有点复杂，很难看出你真正想要实现的目标。特别是你添加了很多很多JPanels的部分看起来很奇怪而且看起来很不错。

Answer 2

JTable table = new JTable(mod);
JScrollPane pane = new JScrollPane(table);
JTableHeader tableHeader = table.getTableHeader();
//...
p.add(tableHeader, "dock north");
p.add(table, "dock center");
p.add(pane, "dock east");

这些组件不会那样工作......

tableHeader是表格的一部分，你不能只是把它撕下来＃34;并在其他地方独立呈现。

该表已添加到scrollPane中，然后将scrollPane和表分别添加到不同位置没有意义。

JTable table = new JTable(mod);
JScrollPane pane = new JScrollPane(table);
//...
p.add(pane, "dock center");

应该只需要做 - 将表格添加到scrollPane，然后将scrollPane添加到面板的中心。

JScrollPane不起作用（MigLayout）

2 个答案: