调整 JTable 大小以适合行数

Question

我有一个JTable将动态填充的表，我希望表始终调整大小以适应行数。我不需要任何滚动，因为表格位于面板中，并且需要打印面板的内容。我试过这个：

Dimension d = itemsTable.getPreferredSize();
    //scrollPane.setPreferredSize(new Dimension(d.width,itemsTable.getRowHeight()*itemsTable.getRowCount()+10));
    itemsTable.setPreferredScrollableViewportSize(new Dimension(d.width,itemsTable.getRowHeight()*itemsTable.getRowCount()+1))

但这似乎不起作用。

public void getDetails(PosView pv){
    Connection con = con();
    DefaultTableModel model = (DefaultTableModel)pv.getItemsTable().getModel();
    String date = null;
    double total = 0.0, paid = 0.0;
    try{
        ps = con.prepareStatement("SELECT DISTINCT AMOUNT_PAYABLE, AMOUNT_PAID, BALANCE, DATE FROM SALES WHERE PAYMENT_ID = ?");
        ps.setString(1, paymentId);
        rs = ps.executeQuery();
        while(rs.next()){
            total = (rs.getDouble(1));
            paid += (rs.getDouble(2));
            date = rs.getString(4);
        }
        double balance = total - paid;
        pv.setDate(date);
        pv.setPaymentId(paymentId);

        ps = con.prepareStatement("SELECT QUANTITY, ITEM_NAME, SELLING_PRICE, TOTAL FROM ITEMS_BOUGHT WHERE ID = ?");
        ps.setString(1, paymentId);
        rs = ps.executeQuery();
        while(rs.next()){
            Object data[] = {rs.getInt(1), rs.getString(2), rs.getDouble(3),rs.getDouble(4)};
            model.addRow(data);
        }

        logActivity(userId, "PAYMENT RECEIPT "+ paymentId +" GENERATED", con);
        pv.setTotal(total);
        pv.setPaid(paid);
        pv.setBalance(balance);
    }catch(SQLException e){
        showMessageDialog(null, e.getMessage());
    }finally{
        try {
            if(ps!=null)
                ps.close();
            con.close();
        }catch(Exception e){}
    }
}

Answer 1

覆盖getPreferredScrollableViewportSize()以返回行高和行数乘积的倍数。每次添加一行时，都会pack()显示封闭的窗口。

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;

/**
 * @see http://stackoverflow.com/a/37343900/230513
 * @see http://stackoverflow.com/a/37318673/230513
 */
public class Test {

    private void display() {
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        class MyTableModel extends AbstractTableModel {

            private int n = 8;

            private void addRow() {
                n++;
                fireTableRowsInserted(n - 1, n - 1);
            }

            @Override
            public int getRowCount() {
                return n;
            }

            @Override
            public int getColumnCount() {
                return 4;
            }

            @Override
            public Object getValueAt(int rowIndex, int colIndex) {
                return "R" + rowIndex + ":C" + colIndex;
            }
        };
        MyTableModel model = new MyTableModel();
        JTable table = new JTable(model) {
            @Override
            public Dimension getPreferredScrollableViewportSize() {
                return new Dimension(super.getPreferredSize().width,
                    getRowHeight() * getRowCount());
            }
        };
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        f.add(new JScrollPane(table));
        f.add(new JButton(new AbstractAction("Add Row") {
            @Override
            public void actionPerformed(ActionEvent e) {
                model.addRow();
                f.pack();
            }
        }), BorderLayout.SOUTH);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Test()::display);
    }
}