java - 防止 JTable 双击时自动排序

Question

我有一个 JTable，它具有使用自定义 RowSorter 进行排序的列。我假设 RowSorter 类自动将自身作为 MouseListener 添加到表的 ColumnHeader 中，因为它会自动执行排序，而无需我添加任何自定义鼠标监听代码。这非常有效。

我还添加了一些代码(基于 this example )，允许用户通过双击列标题中表格列之间的空间来调整表格列的大小(模仿 Excel 的行为)。问题是，当用户双击标题来调整列大小时，它也会对该列进行排序。 我只想在单击标题时对列进行排序。

我的第一个方法是使用 Java 接口(interface) Proxy 来替换 JTable 的所有现有 MouseListener，拦截事件，并且仅传递与单击相关的事件。不过，这似乎有点矫枉过正。有更好的办法吗？

Answer 1

My first approach was to use Java interface Proxy's to replace all of the existing MouseListeners of the JTable, intercept the events, and only pass on events related to single clicks.

这基本上就是它的工作原理:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;

public class ResizeColumnListener implements MouseListener
{
    private static Cursor resizeCursor = Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR);

    private MouseListener uiListener;
    private JTableHeader header;
    private TableColumnAdjuster tca;

    public ResizeColumnListener(JTable table)
    {
        header = table.getTableHeader();
        tca = new TableColumnAdjuster( table );

        MouseListener[] listeners = header.getMouseListeners();

        for (MouseListener ml: listeners)
        {
            String className = ml.getClass().toString();

            if (className.contains("BasicTableHeaderUI"))
            {
                uiListener = ml;
                header.removeMouseListener(ml);
                header.addMouseListener( this );
            }
        }
    }

    @Override
    public void mouseClicked( MouseEvent e )
    {
        if (header.getCursor() != resizeCursor)
        {
            uiListener.mouseClicked( e );
            return;
        }

        //  Handle the double click event to resize the column
        //  Note: The last 3 pixels + 3 pixels of next column are for resizing,
        //  so we need to adjust the mouse point to get the actual column.

        if (e.getClickCount() == 2)
        {
            Point p = e.getPoint();
            p.x -= 3;
            int column = header.columnAtPoint( p );
            tca.adjustColumn( column );

            //  Generate event to reset the cursor

            header.dispatchEvent(new MouseEvent(
                header,
                MouseEvent.MOUSE_MOVED,
                e.getWhen(),
                e.getModifiers(),
                e.getX(),
                e.getY(),
                0,
                false));
        }
    }

    @Override
    public void mouseEntered( MouseEvent e )
    {
        uiListener.mouseEntered( e );
    }

    @Override
    public void mouseExited( MouseEvent e )
    {
        uiListener.mouseExited( e );
    }

    @Override
    public void mousePressed( MouseEvent e )
    {
        uiListener.mousePressed( e );
    }

    @Override
    public void mouseReleased( MouseEvent e )
    {
        uiListener.mouseReleased( e );
    }

    public static void main(String[] args)
    {
        try
        {
//          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        }
        catch (Exception e) { }

        DefaultTableModel model = new DefaultTableModel(5, 5);
        model.setValueAt("Row 0 : Column 0", 0, 0);
        model.setValueAt("Row 1 : Column 1", 1, 1);
        model.setValueAt("Row 2 : Column 2", 2, 2);
        model.setValueAt("Row 3 : Column 3", 3, 3);
        model.setValueAt("Row 4 : Column 4", 4, 4);

        JTable table = new JTable( model );
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        table.setAutoCreateRowSorter(true);
        JScrollPane scrollPane = new JScrollPane( table );

        new ResizeColumnListener(table);

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.add( scrollPane );
        frame.setSize(400, 200);
        frame.setVisible(true);
    }
}

此代码还使用Table Column Adjuster .