Java 如何在右击时 Select 新行

发布于10月25日

我正在编写一个数据库记录器程序.在用户单击新行之后，我想指向该行.这样，当用鼠标右键点击打开弹出菜单时，用户就可以知道是排在哪行了.

这是我的程序的图形用户界面:

我try 了以下代码:

tbl_patika_list.addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                Point point = e.getPoint();
                int clickedRow = tbl_patika_list.rowAtPoint(point);
                tbl_patika_list.clearSelection();
                tbl_patika_list.setRowSelectionInterval(clickedRow,clickedRow);
            }
        });

推荐答案

使用鼠标右键单击打开弹出菜单.

老方法是使用鼠标侦听器来显示弹出窗口.

较新的方法是使用setComponentPopup(...)方法:

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

public class TableRightClick extends JPanel implements ActionListener
{
    JPopupMenu popup;

    public TableRightClick()
    {
        popup = new JPopupMenu();
        JMenuItem menuItem = new JMenuItem("Click Me");
        menuItem.addActionListener( this );
        popup.add( menuItem );

        JTable table = new JTable(10, 5);
        table.setComponentPopupMenu( popup );
        popup.addPopupMenuListener(new PopupMenuListener()
        {
            @Override
            public void popupMenuWillBecomeVisible(PopupMenuEvent e)
            {
                SwingUtilities.invokeLater(() ->
                {
                    Point point = SwingUtilities.convertPoint(popup, new Point(0, 0), table);
                    int currentRow = table.rowAtPoint(point);
                    int currentColumn = table.columnAtPoint(point);
                    table.changeSelection(currentRow, currentColumn, false, false);
                });
            }

            @Override
            public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {}

            @Override
            public void popupMenuCanceled(PopupMenuEvent e) {}
        });
/*
        //  When using a MouseListener to show popup menu
        table.addMouseListener( new MouseAdapter()
        {
            @Override
            public void mouseReleased(MouseEvent e)
            {
                if (e.isPopupTrigger())
                {
                    JTable source = (JTable)e.getSource();
                    int row = source.rowAtPoint( e.getPoint() );
                    int column = source.columnAtPoint( e.getPoint() );

                    source.changeSelection(row, column, false, false);

                    popup.show(e.getComponent(), e.getX(), e.getY());
                }
            }
        });
*/

        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        add( new JScrollPane(table) );
    }

    public void actionPerformed(ActionEvent e)
    {
        Component c = (Component)e.getSource();
        JPopupMenu popup = (JPopupMenu)c.getParent();
        JTable table = (JTable)popup.getInvoker();
        System.out.println(table.getSelectedRow() + " : " + table.getSelectedColumn());
    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("Table Right Click");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new TableRightClick());
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args) throws Exception
    {
        java.awt.EventQueue.invokeLater( () -> createAndShowGUI() );
    }
}