java - 使用 JTable+focusLost() 错误显示数据

Question

我希望在从多个表中选择任何行时在文本框中正确显示数据。

• 当我右键单击表 1 的任意行时，我会得到 table1: 1。如果我单击表 2 的任何行，我也会得到 table1: 1 (但它应该是 table2: 1。)。
• 当我左键单击表 1 或 2，然后右键单击时，我没有得到任何结果。

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Point;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JTextField;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class FocusTable extends JFrame {

    private JPanel contentPane;
    private JTextField textField; //Show selected row data here
    private JTable table1;
    private JTable table2;
    private JTable table3;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    FocusTable frame = new FocusTable();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public FocusTable() {
        setTitle("Test Focus Lost Table");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        textField = new JTextField();
        contentPane.add(textField, BorderLayout.SOUTH);
        textField.setColumns(10);

        JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
        contentPane.add(tabbedPane, BorderLayout.CENTER);

        //----------------Create JPopupMenu-----------------
        JPopupMenu popupMenu = new JPopupMenu();
        JMenuItem menuItemOpen = new JMenuItem("Show!");
        popupMenu.add(menuItemOpen);
        //---------------------------------------------------

        table1 = new JTable();
        table1.setComponentPopupMenu(popupMenu);
            //Show menu by pressing the right button
        table1.addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {

                if (SwingUtilities.isRightMouseButton( e )) {
                    Point point = e.getPoint();
                    int column = table1.columnAtPoint(point);
                    int row = table1.rowAtPoint(point);
                    table1.changeSelection(row, column, false, false);
                }
            }
        });
            //Clear selected row
        table1.addFocusListener(new FocusAdapter() {
            @Override
            public void focusLost(FocusEvent e) {
                //textField.setText("Focus Lost table 1");
                table1.clearSelection();
            }
        });
            //Default model of Table 1
        table1.setModel(new DefaultTableModel(
            new Object[][] {
                {"table1: 1", null, null, null, null},
                {"table1: 2", null, null, null, null},
                {"table1: 3", null, null, null, null},
                {"table1: 4", null, null, null, null},
                {"table1: 5", null, null, null, null},
                {"table1: 6", null, null, null, null},
                {"table1: 7", null, null, null, null},
                {"table1: 8", null, null, null, null},
                {"table1: 9", null, null, null, null},
            },
            new String[] {
                "New column", "New column", "New column", "New column", "New column"
            }
        )
        @Override
        public boolean isCellEditable(int row, int column) {
           //all cells false
           return false;
        }   
    });
        tabbedPane.addTab("TabTable1", null, table1, null);

        table2 = new JTable();
        table2.setComponentPopupMenu(popupMenu);
            //Show menu by pressing the right button
        table2.addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {

                if (SwingUtilities.isRightMouseButton( e )) {
                    Point point = e.getPoint();
                    int column = table2.columnAtPoint(point);
                    int row = table2.rowAtPoint(point);
                    table2.changeSelection(row, column, false, false);
                }
            }
        });
            //Clear selected row
        table2.addFocusListener(new FocusAdapter() {
            @Override
            public void focusLost(FocusEvent e) {
                //textField.setText("Focus Lost table 2");
                table2.clearSelection();
            }
        });
            //Default model of Table 2
        table2.setModel(new DefaultTableModel(
            new Object[][] {
                {null, "table2: 1", null, null, null},
                {null, "table2: 2", null, null, null},
                {null, "table2: 3", null, null, null},
                {null, "table2: 4", null, null, null},
                {null, "table2: 5", null, null, null},
                {null, "table2: 6", null, null, null},
                {null, "table2: 7", null, null, null},
                {null, "table2: 8", null, null, null},
                {null, "table2: 9", null, null, null},
            },
            new String[] {
                "New column", "New column", "New column", "New column", "New column"
            }
        ){
        @Override
        public boolean isCellEditable(int row, int column) {
           //all cells false
           return false;
        }   
    });
        tabbedPane.addTab("TabTable2", null, table2, null);

        table3 = new JTable(); 
            //Clear selected row when focus lost        
        table3.addFocusListener(new FocusAdapter() {
            @Override
            public void focusLost(FocusEvent e) {
                table2.clearSelection();
            }
        });
            //Show menu by pressing the right button
        table3.addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {

                if (SwingUtilities.isRightMouseButton( e )) {
                    Point point = e.getPoint();
                    int column = table3.columnAtPoint(point);
                    int row = table3.rowAtPoint(point);
                    table3.changeSelection(row, column, false, false);
                }
            }
        });
        //Default model of Table 3
        table3.setModel(new DefaultTableModel(
            new Object[][] {
                {null, null, "table 3: 1", null, null},
                {null, null, "table 3: 2", null, null},
                {null, null, "table 3: 3", null, null},
                {null, null, "table 3: 4", null, null},
                {null, null, "table 3: 5", null, null},
                {null, null, "table 3: 6", null, null},
                {null, null, "table 3: 7", null, null},
                {null, null, "table 3: 8", null, null},
                {null, null, "table 3: 9", null, null},
            },
            new String[] {
                "New column", "New column", "New column", "New column", "New column"
            }
        ){
        @Override
        public boolean isCellEditable(int row, int column) {
           //all cells false
           return false;
        }   
    });
        table3.setComponentPopupMenu(popupMenu);

        tabbedPane.addTab("TabTable3", null, table3, null);

        //---------------------------Checking the selected table-------------------------------
        menuItemOpen.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if(table1.getSelectedRow()!=-1){
                    textField.setText(table1.getValueAt(table1.getSelectedRow(), 0).toString());
                }else if(table2.getSelectedRow()!=-1){
                    textField.setText(table2.getValueAt(table2.getSelectedRow(), 1).toString());
                }else if(table3.getSelectedRow()!=-1){
                    textField.setText(table3.getValueAt(table3.getSelectedRow(), 2).toString());
                }
            }
        });
    }

}

Answer 1

不要摆弄 FocusListener。无需清除表选择。用户不喜欢在从一个选项卡移动到另一个选项卡时行选择消失。因此，摆脱 FocusListener 并保持行选择不变。

相反，您可以通过执行以下操作来获取当前聚焦的表格:

menuItemOpen.addActionListener(new ActionListener()
{
    public void actionPerformed(ActionEvent e)
    {

        JMenuItem mi = (JMenuItem)e.getSource();
        JPopupMenu popup = (JPopupMenu)mi.getParent();
        JTable table = (JTable)popup.getInvoker();

        if (table.equals(table1))
        {
            textField.setText(table1.getValueAt(table1.getSelectedRow(), 0).toString());
        }
        else if (table.equals(table2))
        {
            textField.setText(table2.getValueAt(table2.getSelectedRow(), 1).toString());
        }
        else if (table.equals(table3))
        {
            textField.setText(table3.getValueAt(table3.getSelectedRow(), 2).toString());
        }
    }
});