Java Eclipse Jtable 单元格/列

Question

对于 Java Kepler Eclipse 和 Jtable，我试图做到这一点，以便在选择特定表格单元格时，该单元格将用作 editorPane；或者让整个专栏作为 editorPane 工作。当我单击 COMMENTS 列上的一个单元格时，它会放大该行，但我无法让它作为 editorPane 工作。我的项目实际上非常不同，但我用表格编写了这个迷你项目，因此您可以复制、粘贴并运行它以查看当您单击 COMMENTS 单元格时到底出现了什么问题。

我试图让该列成为一个 editorPane，就像我用 checkBox 使列完成一样，但它不起作用或者我做错了。我也试过 cellRenderer，但我也无法让它工作。

无论是整个列用作 editorPane 还是仅用作选定的单元格都没有关系，只要它能工作就更容易

import javax.swing.*;
import javax.swing.table.*;    
import java.awt.*;
public class JavaTestOne {
    JFrame frmApp;
    private JTable table;
    private JCheckBox checkbox;
    DefaultTableModel model;
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    JavaTestOne window = new JavaTestOne();
                    window.frmApp.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });  
    }
    public JavaTestOne() {  
        initialize();
    }
    private void initialize() {
        frmApp = new JFrame();
        frmApp.getContentPane().setFont(new Font("Tahoma", Font.PLAIN, 13));
        frmApp.setBounds(50, 10, 1050, 650);
        frmApp.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frmApp.getContentPane().setLayout(new CardLayout(0, 0));
        frmApp.setTitle("App");
        {
            JScrollPane scrollPane = new JScrollPane();
            scrollPane.setBounds(0, 42, 984, 484);
            frmApp.add(scrollPane);
            {
                table = new JTable();
                table.setFillsViewportHeight(true);
                Object[][] data = {
                        {"I01", "Tom",new Boolean(false), ""},
                        {"I02", "Jerry",new Boolean(false), ""},
                        {"I03", "Ann",new Boolean(false), ""}};
                String[] cols = {"ID","NAME","DONE","COMMENTS"};
                model = new DefaultTableModel(data, cols) {
                    private static final long serialVersionUID = -7158928637468625935L;

                    public Class getColumnClass(int column) {
                        return getValueAt(0, column).getClass();
                    }
                };
                table.setModel(model);
                table.setRowHeight(20);

                table.addMouseListener(new java.awt.event.MouseAdapter() {
                    public void mouseClicked(java.awt.event.MouseEvent evt) {
                        int row = table.rowAtPoint(evt.getPoint());
                        int col = table.columnAtPoint(evt.getPoint());
                        table.setRowHeight(20);
                        if(col==3){
                            table.setRowHeight(row, 100);
                            //this is where I need it to work as an editorPane if it is only for the selected cell
                        }
                    }
                });
                table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
                scrollPane.setViewportView(table);
                checkbox = new JCheckBox("OK");
                checkbox.setHorizontalAlignment(SwingConstants.CENTER);
                checkbox.setBounds(360, 63, 97, 23);
            }
        }
    }
}

Answer 1

另一种方法是显示一个弹出窗口来编辑单元格:

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

/*
 * The editor button that brings up the dialog.
 */
//public class TablePopupEditor extends AbstractCellEditor
public class TablePopupEditor extends DefaultCellEditor
    implements TableCellEditor
{
    private PopupDialog popup;
    private String currentText = "";
    private JButton editorComponent;

    public TablePopupEditor()
    {
        super(new JTextField());

        setClickCountToStart(1);

        //  Use a JButton as the editor component

        editorComponent = new JButton();
        editorComponent.setBackground(Color.white);
        editorComponent.setBorderPainted(false);
        editorComponent.setContentAreaFilled( false );

        // Make sure focus goes back to the table when the dialog is closed
        editorComponent.setFocusable( false );

        //  Set up the dialog where we do the actual editing

        popup = new PopupDialog();
    }

    public Object getCellEditorValue()
    {
        return currentText;
    }

    public Component getTableCellEditorComponent(
        JTable table, Object value, boolean isSelected, int row, int column)
    {

        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                popup.setText( currentText );
//              popup.setLocationRelativeTo( editorComponent );
                Point p = editorComponent.getLocationOnScreen();
                popup.setLocation(p.x, p.y + editorComponent.getSize().height);
                popup.show();
                fireEditingStopped();
            }
        });

        currentText = value.toString();
        editorComponent.setText( currentText );
        return editorComponent;
    }

    /*
    *   Simple dialog containing the actual editing component
    */
    class PopupDialog extends JDialog implements ActionListener
    {
        private JTextArea textArea;

        public PopupDialog()
        {
            super((Frame)null, "Change Description", true);

            textArea = new JTextArea(5, 20);
            textArea.setLineWrap( true );
            textArea.setWrapStyleWord( true );
            KeyStroke keyStroke = KeyStroke.getKeyStroke("ENTER");
            textArea.getInputMap().put(keyStroke, "none");
            JScrollPane scrollPane = new JScrollPane( textArea );
            getContentPane().add( scrollPane );

            JButton cancel = new JButton("Cancel");
            cancel.addActionListener( this );
            JButton ok = new JButton("Ok");
            ok.setPreferredSize( cancel.getPreferredSize() );
            ok.addActionListener( this );

            JPanel buttons = new JPanel();
            buttons.add( ok );
            buttons.add( cancel );
            getContentPane().add(buttons, BorderLayout.SOUTH);
            pack();

            getRootPane().setDefaultButton( ok );
        }

        public void setText(String text)
        {
            textArea.setText( text );
        }

        /*
        *   Save the changed text before hiding the popup
        */
        public void actionPerformed(ActionEvent e)
        {
            if ("Ok".equals( e.getActionCommand() ) )
            {
                currentText = textArea.getText();
            }

            textArea.requestFocusInWindow();
            setVisible( false );
        }
    }

    private static void createAndShowUI()
    {
        String[] columnNames = {"Item", "Description"};
        Object[][] data =
        {
            {"Item 1", "Description of Item 1"},
            {"Item 2", "Description of Item 2"},
            {"Item 3", "Description of Item 3"}
        };

        JTable table = new JTable(data, columnNames);
        table.getColumnModel().getColumn(1).setPreferredWidth(300);
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane = new JScrollPane(table);

        // Use the popup editor on the second column

        TablePopupEditor popupEditor = new TablePopupEditor();
        table.getColumnModel().getColumn(1).setCellEditor( popupEditor );

        JFrame frame = new JFrame("Popup Editor Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new JTextField(), BorderLayout.NORTH);
        frame.add( scrollPane );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }

}

使用这种方法，您不必不断地操纵行大小。您甚至可以自定义代码，使对话框适合单元格的宽度并显示在单元格下方。