Java Eclipse Jtable 单元格/列

Question

对于 Java Kepler Eclipse 和 Jtable，我正在尝试使其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 列上的单元格时，它会放大该行，但我无法将其用作 editorPane。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、粘贴和运行它，以便在单击 COMMENTS 单元格时准确查看问题所在。

我试图使该列成为一个 editorPane，就像我使用复选框使列 DONE 一样，但它不起作用或者我做错了。我也尝试过 cellRenderer，但我也无法做到。

无论是整列作为editorPane还是只作为选定的单元格都无关紧要，只要它更容易，只要它可以工作

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

另一种选择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，您不会不断地操纵行大小。您甚至可以自定义代码以使对话框适合单元格的宽度并显示在单元格下方。

Answer 2

看来您需要实现自己的TableCellEditor，在tutorial 中阅读更多内容。

比如这样：

 private class CustomEditor extends AbstractCellEditor implements TableCellEditor{

    private JTextPane pane = new JTextPane();
    private JScrollPane scroll = new JScrollPane(pane);
    private int row = -1;

    @Override
    public Object getCellEditorValue() {
        return pane.getText();
    }

    @Override
    public Component getTableCellEditorComponent(JTable table,
            Object value, boolean isSelected, int row, int column) {
        if(this.row != -1)
            table.setRowHeight(this.row, 20);
        this.row = row;
        table.setRowHeight(row, 100);
        pane.setText(value == null ? "" : value.toString());
        return scroll;
    }

}

然后将其设置为列编辑器：table.getColumn("COMMENTS").setCellEditor(new CustomEditor());