Question

我创建了一个自定义单元格编辑器，它附加到我的一个JTable列。编辑器有一个JComboBox或一个JTextField作为组件。但是，当我手动编辑组合框的值并按“tab”时，新的 - 最新 - 值不会附加到JTable单元格。相反，旧值被替换。（我已经使用另一个代码模板实现了“tab”行为，但这通常有效，因为所有其他表格单元格都已正确更新）

导致问题的组合框在“案例C”中设置。如果用户现在选择ITEM“Infinity”，则该值成功附加到JTable。但是，如果用户在JTable中手动输入值并按下“tab”，则会丢弃新值，并在表中再次呈现旧值。但是，作为修补程序，如果用户在组合框中输入值，在“THEN”选项卡之后立即点击“ENTER”，则通过jtable正确写入值！

我的自定义单元格编辑器实现如下：

public class CustomCellEditor extends AbstractCellEditor implements TableCellEditor {

    JFrame mParent                  = null;
    JFrame mPopup                   = null;
    String className                = "";

    protected int clickCountToStart = 2;

    private TableCellEditor mEditor = null;
    private JComboBox mComboBox     = null;

    public CustomCellEditor(JFrame parent, String className, JComboBox comboBox) {
        mParent             = parent;
        mClassName          = className;
        mComboBox           = comboBox;
    }

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

        if ( className.equals("case A") ) {

            mComboBox.setModel( new DefaultComboBoxModel(Constants.YES_NO_ARRAY) );
            mComboBox.setEditable(false);
            mEditor = new DefaultCellEditor(mComboBox);
        }
        else if ( className.equals("case B") ) {

            mComboBox.setModel( new DefaultComboBoxModel(Constants.LANG_ARRAY) );
            mComboBox.setEditable(false);
            mEditor = new DefaultCellEditor(mComboBox);
        }
        else if ( className.equals("case C") ) {

            // THIS is the case, when the Jcombobox become editable, so beside the pre-defined item "Constants.INFIINITY" any arbitrary input should be allowed!
            mComboBox.setModel ( new DefaultComboBoxModel(new String[]{Constants.INFINITY}) ) ;
            mComboBox.setEditable(true);
            mEditor = new DefaultCellEditor(mComboBox);
        }
        else {
            mEditor = new DefaultCellEditor(new JTextField());
        }

        return mEditor.getTableCellEditorComponent(table, value, isSelected, row, column);
    }

    /**
    * Returns true if <code>anEvent</code> is <b>not</b> a
    * <code>MouseEvent</code>.  Otherwise, it returns true
    * if the necessary number of clicks have occurred, and
    * returns false otherwise.
    *
    * @param   anEvent         the event
    * @return  true  if cell is ready for editing, false otherwise
    * @see #setClickCountToStart
    * @see #shouldSelectCell
    */
    @Override
    public boolean isCellEditable(EventObject anEvent) {
        if (anEvent instanceof MouseEvent) {
            return ((MouseEvent)anEvent).getClickCount() >= clickCountToStart;
        }
        return true;
    }

    @Override
    public Object getCellEditorValue() {
        if (mEditor != null) {

            return mEditor.getCellEditorValue();
        }
        return null;
    }

}

有人知道原因是什么，在“案例C”的情况下，我没有得到最大的理由值，而是之前的表值？

谢谢

Answer 1

以下示例允许您在不创建自定义编辑器的情况下使用其他编辑器。它覆盖了JTable的getCellEditor(...)方法：

import java.awt.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

public class TableComboBoxByRow extends JPanel
{
    List<String[]> editorData = new ArrayList<String[]>(3);

    public TableComboBoxByRow()
    {
        setLayout( new BorderLayout() );

        // Create the editorData to be used for each row

        editorData.add( new String[]{ "Red", "Blue", "Green" } );
        editorData.add( new String[]{ "Circle", "Square", "Triangle" } );
        editorData.add( new String[]{ "Apple", "Orange", "Banana" } );

        //  Create the table with default data

        Object[][] data =
        {
            {"Color", "Red"},
            {"Shape", "Square"},
            {"Fruit", "Banana"},
            {"Plain", "Text"}
        };
        String[] columnNames = {"Type","Value"};

        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        JTable table = new JTable(model)
        {
            //  Determine editor to be used by row
            public TableCellEditor getCellEditor(int row, int column)
            {
                int modelColumn = convertColumnIndexToModel( column );

                if (modelColumn == 1 && row < 3)
                {
                    JComboBox<String> comboBox1 = new JComboBox<String>( editorData.get(row));
                    return new DefaultCellEditor( comboBox1 );
                }
                else
                    return super.getCellEditor(row, column);
            }
        };

        JScrollPane scrollPane = new JScrollPane( table );
        add( scrollPane );

    }

    private static void createAndShowUI()
    {
        JFrame frame = new JFrame("Table Combo Box by Row");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new TableComboBoxByRow() );
        frame.setSize(200, 200);
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

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

您的逻辑会有所不同，因为您将编辑器基于单元格中的数据类，但基本概念可以是相同的。

Answer 2

你试过这个吗？

table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);

Java Swing：自定义单元格编辑器不返回最新值

2 个答案: