Question

我不知道怎么做在特定行中设置一个jcombobox ...现在我已经为所有行设置了这个jcombobox，但是我只希望它在一行中：

JComboBox cc = new JComboBox();
cc.addItem(jComboBox5.getSelectedItem()+"/"+jComboBox6.getSelectedItem()+"/"+jComboBox7.getSelectedItem()+" "+jComboBox1.getSelectedItem()+"."+jComboBox2.getSelectedItem());
jTable1.getColumnModel().getColumn(3).setCellEditor(new DefaultCellEditor(cc));
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
    renderer.setToolTipText("CLICCA PER LE DATE");
jTable1.getColumnModel().getColumn(3).setCellRenderer(renderer);

Answer 1

但我只希望它在一行中：

重写getCellEditor（...）方法以返回给定行的特定编辑器：

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

public class TableComboBoxByRow extends JFrame
{
    List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3);

    public TableComboBoxByRow()
    {
        // Create the editors to be used for each row

        String[] items1 = { "Red", "Blue", "Green" };
        JComboBox comboBox1 = new JComboBox( items1 );
        DefaultCellEditor dce1 = new DefaultCellEditor( comboBox1 );
        editors.add( dce1 );

        String[] items2 = { "Circle", "Square", "Triangle" };
        JComboBox comboBox2 = new JComboBox( items2 );
        DefaultCellEditor dce2 = new DefaultCellEditor( comboBox2 );
        editors.add( dce2 );

        String[] items3 = { "Apple", "Orange", "Banana" };
        JComboBox comboBox3 = new JComboBox( items3 );
        DefaultCellEditor dce3 = new DefaultCellEditor( comboBox3 );
        editors.add( dce3 );

        //  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)
                    return editors.get(row);
                else
                    return super.getCellEditor(row, column);
            }
        };

        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );
    }

    public static void main(String[] args)
    {
        TableComboBoxByRow frame = new TableComboBoxByRow();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible(true);
    }
}

Answer 2

更新：当我测试我的（可能是不完整的）答案时，我遇到了一个非常好的SO问题，我认为它会比我能做得更好：Putting JComboBox into JTable

另一个更新：我再次阅读了您的问题，我意识到您要求特定行。我能想到这样做的唯一方法是创建一个自定义的CellEditor，类似于：

private static class MyCellEditor extends AbstractCellEditor implements TableCellEditor {

    DefaultCellEditor other = new DefaultCellEditor(new JTextField());
    DefaultCellEditor checkbox = new DefaultCellEditor(new JComboBox(new Object[] {"abc"}));

    private DefaultCellEditor lastSelected;

    @Override
    public Object getCellEditorValue() {

        return lastSelected.getCellEditorValue();
    }

    @Override
    public Component getTableCellEditorComponent(JTable table,
            Object value, boolean isSelected, int row, int column) {
        if(row == 0) {
            lastSelected = checkbox;
            return checkbox.getTableCellEditorComponent(table, value, isSelected, row, column);
        }
        lastSelected = other;
        return other.getTableCellEditorComponent(table, value, isSelected, row, column);
    }

}

在此示例中，自定义CellEditor实际上是两个编辑器，并且根据所选行，特定编辑器将获得调用（包括比喻和字面）。我承认lastSelected似乎有点笨拙，但我老实说找不到更简单的方法来知道返回哪个Editor值（因为getCellEditorValue没有args）。

为了让你的表显得“正确”，你可能还需要对渲染器做一些事情（因为渲染器可能知道也可能不知道将JComboBox的选定值显示为初始值）。这取决于您如何初始化实际表中的数据。

为了完整起见，我的原始答案如下：

您可以使用TableModel上的addRow将JComboBox组件添加到行，如下所示：How to add row in JTable?

另请参阅：http://docs.oracle.com/javase/tutorial/uiswing/components/table.html

我认为主要问题是你将列编辑器/渲染器的想法与将存储在每一行中的实际数据混合在一起。

Celleditor（JComboBox）在JTable的特定行中

2 个答案: