java - ComboBox 未在 JTable 中显示其内容

Question

我想在 JTable 中显示一个组合框。对于 JTable，我使用 TableModel。我已成功显示组合框(不是其 toString())。问题是我无法查看其内容。组合框必须不可编辑。我读过很多教程，但没有找到 TableModel 的教程。我找到了这段代码:

 JComboBox comboBox = new JComboBox();
    comboBox.addItem("Snowboarding");
    comboBox.addItem("Rowing");
    comboBox.addItem("Knitting");
    comboBox.addItem("Speed reading");
    comboBox.addItem("Pool");
    comboBox.addItem("None of the above");
    sportColumn.setCellEditor(new DefaultCellEditor(comboBox));

    //Set up tool tips for the sport cells.
    DefaultTableCellRenderer renderer =
            new DefaultTableCellRenderer();
    renderer.setToolTipText("Click for combo box");
    sportColumn.setCellRenderer(renderer);
}

我无法使用它有两个原因。我的 Combobox 的内容不一样，并且它们不使用 TableModel。这是我的代码:

公共(public)类 TProfModel 扩展 DefaultTableModel 实现 TableModel {

/**
 * 
 */
private static final long serialVersionUID = 1L;
private String[] names = { "Nom", "Prénom", "Matière", "Classes" };
private Model model;

public TProfModel(Model model){
    this.model = model;
    fireTableDataChanged();
}


public Class<?> getColumnClass(int col) {
    return getValueAt(0,col).getClass();
}

public int getColumnCount() {
    return names.length;
}

public String getColumnName(int col) {
    return names[col];
}

public int getRowCount() {
    if(model != null)
        return model.getProfs().size();
    return 0;
}

public Object getValueAt(int line, int col) {

    switch (col) {
    case 0:
        return model.getProfs().get(line).getNom();
    case 1:
        return model.getProfs().get(line).getPrenom();
    case 2:
        return model.getProfs().get(line).getMatiere();
    case 3:
        return getClasses(line);
    }
    return null;
}

private JComboBox<String> getClasses(int line) {
    JComboBox<String> comboBox = new JComboBox<String>();
    for(String classe : model.getProfs().get(line).getClasses())
        comboBox.addItem(classe);
    comboBox.setSelectedIndex(0);
    return comboBox;
}


public boolean isCellEditable(int arg0, int arg1) {
    if(arg1 == 3)
        return false;
    return true;
}

public void removeTableModelListener(TableModelListener arg0) {
    // TODO Auto-generated method stub

}

@Override
public void setValueAt(Object object, int line, int col) {
    switch (col) {
    case 0:
        model.getProfs().get(line).setNom((String) object);
        break;
    case 1:
        model.getProfs().get(line).setPrenom((String) object);
        break;
    case 2:
        model.getProfs().get(line).setMatiere((String) object);
    }
    model.writeData();
}

}

Answer 1

您可以重写 getCellEditor(...) 方法以返回不同的编辑器。像这样的东西:

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 JPanel
{
    List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3);

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

        // Create the editors to be used for each row

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

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

        String[] items3 = { "Apple", "Orange", "Banana" };
        JComboBox<String> comboBox3 = new JComboBox<String>( 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 );
        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();
            }
        });
    }
}