如何将不同的JComboBox放置在每行JTable中

Question

我想在我的应用程序中创建一个JTable。 该表将包含两个coumns，第一个是软件模块的名称。 第二列需要包含带有第一列软件模块版本号的JComboBox。

这是可能的，或者我需要找到另一种方式来做到这一点？ （例如：将一个按钮放到单元格中并从弹出窗口中选择修订版）

先谢谢您！

Answer 1

这里是一个可能的方案中使用DefaultComboBoxModel<Integer>作为表列的数据类型：

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

public class EditableComboCellEditorTest { 
    private JComponent makeUI() { 
    String[] columnNames = {"version", "revision"}; 
    Object[][] data = { 
     {"1.7.0", makeModel(76, 79, 80)}, 
     {"1.8.0", makeModel(91, 92, 101, 102)}, 
    }; 
    TableModel model = new DefaultTableModel(data, columnNames) { 
     @Override public Class<?> getColumnClass(int column) { 
     return column == 1 ? DefaultComboBoxModel.class : String.class; 
     } 
    }; 
    JTable table = new JTable(model); 
    table.setRowHeight(32); 
    table.setAutoCreateRowSorter(true); 

    TableColumn col = table.getColumnModel().getColumn(1); 
    col.setCellRenderer(new ComboCellRenderer()); 
    col.setCellEditor(new ComboCellEditor()); 

    return new JScrollPane(table); 
    } 
    private static DefaultComboBoxModel<Integer> makeModel(Integer... items) { 
    return new DefaultComboBoxModel<Integer>(items) { 
     @Override public String toString() { 
     return Objects.toString(getSelectedItem(), ""); 
     } 
    }; 
    } 
    public static void main(String... args) { 
    EventQueue.invokeLater(() -> { 
     JFrame f = new JFrame(); 
     f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     f.getContentPane().add(new EditableComboCellEditorTest().makeUI()); 
     f.setSize(320, 240); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    }); 
    } 
} 

class ComboCellRenderer implements TableCellRenderer { 
    private final JPanel p = new JPanel(new GridBagLayout()); 
    private final JComboBox<Integer> cb = new JComboBox<>(); 
    @Override public Component getTableCellRendererComponent(
    JTable table, Object value, boolean isSelected, boolean hasFocus, 
    int row, int column) { 
    p.removeAll(); 
    p.setOpaque(false); 
    p.add(cb); 
    cb.setEditable(true); 
    cb.removeAllItems(); 
    if (value instanceof DefaultComboBoxModel) { 
     DefaultComboBoxModel m = (DefaultComboBoxModel) value; 
     Object o = m.getSelectedItem(); 
     if (o instanceof Integer) { 
     cb.addItem((Integer) o); 
     } 
    } 
    return p; 
    } 
} 
//https://java-swing-tips.blogspot.jp/2016/08/use-editable-jcombobox-as.html 
class ComboCellEditor extends AbstractCellEditor implements TableCellEditor { 
    private final JPanel p = new JPanel(new GridBagLayout()); 
    private final JComboBox<Integer> cb = new JComboBox<>(); 
    protected ComboCellEditor() { 
    super(); 
    cb.setEditable(true); 
    cb.addActionListener(e -> fireEditingStopped()); 
    p.add(cb); 
    p.setOpaque(false); 
    } 
    @Override public Component getTableCellEditorComponent(
    JTable table, Object value, boolean isSelected, int row, int column) { 
    if (value instanceof ComboBoxModel) { 
     @SuppressWarnings("unchecked") 
     ComboBoxModel<Integer> m = (ComboBoxModel<Integer>) value; 
     cb.setModel(m); 
    } 
    return p; 
    } 
    @Override public Object getCellEditorValue() { 
    @SuppressWarnings("unchecked") 
    DefaultComboBoxModel<Integer> m = (DefaultComboBoxModel<Integer>) cb.getModel(); 
    if (cb.isEditable()) { 
     Object o = cb.getEditor().getItem(); 
     if (o instanceof Integer && m.getIndexOf((Integer) o) < 0) { 
     Integer value = (Integer) o; 
     int n = m.getSize(); 
     Vector<Integer> list = new Vector<>(n + 1); 
     for (int i = 0; i < n; i++) { 
      list.add(m.getElementAt(i)); 
     } 
     list.add(value); 
     Collections.sort(list); 
     m = new DefaultComboBoxModel<Integer>(list); 
     cb.setModel(m); 
     cb.setSelectedIndex(m.getIndexOf(value)); 
     } 
    } 
    return m; 
    } 
} 

Answer 2

覆盖的getCellEditor(...)方法返回组合框：

import java.awt.*; 
import java.util.List; 
import java.util.ArrayList; 
import javax.swing.*; 
import javax.swing.event.*; 
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); 
//  table.getColumnModel().getColumn(1).setCellRenderer(new ComboBoxRenderer2()); 
    } 
/* 
    class ComboBoxRenderer2 extends DefaultTableCellRenderer 
    { 
     @Override 
     public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) 
     { 
      JLabel label = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); 
      label.setIcon(UIManager.getIcon("Table.descendingSortIcon")); 
      return label; 
     } 
    } 
*/ 
    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(); 
      } 
     }); 
    } 
}