根據條件設置JTable單元禁用或啓用？

Question

我有一個JTable。它有四列;最後一列是複選框列。我想根據條件啓用或禁用複選框。

考慮到最後一列值（複選框值）爲true，則不允許用戶取消選中該複選框。如果值爲false，則允許用戶選擇複選框。

有什麼辦法嗎？我試過表iscellEditable(),setRowSelectionAllowed()。但是，這些方法並不符合我的理念。

Answer 1

基於此example，下面的代碼基於該行的模型狀態來規定isCellEditable()實現。一旦選中，一行就不能被取消選中。您可以根據需要使用合適的renderer更改這些行的外觀，如here所示。

import java.awt.BorderLayout; 
import java.awt.Dimension; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 
import javax.swing.ListSelectionModel; 
import javax.swing.table.DefaultTableModel; 

/** 
* @see https://stackoverflow.com/a/31082475/230513 
* @see https://stackoverflow.com/questions/7920068 
* @see https://stackoverflow.com/questions/4526779 
*/ 
public class CheckOnce extends JPanel { 

    private static final int CHECK_COL = 1; 
    private static final Object[][] DATA = { 
     {"One", Boolean.FALSE}, {"Two", Boolean.FALSE}, 
     {"Three", Boolean.FALSE}, {"Four", Boolean.FALSE}, 
     {"Five", Boolean.FALSE}, {"Six", Boolean.FALSE}, 
     {"Seven", Boolean.FALSE}, {"Eight", Boolean.FALSE}, 
     {"Nine", Boolean.FALSE}, {"Ten", Boolean.FALSE}}; 
    private static final String[] COLUMNS = {"Number", "CheckBox"}; 
    private DataModel dataModel = new DataModel(DATA, COLUMNS); 
    private JTable table = new JTable(dataModel); 

    public CheckOnce() { 
     super(new BorderLayout()); 
     this.add(new JScrollPane(table)); 
     table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); 
     table.setPreferredScrollableViewportSize(
      new Dimension(250, 10 * table.getRowHeight())); 
    } 

    private class DataModel extends DefaultTableModel { 

     public DataModel(Object[][] data, Object[] columnNames) { 
      super(data, columnNames); 
     } 

     @Override 
     public void setValueAt(Object aValue, int row, int col) { 
      super.setValueAt(aValue, row, col); 
     } 

     @Override 
     public Class<?> getColumnClass(int col) { 
      if (col == CHECK_COL) { 
       return getValueAt(0, CHECK_COL).getClass(); 
      } 
      return super.getColumnClass(col); 
     } 

     @Override 
     public boolean isCellEditable(int row, int col) { 
      Object o = getValueAt(row, col); 
      boolean b = o instanceof Boolean && (Boolean) o; 
      return col == CHECK_COL && !b; 
     } 
    } 

    private static void createAndShowUI() { 
     JFrame frame = new JFrame("CheckOne"); 
     frame.add(new CheckOnce()); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     java.awt.EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       createAndShowUI(); 
      } 
     }); 
    } 
}