驗證單元格后，JTable單元格編輯不會更改

Question

我有一個自定義單元格編輯器，該編輯器可以驗證輸入的值是否為數字並且其長度為3。

現在，我可以確保如果輸入了無效值，則當前單元格保持可編輯狀態，並且焦點不會移至下一個單元格。

但是，當輸入有效值時，當前單元格仍然保持可編輯狀態，並且焦點僅移至下一個單元格。

另外，顯示警報的注釋部分也不起作用。 整個應用程序掛起，我相信提示會在后台出現。

下面是編輯器的代碼

public class DepartmentCellEditor extends DefaultCellEditor{


public DepartmentCellEditor()
{
    super( new JTextField() );
}

public boolean stopCellEditing()
{
    JTable table = (JTable)getComponent().getParent();

    try
    {           
         boolean isValid = true;
         String s = getCellEditorValue().toString();
         if ( s.length() == 3 ) {
             for ( int i = 0; i < s.length(); i++ ) {
                 if ( !Character.isDigit( s.charAt( i ) ) ) {
                     isValid = false;
                     break;
                 }
             }
         } else {
             isValid = false;
         }
         if ( !isValid ) {

           JTextField textField = (JTextField)getComponent();
           textField.setBorder(new LineBorder(Color.red));
           textField.selectAll();
           textField.requestFocusInWindow();
           /*JOptionPane.showMessageDialog(
          null,
         "Please enter a 3 digit number.",
           "Alert!",JOptionPane.ERROR_MESSAGE);*/
         } else {
             JTextField textField = (JTextField)getComponent();
             textField.setBorder(new LineBorder(Color.black));
         }
         return isValid;
    }
    catch(ClassCastException exception)
    {
        JTextField textField = (JTextField)getComponent();
        textField.setBorder(new LineBorder(Color.red));
        textField.selectAll();
        textField.requestFocusInWindow();
        return false;
    }
}

public Component getTableCellEditorComponent(
    JTable table, Object value, boolean isSelected, int row, int column)
{
    Component c = super.getTableCellEditorComponent(
        table, value, isSelected, row, column);
    ((JComponent)c).setBorder(new LineBorder(Color.black));

    return c;
}

}

Answer 1

從重寫的stopCellEditing()方法成功返回時，需要調用super.stopCellEditing() 。

請參見下面我使用單元格編輯器編寫的示例程序。 我添加了super.stopCellEditing() ，現在它可以工作了。

import javax.swing.*;
import javax.swing.border.LineBorder;
import java.awt.*;

public class DepartmentCellEditor extends DefaultCellEditor
{
  public DepartmentCellEditor()
  {
    super( new JTextField() );
  }

  public boolean stopCellEditing()
  {
    JTable table = (JTable)getComponent().getParent();

    try
    {
      boolean isValid = true;
      String s = getCellEditorValue().toString();
      if ( s.length() == 3 ) {
        for ( int i = 0; i < s.length(); i++ ) {
          if ( !Character.isDigit( s.charAt( i ) ) ) {
            isValid = false;
            break;
          }
        }
      } else {
        isValid = false;
      }
      if ( !isValid ) {

        JTextField textField = (JTextField)getComponent();
        textField.setBorder(new LineBorder(Color.red));
        textField.selectAll();
        textField.requestFocusInWindow();
           /*JOptionPane.showMessageDialog(
          null,
         "Please enter a 3 digit number.",
           "Alert!",JOptionPane.ERROR_MESSAGE);*/
      } else {
        JTextField textField = (JTextField)getComponent();
        textField.setBorder(new LineBorder(Color.black));
      }
      return isValid && super.stopCellEditing(); //THIS IS THE CHANGE
    }
    catch(ClassCastException exception)
    {
      JTextField textField = (JTextField)getComponent();
      textField.setBorder(new LineBorder(Color.red));
      textField.selectAll();
      textField.requestFocusInWindow();
      return false;
    }
  }

  public Component getTableCellEditorComponent(
      JTable table, Object value, boolean isSelected, int row, int column)
  {
    Component c = super.getTableCellEditorComponent(
        table, value, isSelected, row, column);
    ((JComponent)c).setBorder(new LineBorder(Color.black));

    return c;
  }

  public static void main(String[] args)
  {
    JTable table = new JTable(new String[][] {{"111", "222"}, {"", ""}}, new String[] {"A", "B"});
    table.getColumn("A").setCellEditor(new DepartmentCellEditor());
    table.getColumn("B").setCellEditor(new DepartmentCellEditor());

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(new JScrollPane(table));
    frame.pack();
    frame.setLocationByPlatform(true);
    frame.setVisible(true);
  }
}