TableModelListener和多列验证 [英] TableModelListener and multiple column validation

问题描述

这是我第一次在这里发帖，很抱歉，如果我犯了一些错误。

This is the first time for me to post here, so sorry if I made some mistake.

我正在研究一个JTable哪个列数据必须验证一些参数，例如：

I am working on a JTable which column data have to verify some parameters, for example:

第3列值> 30

第4列值> 10

第5列值> 4

Column 3 values > 30
Column 4 values > 10
Column 5 values > 4

此外，前2列是自动填充的，在其余列中加0。

Also the first 2 columns are filled "automatically", putting 0s in the rest of the columns.

如果这些数据是正确的，在第5列中我会显示一个勾号图像，否则，我会显示一个警告图像。

If that data is correct, in the Column 5 I would show an image of a tick, otherwise, I would show an image of a warning.

为了验证这一点，我使用了以下代码

For verifying this I use the following code

    ImageIcon accept = new javax.swing.ImageIcon(getClass().getResource("/resources/accept.png"));
    ImageIcon deny = new javax.swing.ImageIcon(getClass().getResource("/resources/exclamation.png"));

    public void tableChanged(TableModelEvent e) {
        int row = e.getFirstRow();
        double d1 = Double.valueOf(jTable.getValueAt(row, 2).toString());
        double d2 = Double.valueOf(jT.getValueAt(row, 3).toString());
        double d3 = Double.valueOf(jT.getValueAt(row, 4).toString());

        if(d1>MAX_A||d2>MAX_B||d3>MAX_C){
            jTable.setValueAt(deny, row, 5);
        }
        else{
            jTable.setValueAt(accept, row, 5);
        }
    }

此代码的问题是返回Stack Overflow ，我不知道如何处理这个。

The problem of this code is that returns a Stack Overflow, and I don't know how to handle this.

有没有其他方法可以在一个暗示多个单元格的表上实现一些验证器？

Is there any other way to implement some verifier on a table that implies multiple cells?

提前致谢。

推荐答案

此代码的问题是
返回Stack Overflow，我不知道如何处理这个问题。

The problem of this code is that returns a Stack Overflow, and I don't know how to handle this.

问题是您的代码在模型侦听器中设置了一个值，因此生成了另一个tableChanged事件。你的代码应该是这样的：

The problem is that your code sets a value in the model listener so another tableChanged event is generated. Your code should be something like:

if (e.getColumn() != 5)
   // do your code

我没有看到使用TableModelListener动态设置基于列的值的问题另一栏中的数据。这是一个简单的例子：

I don't see a problem using a TableModelListener to dynamically set the value of a column based on data in another column. Here is a simple example:

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

public class TableProcessing extends JFrame implements TableModelListener
{
    JTable table;

    public TableProcessing()
    {
        super("Table");
        String[] columnNames = {"Item", "Quantity", "Price", "Cost"};
        Object[][] data =
        {
            {"Bread", new Integer(1), new Double(1.11), new Double(1.11)},
            {"Milk", new Integer(1), new Double(2.22), new Double(2.22)},
            {"Tea", new Integer(1), new Double(3.33), new Double(3.33)},
            {"Cofee", new Integer(1), new Double(4.44), new Double(4.44)}
        };

        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        model.addTableModelListener( this );
//
        table = new JTable( model )
        {
            //  Returning the Class of each column will allow different
            //  renderers to be used based on Class
            public Class getColumnClass(int column)
            {
                return getValueAt(0, column).getClass();
            }

            //  The Cost is not editable
            public boolean isCellEditable(int row, int column)
            {
                int modelColumn = convertColumnIndexToModel( column );
                return (modelColumn == 3) ? false : true;
            }
        };
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
//
        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );


        String[] items = { "Bread", "Milk", "Tea", "Coffee" };
        JComboBox editor = new JComboBox( items );

        DefaultCellEditor dce = new DefaultCellEditor( editor );
        table.getColumnModel().getColumn(0).setCellEditor(dce);
    }

    /*
     *  The cost is recalculated whenever the quantity or price is changed
     */
    public void tableChanged(TableModelEvent e)
    {
        if (e.getType() == TableModelEvent.UPDATE)
        {
            int row = e.getFirstRow();
            int column = e.getColumn();

            if (column == 1 || column == 2)
            {
                TableModel model = table.getModel();
                int quantity = ((Integer)model.getValueAt(row, 1)).intValue();
                double price = ((Double)model.getValueAt(row, 2)).doubleValue();
                Double value = new Double(quantity * price);
                model.setValueAt(value, row, 3);
            }
        }
    }

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

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