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

查看:14
本文介绍了TableModelListener 和多列验证的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

这是我第一次在这里发帖,如有错误请见谅.

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

我正在处理一个 JTable,其中的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

前 2 列也会自动"填充,将 0 放在其余列中.

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

如果数据正确,在第 5 列中我会显示一个勾号的图像,否则我会显示一个警告的图像.

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);
        }
    }

这段代码的问题是返回一个Stack Overflow,不知道怎么处理.

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包含多个单元格的表格上实现一些验证器?

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

提前致谢.

推荐答案

这段代码的问题在于返回堆栈溢出,而我没有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.

问题在于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.您的代码应该类似于:

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 根据另一列中的数据动态设置列的值的问题.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 java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

public class TableProcessing extends JPanel implements TableModelListener
{
    public TableProcessing()
    {
        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)
        {
            //  Returning the Class of each column will allow different
            //  renderers to be used based on Class
            @Override
            public Class getColumnClass(int column)
            {
                return getValueAt(0, column).getClass();
            }

            //  The Cost is not editable
            @Override
            public boolean isCellEditable(int row, int column)
            {
                return (column == 3) ? false : true;
            }
        };
        model.addTableModelListener( this );

        JTable table = new JTable( model );
        table.setPreferredScrollableViewportSize(table.getPreferredSize());

        JScrollPane scrollPane = new JScrollPane( table );
        add( scrollPane );

        String[] items = { "Bread", "Milk", "Tea", "Coffee" };
        JComboBox<String> editor = new JComboBox<String>( 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 = (TableModel)e.getSource();
                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);
            }
        }
    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("Table Model Listener");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new TableProcessing());
        frame.pack();
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args) throws Exception
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
*/
    }
}

这篇关于TableModelListener 和多列验证的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆