MTP2.0_CSharp/Muchinfo.Common/Fx4.0/Muchinfo.WPF.Controls/NumberBox/DecimalNumBox.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mime;
using System.Text;
//----------------------------------------------------------------
//Module Name:  $safeprojectname$
//Purpose:      
//CopyRight:    Muchinfo
//History:
//----------------------------------------------------------------
//DateTime		2016/8/24 11:03:31
//Author       
//Description   Create
//----------------------------------------------------------------
using System.Windows;
using System.Windows.Input;
using Xceed.Wpf.Toolkit;

namespace Muchinfo.WPF.Controls
{
   public class DecimalNumBox : DecimalUpDown
   {


       private string _tempText;

       /// <summary>
       /// 小数位数
       /// </summary>
        public int DecimalCount
        {
            get { return (int)GetValue(DecimalCountProperty); }
            set { SetValue(DecimalCountProperty, value); }
        }

        // Using a DependencyProperty as the backing store for DecimalCount.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty DecimalCountProperty =
            DependencyProperty.Register("DecimalCount", typeof(int), typeof(DecimalNumBox), new PropertyMetadata(0));



        public int MaxTextLength
        {
            get { return (int)GetValue(MaxTextLengthProperty); }
            set { SetValue(MaxTextLengthProperty, value); }
        }

        // Using a DependencyProperty as the backing store for MaxTextLength.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty MaxTextLengthProperty =
            DependencyProperty.Register("MaxTextLength", typeof(int), typeof(DecimalNumBox), new PropertyMetadata(20));

        


        
           protected override void OnKeyDown(System.Windows.Input.KeyEventArgs e)
           {
               _tempText = Text;
             
               if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || (e.Key >= Key.D0 && e.Key <= Key.D9))
               {

                   if (!string.IsNullOrWhiteSpace(Text) && Text.Contains('.') && DecimalCount>0)
                   {
                       string[] strArr = TextBox.Text.Split('.');
                       if (strArr.Length >0&&TextBox.CaretIndex <= strArr[0].Length)
                       {
                           e.Handled = false;
                       }
                       else if (strArr.Length >= 1 && TextBox.CaretIndex > strArr[0].Length&&strArr[1].Length < DecimalCount)
                       {
                           e.Handled = false;
                       }
                       else
                       {
                           e.Handled = true;
                       }
                   }
                   else
                   {
                       e.Handled = false;
                   }
               }
               else if (((e.Key == Key.OemPeriod) || e.Key == Key.Decimal) && DecimalCount>0&& !string.IsNullOrWhiteSpace(Text) && !Text.Contains('.'))
               {
                   e.Handled = false;
               }
               else if (e.Key == Key.Tab)
               {
                   e.Handled = false;
               }
               else
               {
                   e.Handled = true;
               }
               if (!string.IsNullOrWhiteSpace(Text)&&MaxTextLength <= Text.Length)
               {
                   e.Handled = true;
                   
               }
           }

           protected override void OnKeyUp(KeyEventArgs e)
           {
               var index = TextBox.CaretIndex;
               //base.OnKeyUp(e); 
               if (string.IsNullOrWhiteSpace(Text))
               {
                   this.Value = 0;
                   return;
               }
               if (DecimalCount > 0)
               {
                   var pattern = "^[0-9]+(.[0-9]{0," + DecimalCount + "})?$";
                   if (!System.Text.RegularExpressions.Regex.IsMatch(Text, pattern))
                   {
                       Text = _tempText;
                        this.Value= this.ConvertTextToValue(Text);
                       TextBox.CaretIndex = index;
                   }
               }
           }       
       
    }
}