HexInput

基本思路

PreviewTextInput

OnTextChange

OnLostFocus

PreviewKeyDown

<UserControl x:Class="MeterGui_BlendView.HexInput"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d">
    <TextBox x:Name="TB" PreviewTextInput="TB_PreviewTextInput" TextChanged="TB_TextChanged" PreviewKeyDown="TB_PreviewKeyDown" LostFocus="TB_LostFocus" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
</UserControl>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace MeterGui_BlendView
{
    /// <summary>
    /// HexInput.xaml 的交互逻辑
    /// </summary>
    public partial class HexInput : UserControl
    {
        public HexInput()
        {
            InitializeComponent();
            Binding binding = new Binding();
            binding.Source = this;
            binding.Path = new PropertyPath("HexText");
            binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            binding.Mode = BindingMode.TwoWay;
            TB.SetBinding(TextBox.TextProperty, binding);
        }
        #region DependencyProperty        
        public static readonly DependencyProperty HexTextProperty = DependencyProperty.Register(
        "HexText",//制定属性的名称
        typeof(string), //制定属性的类型
        typeof(HexInput),//
        new FrameworkPropertyMetadata(""));//设定默认值
        public string HexText
        {
            get { return (string)GetValue(HexTextProperty); }
            set { SetValue(HexTextProperty, value); }
        }

        public static readonly DependencyProperty AutoNumberProperty = DependencyProperty.Register(
        "AutoNumber", typeof(long), typeof(HexInput),new FrameworkPropertyMetadata((long)2));
        public long AutoNumber
        {
            get { return (long)GetValue(AutoNumberProperty); }
            set { SetValue(AutoNumberProperty, value); }
        } 
        #endregion

        //private void TB_PreviewTextInput(object sender, TextCompositionEventArgs e)
        //{
        //    if(!("0123456789ABCDEF".Contains(e.Text.ToUpper())))
        //        e.Handled=true;
        //}

        //private void TB_TextChanged(object sender, TextChangedEventArgs e)
        //{
        //    if (!(sender as TextBox).IsFocused)
        //    {
        //        string s = (sender as TextBox).Text;
        //        FormatHex(ref s);
        //        (sender as TextBox).Text = s;
        //    }
        //}

        private void TB_LostFocus(object sender, RoutedEventArgs e)
        {
            string s = TB.Text;
            FormatHex(ref s);
            TB.Text = s;
        }

        private void TB_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (false
                || e.Key == Key.Space
                )
                e.Handled = true;
        }

        private void TB_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            int p = (sender as TextBox).SelectionStart;
            int pl = (sender as TextBox).SelectionLength;
            string s = (sender as TextBox).Text;
            if ("0123456789ABCDEF".Contains(e.Text.ToUpper()))
            {
                //s=s.Remove(p+1,pl-1)
                if (p == s.Length)
                {
                    s = p == 0 ? s + e.Text + "0" : s + " " + e.Text + "0";
                    p = p == 0 ? p : p + 1;
                }
                else
                {
                    //如果空格结尾会有索引越界情况
                    if (s.Substring((sender as TextBox).SelectionStart, 1) == " ")
                    {
                        p = p + 1;
                    }
                    s = s.Remove(p, 1);
                    s = s.Insert(p, e.Text);
                }
            }
            (sender as TextBox).Text = s;
            (sender as TextBox).SelectionStart = p + 1;
            e.Handled = true;
        }

        private void TB_TextChanged(object sender, TextChangedEventArgs e)
        {
            int p = (sender as TextBox).SelectionStart;
            string s = (sender as TextBox).Text;
            FormatHex(ref s);
            (sender as TextBox).Text = s;
            (sender as TextBox).SelectionStart = p;
            //HexText = TB.Text.Replace(" ", "");
        }

        private void FormatHex(ref string s,bool b=true)
        {
            s = s.Replace(" ", "");
            //s = ((s.Length % AutoNumber) == 0) ? s : (s + "0");
            if (s.Length >= 128)
                s = s.Substring(0, 128);
            if(b)
            {
                for (int i = ((int)AutoNumber - s.Length % (int)AutoNumber) % (int)AutoNumber; i > 0; i--) 
                {
                    s = s + "0";
                }
            }
            int l = s.Length;
            int n = (l-2) / 2;
            for (int i = n; i > 0; i--)
            {
                s = s.Insert(2 * i, " ");
            }
            s = s.ToUpper();
        }


    }
}

<vi:HexInput 
AutoNumber="8"  
HexText="{Binding Model.P_option, Mode=TwoWay, 
Converter={StaticResource String2HexStringConverter2}}" />