附加属性的使用-调用虚拟键盘

在之前介绍过附加属性，但是附加属性该怎么样使用呢？这篇文章对上篇文章介绍的虚拟键盘进行一个封装。使它可以用在任意一个支持输入的控件上。

下面直接上代码（我们可以将这个附加属性，新放到一个文件中，

using System;using System.Collections.Generic;using System.Diagnostics;using System.Linq;using System.Runtime.InteropServices;using System.Text;using System.Threading.Tasks;using System.Windows;namespace VirtualKeyboard{    public class GetVirtualKeyboardHelper    {        protected GetVirtualKeyboardHelper()        {            ////do nothing        }        public static bool GetVirtualKeyboard(DependencyObject obj)        {            return (bool)obj.GetValue(VirtualKeyboardProperty);        }        public static void SetVirtualKeyboard(DependencyObject obj, bool value)        {            obj.SetValue(VirtualKeyboardProperty, value);        }        // Using a DependencyProperty as the backing store for VirtualKeyboard.  This enables animation, styling, binding, etc...        public static readonly DependencyProperty VirtualKeyboardProperty =            DependencyProperty.RegisterAttached("VirtualKeyboard", typeof(bool), typeof(GetVirtualKeyboardHelper), new PropertyMetadata(false, OnPropertyChanged));        private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)        {            var element = d as UIElement;            if (element != null)            {                //触摸时触发                element.TouchDown += ElementTouchDown;                element.LostFocus += ElementLostFocus;            }        }        private static void ElementTouchDown(object sender, RoutedEventArgs e)        {            try            {                StringBuilder sb = new StringBuilder();                string path = "\\Program Files\\Common Files\\microsoft shared\\ink\\TabTip.exe";                var file = Environment.GetEnvironmentVariable("SystemRoot");                var s = file.Split('\\');                for (int i = 0; i < s.Length - 1; i++)                {                    sb.Append(s[i]);                }                sb.Append(path);                if (!System.IO.File.Exists(sb.ToString()))                    return;                Process.Start(sb.ToString());            }            catch (Exception)            {                //nothing            }        }        private const Int32 WM_SYSCOMMAND = 274;        private const UInt32 SC_CLOSE = 61536;        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]        private static extern bool PostMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);        private static void ElementLostFocus(object sender, RoutedEventArgs e)        {            IntPtr touchhWnd = IntPtr.Zero;            touchhWnd = FindWindow("IPTip_Main_Window", null);            if (touchhWnd == IntPtr.Zero)                return;            PostMessage(touchhWnd, WM_SYSCOMMAND, SC_CLOSE, 0);        }    }}

那么这个附加属性该怎么使用呢？还是直接上代码

 <TextBox Margin="5,5,5,5" Name="textBox" local:GetVirtualKeyboardHelper.VirtualKeyboard="True" ></TextBox>

此时当我们点击这个textBox就会调用处虚拟键盘

本文标题:附加属性的使用-调用虚拟键盘
文章作者:huangruifeng
发布时间:2017年11月29日 - 17:11
最后更新:2017年11月29日 - 17:11
原始链接
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