PIbd-32_Turner_I.A._COP_10/COP/VisualCompLib/MyEmailTextBox.cs

using System;
using ToolTip = System.Windows.Forms.ToolTip;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using System.Drawing;

namespace VisualCompLib
{
	public partial class MyEmailTextBox : UserControl
	{
		//Шаблон для textbox
		private string pattern;
		//Пример ввода
		private string example = "ti@gmail.com";
		public MyEmailTextBox()
		{
			InitializeComponent();
		}
		public string Pattern
		{
			get { return pattern; }
			set { pattern = value; }
		}
		public string TextBoxValue
		{
			get
			{
				Regex rg = new Regex(Pattern);
				bool address = rg.IsMatch(emailTextBox.Text);
				if (address)
				{
					return emailTextBox.Text;
				}
				else
				{
					Error = "Некорректный ввод";
					return null;
				}
			}
			set
			{
				Regex rg = new Regex(Pattern);
				bool address = rg.IsMatch(value);
				if (address)
				{
					emailTextBox.Text = value;
				}
				else
				{
					Error = "Некорректный ввод";
				}
			}
		}
		public string Error
		{
			get; private set;
		}
		public void setExample(string str)
		{
			Regex rg = new Regex(Pattern);
			bool address = rg.IsMatch(str);
			if (address)
			{
				example = str;
			}

		}
		private void textBox_Enter(object sender, EventArgs e)
		{
			int VisibleTime = 2000;  //ms
			ToolTip tooltip = new ToolTip();
			tooltip.Show(example, emailTextBox, 30, -20, VisibleTime);
		}

		private EventHandler onValueChanged;
		public event EventHandler ValueChanged
		{
			add
			{
				onValueChanged += value;
			}
			remove
			{
				onValueChanged -= value;
			}
		}

		private void textBox_TextChanged(object sender, EventArgs e)
		{
			onValueChanged?.Invoke(sender, e);
		}
	}
}