Edit text with suffix

SuffixEditText

using Android.Content;
using Android.Util;
using Android.Widget;
using Android.Runtime;
using System;
using Android.Text;

namespace Utils
{
    public class SuffixEditText : EditText
    {
        private string _suffix;
        private bool _addTextProgrammaticlly;

        public SuffixEditText(IntPtr a, JniHandleOwnership b)
            : base(a, b)
        {
            Initialize();
        }

        public SuffixEditText(Context context)
            : base(context)
        {
            Initialize();

        }

        public SuffixEditText(Context context, IAttributeSet attrs)
            : base(context, attrs)
        {
            Initialize();

        }

        public SuffixEditText(Context context, IAttributeSet attrs, int defStyle)
            : base(context, attrs, defStyle)
        {
            Initialize();
        }

        private void Initialize()
        {
            TextChanged += OnTextChanged;
        }

        private void AddSuffixIfCan()
        {
            if (!_addTextProgrammaticlly && !string.IsNullOrEmpty(_suffix))
            {
                if (!Text.EndsWith(_suffix))
                {
                    _addTextProgrammaticlly = true;
                    Text = $"{Text}{_suffix}";
                }
            }
            else {
                _addTextProgrammaticlly = false;
            }
        }
        private void OnTextChanged(object sender, TextChangedEventArgs e)
        {
            AddSuffixIfCan();
        }

        public void SetSuffix(string suffix)
        {
            _suffix = suffix;
            Text = _suffix;
        }

        protected override void OnSelectionChanged(int selStart, int selEnd)
        {
            base.OnSelectionChanged(selStart, selEnd);

            if (_suffix != null)
            {
                if (selStart > Length() - _suffix.Length)
                {
                    SetSelection(Length() - _suffix.Length, Length() - _suffix.Length);
                }
                else if (selEnd > Length() - _suffix.Length)
                {
                    SetSelection(selStart, Length() - _suffix.Length);
                }
            }
        }

        public string TextWithoutSuffix
        {
            get { return Text.Replace(_suffix, ""); }
        }

        public void Reset()
        {
            Text = _suffix;
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            if (disposing)
            {
                TextChanged -= OnTextChanged;
            }
        }
    }
}