Full custom view

ITTextLayout_Full.cs

using Android.Content;
using Android.Util;
using Android.Support.Design.Widget;
using Android.Runtime;
using System;
using Android.Views;
using Android.Content.Res;
using Android.Text;
using Android.Views.InputMethods;

namespace InTouch.Controls
{
    [Register("intouch.controls.ITTextInputLayout")]
    public class ITTextInputLayout : TextInputLayout, IITComposite
    {
        private bool _subscribed;

        public EventHandler TextChanged;

        public ITTextInputLayout(Context context) : this(context, null)
        {
        }

        public ITTextInputLayout(Context context, IAttributeSet attrs) : base(context, attrs)
        {
            LayoutInflater inflator = (LayoutInflater)context.GetSystemService(Context.LayoutInflaterService);
            inflator.Inflate(Resource.Layout.control_textinput, this);

            Control = (TextInputEditText) EditText;
            TypedArray a = context.ObtainStyledAttributes(attrs, Resource.Styleable.ITTextInputLayout);
            try
            {
                InputType = (InputTypes)a.GetInt(Resource.Styleable.ITTextInputLayout_android_inputType, (int)InputTypes.ClassText);
                ImeOptions = (ImeAction)a.GetInt(Resource.Styleable.ITTextInputLayout_android_imeOptions, (int)ImeAction.None);
                MaxLines = a.GetInt(Resource.Styleable.ITTextInputLayout_android_maxLines, 1);
                Text = a.GetString(Resource.Styleable.ITTextInputLayout_android_text);
                Header = a.GetString(Resource.Styleable.ITTextInputLayout_ItcHeader);
                Error = a.GetString(Resource.Styleable.ITTextInputLayout_ItcError);
            }
            finally
            {
                a.Recycle();
            }
        }

        protected ITTextInputLayout(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
        {
        }

        #region Properties

        public string Text
        {
            get { return Control.Text; }
            set { Control.Text = value; }
        }

        public int MaxLines
        {
            get { return Control.MaxLines; }
            set { Control.SetMaxLines(value); }
        }

        public InputTypes InputType
        {
            get { return Control.InputType; }
            set { Control.InputType = value; }
        }

        public ImeAction ImeOptions
        {
            get { return Control.ImeOptions; }
            set { Control.ImeOptions = value; }
        }

        public string Header
        {
            get { return Hint; }
            set { Hint = value; }
        }

        public new string Error
        {
            get { return base.Error; }
            set
            {
                string error = value as string;
                if (error != null)
                {
                    ErrorEnabled = true;
                    base.Error = error;
                }
                else
                {
                    ErrorEnabled = false;
                    base.Error = null;
                }
            }
        }

        private TextInputEditText Control { get; set; }

        #endregion

        #region Methods

        protected override void OnAttachedToWindow()
        {
            base.OnAttachedToWindow();

            Control.AfterTextChanged += HandleAfterTextChanged;
            _subscribed = true;
        }

        protected override void OnDetachedFromWindow()
        {
            base.OnDetachedFromWindow();

            Control.AfterTextChanged -= HandleAfterTextChanged;
            _subscribed = false;
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (Control != null && _subscribed)
                {
                    Control.AfterTextChanged -= HandleAfterTextChanged;
                    _subscribed = false;
                }
            }

            base.Dispose(disposing);
        }

        #endregion

        #region Event Handlers

        private void HandleAfterTextChanged(object sender, EventArgs e)
        {
            TextChanged?.Invoke(this, e);
        }

        #endregion
    }
}