JVEntryElement for MonoTouch.Dialog using gshackles JVFloatSharp

/*
Xamarin.iOS MonoTouch.Dialog JVFloatSharp Element for gshackles https://github.com/gshackles/JVFloatSharp/

This creates an EntryElement with placeholders that change into floating labels when the field is populated with text.

Andy Whittlestone
*/

	public class JVEntryElement : EntryElement 
	{
		public UIColor FloatingLabelTextColor { get; set; }
		public UIColor FloatingLabelActiveTextColor { get; set; }

		private string _placeHolder;

		private bool _isPassword;

		private JVFloatLabeledTextField _entry;

		private UITextAlignment _textAlignment;

		private UIFont _floatingLabelFont = UIFont.BoldSystemFontOfSize(12);

		public UIFont FloatingLabelFont {
			get { return _floatingLabelFont; }
			set { _floatingLabelFont = value; }
		}

		public new UITextAlignment TextAlignment {
			get {
				return _textAlignment;
			}
			set{
				_textAlignment = value;
				if (_entry != null)
					_entry.TextAlignment = _textAlignment;
			}
		}

		public JVEntryElement (string caption, string placeholder, string value) : base (caption, placeholder, value)
		{ 
			Value = value;
			_placeHolder = placeholder;
		}

		public JVEntryElement (string caption, string placeholder, string value, bool isPassword) : base (caption, placeholder, value, isPassword)
		{
			Value = value;
			_isPassword = isPassword;
			_placeHolder = placeholder;
		}

		protected override UITextField CreateTextField (RectangleF frame)
		{
			return _entry = new JVFloatLabeledTextField (frame) {
				AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleLeftMargin,
				Placeholder = _placeHolder ?? "",
				SecureTextEntry = _isPassword,
				Text = Value ?? "",
				Tag = 1,
				TextAlignment = _textAlignment,
				ClearButtonMode = ClearButtonMode,
				FloatingLabelTextColor = FloatingLabelTextColor,
				FloatingLabelActiveTextColor = FloatingLabelActiveTextColor,
				FloatingLabelFont = FloatingLabelFont,
			};
		}

		public override UITableViewCell GetCell (UITableView tv)
		{
			var cell = base.GetCell (tv);
			// lets make it fit better to the eye
			_entry.Frame = new RectangleF (_entry.Frame.Location.X, 0, _entry.Frame.Width, cell.Frame.Height-5);
			return cell;
		}
	}
}