gistfile1.cs

public class EntryElement : Element {
		/// <summary>
		///   The value of the EntryElement
		/// </summary>
		public string Value;
 
		/// <summary>
		/// The type of keyboard used for input, you can change
		/// this to use this for numeric input, email addressed,
		/// urls, phones.
		/// </summary>
		public UIKeyboardType KeyboardType = UIKeyboardType.Default;
 
		static NSString ekey = new NSString ("EntryElement");
		bool isPassword;
		UITextField entry;
		string placeholder;
		static UIFont font = UIFont.BoldSystemFontOfSize (17);
 
		public Func<bool,string> Validator;
 
		/// <summary>
		/// Constructs an EntryElement with the given caption, placeholder and initial value.
		/// </summary>
		/// <param name="caption">
		/// The caption to use
		/// </param>
		/// <param name="placeholder">
		/// Placeholder to display.
		/// </param>
		/// <param name="value">
		/// Initial value.
		/// </param>
		public EntryElement (string caption, string placeholder, string value) : base (caption)
		{
			Value = value;
			this.placeholder = placeholder;
		}
 
		/// <summary>
		/// Constructs  an EntryElement for password entry with the given caption, placeholder and initial value.
		/// </summary>
		/// <param name="caption">
		/// The caption to use
		/// </param>
		/// <param name="placeholder">
		/// Placeholder to display.
		/// </param>
		/// <param name="value">
		/// Initial value.
		/// </param>
		/// <param name="isPassword">
		/// True if this should be used to enter a password.
		/// </param>
		public EntryElement (string caption, string placeholder, string value, bool isPassword) : base (caption)
		{
			Value = value;
			this.isPassword = isPassword;
			this.placeholder = placeholder;
		}
 
		public override string Summary ()
		{
			return Value;
		}
 
		// 
		// Computes the X position for the entry by aligning all the entries in the Section
		//
		SizeF ComputeEntryPosition (UITableView tv, UITableViewCell cell)
		{
			Section s = Parent as Section;
			if (s.EntryAlignment.Width != 0)
				return s.EntryAlignment;
 
			SizeF max = new SizeF (-1, -1);
			foreach (var e in s.Elements){
				var ee = e as EntryElement;
				if (ee == null)
					continue;
 
				var size = tv.StringSize (ee.Caption, font);
				if (size.Width > max.Width)
					max = size;				
			}
			s.EntryAlignment = new SizeF (25 + Math.Min (max.Width, 160), max.Height);
			return s.EntryAlignment;
		}
 
		public override UITableViewCell GetCell (UITableView tv)
		{
			var cell = tv.DequeueReusableCell (ekey);
			if (cell == null){
				cell = new UITableViewCell (UITableViewCellStyle.Default, ekey);
				cell.SelectionStyle = UITableViewCellSelectionStyle.None;
			} else 
				RemoveTag (cell, 1);
 
			if (entry == null){
				SizeF size = ComputeEntryPosition (tv, cell);
				entry = new UITextField (new RectangleF (size.Width, (cell.ContentView.Bounds.Height-size.Height)/2-1, 320-size.Width, size.Height)){
					Tag = 1,
					Placeholder = placeholder ?? "",
					SecureTextEntry = isPassword
				};
				entry.Text = Value ?? "";
				entry.AutoresizingMask = UIViewAutoresizing.FlexibleWidth |
					UIViewAutoresizing.FlexibleLeftMargin;
 
				entry.ValueChanged += delegate {
					Value = entry.Text;
				};
				
				entry.Ended += delegate {
					Value = entry.Text;
				};
				
				entry.ShouldReturn += delegate {
					EntryElement focus = null;
					foreach (var e in (Parent as Section).Elements){
						if (e == this)
							focus = this;
						else if (focus != null && e is EntryElement)
							focus = e as EntryElement;
					}
					if (focus != this)
						focus.entry.BecomeFirstResponder ();
					else 
						focus.entry.ResignFirstResponder ();
 
					return true;
				};
				entry.Started += delegate {
					EntryElement self = null;
					var returnType = UIReturnKeyType.Default;
 
					foreach (var e in (Parent as Section).Elements){
						if (e == this)
							self = this;
						else if (self != null && e is EntryElement)
							returnType = UIReturnKeyType.Next;
					}
					entry.ReturnKeyType = returnType;
				};
			}
			entry.KeyboardType = KeyboardType;
 
			cell.TextLabel.Text = Caption;
			cell.ContentView.AddSubview (entry);
			return cell;
		}
 
		protected override void Dispose (bool disposing)
		{
			if (disposing){
				entry.Dispose ();
				entry = null;
			}
		}
	}