LoadMoreElement.cs

using System;
using System.Drawing;
using MonoTouch.CoreFoundation;
using MonoTouch.Foundation;
using MonoTouch.UIKit;

namespace FbGroups
{
	public class LoadMoreElement : MonoTouch.Dialog.Element
	{
		public string NormalCaption
		{
			get;set;
		}
		
		public string LoadingCaption
		{
			get;set;
		}
		
		NSAction tapped = null;
		
		UITableViewCell cell;
		UIActivityIndicatorView activityIndicator;
		UILabel caption;
		UITableView tableView;
		UIFont font;
		
		public LoadMoreElement (string normalCaption, string loadingCaption, NSAction tapped, UIFont font, UIColor textColor) : base("")
		{
			this.NormalCaption = normalCaption;
			this.LoadingCaption = loadingCaption;
			this.tapped = tapped;
			this.font = font;
			
			cell = new UITableViewCell(UITableViewCellStyle.Default, "loadMoreElement");
			
			activityIndicator = new UIActivityIndicatorView();
			activityIndicator.ActivityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray;
			activityIndicator.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
			
			caption = new UILabel();
			caption.Font = font;
			caption.Text = this.NormalCaption;
			caption.TextColor = textColor;
			caption.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
			
			cell.ContentView.AddSubview(caption);
			cell.ContentView.AddSubview(activityIndicator);
									
		}
		
		public override UITableViewCell GetCell (UITableView tv)
		{
			tableView = tv;
			Layout();
			return cell;
		}
				
		public override void Selected (MonoTouch.Dialog.DialogViewController dvc, UITableView tableView, NSIndexPath path)
		{
			tableView.DeselectRow(path, true);
			
			caption.Text = this.LoadingCaption;
			activityIndicator.Hidden = false;
			activityIndicator.StartAnimating();
			Layout();
			
			System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(Tapped));
		}
		
		void Tapped(object state)
		{
			if (tapped != null)
				tapped();
			
			FinishedLoading();
		}
		
		void Layout()
		{
			var size = tableView.StringSize(caption.Text, font, tableView.Frame.Width, UILineBreakMode.TailTruncation);
			
			float center = tableView.Frame.Width / 2;
			
			if (activityIndicator.IsAnimating)
			{
				activityIndicator.Frame = new RectangleF(center - (size.Width / 2) - 24, 10, 24, 24);
				caption.Frame = new RectangleF(activityIndicator.Frame.X + 35, 0, size.Width, 45);
			}
			else
			{
				caption.Frame = new RectangleF(center - (size.Width / 2), 0, size.Width, 45);
			}
		}
		
		void FinishedLoading()
		{
			this.cell.BeginInvokeOnMainThread(delegate {
				activityIndicator.StopAnimating();
				activityIndicator.Hidden = true;
				Layout();
			});
		}
	}
}