using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Xamarin.Forms.Controls
{
	public class RelativeLayoutGallery : ContentPage
	{
		public RelativeLayoutGallery()
		{
			var layout = new RelativeLayout ();

			var box1 = new ContentView {
				BackgroundColor = Color.Gray,
				Content = new Label {
					Text = "0"
				}
			};

			double padding = 10;
			layout.Children.Add (box1, () => new Rectangle (((layout.Width + padding) % 60) / 2, padding, 50, 50));

			var last = box1;
			for (int i = 0; i < 200; i++) {
				var relativeTo = last; // local copy
				var box = new ContentView {
					BackgroundColor = Color.Gray,
					Content = new Label {
						Text = (i+1).ToString ()
					}
				};

				Func<View, bool> pastBounds = view => relativeTo.Bounds.Right + padding + relativeTo.Width > layout.Width;
				layout.Children.Add (box, () => new Rectangle (pastBounds (relativeTo) ? box1.X : relativeTo.Bounds.Right + padding,
													  pastBounds (relativeTo) ? relativeTo.Bounds.Bottom + padding : relativeTo.Y, 
													  relativeTo.Width, 
													  relativeTo.Height));

				last = box;
			}

			Content = new ScrollView {Content = layout, Padding = new Thickness(50)};
		}
	}
}