using System;

namespace Xamarin.Forms.Platform.Tizen
{
	/// <summary>
	/// Renderer of a Layout.
	/// </summary>
	public class LayoutRenderer : ViewRenderer<Layout, Native.Canvas>
	{
		/// <summary>
		/// Default constructor.
		/// </summary>
		public LayoutRenderer()
		{
		}

		protected override void UpdateLayout()
		{
			// in case of layouts we need to make sure that the minimum size of the native control is updated
			// this is important in case of ScrollView, when it's content is likely to be wider/higher than the window
			// EFL does not allow control to be larger than the window if it's minimum size is smaller than window dimensions
			ScrollView scrollView = Element.Parent as ScrollView;
			if (scrollView != null)
			{
				Size size = scrollView.ContentSize;
				Control.MinimumWidth = ToNativeDimension(Math.Max(size.Width, scrollView.Content.Width));
				Control.MinimumHeight = ToNativeDimension(Math.Max(size.Height, scrollView.Content.Height));
			}

			base.UpdateLayout();
		}

		protected override void OnElementChanged(ElementChangedEventArgs<Layout> e)
		{
			if (null == Control)
			{
				var canvas = new Native.Canvas(Forms.Context.MainWindow);
				canvas.LayoutUpdated += OnLayoutUpdated;
				SetNativeControl(canvas);
			}

			base.OnElementChanged(e);
		}

		protected override void Dispose(bool disposing)
		{
			Control.LayoutUpdated -= OnLayoutUpdated;

			base.Dispose(disposing);
		}

		void OnLayoutUpdated(object sender, Native.LayoutEventArgs e)
		{
			DoLayout(e);
		}
	}
}