using System;

using System.Windows;

using System.Windows.Controls;



namespace WpfHint.UIBuilding

{

	internal class ParamPanel : Panel

	{

		public static bool GetNameColumn(DependencyObject obj)

		{

			return (bool)obj.GetValue(NameColumnProperty);

		}



		public static void SetNameColumn(DependencyObject obj, bool value)

		{

			obj.SetValue(NameColumnProperty, value);

		}



		public static readonly DependencyProperty NameColumnProperty =

			DependencyProperty.RegisterAttached(

				"NameColumn", typeof(bool), typeof(ParamPanel),

				new FrameworkPropertyMetadata(false));





		public static readonly DependencyProperty WrapProperty =

			HintDecorator.WrapProperty.AddOwner(

				typeof(ParamPanel),

				new FrameworkPropertyMetadata((d, e) => ((UIElement)d).InvalidateMeasure()));



		#region Layout



		private const double tabSpace = 20;

		private double nameColumnWidth;



		protected override Size MeasureOverride(Size availableSize)

		{

			var panelSize = new Size();



			if (!HintDecorator.GetWrap(this))

			{

				foreach (UIElement child in base.InternalChildren)

				{

					child.Measure(availableSize);

					var desiredSize = child.DesiredSize;



					panelSize.Width += desiredSize.Width;

					panelSize.Height = Math.Max(panelSize.Height, desiredSize.Height);

				}

			}

			else

			{

				nameColumnWidth = 0.0;

				var typeColumnWidth = 0.0;

				var rowHeight = 0.0;



				foreach (UIElement child in base.InternalChildren)

				{

					child.Measure(availableSize);

					var ds = child.DesiredSize;



					if (GetNameColumn(child))

					{

						panelSize.Height += rowHeight;



						// tab sapce

						ds.Width += tabSpace;



						if (ds.Width > nameColumnWidth) nameColumnWidth = ds.Width;

						rowHeight = ds.Height;

					}

					else

					{

						if (ds.Width > typeColumnWidth) typeColumnWidth = ds.Width;

						rowHeight = Math.Max(rowHeight, ds.Height);

					}

				}



				panelSize.Height += rowHeight;

				panelSize.Width = nameColumnWidth + typeColumnWidth;

			}

			return panelSize;

		}



		protected override Size ArrangeOverride(Size finalSize)

		{

			if (!HintDecorator.GetWrap(this))

			{

				var pt = new Point();

				foreach (UIElement child in base.InternalChildren)

				{

					var size = child.DesiredSize;

					child.Arrange(new Rect(pt, size));

					pt.X += size.Width;

				}

			}

			else

			{

				var ht = 0.0;

				var y = 0.0;



				foreach (UIElement child in base.InternalChildren)

				{

					var size = child.DesiredSize;



					if (GetNameColumn(child))

					{

						child.Arrange(new Rect(tabSpace, y, nameColumnWidth - tabSpace, size.Height));

						ht = size.Height;

					}

					else

					{

						child.Arrange(new Rect(nameColumnWidth, y, size.Width, size.Height));

						y += Math.Max(ht, size.Height);

					}

				}

			}

			return finalSize;

		}



		#endregion

	}

}