Merge branch 'master' of https://twinetfs.visualstudio.com/Tango/_git/Tango

1 files changed, 91 insertions, 0 deletions

diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/LayerPosition.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/LayerPosition.cs
new file mode 100644
index 000000000..f64923eea
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+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/LayerPosition.cs
@@ -0,0 +1,91 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Windows;
+
+namespace Tango.Scripting.Editors.Rendering
+{
+	/// <summary>
+	/// An enumeration of well-known layers.
+	/// </summary>
+	public enum KnownLayer
+	{
+		/// <summary>
+		/// This layer is in the background.
+		/// There is no UIElement to represent this layer, it is directly drawn in the TextView.
+		/// It is not possible to replace the background layer or insert new layers below it.
+		/// </summary>
+		/// <remarks>This layer is below the Selection layer.</remarks>
+		Background,
+		/// <summary>
+		/// This layer contains the selection rectangle.
+		/// </summary>
+		/// <remarks>This layer is between the Background and the Text layers.</remarks>
+		Selection,
+		/// <summary>
+		/// This layer contains the text and inline UI elements.
+		/// </summary>
+		/// <remarks>This layer is between the Selection and the Caret layers.</remarks>
+		Text,
+		/// <summary>
+		/// This layer contains the blinking caret.
+		/// </summary>
+		/// <remarks>This layer is above the Text layer.</remarks>
+		Caret
+	}
+	
+	/// <summary>
+	/// Specifies where a new layer is inserted, in relation to an old layer.
+	/// </summary>
+	public enum LayerInsertionPosition
+	{
+		/// <summary>
+		/// The new layer is inserted below the specified layer.
+		/// </summary>
+		Below,
+		/// <summary>
+		/// The new layer replaces the specified layer. The old layer is removed
+		/// from the <see cref="TextView.Layers"/> collection.
+		/// </summary>
+		Replace,
+		/// <summary>
+		/// The new layer is inserted above the specified layer.
+		/// </summary>
+		Above
+	}
+	
+	sealed class LayerPosition : IComparable<LayerPosition>
+	{
+		internal static readonly DependencyProperty LayerPositionProperty =
+			DependencyProperty.RegisterAttached("LayerPosition", typeof(LayerPosition), typeof(LayerPosition));
+		
+		public static void SetLayerPosition(UIElement layer, LayerPosition value)
+		{
+			layer.SetValue(LayerPositionProperty, value);
+		}
+		
+		public static LayerPosition GetLayerPosition(UIElement layer)
+		{
+			return (LayerPosition)layer.GetValue(LayerPositionProperty);
+		}
+		
+		internal readonly KnownLayer KnownLayer;
+		internal readonly LayerInsertionPosition Position;
+		
+		public LayerPosition(KnownLayer knownLayer, LayerInsertionPosition position)
+		{
+			this.KnownLayer = knownLayer;
+			this.Position = position;
+		}
+		
+		public int CompareTo(LayerPosition other)
+		{
+			int r = this.KnownLayer.CompareTo(other.KnownLayer);
+			if (r != 0)
+				return r;
+			else
+				return this.Position.CompareTo(other.Position);
+		}
+	}
+}