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// 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);
}
}
}
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