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