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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Windows;
using System.Windows.Media;
using Microsoft.VisualStudio.Text.Classification;
using Microsoft.VisualStudio.Text.Editor;
using Microsoft.VisualStudio.Text.Tagging;
namespace Microsoft.CodeAnalysis.Editor.Implementation.Adornments
{
/// <summary>
/// Base type for tags that want to draw something with a simple configurable color. What is drawn will actually be
/// the responsibility of the particular <see cref="AbstractAdornmentManager{T}"/> subclass. Tags that want to draw
/// just a simple single <see cref="UIElement"/> should subclass <see cref="GraphicsTag"/>. In that case the <see
/// cref="AbstractAdornmentManager{T}"/> will just defer to the tag itself to create the element rather than
/// computing it itself.
/// </summary>
internal abstract class BrushTag : ITag
{
private static readonly Color s_lightGray = Color.FromRgb(0xA5, 0xA5, 0xA5);
private readonly IEditorFormatMap _editorFormatMap;
private Brush? _brush;
protected BrushTag(IEditorFormatMap editorFormatMap)
=> _editorFormatMap = editorFormatMap;
public Brush GetBrush(IWpfTextView view)
// If we can't get the color for some reason, fall back to a hard-coded value the editor has for outlining.
=> _brush ??= new SolidColorBrush(this.GetColor(view, _editorFormatMap) ?? s_lightGray);
protected abstract Color? GetColor(IWpfTextView view, IEditorFormatMap editorFormatMap);
}
}
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