source: branches/2870_AutoDiff-nuget/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Highlighting/HighlightingBrush.cs @ 15653

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Diagnostics;
using System.Globalization;
using System.Reflection;
using System.Runtime.Serialization;
using System.Windows;
using System.Windows.Media;

using ICSharpCode.AvalonEdit.Rendering;

namespace ICSharpCode.AvalonEdit.Highlighting
{
  /// <summary>
  /// A brush used for syntax highlighting. Can retrieve a real brush on-demand.
  /// </summary>
  [Serializable]
  public abstract class HighlightingBrush
  {
    /// <summary>
    /// Gets the real brush.
    /// </summary>
    /// <param name="context">The construction context. context can be null!</param>
    public abstract Brush GetBrush(ITextRunConstructionContext context);
    
    /// <summary>
    /// Gets the color of the brush.
    /// </summary>
    /// <param name="context">The construction context. context can be null!</param>
    public virtual Color? GetColor(ITextRunConstructionContext context)
    {
      SolidColorBrush scb = GetBrush(context) as SolidColorBrush;
      if (scb != null)
        return scb.Color;
      else
        return null;
    }
  }
  
  /// <summary>
  /// Highlighting brush implementation that takes a frozen brush.
  /// </summary>
  [Serializable]
  public sealed class SimpleHighlightingBrush : HighlightingBrush, ISerializable
  {
    readonly SolidColorBrush brush;
    
    internal SimpleHighlightingBrush(SolidColorBrush brush)
    {
      brush.Freeze();
      this.brush = brush;
    }
    
    /// <inheritdoc/>
    public SimpleHighlightingBrush(Color color) : this(new SolidColorBrush(color)) {}
    
    /// <inheritdoc/>
    public override Brush GetBrush(ITextRunConstructionContext context)
    {
      return brush;
    }

    /// <inheritdoc/>
    public override string ToString()
    {
      return brush.ToString();
    }
    
    SimpleHighlightingBrush(SerializationInfo info, StreamingContext context)
    {
      this.brush = new SolidColorBrush((Color)ColorConverter.ConvertFromString(info.GetString("color")));
      brush.Freeze();
    }
    
    void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
    {
      info.AddValue("color", brush.Color.ToString(CultureInfo.InvariantCulture));
    }
    
    /// <inheritdoc/>
    public override bool Equals(object obj)
    {
      SimpleHighlightingBrush other = obj as SimpleHighlightingBrush;
      if (other == null)
        return false;
      return this.brush.Color.Equals(other.brush.Color);
    }
    
    /// <inheritdoc/>
    public override int GetHashCode()
    {
      return brush.Color.GetHashCode();
    }
  }
  
  /// <summary>
  /// HighlightingBrush implementation that finds a brush using a resource.
  /// </summary>
  [Serializable]
  sealed class SystemColorHighlightingBrush : HighlightingBrush, ISerializable
  {
    readonly PropertyInfo property;
    
    public SystemColorHighlightingBrush(PropertyInfo property)
    {
      Debug.Assert(property.ReflectedType == typeof(SystemColors));
      Debug.Assert(typeof(Brush).IsAssignableFrom(property.PropertyType));
      this.property = property;
    }
    
    public override Brush GetBrush(ITextRunConstructionContext context)
    {
      return (Brush)property.GetValue(null, null);
    }
    
    public override string ToString()
    {
      return property.Name;
    }
    
    SystemColorHighlightingBrush(SerializationInfo info, StreamingContext context)
    {
      property = typeof(SystemColors).GetProperty(info.GetString("propertyName"));
      if (property == null)
        throw new ArgumentException("Error deserializing SystemColorHighlightingBrush");
    }
    
    void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
    {
      info.AddValue("propertyName", property.Name);
    }
    
    public override bool Equals(object obj)
    {
      SystemColorHighlightingBrush other = obj as SystemColorHighlightingBrush;
      if (other == null)
        return false;
      return object.Equals(this.property, other.property);
    }
    
    public override int GetHashCode()
    {
      return property.GetHashCode();
    }
  }
}