source: trunk/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/TextLayer.cs

// 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.Collections.Generic;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;

namespace ICSharpCode.AvalonEdit.Rendering
{
  /// <summary>
  /// The control that contains the text.
  /// 
  /// This control is used to allow other UIElements to be placed inside the TextView but
  /// behind the text.
  /// The text rendering process (VisualLine creation) is controlled by the TextView, this
  /// class simply displays the created Visual Lines.
  /// </summary>
  /// <remarks>
  /// This class does not contain any input handling and is invisible to hit testing. Input
  /// is handled by the TextView.
  /// This allows UIElements that are displayed behind the text, but still can react to mouse input.
  /// </remarks>
  sealed class TextLayer : Layer
  {
    /// <summary>
    /// the index of the text layer in the layers collection
    /// </summary>
    internal int index;
    
    public TextLayer(TextView textView) : base(textView, KnownLayer.Text)
    {
    }
    
    List<VisualLineDrawingVisual> visuals = new List<VisualLineDrawingVisual>();
    
    internal void SetVisualLines(ICollection<VisualLine> visualLines)
    {
      foreach (VisualLineDrawingVisual v in visuals) {
        if (v.VisualLine.IsDisposed)
          RemoveVisualChild(v);
      }
      visuals.Clear();
      foreach (VisualLine newLine in visualLines) {
        VisualLineDrawingVisual v = newLine.Render();
        if (!v.IsAdded) {
          AddVisualChild(v);
          v.IsAdded = true;
        }
        visuals.Add(v);
      }
      InvalidateArrange();
    }
    
    protected override int VisualChildrenCount {
      get { return visuals.Count; }
    }
    
    protected override Visual GetVisualChild(int index)
    {
      return visuals[index];
    }
    
    protected override void ArrangeCore(Rect finalRect)
    {
      textView.ArrangeTextLayer(visuals);
    }
  }
}