source: branches/2893_BNLR/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/InlineObjectRun.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.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.TextFormatting;

namespace ICSharpCode.AvalonEdit.Rendering
{
  /// <summary>
  /// A inline UIElement in the document.
  /// </summary>
  public class InlineObjectElement : VisualLineElement
  {
    /// <summary>
    /// Gets the inline element that is displayed.
    /// </summary>
    public UIElement Element { get; private set; }
    
    /// <summary>
    /// Creates a new InlineObjectElement.
    /// </summary>
    /// <param name="documentLength">The length of the element in the document. Must be non-negative.</param>
    /// <param name="element">The element to display.</param>
    public InlineObjectElement(int documentLength, UIElement element)
      : base(1, documentLength)
    {
      if (element == null)
        throw new ArgumentNullException("element");
      this.Element = element;
    }
    
    /// <inheritdoc/>
    public override TextRun CreateTextRun(int startVisualColumn, ITextRunConstructionContext context)
    {
      if (context == null)
        throw new ArgumentNullException("context");
      
      return new InlineObjectRun(1, this.TextRunProperties, this.Element);
    }
  }
  
  /// <summary>
  /// A text run with an embedded UIElement.
  /// </summary>
  public class InlineObjectRun : TextEmbeddedObject
  {
    UIElement element;
    int length;
    TextRunProperties properties;
    internal Size desiredSize;
    
    /// <summary>
    /// Creates a new InlineObjectRun instance.
    /// </summary>
    /// <param name="length">The length of the TextRun.</param>
    /// <param name="properties">The <see cref="TextRunProperties"/> to use.</param>
    /// <param name="element">The <see cref="UIElement"/> to display.</param>
    public InlineObjectRun(int length, TextRunProperties properties, UIElement element)
    {
      if (length <= 0)
        throw new ArgumentOutOfRangeException("length", length, "Value must be positive");
      if (properties == null)
        throw new ArgumentNullException("properties");
      if (element == null)
        throw new ArgumentNullException("element");
      
      this.length = length;
      this.properties = properties;
      this.element = element;
    }
    
    /// <summary>
    /// Gets the element displayed by the InlineObjectRun.
    /// </summary>
    public UIElement Element {
      get { return element; }
    }
    
    /// <summary>
    /// Gets the VisualLine that contains this object. This property is only available after the object
    /// was added to the text view.
    /// </summary>
    public VisualLine VisualLine { get; internal set; }
    
    /// <inheritdoc/>
    public override LineBreakCondition BreakBefore {
      get { return LineBreakCondition.BreakDesired; }
    }
    
    /// <inheritdoc/>
    public override LineBreakCondition BreakAfter {
      get { return LineBreakCondition.BreakDesired; }
    }
    
    /// <inheritdoc/>
    public override bool HasFixedSize {
      get { return true; }
    }
    
    /// <inheritdoc/>
    public override CharacterBufferReference CharacterBufferReference {
      get { return new CharacterBufferReference(); }
    }
    
    /// <inheritdoc/>
    public override int Length {
      get { return length; }
    }
    
    /// <inheritdoc/>
    public override TextRunProperties Properties {
      get { return properties; }
    }
    
    /// <inheritdoc/>
    public override TextEmbeddedObjectMetrics Format(double remainingParagraphWidth)
    {
      double baseline = TextBlock.GetBaselineOffset(element);
      if (double.IsNaN(baseline))
        baseline = desiredSize.Height;
      return new TextEmbeddedObjectMetrics(desiredSize.Width, desiredSize.Height, baseline);
    }
    
    /// <inheritdoc/>
    public override Rect ComputeBoundingBox(bool rightToLeft, bool sideways)
    {
      if (this.element.IsArrangeValid) {
        double baseline = TextBlock.GetBaselineOffset(element);
        if (double.IsNaN(baseline))
          baseline = desiredSize.Height;
        return new Rect(new Point(0, -baseline), desiredSize);
      } else {
        return Rect.Empty;
      }
    }
    
    /// <inheritdoc/>
    public override void Draw(DrawingContext drawingContext, Point origin, bool rightToLeft, bool sideways)
    {
    }
  }
}