source: stable/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/HeightTreeNode.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.Diagnostics;

using ICSharpCode.AvalonEdit.Document;

namespace ICSharpCode.AvalonEdit.Rendering
{
  /// <summary>
  /// A node in the text view's height tree.
  /// </summary>
  sealed class HeightTreeNode
  {
    internal readonly DocumentLine documentLine;
    internal HeightTreeLineNode lineNode;
    
    internal HeightTreeNode left, right, parent;
    internal bool color;
    
    internal HeightTreeNode()
    {
    }
    
    internal HeightTreeNode(DocumentLine documentLine, double height)
    {
      this.documentLine = documentLine;
      this.totalCount = 1;
      this.lineNode = new HeightTreeLineNode(height);
      this.totalHeight = height;
    }
    
    internal HeightTreeNode LeftMost {
      get {
        HeightTreeNode node = this;
        while (node.left != null)
          node = node.left;
        return node;
      }
    }
    
    internal HeightTreeNode RightMost {
      get {
        HeightTreeNode node = this;
        while (node.right != null)
          node = node.right;
        return node;
      }
    }
    
    /// <summary>
    /// Gets the inorder successor of the node.
    /// </summary>
    internal HeightTreeNode Successor {
      get {
        if (right != null) {
          return right.LeftMost;
        } else {
          HeightTreeNode node = this;
          HeightTreeNode oldNode;
          do {
            oldNode = node;
            node = node.parent;
            // go up until we are coming out of a left subtree
          } while (node != null && node.right == oldNode);
          return node;
        }
      }
    }
    
    /// <summary>
    /// The number of lines in this node and its child nodes.
    /// Invariant:
    ///   totalCount = 1 + left.totalCount + right.totalCount
    /// </summary>
    internal int totalCount;
    
    /// <summary>
    /// The total height of this node and its child nodes, excluding directly collapsed nodes.
    /// Invariant:
    ///   totalHeight = left.IsDirectlyCollapsed ? 0 : left.totalHeight
    ///               + lineNode.IsDirectlyCollapsed ? 0 : lineNode.Height
    ///               + right.IsDirectlyCollapsed ? 0 : right.totalHeight
    /// </summary>
    internal double totalHeight;
    
    /// <summary>
    /// List of the sections that hold this node collapsed.
    /// Invariant 1:
    ///   For each document line in the range described by a CollapsedSection, exactly one ancestor
    ///   contains that CollapsedSection.
    /// Invariant 2:
    ///   A CollapsedSection is contained either in left+middle or middle+right or just middle.
    /// Invariant 3:
    ///   Start and end of a CollapsedSection always contain the collapsedSection in their
    ///   documentLine (middle node).
    /// </summary>
    internal List<CollapsedLineSection> collapsedSections;
    
    internal bool IsDirectlyCollapsed {
      get {
        return collapsedSections != null;
      }
    }
    
    internal void AddDirectlyCollapsed(CollapsedLineSection section)
    {
      if (collapsedSections == null) {
        collapsedSections = new List<CollapsedLineSection>();
        totalHeight = 0;
      }
      Debug.Assert(!collapsedSections.Contains(section));
      collapsedSections.Add(section);
    }
    
    
    internal void RemoveDirectlyCollapsed(CollapsedLineSection section)
    {
      Debug.Assert(collapsedSections.Contains(section));
      collapsedSections.Remove(section);
      if (collapsedSections.Count == 0) {
        collapsedSections = null;
        totalHeight = lineNode.TotalHeight;
        if (left != null)
          totalHeight += left.totalHeight;
        if (right != null)
          totalHeight += right.totalHeight;
      }
    }
    
    #if DEBUG
    public override string ToString()
    {
      return "[HeightTreeNode "
        + documentLine.LineNumber + " CS=" + GetCollapsedSections(collapsedSections)
        + " Line.CS=" + GetCollapsedSections(lineNode.collapsedSections)
        + " Line.Height=" + lineNode.height
        + " TotalHeight=" + totalHeight
        + "]";
    }
    
    static string GetCollapsedSections(List<CollapsedLineSection> list)
    {
      if (list == null)
        return "{}";
      return "{" +
        string.Join(",",
                    list.ConvertAll(cs=>cs.ID).ToArray())
        + "}";
    }
    #endif
  }
}