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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Tango.Scripting.Editors.Document;
namespace Tango.Scripting.Editors.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
}
}
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