Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TextTreeObjectNode.cs / 1305600 / TextTreeObjectNode.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: A TextContainer node representing a UIElement. // // History: // 02/18/2004 : [....] - Created // //--------------------------------------------------------------------------- using System; using MS.Internal; namespace System.Windows.Documents { // UIElements in the TextContainer are represented internally by TextTreeObjectNodes. // // This class is a simple container for a UIElement, it only holds state. internal class TextTreeObjectNode : TextTreeNode { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Creates a new TextTreeObjectNode instance. internal TextTreeObjectNode(DependencyObject embeddedElement) { _embeddedElement = embeddedElement; _symbolOffsetCache = -1; } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods #if DEBUG // Debug-only ToString override. public override string ToString() { return ("ObjectNode Id=" + this.DebugId + " Object=" + _embeddedElement); } #endif // DEBUG #endregion Public Methods //------------------------------------------------------ // // Internal Methods // //------------------------------------------------------ #region Internal Methods // Returns a shallow copy of this node. internal override TextTreeNode Clone() { TextTreeObjectNode clone; clone = new TextTreeObjectNode(_embeddedElement); return clone; } // Returns the TextPointerContext of the node. internal override TextPointerContext GetPointerContext(LogicalDirection direction) { return TextPointerContext.EmbeddedElement; } #endregion Internal methods //----------------------------------------------------- // // Internal Properties // //------------------------------------------------------ #region Internal Properties // If this node is a local root, then ParentNode contains it. // Otherwise, this is the node parenting this node within its tree. internal override SplayTreeNode ParentNode { get { return _parentNode; } set { _parentNode = (TextTreeNode)value; } } // TextTreeObjectNode never has contained nodes. internal override SplayTreeNode ContainedNode { get { return null; } set { Invariant.Assert(false, "Can't set contained node on a TextTreeObjectNode!"); } } // Count of symbols of all siblings preceding this node. internal override int LeftSymbolCount { get { return _leftSymbolCount; } set { _leftSymbolCount = value; } } // Count of symbols of all siblings preceding this node. internal override int LeftCharCount { get { return _leftCharCount; } set { _leftCharCount = value; } } // Left child node in a sibling tree. internal override SplayTreeNode LeftChildNode { get { return _leftChildNode; } set { _leftChildNode = (TextTreeNode)value; } } // Right child node in a sibling tree. internal override SplayTreeNode RightChildNode { get { return _rightChildNode; } set { _rightChildNode = (TextTreeNode)value; } } // The TextContainer's generation when SymbolOffsetCache was last updated. // If the current generation doesn't match TextContainer.Generation, then // SymbolOffsetCache is invalid. internal override uint Generation { get { return _generation; } set { _generation = value; } } // Cached symbol offset. internal override int SymbolOffsetCache { get { return _symbolOffsetCache; } set { _symbolOffsetCache = value; } } // Count of symbols covered by this node. internal override int SymbolCount { get { return 1; } set { Invariant.Assert(false, "Can't set SymbolCount on TextTreeObjectNode!"); } } // Count of symbols covered by this node. internal override int IMECharCount { get { return 1; } set { Invariant.Assert(false, "Can't set CharCount on TextTreeObjectNode!"); } } // Count of TextPositions referencing the node's BeforeStart edge. // Since nodes don't usually have any references, we demand allocate // storage when needed. internal override bool BeforeStartReferenceCount { get { return (_edgeReferenceCounts & ElementEdge.BeforeStart) != 0; } set { Invariant.Assert(value); // Illegal to clear a set ref count. _edgeReferenceCounts |= ElementEdge.BeforeStart; } } // Count of TextPositions referencing the node's AfterStart edge. // Since object nodes don't have an AfterStart edge, this is always zero. internal override bool AfterStartReferenceCount { get { return false; } set { Invariant.Assert(false, "Object nodes don't have an AfterStart edge!"); } } // Count of TextPositions referencing the node's BeforeEnd edge. // Since object nodes don't have an BeforeEnd edge, this is always zero. internal override bool BeforeEndReferenceCount { get { return false; } set { Invariant.Assert(false, "Object nodes don't have a BeforeEnd edge!"); } } // Count of TextPositions referencing the node's right // edge. // Since nodes don't usually have any references, we demand allocate // storage when needed. internal override bool AfterEndReferenceCount { get { return (_edgeReferenceCounts & ElementEdge.AfterEnd) != 0; } set { Invariant.Assert(value); // Illegal to clear a set ref count. _edgeReferenceCounts |= ElementEdge.AfterEnd; } } // The UIElement or ContentElement linked to this node. internal DependencyObject EmbeddedElement { get { return _embeddedElement; } } #endregion Internal Properties //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields // Count of symbols of all siblings preceding this node. private int _leftSymbolCount; // Count of chars of all siblings preceding this node. private int _leftCharCount; // If this node is a local root, then ParentNode contains it. // Otherwise, this is the node parenting this node within its tree. private TextTreeNode _parentNode; // Left child node in a sibling tree. private TextTreeNode _leftChildNode; // Right child node in a sibling tree. private TextTreeNode _rightChildNode; // The TextContainer's generation when SymbolOffsetCache was last updated. // If the current generation doesn't match TextContainer.Generation, then // SymbolOffsetCache is invalid. private uint _generation; // Cached symbol offset. private int _symbolOffsetCache; // Reference counts of TextPositions referencing this node. // Lazy allocated -- null means no references. private ElementEdge _edgeReferenceCounts; // The UIElement or ContentElement linked to this node. private readonly DependencyObject _embeddedElement; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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