Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TextTreeTextElementNode.cs / 1305600 / TextTreeTextElementNode.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: A TextContainer node representing a TextElement. // // History: // 02/18/2004 : [....] - Created // //--------------------------------------------------------------------------- using System; using MS.Internal; namespace System.Windows.Documents { // Each TextElement inserted though a public API is represented internally // by a TextTreeTextElementNode. // // TextTreeTextElementNodes may contain trees of child nodes, nodes in // a contained tree are scoped by the element node. internal class TextTreeTextElementNode : TextTreeNode { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Creates a new instance. internal TextTreeTextElementNode() { _symbolOffsetCache = -1; } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods #if DEBUG // Debug-only ToString override. public override string ToString() { return ("TextElementNode Id=" + this.DebugId + " SymbolCount=" + _symbolCount); } #endif // DEBUG #endregion Public Methods //------------------------------------------------------ // // Internal Methods // //------------------------------------------------------ #region Internal Methods // Returns a shallow copy of this node. internal override TextTreeNode Clone() { TextTreeTextElementNode clone; clone = new TextTreeTextElementNode(); clone._symbolCount = _symbolCount; clone._imeCharCount = _imeCharCount; clone._textElement = _textElement; return clone; } // Returns the TextPointerContext of the node. // Returns ElementStart if direction == Forward, otherwise ElementEnd // if direction == Backward. internal override TextPointerContext GetPointerContext(LogicalDirection direction) { return (direction == LogicalDirection.Forward) ? TextPointerContext.ElementStart : TextPointerContext.ElementEnd; } #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; } } // Root node of a contained tree, if any. internal override SplayTreeNode ContainedNode { get { return _containedNode; } set { _containedNode = (TextTreeNode)value; } } // Count of symbols of all siblings preceding this node. internal override int LeftSymbolCount { get { return _leftSymbolCount; } set { _leftSymbolCount = value; } } // Count of chars 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 and any contained nodes. // Includes two symbols for this node's start/end edges. internal override int SymbolCount { get { return _symbolCount; } set { _symbolCount = value; } } // Count of chars covered by this node and any contained nodes. internal override int IMECharCount { get { return _imeCharCount; } set { _imeCharCount = value; } } // 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 nodes don't usually have any references, we demand allocate // storage when needed. internal override bool AfterStartReferenceCount { get { return (_edgeReferenceCounts & ElementEdge.AfterStart) != 0; } set { Invariant.Assert(value); // Illegal to clear a set ref count. _edgeReferenceCounts |= ElementEdge.AfterStart; } } // Count of TextPositions referencing the node's BeforeEnd edge. // Since nodes don't usually have any references, we demand allocate // storage when needed. internal override bool BeforeEndReferenceCount { get { return (_edgeReferenceCounts & ElementEdge.BeforeEnd) != 0; } set { Invariant.Assert(value); // Illegal to clear a set ref count. _edgeReferenceCounts |= ElementEdge.BeforeEnd; } } // Count of TextPositions referencing the node's AfterEnd 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 TextElement associated with this node. internal TextElement TextElement { get { return _textElement; } set { _textElement = value; } } // Plain text character count of this element's start edge. // This property depends on the current location of the node! internal int IMELeftEdgeCharCount { get { return (_textElement == null) ? -1 : _textElement.IMELeftEdgeCharCount; } } // Returns true if this node is the leftmost sibling of its parent. internal bool IsFirstSibling { get { Splay(); return (_leftChildNode == null); } } #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; // Root node of a contained tree, if any. private TextTreeNode _containedNode; // 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; // Count of symbols covered by this node and any contained nodes. // Includes two symbols for this node's start/end edges. private int _symbolCount; // Count of chars covered by this node and any contained nodes. private int _imeCharCount; // The TextElement associated with this node. private TextElement _textElement; // Reference counts of TextPositions referencing this node. // Lazy allocated -- null means no references. private ElementEdge _edgeReferenceCounts; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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