Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TextTreeFixupNode.cs / 1305600 / TextTreeFixupNode.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: A special TextContainer node used to parent deleted nodes. // // History: // 02/18/2004 : [....] - Created // //--------------------------------------------------------------------------- using System; using MS.Internal; namespace System.Windows.Documents { // TextTreeFixupNodes never actually appear in live trees. However, // whenever nodes are removed from the tree, we parent them to a fixup // node whose job it is to serve as a guide for any orphaned TextPositions // that might later need to find their way back to the original tree. internal class TextTreeFixupNode : TextTreeNode { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Creates a new TextTreeFixupNode instance. // previousNode/Edge should point to the node TextPositions will // move to after synchronizing against the deleted content. internal TextTreeFixupNode(TextTreeNode previousNode, ElementEdge previousEdge, TextTreeNode nextNode, ElementEdge nextEdge) : this(previousNode, previousEdge, nextNode, nextEdge, null, null) { } // Creates a new TextTreeFixupNode instance. // This ctor should only be called when extracting a single TextTreeTextElementNode. // previousNode/Edge should point to the node TextPositions will // move to after synchronizing against the deleted content. // first/lastContainedNode point to the first and last contained nodes // of an extracted element node. Positions may move into these nodes. internal TextTreeFixupNode(TextTreeNode previousNode, ElementEdge previousEdge, TextTreeNode nextNode, ElementEdge nextEdge, TextTreeNode firstContainedNode, TextTreeNode lastContainedNode) { _previousNode = previousNode; _previousEdge = previousEdge; _nextNode = nextNode; _nextEdge = nextEdge; _firstContainedNode = firstContainedNode; _lastContainedNode = lastContainedNode; } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods #if DEBUG // Debug-only ToString override. public override string ToString() { return ("FixupNode Id=" + this.DebugId); } #endif // DEBUG #endregion Public Methods //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ //----------------------------------------------------- // // Public Events // //------------------------------------------------------ //----------------------------------------------------- // // Protected Methods // //----------------------------------------------------- //----------------------------------------------------- // // Internal Methods // //------------------------------------------------------ #region Internal Methods // Returns a shallow copy of this node. internal override TextTreeNode Clone() { Invariant.Assert(false, "Unexpected call to TextTreeFixupNode.Clone!"); return null; } // Returns the TextPointerContext of the node. // Because fixup nodes are never in live trees, we should never get here. internal override TextPointerContext GetPointerContext(LogicalDirection direction) { Invariant.Assert(false, "Unexpected call to TextTreeFixupNode.GetPointerContext!"); return TextPointerContext.None; } #endregion Internal methods //----------------------------------------------------- // // Internal Properties // //------------------------------------------------------ #region Internal Properties // Fixup nodes never have parents. internal override SplayTreeNode ParentNode { get { return null; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes never contain nodes. internal override SplayTreeNode ContainedNode { get { return null; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes don't have symbol counts. internal override int LeftSymbolCount { get { return 0; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes don't have char counts. internal override int LeftCharCount { get { return 0; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes don't have siblings. internal override SplayTreeNode LeftChildNode { get { return null; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes don't have siblings. internal override SplayTreeNode RightChildNode { get { return null; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes don't have symbol counts. internal override uint Generation { get { return 0; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes don't have symbol counts. internal override int SymbolOffsetCache { get { return -1; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes don't have symbol counts. internal override int SymbolCount { get { return 0; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes don't have char counts. internal override int IMECharCount { get { return 0; } set { Invariant.Assert(false, "FixupNode"); } } // Fixup nodes are never referenced by TextPositions. internal override bool BeforeStartReferenceCount { get { return false; } set { Invariant.Assert(false, "TextTreeFixupNode should never have a position reference!"); } } // Fixup nodes are never referenced by TextPositions. internal override bool AfterStartReferenceCount { get { return false; } set { Invariant.Assert(false, "TextTreeFixupNode should never have a position reference!"); } } // Fixup nodes are never referenced by TextPositions. internal override bool BeforeEndReferenceCount { get { return false; } set { Invariant.Assert(false, "TextTreeFixupNode should never have a position reference!"); } } // Fixup nodes are never referenced by TextPositions. internal override bool AfterEndReferenceCount { get { return false; } set { Invariant.Assert(false, "TextTreeFixupNode should never have a position reference!"); } } // The node TextPositions with Backward gravity should move to // when leaving the deleted content. internal TextTreeNode PreviousNode { get { return _previousNode; } } // The edge TextPositions with Backward gravity should move to // when leaving the deleted content. internal ElementEdge PreviousEdge { get { return _previousEdge; } } // The node TextPositions with Forward gravity should move to // when leaving the deleted content. internal TextTreeNode NextNode { get { return _nextNode; } } // The edge TextPositions with Forward gravity should move to // when leaving the deleted content. internal ElementEdge NextEdge { get { return _nextEdge; } } // If this fixup is for a single TextElementNode extraction, this // field is the first contained node of the extracted element node. internal TextTreeNode FirstContainedNode { get { return _firstContainedNode; } } // If this fixup is for a single TextElementNode extraction, this // field is the last contained node of the extracted element node. internal TextTreeNode LastContainedNode { get { return _lastContainedNode; } } #endregion Internal Properties //------------------------------------------------------ // // Internal Events // //----------------------------------------------------- //------------------------------------------------------ // // Private Methods // //----------------------------------------------------- //----------------------------------------------------- // // Private Properties // //----------------------------------------------------- //------------------------------------------------------ // // Private Fields // //----------------------------------------------------- #region Private Fields // The node immediately preceding the deleted content parented by this fixup node. private readonly TextTreeNode _previousNode; // The edge immediately preceding the deleted content parented by this fixup node. private readonly ElementEdge _previousEdge; // The node immediately following the deleted content parented by this fixup node. private readonly TextTreeNode _nextNode; // The edge immediately following the deleted content parented by this fixup node. private readonly ElementEdge _nextEdge; // If this fixup is for a single TextElementNode extraction, this // field is the first contained node of the extracted element node. private readonly TextTreeNode _firstContainedNode; // If this fixup is for a single TextElementNode extraction, this // field is the last contained node of the extracted element node. private readonly TextTreeNode _lastContainedNode; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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