Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TextTreeRootTextBlock.cs / 1305600 / TextTreeRootTextBlock.cs
//---------------------------------------------------------------------------- // // File: TextTreeRootTextBlock.cs // // Description: The root node of a TextBlock splay tree. // //--------------------------------------------------------------------------- using System; using MS.Internal; using System.Collections; namespace System.Windows.Documents { // The root node of a TextBlock splay tree. internal class TextTreeRootTextBlock : SplayTreeNode { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Creates a TextTreeRootTextBlock instance. internal TextTreeRootTextBlock() { TextTreeTextBlock block; // Allocate an initial block with just two characters -- one for // each edge of the root node. The block will grow when/if // additional content is added. block = new TextTreeTextBlock(2); block.InsertAtNode(this, ElementEdge.AfterStart); } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods #if DEBUG // Debug-only ToString override. public override string ToString() { return ("RootTextBlock Id=" + this.DebugId); } #endif // DEBUG #endregion Public Methods //------------------------------------------------------ // // Internal Properties // //------------------------------------------------------ #region Internal Properties // The root node never has a parent node. internal override SplayTreeNode ParentNode { get { return null; } set { Invariant.Assert(false, "Can't set ParentNode on TextBlock root!"); } } // Root node of a contained tree, if any. internal override SplayTreeNode ContainedNode { get { return _containedNode; } set { _containedNode = (TextTreeTextBlock)value; } } // The root node never has sibling nodes, so the LeftSymbolCount is a // constant zero. internal override int LeftSymbolCount { get { return 0; } set { Invariant.Assert(false, "TextContainer root is never a sibling!"); } } // Count of unicode chars of all siblings preceding this node. // This property is only used by TextTreeNodes. internal override int LeftCharCount { get { return 0; } set { Invariant.Assert(value == 0); } } // The root node never has siblings, so it never has child nodes. internal override SplayTreeNode LeftChildNode { get { return null; } set { Invariant.Assert(false, "TextBlock root never has sibling nodes!"); } } // The root node never has siblings, so it never has child nodes. internal override SplayTreeNode RightChildNode { get { return null; } set { Invariant.Assert(false, "TextBlock root never has sibling nodes!"); } } // The tree generation. Not used for TextTreeRootTextBlock. internal override uint Generation { get { return 0; } set { Invariant.Assert(false, "TextTreeRootTextBlock does not track Generation!"); } } // Cached symbol offset. The root node is always at offset zero. internal override int SymbolOffsetCache { get { return 0; } set { Invariant.Assert(false, "TextTreeRootTextBlock does not track SymbolOffsetCache!"); } } // Not used for TextTreeRootTextBlock. internal override int SymbolCount { get { return -1; } set { Invariant.Assert(false, "TextTreeRootTextBlock does not track symbol count!"); } } // Count of unicode chars covered by this node and any contained nodes. // This property is only used by TextTreeNodes. internal override int IMECharCount { get { return 0; } set { Invariant.Assert(value == 0); } } #endregion Internal Properties //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Fields // Root node of a contained tree, if any. private TextTreeTextBlock _containedNode; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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