Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / StaticTextPointer.cs / 1305600 / StaticTextPointer.cs
//---------------------------------------------------------------------------- // // File: StaticTextPointer.cs // // Copyright (C) Microsoft Corporation. All rights reserved. // // Description: Optimized minimal version of TextPointer that gets stored on the stack. // //--------------------------------------------------------------------------- namespace System.Windows.Documents { using System; using MS.Internal; using System.Threading; using System.Windows; using System.Collections; internal struct StaticTextPointer { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors internal StaticTextPointer(ITextContainer textContainer, object handle0) : this(textContainer, handle0, 0) { } internal StaticTextPointer(ITextContainer textContainer, object handle0, int handle1) { _textContainer = textContainer; _generation = (textContainer != null) ? textContainer.Generation : 0; _handle0 = handle0; _handle1 = handle1; } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods internal ITextPointer CreateDynamicTextPointer(LogicalDirection direction) { AssertGeneration(); return _textContainer.CreateDynamicTextPointer(this, direction); } internal TextPointerContext GetPointerContext(LogicalDirection direction) { AssertGeneration(); return _textContainer.GetPointerContext(this, direction); } internal int GetOffsetToPosition(StaticTextPointer position) { AssertGeneration(); return _textContainer.GetOffsetToPosition(this, position); } internal int GetTextInRun(LogicalDirection direction, char[] textBuffer, int startIndex, int count) { AssertGeneration(); return _textContainer.GetTextInRun(this, direction, textBuffer, startIndex, count); } internal object GetAdjacentElement(LogicalDirection direction) { AssertGeneration(); return _textContainer.GetAdjacentElement(this, direction); } internal StaticTextPointer CreatePointer(int offset) { AssertGeneration(); return _textContainer.CreatePointer(this, offset); } internal StaticTextPointer GetNextContextPosition(LogicalDirection direction) { AssertGeneration(); return _textContainer.GetNextContextPosition(this, direction); } internal int CompareTo(StaticTextPointer position) { AssertGeneration(); return _textContainer.CompareTo(this, position); } internal int CompareTo(ITextPointer position) { AssertGeneration(); return _textContainer.CompareTo(this, position); } internal object GetValue(DependencyProperty formattingProperty) { AssertGeneration(); return _textContainer.GetValue(this, formattingProperty); } internal static StaticTextPointer Min(StaticTextPointer position1, StaticTextPointer position2) { position2.AssertGeneration(); return position1.CompareTo(position2) <= 0 ? position1 : position2; } internal static StaticTextPointer Max(StaticTextPointer position1, StaticTextPointer position2) { position2.AssertGeneration(); return position1.CompareTo(position2) >= 0 ? position1 : position2; } // Asserts this StaticTextPointer is synchronized to the current tree generation. internal void AssertGeneration() { if (_textContainer != null) { Invariant.Assert(_generation == _textContainer.Generation, "StaticTextPointer not synchronized to tree generation!"); } } #endregion Internal Methods //------------------------------------------------------ // // Internal Properties // //------------------------------------------------------ #region Internal Properties internal ITextContainer TextContainer { get { return _textContainer; } } internal DependencyObject Parent { get { return _textContainer.GetParent(this); } } internal bool IsNull { get { return (_textContainer == null); } } internal object Handle0 { get { return _handle0; } } internal int Handle1 { get { return _handle1; } } #endregion Internal Properties //----------------------------------------------------- // // Internal Fields // //------------------------------------------------------ #region Internal Fields internal static StaticTextPointer Null = new StaticTextPointer(null, null, 0); #endregion Internal Fields //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields private readonly ITextContainer _textContainer; private readonly uint _generation; private readonly object _handle0; private readonly int _handle1; #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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