Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Text / TextLineResult.cs / 1 / TextLineResult.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Access to calculated information of a line of text created // by TextBlock. // // History: // 04/25/2003 : [....] - Moving from Avalon branch. // 06/25/2004 : [....] - Performance work. // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Media; using MS.Internal.Documents; namespace MS.Internal.Text { ////// Provides access to calculated information of a line of text created /// by TextBlock. /// internal sealed class TextLineResult : LineResult { //------------------------------------------------------------------- // // LineResult Methods // //------------------------------------------------------------------- #region LineResult Methods ////// Retrieves a position matching distance within the line. /// /// Distance within the line. ////// A text position and its orientation matching or closest to the distance. /// internal override ITextPointer GetTextPositionFromDistance(double distance) { return _owner.GetTextPositionFromDistance(_dcp, distance, _layoutBox.Top, _index); } ////// /// /// ///internal override bool IsAtCaretUnitBoundary(ITextPointer position) { Debug.Assert(false); return false; } /// /// /// /// /// ///internal override ITextPointer GetNextCaretUnitPosition(ITextPointer position, LogicalDirection direction) { Debug.Assert(false); return null; } /// /// /// /// ///internal override ITextPointer GetBackspaceCaretUnitPosition(ITextPointer position) { Debug.Assert(false); return null; } /// /// /// /// /// ///internal override ReadOnlyCollection GetGlyphRuns(ITextPointer start, ITextPointer end) { Debug.Assert(false); return null; } /// /// Retrieves the position after last content character of the line, /// not including any line breaks. /// ////// The position after last content character of the line, /// not including any line breaks. /// internal override ITextPointer GetContentEndPosition() { EnsureComplexData(); return _owner.TextContainer.CreatePointerAtOffset(_dcp + _cchContent, LogicalDirection.Backward); } ////// Retrieves the position in the line pointing to the beginning of content /// hidden by ellipses. /// ////// The position in the line pointing to the beginning of content /// hidden by ellipses. /// internal override ITextPointer GetEllipsesPosition() { EnsureComplexData(); if (_cchEllipses != 0) { return _owner.TextContainer.CreatePointerAtOffset(_dcp + _cch - _cchEllipses, LogicalDirection.Forward); } return null; } ////// Retrieves the position after last content character of the line, /// not including any line breaks. /// ////// The position after last content character of the line, /// not including any line breaks. /// internal override int GetContentEndPositionCP() { EnsureComplexData(); return _dcp + _cchContent; } ////// Retrieves the position in the line pointing to the beginning of content /// hidden by ellipses. /// ////// The position in the line pointing to the beginning of content /// hidden by ellipses. /// internal override int GetEllipsesPositionCP() { EnsureComplexData(); return _dcp + _cch - _cchEllipses; } #endregion LineResult Methods //-------------------------------------------------------------------- // // LineResult Properties // //------------------------------------------------------------------- #region LineResult Properties ////// ITextPointer representing the beginning of the Line's contents. /// internal override ITextPointer StartPosition { get { if (_startPosition == null) { _startPosition = _owner.TextContainer.CreatePointerAtOffset(_dcp, LogicalDirection.Forward); } return _startPosition; } } ////// ITextPointer representing the end of the Line's contents. /// internal override ITextPointer EndPosition { get { if (_endPosition == null) { _endPosition = _owner.TextContainer.CreatePointerAtOffset(_dcp + _cch, LogicalDirection.Backward); } return _endPosition; } } ////// Character position representing the beginning of the Line's contents. /// internal override int StartPositionCP { get { return _dcp; } } ////// Character position representing the end of the Line's contents. /// internal override int EndPositionCP { get { return _dcp + _cch; } } ////// The bounding rectangle of the line. /// internal override Rect LayoutBox { get { return _layoutBox; } } ////// The dominant baseline of the line. /// Distance from the top of the line to the baseline. /// internal override double Baseline { get { return _baseline; } } #endregion LineResult Properties //-------------------------------------------------------------------- // // Constructors // //-------------------------------------------------------------------- #region Constructors ////// Constructor. /// /// Owner of the line. /// Index of the first character in the line. /// Number of all characters in the line. /// Rectangle of the line within a text paragraph. /// Distance from the top of the line to the baseline. /// Index of the line within the text block internal TextLineResult(System.Windows.Controls.TextBlock owner, int dcp, int cch, Rect layoutBox, double baseline, int index) { _owner = owner; _dcp = dcp; _cch = cch; _layoutBox = layoutBox; _baseline = baseline; _index = index; _cchContent = _cchEllipses = -1; } #endregion Constructors //------------------------------------------------------------------- // // Private Methods // //-------------------------------------------------------------------- #region Private Methods private void EnsureComplexData() { if (_cchContent == -1) { _owner.GetLineDetails(_dcp, _index, _layoutBox.Top, out _cchContent, out _cchEllipses); } } #endregion Private Methods //------------------------------------------------------------------- // // Private Fields // //------------------------------------------------------------------- #region Private Fields ////// Owner of the line. /// private readonly System.Windows.Controls.TextBlock _owner; ////// Index of the first character in the line. /// private readonly int _dcp; ////// Number of all characters in the line. /// private readonly int _cch; ////// Rectangle of the line within a text paragraph. /// private readonly Rect _layoutBox; ////// Index of the line within the TextBlock /// private int _index; ////// The dominant baseline of the line. Distance from the top of the /// line to the baseline. /// private readonly double _baseline; ////// ITextPointer representing the beginning of the Line's contents. /// private ITextPointer _startPosition; ////// ITextPointer representing the end of the Line's contents. /// private ITextPointer _endPosition; ////// Number of characters of content of the line, not including any line breaks. /// private int _cchContent; ////// Number of characters hidden by ellipses. /// private int _cchEllipses; #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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