Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PtsHost / OptimalTextSource.cs / 1305600 / OptimalTextSource.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: ContainerParagraph.cs // // Description: Text line formatter. // // History: // 05/05/2003 : [....] - moving from Avalon branch. // //--------------------------------------------------------------------------- #pragma warning disable 1634, 1691 // avoid generating warnings about unknown // message numbers and unknown pragmas for PRESharp contol using System; using System.Diagnostics; using System.Collections; using System.Collections.Generic; using System.Globalization; using System.Security; // SecurityCritical using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Media; using System.Windows.Media.TextFormatting; using MS.Internal.Text; using MS.Internal.Documents; using MS.Internal.PtsHost.UnsafeNativeMethods; namespace MS.Internal.PtsHost { ////// Text line formatter. /// ////// NOTE: All DCPs used during line formatting are related to cpPara. /// To get abosolute CP, add cpPara to a dcp value. /// internal sealed class OptimalTextSource : LineBase { //------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors ////// Constructor. /// /// /// TextFormatter host /// /// /// Character position of paragraph /// /// /// Track width /// /// /// Owner of the line /// /// /// Text run cache /// internal OptimalTextSource(TextFormatterHost host, int cpPara, int durTrack, TextParaClient paraClient, TextRunCache runCache) : base(paraClient) { _host = host; _durTrack = durTrack; _runCache = runCache; _cpPara = cpPara; } ////// Free all resources associated with the line. Prepare it for reuse. /// public override void Dispose() { base.Dispose(); } #endregion Constructors // ------------------------------------------------------------------ // // TextSource Implementation // // ----------------------------------------------------------------- #region TextSource Implementation ////// Get a text run at specified text source position and return it. /// /// /// dcp of position relative to start of line /// internal override TextRun GetTextRun(int dcp) { TextRun run = null; ITextContainer textContainer = _paraClient.Paragraph.StructuralCache.TextContainer; StaticTextPointer position = textContainer.CreateStaticPointerAtOffset(_cpPara + dcp); switch (position.GetPointerContext(LogicalDirection.Forward)) { case TextPointerContext.Text: run = HandleText(position); break; case TextPointerContext.ElementStart: run = HandleElementStartEdge(position); break; case TextPointerContext.ElementEnd: run = HandleElementEndEdge(position); break; case TextPointerContext.EmbeddedElement: run = HandleEmbeddedObject(dcp, position); break; case TextPointerContext.None: run = new ParagraphBreakRun(_syntheticCharacterLength, PTS.FSFLRES.fsflrEndOfParagraph); break; } Invariant.Assert(run != null, "TextRun has not been created."); Invariant.Assert(run.Length > 0, "TextRun has to have positive length."); return run; } ////// Get text immediately before specified text source position. Return CharacterBufferRange /// containing this text. /// /// /// dcp of position relative to start of line /// internal override TextSpanGetPrecedingText(int dcp) { // Parameter validation Invariant.Assert(dcp >= 0); int nonTextLength = 0; CharacterBufferRange precedingText = CharacterBufferRange.Empty; CultureInfo culture = null; if (dcp > 0) { // Create TextPointer at dcp, and pointer at paragraph start to compare ITextPointer startPosition = TextContainerHelper.GetTextPointerFromCP(_paraClient.Paragraph.StructuralCache.TextContainer, _cpPara, LogicalDirection.Forward); ITextPointer position = TextContainerHelper.GetTextPointerFromCP(_paraClient.Paragraph.StructuralCache.TextContainer, _cpPara + dcp, LogicalDirection.Forward); // Move backward until we find a position at the end of a text run, or reach start of TextContainer while (position.GetPointerContext(LogicalDirection.Backward) != TextPointerContext.Text && position.CompareTo(startPosition) != 0) { position.MoveByOffset(-1); nonTextLength++; } // Return text in run. If it is at start of TextContainer this will return an empty string string precedingTextString = position.GetTextInRun(LogicalDirection.Backward); precedingText = new CharacterBufferRange(precedingTextString, 0, precedingTextString.Length); StaticTextPointer pointer = position.CreateStaticPointer(); DependencyObject element = (pointer.Parent != null) ? pointer.Parent : _paraClient.Paragraph.Element; culture = DynamicPropertyReader.GetCultureInfo(element); } return new TextSpan ( nonTextLength + precedingText.Length, new CultureSpecificCharacterBufferRange(culture, precedingText) ); } /// /// Get Text effect index from text source character index. Return int value of Text effect index. /// /// /// dcp of CharacterHit relative to start of line /// internal override int GetTextEffectCharacterIndexFromTextSourceCharacterIndex(int dcp) { // Text effect index is an index relative to the start of the Text Container. // To convert a text source index to text effect index, we first convert the dcp into text pointer // and call GetDistance() from the start of the text container. ITextPointer position = TextContainerHelper.GetTextPointerFromCP(_paraClient.Paragraph.StructuralCache.TextContainer, _cpPara + dcp, LogicalDirection.Forward); return position.TextContainer.Start.GetOffsetToPosition(position); } #endregion TextSource Implementation internal PTS.FSFLRES GetFormatResultForBreakpoint(int dcp, TextBreakpoint textBreakpoint) { int dcpRun = 0; PTS.FSFLRES formatResult = PTS.FSFLRES.fsflrOutOfSpace; foreach (TextSpantextSpan in _runCache.GetTextRunSpans()) { TextRun run = textSpan.Value; if (run != null && ((dcpRun + run.Length) >= (dcp + textBreakpoint.Length))) { if (run is ParagraphBreakRun) { formatResult = ((ParagraphBreakRun)run).BreakReason; } else if (run is LineBreakRun) { formatResult = ((LineBreakRun)run).BreakReason; } break; } dcpRun += textSpan.Length; } return formatResult; } /// /// Measure child UIElement. /// /// /// Element whose size we are measuring /// ////// Size of the child UIElement /// internal Size MeasureChild(InlineObjectRun inlineObject) { // Always measure at infinity for bottomless, consistent constraint. double pageHeight = _paraClient.Paragraph.StructuralCache.CurrentFormatContext.DocumentPageSize.Height; if (!_paraClient.Paragraph.StructuralCache.CurrentFormatContext.FinitePage) { pageHeight = Double.PositiveInfinity; } return inlineObject.UIElementIsland.DoLayout(new Size(TextDpi.FromTextDpi(_durTrack), pageHeight), true, true); } ////// TextFormatter host /// private readonly TextFormatterHost _host; private TextRunCache _runCache; private int _durTrack; private int _cpPara; } } #pragma warning enable 1634, 1691 // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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