Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PtsHost / BaseParaClient.cs / 1305600 / BaseParaClient.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // Description: BaseParagraph provides identity for displayable part of // paragraph in PTS world. // // History: // 05/05/2003 : [....] - moving from Avalon branch. // 10/30/2004 : [....] - ElementReference cleanup. // //--------------------------------------------------------------------------- using System; using System.Collections.Generic; // ReadOnlyCollection using System.Collections; using System.Diagnostics; using System.Security; using System.Windows; using System.Windows.Documents; // TextPointer using System.Windows.Media; using MS.Internal; using MS.Internal.Documents; // ParagraphResult using MS.Internal.Text; using MS.Internal.PtsHost.UnsafeNativeMethods; namespace MS.Internal.PtsHost { // --------------------------------------------------------------------- // BaseParagraph provides identity for displayable part of paragraph in // PTS world. // --------------------------------------------------------------------- internal abstract class BaseParaClient : UnmanagedHandle { //-------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors // ------------------------------------------------------------------ // Constructor. // // paragraph - Paragraph owner of the ParaClient. // ------------------------------------------------------------------ ////// Critical - as this invokes the constructor for SecurityCriticalDataForSet. /// Safe - as this just initializes to zero. /// [SecurityCritical, SecurityTreatAsSafe] protected BaseParaClient(BaseParagraph paragraph) : base(paragraph.PtsContext) { _paraHandle = new SecurityCriticalDataForSet(IntPtr.Zero); _paragraph = paragraph; } #endregion Constructors //------------------------------------------------------------------- // // Internal Methods // //-------------------------------------------------------------------- #region Internal Methods // ----------------------------------------------------------------- // Update internal cache of ParaClient and arrange its content. // // paraDesc - paragraph handle // rcPara - rectangle of the paragraph // dvrTopSpace - top space calculated as a result of margin // collapsing // fswdirParent - Flow direction of track // ----------------------------------------------------------------- /// /// Critical, because: /// a) calls the setter _paraHandle.Value and passes the parameter it /// gets directly. /// [SecurityCritical] internal void Arrange(IntPtr pfspara, PTS.FSRECT rcPara, int dvrTopSpace, uint fswdirParent) { // Make sure that paragraph handle (PFSPARA) is set. It is required to query paragraph content. Debug.Assert(_paraHandle.Value == IntPtr.Zero || _paraHandle.Value == pfspara); _paraHandle.Value = pfspara; // Set paragraph rectangle (relative to the page) _rect = rcPara; // Cache dvrTopSpace // Note: currently used only by tight geometry bound calculation code _dvrTopSpace = dvrTopSpace; // Current page context (used for mirroring and offsets) _pageContext = Paragraph.StructuralCache.CurrentArrangeContext.PageContext; // Cache flow directions _flowDirectionParent = PTS.FswdirToFlowDirection(fswdirParent); _flowDirection = (FlowDirection)Paragraph.Element.GetValue(FrameworkElement.FlowDirectionProperty); // Do paragraph specifc arrange OnArrange(); } // ----------------------------------------------------------------- // Returns baseline for first text line // ------------------------------------------------------------------ internal virtual int GetFirstTextLineBaseline() { return _rect.v + _rect.dv; } // ----------------------------------------------------------------- // Transfer display related information from another ParaClient. // // oldParaClient - another ParaClient // ------------------------------------------------------------------ internal void TransferDisplayInfo(BaseParaClient oldParaClient) { Debug.Assert(oldParaClient._visual != null); // Transfer visual node ownership _visual = oldParaClient._visual; oldParaClient._visual = null; } // ------------------------------------------------------------------ // Hit tests to the correct IInputElement within the paragraph // that the mouse is over. // ----------------------------------------------------------------- internal virtual IInputElement InputHitTest(PTS.FSPOINT pt) { return null; } // ------------------------------------------------------------------ // Returns ArrayList of rectangles for the ContentElement e. // Returns empty list if the paraClient does not contain e. // start: int representing start offset of e // length: int representing number of characters occupied by e. // parentOffset: indicates offset of parent element. Used only by // subpage para clients when calculating rectangles // ----------------------------------------------------------------- internal virtual ListGetRectangles(ContentElement e, int start, int length) { // Return empty collection as default return new List (); } // ----------------------------------------------------------------- // Returns rectangles for a the Paragraph element if we have found // that it matches the element for which rectangles are needed. // Converts the _rect member to the layout DPI and returns it // ----------------------------------------------------------------- internal virtual void GetRectanglesForParagraphElement(out List rectangles) { rectangles = new List (); // Convert rect from Text DPI values Rect rect = TextDpi.FromTextRect(_rect); rectangles.Add(rect); } // ------------------------------------------------------------------ // Validate visual node associated with paragraph. // // fskupdInherited - inherited update info // ----------------------------------------------------------------- internal virtual void ValidateVisual(PTS.FSKUPDATE fskupdInherited) { } // ------------------------------------------------------------------ // Updates the para content with current viewport // // ------------------------------------------------------------------ internal virtual void UpdateViewport(ref PTS.FSRECT viewport) { } // ----------------------------------------------------------------- // Create paragraph result representing this paragraph. // ------------------------------------------------------------------ internal abstract ParagraphResult CreateParagraphResult(); // ----------------------------------------------------------------- // Return TextContentRange for the content of the paragraph. // ----------------------------------------------------------------- internal abstract TextContentRange GetTextContentRange(); #endregion Internal Methods //------------------------------------------------------------------- // // Internal Properties // //-------------------------------------------------------------------- #region Internal Properties // ----------------------------------------------------------------- // Visual associated with paragraph // ------------------------------------------------------------------ internal virtual ParagraphVisual Visual { get { if (_visual == null) { _visual = new ParagraphVisual(); } return _visual; } } // ------------------------------------------------------------------ // Is this the first chunk of paginated content. // ----------------------------------------------------------------- internal virtual bool IsFirstChunk { get { return true; } } // ------------------------------------------------------------------ // Is this the last chunk of paginated content. // ----------------------------------------------------------------- internal virtual bool IsLastChunk { get { return true; } } // ----------------------------------------------------------------- // Paragraph owner of the ParaClient. // ----------------------------------------------------------------- internal BaseParagraph Paragraph { get { return _paragraph; } } // ------------------------------------------------------------------ // Rect of para client // ----------------------------------------------------------------- internal PTS.FSRECT Rect { get { return _rect; } } internal FlowDirection ThisFlowDirection { get { return _flowDirection; } } internal FlowDirection ParentFlowDirection { get { return _flowDirectionParent; } } internal FlowDirection PageFlowDirection { get { return Paragraph.StructuralCache.PageFlowDirection; } } #endregion Internal Properties //-------------------------------------------------------------------- // // Protected Methods // //-------------------------------------------------------------------- #region Protected Methods // ----------------------------------------------------------------- // Arrange paragraph. // ------------------------------------------------------------------ protected virtual void OnArrange() { Paragraph.UpdateLastFormatPositions(); } #endregion Protected Methods //------------------------------------------------------------------- // // Protected Fields // //------------------------------------------------------------------- #region Protected Fields // ----------------------------------------------------------------- // Paragraph owner of the ParaClient. // ------------------------------------------------------------------ protected readonly BaseParagraph _paragraph; // ----------------------------------------------------------------- // PTS paragraph handle. // ------------------------------------------------------------------ /// /// _paraHandle is passed to some Critical PTS functions and will be written /// to directly in managed code. Hence encapsulating this so all code that /// sets this variable will become critical. /// protected SecurityCriticalDataForSet_paraHandle; // ------------------------------------------------------------------ // Rectangle occupied by this portion of the paragraph (relative // to the page). // ----------------------------------------------------------------- protected PTS.FSRECT _rect; // ------------------------------------------------------------------ // TopSpace value for the paragraph (margin accumulated // during margin collapsing process). // ----------------------------------------------------------------- protected int _dvrTopSpace; // ----------------------------------------------------------------- // Associated visual. // ----------------------------------------------------------------- protected ParagraphVisual _visual; // ------------------------------------------------------------------ // Page context // ----------------------------------------------------------------- protected PageContext _pageContext; // ------------------------------------------------------------------ // Cached flow directions // ------------------------------------------------------------------ protected FlowDirection _flowDirectionParent; protected FlowDirection _flowDirection; #endregion Protected Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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