UIElementParaClient.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PtsHost / UIElementParaClient.cs / 1305600 / UIElementParaClient.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// Description: UIElementParaClient class is responsible for handling display 
//              related data of BlockUIContainers.
// 
//--------------------------------------------------------------------------- 

using System;                                   // IntPtr 
using System.Collections.Generic;               // List
using System.Collections.ObjectModel;           // ReadOnlyCollection
using System.Security;                          // SecurityCritical
using System.Windows;                           // FrameworkElement 
using System.Windows.Media;                     // Visual
using System.Windows.Documents;                 // BlockUIContainer 
using MS.Internal.Documents;                    // ParagraphResult, UIElementIsland 
using MS.Internal.Text;                         // TextDpi
using MS.Internal.PtsHost.UnsafeNativeMethods;  // PTS 

namespace MS.Internal.PtsHost
{
    ///  
    /// FloaterParaClient class is responsible for handling display related
    /// data of paragraphs associated with nested floaters. 
    ///  
    internal sealed class UIElementParaClient : FloaterBaseParaClient
    { 
        //-------------------------------------------------------------------
        //
        //  Constructors
        // 
        //-------------------------------------------------------------------
 
        #region Constructors 

        ///  
        /// Constructor.
        /// 
        /// 
        internal UIElementParaClient(FloaterBaseParagraph paragraph) 
            : base(paragraph)
        { 
        } 

        #endregion Constructors 

        //--------------------------------------------------------------------
        //
        //  Internal Methods 
        //
        //------------------------------------------------------------------- 
 
        #region Internal Methods
 
        /// 
        /// Arrange paragraph.
        /// 
        ///  
        /// Critical - as this calls Critical function PTS.FsQueryFloaterDetails
        /// Safe - The IntPtr parameters passed to PTS.FsQueryFloaterDetails are SecurityCriticalDataForSet 
        ///        which ensures that partial trust code won't be able to set it to a random value. 
        ///        The textdetails parameter passed to other methods is generated securely in this function.
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        protected override void OnArrange()
        {
            base.OnArrange(); 

            PTS.FSFLOATERDETAILS floaterDetails; 
            PTS.Validate(PTS.FsQueryFloaterDetails(PtsContext.Context, _paraHandle.Value, out floaterDetails)); 

            // Get paragraph's rectangle. 
            _rect = floaterDetails.fsrcFloater;

            MbpInfo mbp = MbpInfo.FromElement(Paragraph.Element);
            if(ParentFlowDirection != PageFlowDirection) 
            {
                mbp.MirrorMargin(); 
 
                PTS.FSRECT pageRect = _pageContext.PageRect;
                PTS.Validate(PTS.FsTransformRectangle(PTS.FlowDirectionToFswdir(ParentFlowDirection), ref pageRect, ref _rect, PTS.FlowDirectionToFswdir(PageFlowDirection), out _rect)); 
            }

            _rect.u += mbp.MarginLeft;
            _rect.du -= mbp.MarginLeft + mbp.MarginRight; 
            _rect.du = Math.Max(TextDpi.ToTextDpi(TextDpi.MinWidth), _rect.du);
            _rect.dv = Math.Max(TextDpi.ToTextDpi(TextDpi.MinWidth), _rect.dv); 
        } 

        ///  
        /// Returns collection of rectangles for the BlockUIContainer element.
        /// If the element is not the paragraph's owner, empty collection is returned.
        /// 
        internal override List GetRectangles(ContentElement e, int start, int length) 
        {
            List rectangles = new List(); 
            if (Paragraph.Element == e) 
            {
                // We have found the element. Return rectangles for this paragraph. 
                GetRectanglesForParagraphElement(out rectangles);
            }
            return rectangles;
        } 

        ///  
        /// Validates visual node associated with paragraph. 
        /// 
        internal override void ValidateVisual(PTS.FSKUPDATE fskupdInherited) 
        {
            // Obtain all mbd info
            MbpInfo mbp = MbpInfo.FromElement(Paragraph.Element);
 
            // MIRROR entire element to interface with underlying layout tree.
            // Border/Padding does not need to be mirrored, as it'll be mirrored with the content. 
            PtsHelper.UpdateMirroringTransform(PageFlowDirection, ThisFlowDirection, _visual, TextDpi.FromTextDpi(2 * _rect.u + _rect.du)); 

            // Add UIElementIsland to visual tree and set appropiate offset. 
            UIElementIsland uiElementIsland = ((UIElementParagraph)Paragraph).UIElementIsland;
            if (uiElementIsland != null)
            {
                if (_visual.Children.Count != 1 || _visual.Children[0] != uiElementIsland) 
                {
                    // Disconnect UIElementIsland from its old parent. 
                    Visual currentParent = VisualTreeHelper.GetParent(uiElementIsland) as Visual; 
                    if (currentParent != null)
                    { 
                        ContainerVisual parent = currentParent as ContainerVisual;
                        Invariant.Assert(parent != null, "Parent should always derives from ContainerVisual.");
                        parent.Children.Remove(uiElementIsland);
                    } 

                    _visual.Children.Clear(); 
                    _visual.Children.Add(uiElementIsland); 
                }
                uiElementIsland.Offset = new PTS.FSVECTOR(_rect.u + mbp.BPLeft, _rect.v + mbp.BPTop).FromTextDpi(); 
            }
            else
            {
                _visual.Children.Clear(); 
            }
 
            // Draw background and borders. 
            Brush backgroundBrush = (Brush)Paragraph.Element.GetValue(TextElement.BackgroundProperty);
            _visual.DrawBackgroundAndBorder(backgroundBrush, mbp.BorderBrush, mbp.Border, _rect.FromTextDpi(), IsFirstChunk, IsLastChunk); 
        }

        /// 
        /// Returns tight bounding path geometry. 
        /// 
        internal Geometry GetTightBoundingGeometryFromTextPositions(ITextPointer startPosition, ITextPointer endPosition) 
        { 
            if (startPosition.CompareTo(((BlockUIContainer)Paragraph.Element).ContentEnd) < 0 &&
                endPosition.CompareTo(((BlockUIContainer)Paragraph.Element).ContentStart) > 0) 
            {
                return new RectangleGeometry(_rect.FromTextDpi());
            }
            return null; 
        }
 
        ///  
        /// Creates paragraph result representing this paragraph.
        ///  
        /// 
        internal override ParagraphResult CreateParagraphResult()
        {
            return new UIElementParagraphResult(this); 
        }
 
        ///  
        /// Hit tests to the correct IInputElement within the paragraph that
        /// the mouse is over. 
        /// 
        internal override IInputElement InputHitTest(PTS.FSPOINT pt)
        {
            if (_rect.Contains(pt)) 
            {
                return Paragraph.Element as IInputElement; 
            } 
            return null;
        } 

        /// 
        /// Returns TextContentRange for the content of the paragraph.
        ///  
        internal override TextContentRange GetTextContentRange()
        { 
            BlockUIContainer elementOwner = (BlockUIContainer)Paragraph.Element; 
            return TextContainerHelper.GetTextContentRangeForTextElement(elementOwner);
        } 

        #endregion Internal Methods
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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UIElementParaClient.cs source code in C# .NET

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