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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / documents / ContentHostHelper.cs / 1 / ContentHostHelper.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: ContentHostHelper.cs // // Description: The ContentHostHelper class contains static methods that are // useful for performing common tasks with IContentHost. // //--------------------------------------------------------------------------- using System; // Object using System.Collections.Generic; // Listusing System.Windows; // IContentHost using System.Windows.Controls; // TextBlock using System.Windows.Controls.Primitives; // DocumentPageView using System.Windows.Documents; // FlowDocument using System.Windows.Media; // Visual using MS.Internal.PtsHost; // FlowDocumentPage namespace MS.Internal.Documents { /// /// Static helper functions for dealing with IContentHost. /// internal static class ContentHostHelper { //------------------------------------------------------------------- // // Internal Methods // //------------------------------------------------------------------- #region Internal Methods ////// Given a ContentElement searches for associated IContentHost, if one exists. /// /// Content element ///Associated IContentHost with ContentElement. internal static IContentHost FindContentHost(ContentElement contentElement) { IContentHost ich = null; DependencyObject parent; TextContainer textContainer; if (contentElement == null) { return null; } // If the ContentElement is a TextElement, retrieve IContentHost form the owner // of TextContainer. if (contentElement is TextElement) { textContainer = ((TextElement)contentElement).TextContainer; parent = textContainer.Parent; if (parent is IContentHost) // TextBlock { ich = (IContentHost)parent; } else if (parent is FlowDocument) // Viewers { ich = GetICHFromFlowDocument((TextElement)contentElement, (FlowDocument)parent); } else if (textContainer.TextView != null && textContainer.TextView.RenderScope is IContentHost) { // TextBlock hosted in ControlTemplate ich = (IContentHost)textContainer.TextView.RenderScope; } } // else; cannot retrive IContentHost return ich; } #endregion Internal Methods //-------------------------------------------------------------------- // // Private Methods // //------------------------------------------------------------------- #region Private Methods ////// Given a ContentElement within FlowDocument searches for associated IContentHost. /// /// Content element /// FlowDocument hosting ContentElement. ///Associated IContentHost with ContentElement. private static IContentHost GetICHFromFlowDocument(TextElement contentElement, FlowDocument flowDocument) { IContentHost ich = null; ListpageViews; ITextView textView = flowDocument.StructuralCache.TextContainer.TextView; if (textView != null) { // If FlowDocument is hosted by FlowDocumentScrollViewer, the RenderScope // is FlowDocumentView object which hosts PageVisual representing the content. // This PageVisual is also IContentHost for the entire content of DocumentPage. if (textView.RenderScope is FlowDocumentView) // FlowDocumentScrollViewer { if (VisualTreeHelper.GetChildrenCount(textView.RenderScope) > 0) { ich = VisualTreeHelper.GetChild(textView.RenderScope, 0) as IContentHost; } } // Our best guess is that FlowDocument is hosted by DocumentViewerBase. // In this case search the style for all DocumentPageViews. // Having collection of DocumentPageViews, find for the one which hosts TextElement. else if (textView.RenderScope is FrameworkElement) { pageViews = new List (); FindDocumentPageViews(textView.RenderScope, pageViews); for (int i = 0; i < pageViews.Count; i++) { if (pageViews[i].DocumentPage is FlowDocumentPage) { textView = (ITextView)((IServiceProvider)pageViews[i].DocumentPage).GetService(typeof(ITextView)); if (textView != null && textView.IsValid) { // Check if the page contains ContentElement. Check Start and End // position, which will give desired results in most of the cases. // Having hyperlink spanning more than 2 pages is not very common, // and this code will not work with it correctly. if (textView.Contains(contentElement.ContentStart) || textView.Contains(contentElement.ContentEnd)) { ich = pageViews[i].DocumentPage.Visual as IContentHost; } } } } } } return ich; } /// /// Does deep Visual tree walk to retrieve all DocumentPageViews. /// It stops recursing down into visual tree in following situations: /// a) Visual is UIElement and it is not part of Contol Template, /// b) Visual is DocumentPageView. /// /// FrameworkElement that is part of Control Template. /// Collection of DocumentPageViews; found elements are appended here. ///Whether collection of DocumentPageViews has been updated. private static void FindDocumentPageViews(Visual root, ListpageViews) { Invariant.Assert(root != null); Invariant.Assert(pageViews != null); if (root is DocumentPageView) { pageViews.Add((DocumentPageView)root); } else { FrameworkElement fe; // Do deep tree walk to retrieve all DocumentPageViews. // It stops recursing down into visual tree in following situations: // a) Visual is UIElement and it is not part of Contol Template, // b) Visual is DocumentPageView. // Add to collection any DocumentPageViews found in the Control Template. int count = root.InternalVisualChildrenCount; for (int i = 0; i < count; i++) { Visual child = root.InternalGetVisualChild(i); fe = child as FrameworkElement; if (fe != null) { if (fe.TemplatedParent != null) { if (fe is DocumentPageView) { pageViews.Add(fe as DocumentPageView); } else { FindDocumentPageViews(fe, pageViews); } } } else { FindDocumentPageViews(child, pageViews); } } } } #endregion Private Methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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