Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / DocumentReference.cs / 1305600 / DocumentReference.cs
//---------------------------------------------------------------------------- //// Copyright (C) 2004 by Microsoft Corporation. All rights reserved. // // // Description: // Implements the DocumentReference element // // History: // 05/13/2004 - Zhenbin Xu (ZhenbinX) - Created. // // //--------------------------------------------------------------------------- namespace System.Windows.Documents { using MS.Internal; using MS.Internal.AppModel; using MS.Internal.Documents; using MS.Internal.Utility; using MS.Internal.Navigation; using MS.Internal.PresentationFramework; // SecurityHelper using System.Reflection; using System.Windows; // DependencyID etc. using System.Windows.Navigation; using System.Windows.Markup; using System.Windows.Threading; // Dispatcher using System; using System.ComponentModel; using System.Diagnostics; using System.IO; using System.IO.Packaging; using System.Net; using System.Security; //===================================================================== ////// DocumentReference is the class that references a Document. /// Each document /// [UsableDuringInitialization(false)] public sealed class DocumentReference : FrameworkElement, IUriContext { //------------------------------------------------------------------- // // Connstructors // //---------------------------------------------------------------------- #region Constructors ////// Default DocumentReference constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public DocumentReference() : base() { _Init(); } #endregion Constructors //------------------------------------------------------------------- // // Public Methods // //---------------------------------------------------------------------- #region Public Methods ////// Synchonrously download and parse the document based on the Source specification. /// If a document was attached earlier and forceReload == false, the attached /// document will be returned. forceReload == true results in downloading of the referenced /// document based on Source specification, any previously attached document is ignored /// in this case. /// Regardless of forceReload, the document will be loaded based on Source specification if /// it hasn't been loaded earlier. /// /// Force reloading the document instead of using cached value ///The document tree public FixedDocument GetDocument(bool forceReload) { DocumentsTrace.FixedDocumentSequence.IDF.Trace(string.Format("DocumentReference.GetDocument ({0}, {1})", Source == null ? new Uri("", UriKind.RelativeOrAbsolute) : Source, forceReload)); VerifyAccess(); FixedDocument idp = null; if (_doc != null) { idp = _doc; } else { if (!forceReload) { idp = CurrentlyLoadedDoc; } if (idp == null) { FixedDocument idpReloaded = _LoadDocument(); if (idpReloaded != null) { DocumentsTrace.FixedDocumentSequence.IDF.Trace(string.Format("DocumentReference.GetDocument Loaded IDP {0}", idpReloaded.GetHashCode())); // save the doc's identity _docIdentity = idpReloaded; idp = idpReloaded; } } } if (idp != null) { LogicalTreeHelper.AddLogicalChild(this.Parent, idp); } return idp; } ////// Attach a document to this DocumentReference /// You can only attach a document if it is not attached before or it is not created from URI before. /// /// public void SetDocument(FixedDocument doc) { VerifyAccess(); _docIdentity = null; _doc = doc; } #endregion Public Methods //-------------------------------------------------------------------- // // Public Properties // //--------------------------------------------------------------------- #region Public Properties ////// Dynamic Property to reference an external document stream. /// public static readonly DependencyProperty SourceProperty = DependencyProperty.Register( "Source", typeof(Uri), typeof(DocumentReference), new FrameworkPropertyMetadata( (Uri) null, new PropertyChangedCallback(OnSourceChanged))); static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DocumentsTrace.FixedDocumentSequence.IDF.Trace(string.Format("DocumentReference.Source_Invaidated")); DocumentReference docRef = (DocumentReference)d; if (!object.Equals(e.OldValue, e.NewValue)) { Uri oldSource = (Uri) e.OldValue; Uri newSource = (Uri) e.NewValue; DocumentsTrace.FixedDocumentSequence.IDF.Trace(string.Format("====Replace old doc {0} with new {1}", oldSource == null ? "null" : oldSource.ToString(), newSource == null? "null" : newSource.ToString())); // drop loaded document if source changed docRef._doc = null; // // #966803: Source change won't be a support scenario. // } } ////// Get/Set Source property that references an external page stream. /// public Uri Source { get { return (Uri) GetValue(SourceProperty); } set { SetValue(SourceProperty, value); } } #endregion Public Properties #region IUriContext ////// Uri IUriContext.BaseUri { get { return (Uri)GetValue(BaseUriHelper.BaseUriProperty); } set { SetValue(BaseUriHelper.BaseUriProperty, value); } } #endregion IUriContext //-------------------------------------------------------------------- // // Public Events // //--------------------------------------------------------------------- #region Public Event #endregion Public Event //------------------------------------------------------------------- // // Internal Methods // //--------------------------------------------------------------------- #region Internal Methods #if DEBUG internal void Dump() { DocumentsTrace.FixedDocumentSequence.Content.Trace(string.Format(" This {0}", this.GetHashCode())); DocumentsTrace.FixedDocumentSequence.Content.Trace(string.Format(" Source {0}", this.Source == null ? "null" : this.Source.ToString())); DocumentsTrace.FixedDocumentSequence.Content.Trace(string.Format(" _doc {0}", _doc == null ? 0 : _doc.GetHashCode())); DocumentsTrace.FixedDocumentSequence.Content.Trace(string.Format(" _docIdentity {0}", _docIdentity == null ? 0 : _docIdentity.GetHashCode())); } #endif #endregion Internal Methods //-------------------------------------------------------------------- // // Internal Properties // //--------------------------------------------------------------------- #region Internal Properties // return most recent result of GetDocument, if it is still alive internal FixedDocument CurrentlyLoadedDoc { get { return _docIdentity; } } #endregion Internal Properties //-------------------------------------------------------------------- // // private Properties // //---------------------------------------------------------------------- #region Private Properties #endregion Private Properties //------------------------------------------------------------------- // // Private Methods // //---------------------------------------------------------------------- #region Private Methods private void _Init() { this.InheritanceBehavior = InheritanceBehavior.SkipToAppNow; } ////// /// Critical as it access the base uri through GetUriToNavigate /// [SecurityCritical] private Uri _ResolveUri() { Uri uriToNavigate = this.Source; if (uriToNavigate != null) { uriToNavigate = BindUriHelper.GetUriToNavigate(this, ((IUriContext)this).BaseUri, uriToNavigate); } return uriToNavigate; } // [....] load a document ////// Critical as it access the base uri through _resolveUri /// TreatAsSafe since it does not disclose this /// [SecurityCritical, SecurityTreatAsSafe] private FixedDocument _LoadDocument() { FixedDocument idp = null; Uri uriToLoad = _ResolveUri(); if (uriToLoad != null) { ContentType mimeType = null; Stream docStream = null; docStream = WpfWebRequestHelper.CreateRequestAndGetResponseStream(uriToLoad, out mimeType); if (docStream == null) { throw new ApplicationException(SR.Get(SRID.DocumentReferenceNotFound)); } ParserContext pc = new ParserContext(); pc.BaseUri = uriToLoad; if (BindUriHelper.IsXamlMimeType(mimeType)) { XpsValidatingLoader loader = new XpsValidatingLoader(); idp = loader.Load(docStream, ((IUriContext)this).BaseUri, pc, mimeType) as FixedDocument; } else if (MS.Internal.MimeTypeMapper.BamlMime.AreTypeAndSubTypeEqual(mimeType)) { idp = XamlReader.LoadBaml(docStream, pc, null, true) as FixedDocument; } else { throw new ApplicationException(SR.Get(SRID.DocumentReferenceUnsupportedMimeType)); } idp.DocumentReference = this; } return idp; } #endregion Private Methods //------------------------------------------------------------------- // // Private Fields // //--------------------------------------------------------------------- #region Private Fields private FixedDocument _doc; private FixedDocument _docIdentity; // used to cache the identity of the IDF so the IDF knows where it come from. #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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