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| Guest | Re: DocumentViewer, annotations and XPS Hi Jens, In answer to your questions: For #1: I'm not certain if we understand your question. If you're looking to do a "stamp" type annotation using an image as a background on the annotation, you may be able to do this through styling to set a background image. An Annotation Styling sample has just been added to the SDK and will be available shortly at MSDN on-line. A preliminary version of the annotations styling sample is available at Derek Mehlhorn's blog at http://blogs.msdn.com/mehlhorn/default.aspx. For #2: Yes, DocumentViewer does automatically virtualize content, so only the pages visible are loaded into memory at runtime. For an example of dynamically creating and writing an XPS document see the "Creating an XPS Document Sample" at http://windowssdk.msdn.microsoft.com.../ms771596.aspx. For #3: Yes, DocumentViewer supports Hyperlink navigation when it is inside an object that is a NavigationService (http://windowssdk.msdn.microsoft.com....windows.navig ation.navigationservice.aspx), such as Frame (http://windowssdk.msdn.microsoft.com....windows.contr ols.frame.aspx) or NavigationWindow (http://windowssdk.msdn.microsoft.com...ms615518.aspx). You can attach an event handler to the Frame.Navigating (http://windowssdk.msdn.microsoft.com....windows.contr ols.frame.navigating.aspx) event or NavigationWindow.Navigating (http://windowssdk.msdn.microsoft.com....windows.navig ation.navigationwindow.navigating.aspx) event for special handling of hyperlink navigations. (For more information see the Navigation Overview at http://windowssdk.msdn.microsoft.com.../ms750478.aspx. Thanks for your interest in .NET 3.0! Jack Davis Microsoft Windows Client SDK -----Original Message----- From: Jens Posted At: Friday, September 29, 2006 1:53 AM Posted To: microsoft.public.windows.developer.winfx.avalon Conversation: DocumentViewer, annotations and XPS Subject: DocumentViewer, annotations and XPS Hi all, I had a quick look at the DocumentViewer control and the usage samples in SDK. It is a promising approach for my application to build a viewer showing various document formats by first convertig them to XPS and use this control for display and print. Some general question regarding the design of my application: 1) Annotations The samples also demonstrates using annotations. But I have the requirement to display an extendes set of custom annotations (graphical objects, stamps, etc.) Is it intended by the design to integrate custom annotations in the framework? What would be the way to do this? Derive from System.Windows.Annotations.Annotation? 2) dynamic XPS creation at runtime When I have documents containings several thousands of pages it is not feasible to download them completely. Does the control suppport dynamic generation of individual pages at runtime? Is there a mechanism like UI virtualization built in to support this? The scenario is: User triggers command display page 3411, application should render this single page to XPS and display it. 3) Hyperlinks Does the XPS spec and the DocumentViewer control support some form of hyperlink where the application intecepts the activation of the hyperlink and processes it. Any help hints or available sample code would be appreciated. Thanks Jens |
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| Guest | Re: DocumentViewer, annotations and XPS Hi Jack, thank you for your detailed answer, this helped a lot! Regarding #1 your proposal sounds promising. I will have to become more familiar with this. For #3 this sounds exactly what I looked for. Regarding #2 I studied the sample, understood more about the architecture :-) but now have to state more precisely my requirements. XpsCreate shows me how to dynamically create a FixedDoc on the fly. This is the first part of a solution for my problem. Let's assume I have a document containing 50.000 pages (yes they really exist). Using the approach of the sample I would create a FixedDocument but would need 50000 calls of fixedDocument.Pages.Add(pageContent). Each pageContent instance has text and other elements. Even if the DocumentViewer control renders only the visible pages I feel that creating all these objects consumes very much time and memory. What I think of is a design where I create the page content of individual pages only on demand. If I understood well this is the task of the Paginator class, so I would need my own DocumentPaginator class overriding the GetPage() and GetPageAsync() methods. The implementation of my subclass would generate the page object on demand and return it as result of a GetPage() call. But my problem is that I see no way to make FixedDocument aware of my Paginator (only get, no set property). I would not even need a FixedDocument at all: the control requires only a paginator. But trying this results in an exception that the control only supports FixedDocuments and FlowDocuments... why? (see also my post from 10/17/2006 and sorry for duplicating the info, I got lost between forums and newsgroups of MSDN). Another limitation I see is that it seems that all pages of a FixedDocument must have the same size. In this way even mixing portrait and landscape pages would not be possible inside of a FixedDocument. Thanks again Jens |
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