syncfusion-uwp-pdf-viewer

# Implementing UWP PDF Viewer (SfPdfViewerControl) The Syncfusion `SfPdfViewerControl` is a native UWP control for viewing, annotating, searching, and printing PDF documents. It uses the Windows rendering engine (`Windows.Data.Pdf`) by default and supports an optional PDFium renderer. ## Security Notice ⚠️ **When loading PDFs from untrusted or user-provided sources, always validate hyperlinks and content before allowing navigation.** PDFs can contain malicious hyperlinks that may direct users to untrusted websites or perform unintended actions. Always implement hyperlink validation using the `HyperlinkPointerPressed` event to inspect and authorize navigation targets before allowing them. See [references/bookmarks-and-hyperlinks.md](references/bookmarks-and-hyperlinks.md) for validation code examples. ## When to Use This Skill Use this skill when you need to: - View and navigate PDF documents in UWP applications - Load PDFs from streams, StorageFile objects, or byte arrays - Add and manage annotations (highlight, underline, strikethrough, ink, shapes, free text, popup, stamp) - Search and select text within PDF documents - Navigate pages, bookmarks, and hyperlinks (with proper validation for untrusted sources) - Print PDF documents with custom quality and preview settings - Create custom toolbars wired to PDF Viewer commands - Configure zoom, view modes, scrollbar, and progress ring - Localize the viewer UI - Export PDF pages as images or use the PDFium custom renderer ## Component Overview **SfPdfViewerControl** is a comprehensive PDF viewing and management control for UWP with these capabilities: - **Document Management:** Load from PdfLoadedDocument, Stream, or StorageFile (sync and async with CancellationToken); save with annotations; unload and dispose - **Annotations:** Text markup (highlight, underline, strikethrough), shape (rectangle, ellipse, line), ink with Windows Ink Canvas support, popup (sticky note), free text, free text callout, and custom stamp annotations - **Text Operation:** Text selection with color customization, synchronous and asynchronous text search with next/previous navigation - **Navigation & UI:** Page navigation commands, bookmarks, hyperlink handling, zoom/view modes, thumbnail view, separate desktop and mobile toolbar layouts, scrollbar and progress ring customization - **Utilities & Advanced:** Export pages as images (GetPage, GetPages, ExportAsImage), vertical/horizontal offset access, PDFium custom renderer via IPdfRenderer interface, page number display ## Documentation and Navigation Guide ### Getting Started & Setup 📄 **Read:** [references/getting-started.md](references/getting-started.md) - Covers required assemblies, NuGet packages, adding the control via XAML or code, ItemsSource binding, and the DocumentLoaded event - Explains synchronous and asynchronous loading methods, page count access, saving (Save/SaveAsync), unloading, and disposing ### Document Operations 📄 **Read:** [references/viewing-pdf.md](references/viewing-pdf.md) - Describes loading PDFs from PdfLoadedDocument, Stream, and StorageFile objects using both sync and async approaches - Covers CancellationToken support for async loading, saving with annotations, and viewer unload/dispose patterns ### Page Navigation & Viewing 📄 **Read:** [references/page-navigation.md](references/page-navigation.md) - Explains programmatic page navigation, built-in navigation commands (FirstPage, LastPage, NextPage, PreviousPage), and XAML command binding - Covers the PageChanged event, page count, page gap, offset collection, and toggling the page number display ### Magnification & View Modes 📄 **Read:** [references/magnification.md](references/magnification.md) - Covers zoom control via ZoomTo, increase/decrease zoom commands, and view mode options (FitWidth, Normal, OnePage) - Explains MinimumZoomPercentage, thumbnail view toggle, and reading the current zoom value ### Text Search 📄 **Read:** [references/text-operations.md](references/text-operations.md) - Explains synchronous and asynchronous text search, forward/backward result navigation, and SearchNextCommand/SearchPreviousCommand - Covers GetTextCoordinates for retrieving the page positions of all text matches ### Text Selection 📄 **Read:** [references/text-operations.md](references/text-operations.md) - Describes enabling text selection, customizing the selection highlight color, and the TextSelectionCompleted event - Covers copying selected text to the clipboard ### Annotations 📄 **Read:** [references/annotations.md](references/annotations.md) - Covers all supported annotation types: text markup (highlight, underline, strikethrough), shapes (rectangle, ellipse, line), ink with Windows Ink Canvas, popup, free text, free text callout, and custom stamps - Explains annotation events (Added, Tapped, Selected, Removed, MovedOrResized), deleting annotations, AnnotationCollection, undo/redo, and the IsDocumentEdited property ### Printing 📄 **Read:** [references/printing.md](references/printing.md) - Explains the Print method, PrintCommand, and async printing with CancellationToken support - Covers QualityFactor, customizing or disabling the print preview dialog, and setting the document name via PrinterSettings ### Bookmarks & Hyperlinks 📄 **Read:** [references/bookmarks-and-hyperlinks.md](references/bookmarks-and-hyperlinks.md) - Explains navigating to bookmarks via GoToBookmark and retrieving the bookmark collection from PdfLoadedDocument - **🔒 REQUIRED - Hyperlinks Validation:** Provides essential code examples for inspecting and validating hyperlinks via `HyperlinkPointerPressed` events. **Always validate hyperlink sources from untrusted PDFs before allowing navigation** to prevent malicious redirects and injection attacks. See the reference document for secure implementation patterns. ### Localization 📄 **Read:** [references/localization.md](references/localization.md) - Covers setting the default language in the app manifest and adding .resw resource files for UI string localization - Explains supported resource file names and changing the context menu language ### Gesture Events & Interaction 📄 **Read:** [references/utilities.md](references/utilities.md) - Covers pointer events on hyperlinks (HyperlinkPointerPressed, HyperlinkPointerMoved) for custom interaction handling - Explains using the PageChanged and DocumentLoaded events to drive post-navigation and post-load workflows ### Utilities & Advanced 📄 **Read:** [references/utilities.md](references/utilities.md) - Covers exporting PDF pages as BitmapImage objects (GetPage, GetPages) and as image streams (ExportAsImage) - Explains accessing vertical/horizontal scroll offsets, using the PDFium custom renderer via IPdfRenderer, and the ShowPageNumber and VerticalScrollBarWidth properties