bobld/caly

Caly Pdf Reader is a cross-platform pdf document reader application written in C#

Caly Pdf Reader

About

Caly Pdf Reader is a cross-platform pdf document reader application written in C# (net8.0 with AOT), only using Avalonia & SkiaSharp + PdfPig for the UI / pdf rendering part. It is released under GPL-3.0 license.

Important

The development is currently in alpha.

Preview

Goal and Roadmap

The aim is to develop a C# cross-platform open source pdf reader/viewer application. Below is a table of the current progress:

Task	Priority	Progress	Comment	TODO
View pdf document	High	Done		Performance to improve
Open many documents with tab system	High	Done	Use Tabalonia	Bugs to fix - see #11
Navigate and zoom document (go to page, zoom in/out, etc.)	High	Done		Performance to improve
Text selection	High	Done		Improve rendering by merging words into lines
Copy text selection to clipboard	High	Done
Search text	High	Done		Improve word matching
Printing	High	Work in Progress	See branch. Way more complicated than expected without using System.Drawing. See https://github.com/Zelenov/SharpIpp dotnet/maui#9931 https://devblogs.microsoft.com/xamarin/native-printing-with-android/
Run JavaScript embedded in a PDF	Won't do	Not started	Use Jint
UI / UX	Low	Work in Progress	How the app feels	Need better colors, icons, transitions, etc.
OCR	Low	Not started	Use RapidOCR onnx models, see RapidOcrNet
Table extraction	Low	Not started	Use tabula-sharp or camelot-sharp

Windows, Linux, MacOS and mobile compatible

As of now, only the Windows, Linux and Android versions have been tested. Android version runs, but is not optimised for the platfotm. Better mobile support is planned, including iOS.

Contributions are welcome

Feel free to contribute to the project! You can also help Caly Pdf Reader by contributing to:

• https://github.com/UglyToad/PdfPig
• https://github.com/BobLd/PdfPig.Rendering.Skia

Clone and build

Caly Pdf Reader uses submodules, you will need to run the following after cloning it:

git submodule update --init --recursive

Caly Pdf Reader is a net8.0 application with Native AOT (ahead of time compilation) enabled. To publish the application, run the following (example for Windows):

dotnet publish -r win-x64 -c Release -f net8.0

caly's Issues

Bug with pages duplicates when drag/drop tabs

Bug with WindowNotificationManager creation

System.NullReferenceException: Object reference not set to an instance of an object.
   at Avalonia.Rendering.Composition.Compositor.RegisterForSerialization(ICompositorSerializable) + 0x8d
   at Avalonia.Rendering.Composition.CompositionVisual.set_Visible(Boolean) + 0x59
   at Avalonia.Rendering.Composition.CompositionVisual.InitializeDefaults() + 0x18
   at Avalonia.Visual.CreateCompositionVisual(Compositor) + 0x89
   at Avalonia.Visual.AttachToCompositor(Compositor) + 0x26
   at Avalonia.Visual.OnAttachedToVisualTreeCore(VisualTreeAttachmentEventArgs) + 0x166
   at Avalonia.Layout.Layoutable.OnAttachedToVisualTreeCore(VisualTreeAttachmentEventArgs) + 0x19
   at Avalonia.Controls.Control.OnAttachedToVisualTreeCore(VisualTreeAttachmentEventArgs) + 0x30
   at Avalonia.Visual.SetVisualParent(Visual) + 0xeb
   at Avalonia.Visual.SetVisualParent(IList, Visual) + 0x6c
   at Avalonia.Collections.AvaloniaList`1.NotifyAdd(T, Int32) + 0x72
   at Avalonia.Controls.Primitives.VisualLayerManager.get_AdornerLayer() + 0x1ca
   at Avalonia.Controls.Notifications.WindowNotificationManager.InstallFromTopLevel(TopLevel) + 0x1ef
   at Caly.Core.Views.MainWindow.OnLoaded(RoutedEventArgs) + 0xae
   at Avalonia.Controls.Control.<>c.<.cctor>b__69_0() + 0xe9
   at Avalonia.Threading.DispatcherOperation.InvokeCore() + 0x28a
   at Avalonia.Threading.DispatcherOperation.Execute() + 0x73
   at Avalonia.Threading.Dispatcher.ExecuteJob(DispatcherOperation) + 0x5d
   at Avalonia.Threading.Dispatcher.ExecuteJobsCore(Boolean) + 0xa4
   at Avalonia.Threading.Dispatcher.Signaled() + 0x41
   at Avalonia.Win32.Win32Platform.WndProc(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam) + 0x58
   at Caly!<BaseAddress>+0xe4993a

Look into new SkiaSharp 3 SKPicture.Playback() feature

mono/SkiaSharp#2883
mono/SkiaSharp#2881

should i fix the dependencies problem?

I also noticed that there is a significant difference between the PDFPig version and the official version. Should I use the latest one or stick with this one?

Current page selected changes when switching tab documents

• Open 2 docs, one with more pages than the other.
• Get the document tab active for the doc with most pages and select the last page (doc 1).
• Change tab to the other document (less pages, doc 2).
• Switch back to doc 1-> The current selected page is last page of doc 2 +1

System.IndexOutOfRangeException