[native_pdf_view] Open a certain page when document is loaded

[MahmoudAshours]

Describe the bug
I want to animate or jump to a certain page when document is loaded at the very start of rendering.

To Reproduce
1 - I tried to jump to a certain page when document is loaded in
onDocumentLoaded: (PdfDocument document) { _pdfController.jumpToPage(10); },

But I faced an exception :
Reloaded 9 of 868 libraries in 854ms. D/PDF_RENDER( 6672): OpenFileDocument. File: /data/user/0/projectname/cache/file_picker/Short-stories-from-100-Selected-Stories.pdf E/flutter ( 6672): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: type '_AssertionError' is not a subtype of type 'Exception' �[38;5;248mE/flutter ( 6672): #0 PdfController._loadDocument�[39;49m E/flutter ( 6672): <asynchronous suspension> �[38;5;248mE/flutter ( 6672): #1 PdfController._attach�[39;49m �[38;5;248mE/flutter ( 6672): #2 _PdfViewState.initState�[39;49m �[38;5;244mE/flutter ( 6672): #3 StatefulElement._firstBuild�[39;49m �[38;5;244mE/flutter ( 6672): #4 ComponentElement.mount�[39;49m �[38;5;244mE/flutter ( 6672): #5 Element.inflateWidget�[39;49m �[38;5;244mE/flutter ( 6672): #6 Element.updateChild�[39;49m �[38;5;244mE/flutter ( 6672): #7 SingleChildRenderObjectElement.mount�[39;49m �[38;5;244mE/flutter ( 6672): #8 Element.inflateWidget�[39;49m �[38;5;244mE/flutter ( 6672): #9 Element.updateChild�[39;49m �[38;5;244mE/flutter ( 6672): #10 ComponentElement.performRebuild�[39;49m �[38;5;244mE/flutter ( 6672): #11 Element.rebuild�[39;49m �[38;5;244mE/flutter ( 6672): #12 ComponentElement._firstBuild�[39;49m �[38;5;244mE/flutter ( 6672): #13 ComponentElement.mount�[39;49m �[38;5;244mE/flutter ( 6672): #14 Element.inflateWidget�[39;49m �[38;5;244mE/flutter ( 6672): #15 Element.updateChild�[39;49m �[38;5;244mE/flutter ( 6672): #16 ComponentElement.performRebuild�[39;49m �[38;5;244mE/flutter ( 6672): #17 Element.rebuild�[39;49m �[38;5;244mE/flutter ( 6672): #18 ComponentElement._firstBuild�[39;49m �[38;5;244mE/flutter ( 6672): #19 ComponentElement.mount�[39;49m �[38;5;244mE/flutter ( 6672): #20 Element.inflateWidget�[39;49m �[38;5;244mE/flutter ( 6672): #21 Element.updateChild�[39;49m �[38;5;244mE/flutter ( 6672): #22 ComponentElement.performRebuild�[39;49m �[38;5;244mE/flutter ( 6672): #23 Element.rebuild�[39;49m �[38;5;244mE/flutter ( 6672): #24 ComponentElement._firstBuild�[39;49m �[38;5;244mE/flutter ( 6672): #25 ComponentElement.mount�[39;49m �[38;5;244mE/flutter ( 6672): #26 Element.inflateWidget�[39;49m �[38;5;244mE/flutter ( 6672): #27 Element.updateChild�[39;49m �[38;5;244mE/flutter ( 6672): #28 ComponentElement.performRebuild�[39;49m �[38;5;244mE/flutter ( 6672): #29 Element.rebuild�[39;49m �[38;5;244mE/flutter ( 6672): #30 ComponentElement._firstBuild�[39;49m �[38;5;244mE/flutter ( 6672): #31 ComponentElement.mount�[39;49m �[38;5;244mE/flutter ( 6672): #32 Element.inflateWidget�[39;49m �[38;5;244mE/flutter ( 6672): #33 MultiChildRenderObjectElement.mount�[39;49m �[38;5;244mE/flutter ( 6672): #34 Element.inflateWidget�[39;49m �[38;5;244mE/flutter ( 6672): #35 Element.updateChild�[39;49m �[38;5;244mE/flutter ( 6672): #36 ComponentElement.performRebuild�[39;49m �[38;5;244mE/flutter ( 6672): #37 StatefulElement.performRebuild�[39;49m �[38;5;244mE/flutter ( 6672): #38 Element.rebuild�[39;49m �[38;5;244mE/flutter ( 6672): #39 ComponentElement._firstBuild�[39;49m �[38;5;244mE/flutter ( 6672): #40 StatefulElement._firstBuild�[39;49m �[38;5;244mE/flutter ( 6672): #41 ComponentElement.mount�[39;49m �[38;5;244mE/flutter ( 6672): #42 Element.inflateWidget�[39;49m �[38;5;244mE/flutter ( 6672): #43 Element.updateChild�[39;49m �[38;5;244mE/flutter ( 6672): #44 ComponentElement.performRebuild�[39;49m E/flutter ( 6672): #45 Element.rebuild (package:flutter/src/w

Expected behavior
I expected to open on the page I requested.

Screenshots

Smartphone (please complete the following information):

• Device: Android emulator Pixel 3a
• OS: Android
• Version : API 28

[SergeShkurko]

and how many pages do you have in the document?
in 3.6.0 problem with errorBuilder fixed
can you copy the error code?

[copypasteearth]

Im having the same problem

[Jonathan-Harty]

I am running into the same problem with the animateToPage method, it seems that the scroll controller is not getting attached to the scroll view when any jumping around pages is done.

[Jonathan-Harty]

It seems that the _positions list on the _pageController on the _pdfController does not get items until after the onDocumentLoaded function is called leading to the _positions.isNotEmpty assertion to fail.

[BrucesStuff]

According to the API, It seems to me that setting the initialPage parameter of the PdfController to >1 should cause the PDF to open at that page.

However this parameter seems to be ignored.

Looking into the code, I see that in the PdfController's _attach() method the initialPage is passed to _reInitPageController(), but not passed into _loadDocument(), which then calls _reInitPageController() again with an initialPage of 1 from its default parameter.

[Jonathan-Harty]

I have already made a pull request that should fix the initialPage problem

[rahulserver]

Yes i too found the same issue like @BrucesStuff commented. The initialPage params seems to be ignored.