Move to a specific Pdf page

[James Randle]

Hi,

I have a ViewModel:

    public class ImportPdfViewModel : ReactiveObject

    {

        public ImportPdfViewModel(MainViewModel mainViewModel, IIOService openFileDialogService)

        {

            MainViewModel = mainViewModel;

            //

            this.WhenAnyValue(This => This.PdfFilePath).Where(x => x != null).Subscribe((pdfFilePath) =>

                  {

                      PdfDocumentStream = new FileStream(pdfFilePath, FileMode.OpenOrCreate, FileAccess.Read);

                  });

            //

            SelectFilePathCommand = ReactiveCommand

                .Create(() => openFileDialogService.OpenFileDialog(@"D:\jr-T\VS\Hardyman\DudleyVoidsProcessor\DataIn"));

            SelectFilePathCommand.Subscribe((pdfFilePath) => { PdfFilePath = pdfFilePath; });

            //

            ImportPdfDataCommand = ReactiveCommand.Create(() => { }, this.WhenAnyValue(This => This.PdfFilePath).Where(pdfFilePath => PdfFilePath != null).Any());

        }

        public MainViewModel MainViewModel { get; set; }

        private string _PdfFilePath;

        public string PdfFilePath

        {

            get => _PdfFilePath;

            set => this.RaiseAndSetIfChanged(ref _PdfFilePath, value);

        }

        private Stream _PdfDocumentStream;

        public Stream PdfDocumentStream

        {

            get => _PdfDocumentStream;

            set => this.RaiseAndSetIfChanged(ref _PdfDocumentStream, value);

        }

        public ReactiveCommand<Unit, String> SelectFilePathCommand { get; set; }

        public ReactiveCommand<Unit, Unit> ImportPdfDataCommand { get; set; }

    }

I would like to add a command that moves to a particular page eg:

        public ReactiveCommand<int, Unit> MoveToPageCommand{ get; set; }

that I can call like this (eg move to page 12):

        MoveToPageCommand.Execute(12);

The problem I have is that I cannot figure out what bindings i need to put in place on the PdfViewControl?

Cheers,

James.

[Karthikeyan Chandrasekar]

Hi James,  

As per your requirements, we have “GoToPageCommand” ICommand to navigate to pages in a PDF document. We can execute this command with page number as its parameter. Please find the UG link below to get further details on this:  

https://help.syncfusion.com/wpf/pdfviewer/working-with-command-binding/binding-commands-to-a-button#gotopagecommand  

We have created a simple sample to explain, how to bind GoToPageCommand to a button. Please confirm whether this sample helps you to achieve your requirement.  

http://www.syncfusion.com/downloads/support/directtrac/general/ze/WpfGoToPage740392954  

Regards, 

Karthikeyan 

[James Randle]

Hi,

No I'm afraid that doesn't help.

I want to be able to set the page number from within my ViewModel not via binding to a command.

I would expect this to be acheivable by doing something like binding to PdfViewerControl.PageNumber, but that property is not available in Xaml.

Cheers,

James.

[Karthik Krishnaraj]

Hi James, 

 

We have planned to expose API to get and set PageNumber in PdfViewer control and it will be available from our essential studio Volume 4 release which will be rolled out in the month of December 2018. 

 

Regards, 

Karthik.