Popping a route from the route itself

[Girildo]

Hi!
I am not sure how to 'redirect' the navigator from within a route.
I have a custom route that subclasses PageRoute, this route should asynchronously wait for a task to complete and then pop itself off the stack.

What I'd need is a way to call Navigator.Pop(context) from within the route lifetime methods.

I am not sure how to solve this issue: I've tried hacking something in the BuildPage method, but it feels dirty as it's an awkward attempt at shoehorning side effects in the build method.

I settled on the following

    internal class CameraPage : PageRoute
    {
        private readonly PhotoCaptureService photoCaptureService;

        public CameraPage(PhotoCaptureService photoCaptureService)
            : base(new RouteSettings("TakePicture", RouteModalType.Fullscreen))
        {
            this.photoCaptureService = photoCaptureService;
        }

        protected override async Task OnFocus()
        {
            try
            {
                var ph = await this.photoCaptureService.TakePicture(); // the async operation
                this.SetResult(ph);
            }
            catch (OperationCanceledException)
            {
                this.SetResult(false);
            }
            finally
            {
                await this.ApplyScreenEvent(ScreenEvent.Unfocus);
                await this.ApplyScreenEvent(ScreenEvent.Destroy);
            }
        }

         protected override sealed Widget BuildTransitions(
            BuildContext context,
            AnimationController animation,
            AnimationController secondaryAnimation,
            Widget child
        )
        {
            return new CompositeTransition
            {
                Opacity = secondaryAnimation.Drive(new FloatTween(0, 1)),
                Child = new CompositeTransition
                {
                    Opacity = animation.Drive(new FloatTween(0, 1)),
                    Child = new Empty(),
                }
            };
        }

}

This seems to work, in the sense that the fading animation of the CameraPage route is actually executed, but the route never gets popped off the stack.

Thanks in advance for any help 🙏

[vanifatovvlad]

You can send a command to close the route immediately after opening it:

Navigator.Push(context, ...);
Navigator.Pop(context);

An alternative solution is to move the asynchronous logic into a widget:

public override async void InitState()
{
  await this.photoCaptureService.TakePicture();
  Navigator.Pop(Context);
}

[Girildo]

Yeah, I ended up encapsulating the whole thing in a 'mock' widget.
Thanks!