Optional halt cell execution until file selected

[jesseengel]

Hi, nice plugin!

I was wondering if there would be a way to halt the execution of the cell until a file is selected / callback activated. This would be helpful for situations where you are executing cells in order, and don't want the next cell to run until the filechooser has done its thing. I tried put a while loop with sleep until the callback happens, but then can't interact with the file chooser.

[crahan]

I'm not sure if widgets have the ability to interact with the notebook itself in that way. I'd be happy to investigate some options if you have come across any.

Anyone had any thoughts on how to achieve this? I'm writing an application which will be run exclusively in a jupyter notebook. I need the user to input a path to a file in a friendly way. There's no possibility of a proper gui so Tkinter won't work for this, and I really like ipyfilechooser, but want to get it to wait for the user selection, much like input() would.