Is there a listener to listen to file changes?

Hi,

I am developing a plugin that shows information/tips about the class that is currently open. But to refresh the information, I now have to constantly press a button.

I would like to have a listener that listens to when a file is changed inside a project, so it can automaticly refresh the content in the window. But sadly I could not find the "topic" to set the listener to.

Does anyone know how I can achieve this?

Thanks in advance!