c++ - Override Close Box on Windows 10 Universal Apps UWP

Question

I'm trying to prevent the app from being closed by clicking the Close box on the App Window. For example, having a text editor with unsaved changes, upon pressing Close Box, I would first display, "Do you want to save changes before exiting?"

How can I detect app wanting to close and prevent that from happening?

I'm using C++, and this needs to be for Windows 10 Universal Apps UWP. I already know how to do this for Win32.

Answer 1

The comments are correct. There is currently no way for a regular Store app to do this.

However, with the Creators Update (and corresponding SDK) we have included a preview API that you can now check out for this functionality:

The Windows.UI.Core.Preview.SystemNavigationManagerPreview class provides a CloseRequested event that an app can mark as handled. For the event to work the app will need to declare the restricted 'confirmAppClose' capability per: https://docs.microsoft.com/en-us/windows/uwp/packaging/app-capability-declarations

Please let us know your feedback.

Thanks, Stefan Wick - Windows Developer Platform