I'm trying to find a method to detect if Windows 10 is in tablet mode or not. Please note, this is not about querying whether the user has a Tablet PC or not - that can be solved with GetSystemMetrics(SM_CONVERTIBLESLATEMODE). In my case the above function always returns 0 - whether Win10 is in tablet mode or not.
This thread without an epilogue seems to suggest that there is no WinAPI call that could detect Tablet mode. I hope that isn't the case, since there are different WM messages posted by the OS if it's in tablet mode or not. In tablet mode WM_SHOWWINDOW isn't sent which means I need to address the launching of the application differently if Windows 10 is in tablet mode.
I could just move the code that is currently triggered after receiving the WM_SHOWWINDOW message somewhere else (just after ShowWindow is called), but then I get a WM_DPICHANGED message with null parameters.
You can use UIViewSettings.UserInteractionMode @Raymond pointed out.
Refer to "Tablet mode" "How can I detect whether my PC is in tablet mode?"
来源：https://stackoverflow.com/questions/55225753/how-to-detect-if-windows-10-is-in-tablet-mode