Check In & Check Out in One Line Without Using Action Button

[IshwarG]

HI Team, I am building a Timesheet apps, as follows :

1. Taking Input (Check in & Check Out) using QR Code 

2. Check Out Comes if Check in is not Blank.

3. But  I am confuse to handle single row data . (i.e. Check in and Check Out in one rows and Calculate Total Hour Duration) but I don't want to press action button In Check-In Row. I want to scan QR and Take a Check-Out Input in Check-In Input Row.

How can I solve it. please guide me . Thanks in advance.