Flutter: detecting tap on multiple widgets

Question

I have a Row of 4 buttons, what if I want to call a different callback (or same function with different arguments) on tap on every individual button and on every combination of buttons (simultaneously pressing two or more buttons).

I have no clue.

Answer 1

1. First you'll need to wrap each button with a GestureDetector , read more about these here

2. You need a method,(_handleMultiTouch) to handle all the onTapDown , onTapUp and onTapCancel events.

   onTapDown => _handleMultiTouch(..somebuttonId, the event)

3. In _handleMultiTouch(int id, var event) is where you'll declare all the logic for handling multi touch. Here you'll save if user has tapped one or two button, or the user stopped a tap on button 1, etc. Use a switch or a if statment and save the touch states.