Q1:

The class which implements the controller is SnappingSheetController.

Features:

• snapToPosition - set a specific position in the sheet (with animation)

• setSnappingSheetPosition – same but without animation.

• currentPosition – get current position in the sheet

• currentlySnapping – check if the sheet is currently snapping

• stopCurrentSnapping – stop current snapping

Q2:

_animationController is the one who controls the animation.

• This object is from type AnimationController

Q3:

• GestureDetector has a lot more options and features than InkWell

• InkWell has the options to add decorations such as colors, or ripple, etc.