How to use onTap and Draggable together in flutter?

I need a widget to receive the onTap event and is draggable.

child: GestureDetector(
    onTap: _setVisibleSelect(),
    child: Draggable<Color>(
      data: Color(0x000000ff),
      child: Image.asset('assets/photo.png', color: Colors.yellow, width: 60, height: 60,),
      feedback: Image.asset('assets/photo.png', color: Colors.yellow, width: 60, height: 60,),
      childWhenDragging: Container(),
      ),

I can see _setVisibleSelect() doesn't work when onTap but Dragging. How can I use two event together?