trackColor property
      
      Color
      get
      trackColor
      
    
    
    
Implementation
Color get trackColor => _trackColor;
      
      set
      trackColor
      (Color value) 
      
    
    
    
Implementation
set trackColor(Color value) {
  if (_trackColor != value) {
    _trackColor = value;
    markNeedsSegmentsPaint();
  }
}