decoration property

Decoration decoration

What to paint on the Material.

The decoration is painted at the position and size of the referenceBox, on the Material that owns the controller.

Implementation 

Decoration get decoration => _decoration;
void decoration= (Decoration value)

Implementation 

set decoration(Decoration value) {
  if (value == _decoration)
    return;
  _decoration = value;
  _painter?.dispose();
  _painter = _decoration?.createBoxPainter(_handleChanged);
  controller.markNeedsPaint();
}