alpha property

int alpha

The amount to multiply into the alpha channel.

The opacity is expressed as an integer from 0 to 255, where 0 is fully transparent and 255 is fully opaque.

The scene must be explicitly recomposited after this property is changed (as described at Layer).

Implementation 

int get alpha => _alpha;
void alpha= (int value)

Implementation 

set alpha(int value) {
  if (value != _alpha) {
    _alpha = value;
    markNeedsAddToScene();
  }
}