opacity property Null safety
final
The fraction to scale the sliver child's alpha value.
An opacity of 1.0 is fully opaque. An opacity of 0.0 is fully transparent (i.e. invisible).
The opacity must not be null.
Values 1.0 and 0.0 are painted with a fast path. Other values require painting the sliver child into an intermediate buffer, which is expensive.
Implementation
final double opacity;