Primary constructor experiments

opacity.dart

// Current
class Opacity extends SingleChildRenderObjectWidget {
  /// Creates a widget that makes its child partially transparent.
  ///
  /// The [opacity] argument must be between zero and one, inclusive.
  const Opacity({
    super.key,
    required this.opacity,
    this.alwaysIncludeSemantics = false,
    super.child,
  }) : assert(opacity >= 0.0 && opacity <= 1.0);

  /// Lots of comments.
  ///
  /// Lots of comments.
  final double opacity;

  /// Lots of comments
  ///
  /// Lots of comments.
  final bool alwaysIncludeSemantics;
  ...
}

// Using a primary header constructor
class const Opacity({
  super.key,
  /// Lots of comments.
  ///
  /// Lots of comments.
  required double opacity,

  /// Lots of comments.
  ///
  /// Lots of comments.
  bool alwaysIncludeSemantics = false,
  super.child,
}) : assert(opacity >= 0.0 && opacity <= 1.0)
 extends SingleChildRenderObjectWidget {

}

// Using a primary body constructor
class Opacity extends SingleChildRenderObjectWidget {
  /// Creates a widget that makes its child partially transparent.
  ///
  /// The [opacity] argument must be between zero and one, inclusive.
  const this({
    super.key,

    /// Lots of comments.
    ///
    /// Lots of comments.
    required double opacity,

    /// Lots of comments.
    ///
    /// Lots of comments.
    bool alwaysIncludeSemantics = false,

	super.child,
  }) : assert(opacity >= 0.0 && opacity <= 1.0);
}