whenOrNull<TResult extends Object?> method Null safety

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. {TResult? border(
    1. BorderSide top,
    2. BorderSide right,
    3. BorderSide bottom,
    4. BorderSide left
    )?,
  2. TResult? directional(
    1. BorderSide top,
    2. BorderSide start,
    3. BorderSide end,
    4. BorderSide bottom
    )?,
  3. TResult? roundedRectangle(
    1. BorderSide side,
    2. BorderRadius borderRadius
    )?,
  4. TResult? stadium(
    1. BorderSide side
    )?,
  5. TResult? oval(
    1. BorderSide side,
    2. double eccentricity
    )?,
  6. TResult? circle(
    1. BorderSide side,
    2. double eccentricity
    )?,
  7. TResult? continuousRectangle(
    1. BorderSide side,
    2. BorderRadius borderRadius
    )?,
  8. TResult? beveledRectangle(
    1. BorderSide side,
    2. BorderRadius borderRadius
    )?,
  9. TResult? underlineInput(
    1. BorderSide side,
    2. BorderRadius borderRadius
    )?,
  10. TResult? outlineInput(
    1. BorderSide side,
    2. BorderRadius borderRadius,
    3. double gapPadding
    )?,
  11. TResult? noneInput(
      )?,
    1. TResult? star(
      1. BorderSide side,
      2. double points,
      3. double innerRadiusRatio,
      4. double pointRounding,
      5. double valleyRounding,
      6. double rotation,
      7. double squash
      )?}
    )
    @optionalTypeArgs, inherited

    Implementation

    @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  TResult? Function(BorderSide top, BorderSide right, BorderSide bottom,
          BorderSide left)?
      border,
  TResult? Function(BorderSide top, BorderSide start, BorderSide end,
          BorderSide bottom)?
      directional,
  TResult? Function(BorderSide side, BorderRadius borderRadius)?
      roundedRectangle,
  TResult? Function(BorderSide side)? stadium,
  TResult? Function(BorderSide side, double eccentricity)? oval,
  TResult? Function(BorderSide side, double eccentricity)? circle,
  TResult? Function(BorderSide side, BorderRadius borderRadius)?
      continuousRectangle,
  TResult? Function(BorderSide side, BorderRadius borderRadius)?
      beveledRectangle,
  TResult? Function(BorderSide side, BorderRadius borderRadius)?
      underlineInput,
  TResult? Function(
          BorderSide side, BorderRadius borderRadius, double gapPadding)?
      outlineInput,
  TResult? Function()? noneInput,
  TResult? Function(
          BorderSide side,
          double points,
          double innerRadiusRatio,
          double pointRounding,
          double valleyRounding,
          double rotation,
          double squash)?
      star,
}) =>
    throw _privateConstructorUsedError;