thumbnailOpacity static method

double thumbnailOpacity(
  1. double progress
)

Thumbnail selector bar opacity. Visible at progress < 0.4, fades out linearly. opacity = 1 - progress * 2 (clamped to 0.0–1.0).

Implementation

static double thumbnailOpacity(double progress) {
  final t = progress.clamp(0.0, 1.0);
  return (1.0 - t * 2.5).clamp(0.0, 1.0);
}