Enum ToolbarMorph 

pub enum ToolbarMorph {}

The expand ramp’s pure geometry: what the bar’s expand progress does to the adjacent FAB’s square and to the revealing pill’s opacity — an uninhabited namespace type (no instance is ever constructed), the same shape crate::MaterialSpring’s own token namespace uses.

use frust_material::ToolbarMorph;

// Collapsed is the 80dp end; expanded the 56dp one.
assert_eq!(ToolbarMorph::size(0.0), 80.0);
assert_eq!(ToolbarMorph::size(1.0), 56.0);
assert_eq!(ToolbarMorph::size(0.5), 68.0);

// The spring's overshoot past 1 is real travel, never clamped away.
assert!(ToolbarMorph::size(1.1) < 56.0);
// …but never negative, whatever the input.
assert_eq!(ToolbarMorph::size(f64::NAN), 80.0);

// The pill stays invisible through the ramp's first half.
assert_eq!(ToolbarMorph::reveal_alpha(0.5), 0.0);
assert_eq!(ToolbarMorph::reveal_alpha(1.0), 1.0);

Implementations

impl ToolbarMorph

pub fn size(progress: f64) -> f64

The FAB’s square at expand progress — _resolvedFabSize’s own fabMedium + (fabBaseline - fabMedium) * progress, floored at zero and NaN-mapped to the collapsed (resting) end.

pub fn reveal_alpha(progress: f64) -> f64

The revealing pill’s opacity at expand progress — upstream’s Interval(0.5, 1, curve: Curves.easeIn), whose control points (Curve::EaseIn, cubic-bezier(0.42, 0, 1, 1)) are Flutter’s Curves.easeIn exactly. See TOOLBAR_REVEAL_FADE_START.

Trait Implementations

impl Debug for ToolbarMorph

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.