Struct HeaderState 

pub struct HeaderState {
    pub fraction: f32,
    pub height: f32,
    pub width: f32,
    pub expanded_height: f32,
    pub collapsed_height: f32,
}

How far collapsed the header is, handed to its builder every frame it moves.

Fields

fraction: f32

0.0 fully expanded, 1.0 fully collapsed. What a header should be written against: a size, an opacity or a corner interpolated on this reads the same whatever the two heights happen to be, and survives somebody changing them.

height: f32

The height the header is being drawn at, in logical pixels.

width: f32

How wide it is — the page, not the title.

Handed over because a header has to state it: a box left to size itself is as wide as its own content, which is a band with the list showing either side of it. The first golden of this widget was exactly that, and no test measuring heights could have seen it.

expanded_height: f32

The height it has when nothing has scrolled.

collapsed_height: f32

The height it stops at, or 0 for a header that goes entirely.

Trait Implementations

impl Clone for HeaderState

fn clone(&self) -> HeaderState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for HeaderState

impl Debug for HeaderState

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

Formats the value using the given formatter.

impl PartialEq for HeaderState

fn eq(&self, other: &HeaderState) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for HeaderState