Enum BuildCause 

pub enum BuildCause {
    First,
    Data,
    Hover,
    Press,
    Focus,
    Scroll,
    Viewport,
    Clock,
    Remote,
    System,
}

Why the views ran again. It is the first question about a slow screen: every rebuild costs in proportion to the whole screen.

Variants

First

The first build.

Data

A State that the views read changed.

Hover

The pointer moved onto something else.

Press

Something was pressed or released.

Focus

Focus moved.

Scroll

Content that depends on its scroll position moved.

Viewport

The window changed size or scale.

Clock

A view asked to run again at a certain time.

Remote

Another thread asked through a waker.

System

A platform service was installed or a system setting changed.

Implementations

impl BuildCause

pub const ALL: [Self; 10]

Every cause, in the order BuildCauses counts them.

Trait Implementations

impl Clone for BuildCause

fn clone(&self) -> BuildCause

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BuildCause

impl Debug for BuildCause

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

Formats the value using the given formatter.

impl Default for BuildCause

fn default() -> BuildCause

Returns the “default value” for a type.

impl Eq for BuildCause

impl Hash for BuildCause

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for BuildCause

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BuildCause