Enum RelayoutReason 

#[repr(C)]
pub enum RelayoutReason {
    Initial = 0,
    RefreshDom = 1,
    Resize = 2,
    ThemeChange = 3,
    RouteChange = 4,
    Other = 5,
}

What triggered the current layout() invocation.

The framework re-invokes the layout callback for any change that may produce a structurally different DOM (resize across a CSS breakpoint, theme toggle, route switch, callback returning Update::RefreshDom). LayoutCallbackInfo::relayout_reason() exposes which trigger this particular call corresponds to so the callback can branch — for example, skip expensive analytics on Resize calls.

Variants

Initial = 0

First layout call for this window.

RefreshDom = 1

A user callback returned Update::RefreshDom.

Resize = 2

Window size changed across a CSS breakpoint or DPI scale change. The callback can branch on info.window_width_* to emit a different tree (e.g. hamburger menu vs sidebar).

ThemeChange = 3

System theme changed (light/dark).

RouteChange = 4

CallbackInfo::switch_route or set_route_param produced a new route match. The callback should branch on info.get_active_route().

Other = 5

Catch-all for relayouts that don’t fit one of the above categories.

Trait Implementations

impl Clone for RelayoutReason

fn clone(&self) -> RelayoutReason

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RelayoutReason

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

Formats the value using the given formatter.

impl Default for RelayoutReason

fn default() -> Self

Returns the “default value” for a type.

impl Hash for RelayoutReason

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 Ord for RelayoutReason

fn cmp(&self, other: &RelayoutReason) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for RelayoutReason

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for RelayoutReason

fn partial_cmp(&self, other: &RelayoutReason) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for RelayoutReason

impl Eq for RelayoutReason

impl StructuralPartialEq for RelayoutReason