Struct WidgetId 

pub struct WidgetId(pub u64);

Unique identifier for a widget instance.

Used as part of the cache key to distinguish between different widgets.

Creating WidgetIds

From pointer (stable for widget lifetime):

WidgetId::from_ptr(&my_widget)

From content hash (stable across recreations):

WidgetId::from_hash(&my_widget.text)

From arbitrary u64:

WidgetId(42)

Tuple Fields

0: u64

Implementations

impl WidgetId

pub fn from_ptr<T>(ptr: &T) -> Self

Create a WidgetId from a memory address.

Stable for the lifetime of the widget. Use when the widget instance persists across multiple layout passes.

Note

If the widget is recreated (e.g., in a loop), the pointer will change. For such cases, prefer WidgetId::from_hash.

pub fn from_hash<T: Hash>(value: &T) -> Self

Create a WidgetId from a content hash.

Stable across widget recreations as long as content is the same. Use when widgets are ephemeral (created each frame) but content is stable.

Trait Implementations

impl Clone for WidgetId

fn clone(&self) -> WidgetId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WidgetId

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

Formats the value using the given formatter.

impl Hash for WidgetId

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 WidgetId

fn eq(&self, other: &WidgetId) -> 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 Copy for WidgetId

impl Eq for WidgetId

impl StructuralPartialEq for WidgetId