Struct CoreCallback 

#[repr(C)]
pub struct CoreCallback {
    pub cb: CoreCallbackType,
    pub ctx: OptionRefAny,
}

Stores a callback as usize (actually a function pointer cast to usize)

IMPORTANT: The cb field stores a function pointer disguised as usize to avoid circular dependencies between azul-core and azul-layout. When creating a CoreCallback, you can directly assign a function pointer - Rust will implicitly cast it to usize. When invoking, the usize must be unsafely cast back to the function pointer type.

Must return an Update that denotes if the screen should be redrawn.

Fields

cb: CoreCallbackType

ctx: OptionRefAny

For FFI: stores the foreign callable (e.g., PyFunction) Native Rust code sets this to None

Trait Implementations

impl Clone for CoreCallback

fn clone(&self) -> CoreCallback

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CoreCallback

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

Formats the value using the given formatter.

impl From<usize> for CoreCallback

Allow creating CoreCallback from a raw function pointer (as usize) Sets callable to None (for native Rust/C usage)

fn from(cb: CoreCallbackType) -> Self

Converts to this type from the input type.

impl Hash for CoreCallback

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 CoreCallback

fn cmp(&self, other: &CoreCallback) -> 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 CoreCallback

fn eq(&self, other: &CoreCallback) -> 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 CoreCallback

fn partial_cmp(&self, other: &CoreCallback) -> 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 Eq for CoreCallback

impl StructuralPartialEq for CoreCallback