Struct Callback 

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

Stores a function pointer that is executed when the given UI element is hit

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

Fields

cb: CallbackType

ctx: OptionRefAny

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

Implementations

impl Callback

pub fn create<C: Into<Callback>>(cb: C) -> Self

Create a new callback with just a function pointer (for native Rust code)

pub fn from_core(core: CoreCallback) -> Self

Convert from CoreCallback (stored as usize) to Callback (actual function pointer)

Safety

The caller must ensure that the usize in CoreCallback.cb was originally a valid function pointer of type CallbackType. This is guaranteed when CoreCallback is created through standard APIs, but unsafe code could violate this.

pub fn to_core(self) -> CoreCallback

Convert to CoreCallback (function pointer stored as usize)

This is always safe - we’re just casting the function pointer to usize for storage.

impl Callback

pub fn invoke(&self, data: RefAny, info: CallbackInfo) -> Update

Safely invoke the callback with the given data and info

This is a safe wrapper around calling the function pointer directly.

Trait Implementations

impl Clone for Callback

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Callback

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

Formats the value using the given formatter.

impl Display for Callback

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

Formats the value using the given formatter.

impl From<Callback> for ButtonOnClickCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> ButtonOnClickCallback

Converts to this type from the input type.

impl From<Callback> for CheckBoxOnToggleCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> CheckBoxOnToggleCallback

Converts to this type from the input type.

impl From<Callback> for ColorInputOnValueChangeCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> ColorInputOnValueChangeCallback

Converts to this type from the input type.

impl From<Callback> for CoreCallback

Allow Callback to be passed to functions expecting C: Into<CoreCallback>

fn from(callback: Callback) -> Self

Converts to this type from the input type.

impl From<Callback> for DropDownOnChoiceChangeCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> DropDownOnChoiceChangeCallback

Converts to this type from the input type.

impl From<Callback> for FileInputOnPathChangeCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> FileInputOnPathChangeCallback

Converts to this type from the input type.

impl From<Callback> for ListViewOnColumnClickCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> ListViewOnColumnClickCallback

Converts to this type from the input type.

impl From<Callback> for ListViewOnLazyLoadScrollCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> ListViewOnLazyLoadScrollCallback

Converts to this type from the input type.

impl From<Callback> for ListViewOnRowClickCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> ListViewOnRowClickCallback

Converts to this type from the input type.

impl From<Callback> for NumberInputOnFocusLostCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> NumberInputOnFocusLostCallback

Converts to this type from the input type.

impl From<Callback> for NumberInputOnValueChangeCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> NumberInputOnValueChangeCallback

Converts to this type from the input type.

impl From<Callback> for OnNodeAddedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> OnNodeAddedCallback

Converts to this type from the input type.

impl From<Callback> for OnNodeConnectedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> OnNodeConnectedCallback

Converts to this type from the input type.

impl From<Callback> for OnNodeDraggedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> OnNodeDraggedCallback

Converts to this type from the input type.

impl From<Callback> for OnNodeFieldEditedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> OnNodeFieldEditedCallback

Converts to this type from the input type.

impl From<Callback> for OnNodeGraphDraggedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> OnNodeGraphDraggedCallback

Converts to this type from the input type.

impl From<Callback> for OnNodeInputDisconnectedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> OnNodeInputDisconnectedCallback

Converts to this type from the input type.

impl From<Callback> for OnNodeOutputDisconnectedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> OnNodeOutputDisconnectedCallback

Converts to this type from the input type.

impl From<Callback> for OnNodeRemovedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> OnNodeRemovedCallback

Converts to this type from the input type.

impl From<Callback> for RibbonOnTabClickedCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> RibbonOnTabClickedCallback

Converts to this type from the input type.

impl From<Callback> for TabOnClickCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> TabOnClickCallback

Converts to this type from the input type.

impl From<Callback> for TextInputOnFocusLostCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> TextInputOnFocusLostCallback

Converts to this type from the input type.

impl From<Callback> for TextInputOnTextInputCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> TextInputOnTextInputCallback

Converts to this type from the input type.

impl From<Callback> for TextInputOnVirtualKeyDownCallback

Allow creating widget callback from a generic Callback This enables Python/FFI code to pass generic callbacks to widget methods

fn from(cb: Callback) -> TextInputOnVirtualKeyDownCallback

Converts to this type from the input type.

impl From<extern "C" fn(RefAny, CallbackInfo) -> Update> for Callback

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

fn from(cb: CallbackType) -> Self

Converts to this type from the input type.

impl Hash for Callback

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

where H: Hasher,

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 Callback

fn cmp(&self, other: &Self) -> 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 Callback

fn eq(&self, rhs: &Self) -> 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 Callback

fn partial_cmp(&self, other: &Self) -> 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 Callback