Struct SizeChangeHintEvent

pub struct SizeChangeHintEvent {
    pub node_id: u32,
    pub width_change_factor: f32,
    pub height_change_factor: f32,
}

Delivered in response to a size change hint from a parent node (SendSizeChangeHintCmd).

This event is delivered when the following conditions are true:

• The node has kSizeChangeEventMask set to an enabled state.
• A parent node has sent a SendSizeChangeHintCmd.

Subscribe to this event to receive information about how large textures you will need in the near future for your nodes. The canonical use case is to pre-allocate memory to avoid repeated re-allocations.

Fields

node_id: u32

width_change_factor: f32

height_change_factor: f32

Trait Implementations

impl Clone for SizeChangeHintEvent

fn clone(&self) -> SizeChangeHintEvent

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for SizeChangeHintEvent

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

Formats the value using the given formatter.

impl<D: ResourceDialect> Decode<SizeChangeHintEvent, D> for SizeChangeHintEvent

fn new_empty() -> Self

Creates a valid instance of Self. The specific value does not matter, since it will be overwritten by decode.

unsafe fn decode( &mut self, decoder: &mut Decoder<'_, D>, offset: usize, _depth: Depth, ) -> Result<()>

Decodes an object of type T from the decoder’s buffers into self.

impl<D: ResourceDialect> Encode<SizeChangeHintEvent, D> for &SizeChangeHintEvent

unsafe fn encode( self, encoder: &mut Encoder<'_, D>, offset: usize, _depth: Depth, ) -> Result<()>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl<D: ResourceDialect, T0: Encode<u32, D>, T1: Encode<f32, D>, T2: Encode<f32, D>> Encode<SizeChangeHintEvent, D> for (T0, T1, T2)

unsafe fn encode( self, encoder: &mut Encoder<'_, D>, offset: usize, depth: Depth, ) -> Result<()>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl PartialEq for SizeChangeHintEvent

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

fn partial_cmp(&self, other: &SizeChangeHintEvent) -> 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 TypeMarker for SizeChangeHintEvent

type Owned = SizeChangeHintEvent

The owned Rust type which this FIDL type decodes into.

fn inline_align(_context: Context) -> usize

Returns the minimum required alignment of the inline portion of the encoded object. It must be a (nonzero) power of two.

fn inline_size(_context: Context) -> usize

Returns the size of the inline portion of the encoded object, including padding for alignment. Must be a multiple of inline_align.

fn encode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and encoding requires no validation. When true, we can optimize encoding arrays and vectors of Self::Owned to a single memcpy.

fn decode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and decoding requires no validation. When true, we can optimize decoding arrays and vectors of Self::Owned to a single memcpy.

impl ValueTypeMarker for SizeChangeHintEvent

type Borrowed<'a> = &'a SizeChangeHintEvent

The Rust type to use for encoding. This is a particular Encode<Self> type cheaply obtainable from &Self::Owned. There are three cases:

fn borrow(value: &<Self as TypeMarker>::Owned) -> Self::Borrowed<'_>

Cheaply converts from &Self::Owned to Self::Borrowed.

impl Copy for SizeChangeHintEvent

impl Persistable for SizeChangeHintEvent

impl StructuralPartialEq for SizeChangeHintEvent