Struct LayoutCacheKey 

pub struct LayoutCacheKey {
    pub area_x: u16,
    pub area_y: u16,
    pub area_width: u16,
    pub area_height: u16,
    pub constraints_hash: u64,
    pub constraints_hash_fx: u64,
    pub constraints_len: u16,
    pub direction: Direction,
    pub intrinsics_hash: Option<u64>,
    pub intrinsics_hash_fx: Option<u64>,
}

Key for layout cache lookups.

Includes all parameters that affect layout computation:

• The available area (stored as components for Hash)
• A fingerprint of all constraints
• The length of the constraints slice
• The layout direction
• Optionally, a fingerprint of intrinsic size hints

Fields

area_x: u16

Area x-coordinate.

area_y: u16

Area y-coordinate.

area_width: u16

Area width.

area_height: u16

Area height.

constraints_hash: u64

Primary hash fingerprint of constraints.

constraints_hash_fx: u64

Secondary hash fingerprint of constraints (for 128-bit collision resistance).

constraints_len: u16

Length of constraints slice.

direction: Direction

Layout direction.

intrinsics_hash: Option<u64>

Primary hash fingerprint of intrinsic sizes (if using FitContent).

intrinsics_hash_fx: Option<u64>

Secondary hash fingerprint of intrinsic sizes.

Implementations

impl LayoutCacheKey

pub fn new( area: Rect, constraints: &[Constraint], direction: Direction, intrinsics: Option<&[LayoutSizeHint]>, ) -> Self

Create a new cache key from layout parameters.

Arguments

• area - The available rectangle for layout
• constraints - The constraint list
• direction - Horizontal or Vertical layout
• intrinsics - Optional size hints for FitContent constraints

pub fn area(&self) -> Rect

Reconstruct the area Rect from cached components.

Trait Implementations

impl Clone for LayoutCacheKey

fn clone(&self) -> LayoutCacheKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LayoutCacheKey

impl Debug for LayoutCacheKey

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

Formats the value using the given formatter.

impl Eq for LayoutCacheKey

impl Hash for LayoutCacheKey

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 LayoutCacheKey

fn eq(&self, other: &LayoutCacheKey) -> 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 StructuralPartialEq for LayoutCacheKey