Struct LayoutContext 

pub struct LayoutContext {
    pub measured_node_sizes: BTreeMap<NodeId, CanvasSize>,
    pub pinned_nodes: BTreeSet<NodeId>,
    pub node_origin: Option<(f32, f32)>,
}

Runtime or host-owned context available to layout engines.

Fields

measured_node_sizes: BTreeMap<NodeId, CanvasSize>

Runtime-reported node sizes. Graph node sizes and request-local measured sizes win.

pinned_nodes: BTreeSet<NodeId>

Nodes that engines should treat as fixed when they support pinning.

node_origin: Option<(f32, f32)>

Runtime fallback node origin, usually resolved from interaction state.

Implementations

impl LayoutContext

pub fn new() -> LayoutContext

Creates an empty layout context.

pub fn with_measured_node_sizes( self, sizes: impl IntoIterator<Item = (NodeId, CanvasSize)>, ) -> LayoutContext

Adds runtime-reported node sizes.

pub fn with_pinned_nodes( self, nodes: impl IntoIterator<Item = NodeId>, ) -> LayoutContext

Adds nodes that engines should keep fixed when possible.

pub fn with_node_origin(self, node_origin: (f32, f32)) -> LayoutContext

Sets the runtime fallback node origin.

Trait Implementations

impl Clone for LayoutContext

fn clone(&self) -> LayoutContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayoutContext

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

Formats the value using the given formatter.

impl Default for LayoutContext

fn default() -> LayoutContext

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for LayoutContext

fn deserialize<__D>( __deserializer: __D, ) -> Result<LayoutContext, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for LayoutContext

fn eq(&self, other: &LayoutContext) -> 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 Serialize for LayoutContext

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for LayoutContext