Struct MeasureRequests 

pub struct MeasureRequests { /* private fields */ }

A set of questions for one call, built up and then asked at once.

Reused across frames: clearing keeps every buffer’s capacity, so once warm, asking the same number of questions allocates nothing.

Implementations

impl MeasureRequests

pub fn new() -> Self

pub fn set_zoom(&mut self, zoom: f32)

Measures the requests asked from here on at zoom zoom: the zoom of the page region they belong to, which is the operating system’s text size times the application’s own zoom. The Renderer measures them at its density times zoom, with no font scale of its own, and answers in the region’s CSS pixels.

A Host can hold several regions at different zooms, which is why this travels with every request rather than being the Renderer’s state. Never set, it is one.

pub fn clear(&mut self)

Forgets every question, keeping the room they took.

pub fn len(&self) -> usize

How many questions there are.

pub fn is_empty(&self) -> bool

pub fn text( &mut self, text: &str, spans: &TextSpans, style: &TextStyle, constraint: TextConstraint, ) -> usize

Asks how big text, with spans laid over it and set in style, is under constraint. Returns the index its answer will have.

pub fn node(&mut self, node_id: u32, constraints: NodeConstraints) -> usize

Asks how big the node node_id, which the Renderer has already applied, is under constraints. Returns the index its answer will have.

pub fn encoded(&mut self) -> &[u8]

The buffer these requests are sent as: the records, then the payload, every offset counted from its start.

Trait Implementations

impl Debug for MeasureRequests

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

Formats the value using the given formatter.

impl Default for MeasureRequests

fn default() -> Self

Returns the “default value” for a type.