Struct FixtureTransport 

pub struct FixtureTransport { /* private fields */ }

A transport that plays nothing, on purpose.

It holds a snapshot the caller wrote and moves it only when a command asks it to: no clock runs, so the same scene renders the same pixels on every machine and in any order, which is what the visual gate needs. It records every command so a test can assert what a control asked for.

It reports MediaOrigin::Fixture, and every surface in this module publishes and draws that, so a fixture on screen is never mistaken for a player.

Implementations

impl FixtureTransport

pub fn new() -> Self

A fixture holding nothing, which is MediaAvailability::Idle.

pub fn ready(duration: f32) -> Self

A fixture that holds media of a known length and is ready to move it.

pub fn live() -> Self

A fixture standing in for a live stream: ready, and no total.

pub fn state(self, state: TransportState) -> Self

pub fn position(self, seconds: f32) -> Self

Where the head stands. It stays there: nothing here advances it.

pub fn volume(self, volume: f32) -> Self

pub fn muted(self, muted: bool) -> Self

pub fn speed(self, speed: f32) -> Self

pub fn buffered(self, ranges: impl IntoIterator<Item = BufferedRange>) -> Self

pub fn loading(self) -> Self

pub fn no_backend(self, reason: impl Into<SharedString>) -> Self

Stands in for a machine with no backend that can play this.

pub fn failed(self, reason: impl Into<SharedString>) -> Self

Stands in for media that was opened and could not be read.

pub fn refusing(self, reason: impl Into<SharedString>) -> Self

Makes every command answer MediaOutcome::Refused, which is how a test proves a refused control changes nothing on screen.

pub fn unsupported( self, commands: impl IntoIterator<Item = &'static str>, ) -> Self

Names commands this fixture does not implement, by MediaCommand::name.

pub fn commands(&self) -> Vec<MediaCommand>

Every command asked of it, in order.

pub fn shared(self) -> Rc<dyn MediaTransport>

The fixture as a surface takes it.

Trait Implementations

impl Debug for FixtureTransport

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

Formats the value using the given formatter.

impl Default for FixtureTransport

fn default() -> Self

Returns the “default value” for a type.

impl MediaTransport for FixtureTransport

fn origin(&self) -> MediaOrigin

Whether these facts come from a real player or from a fixture.

fn snapshot(&self) -> MediaSnapshot

What is true now. Called once per frame; it must not block.

fn apply(&self, command: MediaCommand) -> MediaOutcome

Asks for a change, and answers what became of the request.