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PreviewLifecycle

screen_app::preview

Enum PreviewLifecycle 

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pub enum PreviewLifecycle {
    Idle,
    Starting,
    Running,
    Stopping,
}
Expand description

Lifecycle state of the camera preview pipeline.

Idle is the resting state. Starting/Stopping are transient states that exist so a re-entrant start_preview call can detect “already booting, drop the new one” instead of double-spawning gst child processes. Running is the steady state.

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Idle

No pipeline running.

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Starting

start_preview invoked but the pipeline isn’t producing frames yet (gst spawn + first-frame latency).

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Running

Pipeline is producing frames.

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Stopping

stop_preview invoked but the gst child is still being torn down. Transient — the click handler should drop into Idle once the child has been reaped.

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impl PreviewLifecycle

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pub fn try_start(self) -> Self

Attempt to advance to Starting. Returns the previous state (so callers can distinguish “started fresh” from “already running, refused”).

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pub fn mark_running(self) -> Self

Mark the pipeline as running (first frame received).

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pub fn try_stop(self) -> Self

Begin teardown — moves Running → Stopping, or stays Idle if no pipeline is up.

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pub fn finish_stop(self) -> Self

Complete teardown — moves Stopping → Idle.

Trait Implementations§

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impl Clone for PreviewLifecycle

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fn clone(&self) -> PreviewLifecycle

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for PreviewLifecycle

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

Formats the value using the given formatter. Read more
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impl Default for PreviewLifecycle

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fn default() -> PreviewLifecycle

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for PreviewLifecycle

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

Deserialize this value from the given Serde deserializer. Read more
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impl PartialEq for PreviewLifecycle

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fn eq(&self, other: &PreviewLifecycle) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Serialize for PreviewLifecycle

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

Serialize this value into the given Serde serializer. Read more
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impl Copy for PreviewLifecycle

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impl Eq for PreviewLifecycle

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impl StructuralPartialEq for PreviewLifecycle

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