mirror of
https://github.com/bevyengine/bevy
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19 lines
701 B
Rust
19 lines
701 B
Rust
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//! Tools for debugging states.
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use bevy_ecs::event::EventReader;
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use bevy_state::state::{StateTransitionEvent, States};
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use bevy_utils::tracing::info;
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/// Logs state transitions into console.
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///
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/// This system is provided to make debugging easier by tracking state changes.
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pub fn log_transitions<S: States>(mut transitions: EventReader<StateTransitionEvent<S>>) {
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// State internals can generate at most one event (of type) per frame.
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let Some(transition) = transitions.read().last() else {
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return;
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};
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let name = std::any::type_name::<S>();
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let StateTransitionEvent { exited, entered } = transition;
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info!("{} transition: {:?} => {:?}", name, exited, entered);
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}
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