31 lines
1.1 KiB
Rust
31 lines
1.1 KiB
Rust
use bevy_ecs::{system::Commands, world::World};
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use log::debug;
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use crate::state::{FreelyMutableState, NextState};
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/// Extension trait for [`Commands`] adding `bevy_state` helpers.
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pub trait CommandsStatesExt {
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/// Sets the next state the app should move to.
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///
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/// Internally this schedules a command that updates the [`NextState<S>`](crate::prelude::NextState)
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/// resource with `state`.
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///
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/// Note that commands introduce sync points to the ECS schedule, so modifying `NextState`
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/// directly may be more efficient depending on your use-case.
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fn set_state<S: FreelyMutableState>(&mut self, state: S);
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}
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impl CommandsStatesExt for Commands<'_, '_> {
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fn set_state<S: FreelyMutableState>(&mut self, state: S) {
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self.queue(move |w: &mut World| {
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let mut next = w.resource_mut::<NextState<S>>();
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if let NextState::Pending(prev) = &*next {
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if *prev != state {
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debug!("overwriting next state {prev:?} with {state:?}");
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}
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}
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next.set(state);
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});
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}
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}
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