Struct bevy_ecs::query::ChangeTrackers
source · [−]pub struct ChangeTrackers<T: Component> { /* private fields */ }
Expand description
WorldQuery
that tracks changes and additions for component T
.
Wraps a Component
to track whether the component changed for the corresponding entities in
a query since the last time the system that includes these queries ran.
If you only care about entities that changed or that got added use the
Changed
and Added
filters instead.
Examples
fn print_moving_objects_system(query: Query<(&Name, ChangeTrackers<Transform>)>) {
for (name, tracker) in query.iter() {
if tracker.is_changed() {
println!("Entity moved: {:?}", name);
} else {
println!("Entity stood still: {:?}", name);
}
}
}
Implementations
sourceimpl<T: Component> ChangeTrackers<T>
impl<T: Component> ChangeTrackers<T>
Trait Implementations
sourceimpl<T: Clone + Component> Clone for ChangeTrackers<T>
impl<T: Clone + Component> Clone for ChangeTrackers<T>
sourcefn clone(&self) -> ChangeTrackers<T>
fn clone(&self) -> ChangeTrackers<T>
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl<T: Component> Debug for ChangeTrackers<T>
impl<T: Component> Debug for ChangeTrackers<T>
sourceimpl<T: Component> WorldQuery for ChangeTrackers<T>
impl<T: Component> WorldQuery for ChangeTrackers<T>
type Fetch = ChangeTrackersFetch<T>
type State = ChangeTrackersState<T>
type ReadOnlyFetch = ChangeTrackersFetch<T>
Auto Trait Implementations
impl<T> RefUnwindSafe for ChangeTrackers<T> where
T: RefUnwindSafe,
impl<T> Send for ChangeTrackers<T>
impl<T> Sync for ChangeTrackers<T>
impl<T> Unpin for ChangeTrackers<T> where
T: Unpin,
impl<T> UnwindSafe for ChangeTrackers<T> where
T: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcepub fn borrow_mut(&mut self) -> &mut T
pub fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Downcast for T where
T: Any,
impl<T> Downcast for T where
T: Any,
sourcepub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>
pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
sourcepub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
sourcepub fn as_any(&self) -> &(dyn Any + 'static)
pub fn as_any(&self) -> &(dyn Any + 'static)
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
sourcepub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
sourceimpl<T> DowncastSync for T where
T: Any + Send + Sync,
impl<T> DowncastSync for T where
T: Any + Send + Sync,
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
sourcefn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcepub fn to_owned(&self) -> T
pub fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
sourcepub fn clone_into(&self, target: &mut T)
pub fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more
sourceimpl<T> TypeData for T where
T: 'static + Send + Sync + Clone,
impl<T> TypeData for T where
T: 'static + Send + Sync + Clone,
pub fn clone_type_data(&self) -> Box<dyn TypeData + 'static, Global>
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more