pub struct DirectionalNavigation<'w> {
pub focus: ResMut<'w, InputFocus>,
pub map: Res<'w, DirectionalNavigationMap>,
}
Expand description
A system parameter for navigating between focusable entities in a directional way.
Fields§
§focus: ResMut<'w, InputFocus>
The currently focused entity.
map: Res<'w, DirectionalNavigationMap>
The navigation map containing the connections between entities.
Implementations§
Navigates to the neighbor in a given direction from the current focus, if any.
Returns the new focus if successful. Returns an error if there is no focus set or if there is no neighbor in the requested direction.
If the result was Ok
, the InputFocus
resource is updated to the new focus as part of this method call.
Trait Implementations§
Source§type Item<'w, 's> = DirectionalNavigation<'w>
type Item<'w, 's> = DirectionalNavigation<'w>
The item type returned when constructing this system param.
The value of this associated type should be
Self
, instantiated with new lifetimes. Read moreSource§fn init_access(
state: &Self::State,
system_meta: &mut SystemMeta,
component_access_set: &mut FilteredAccessSet,
world: &mut World,
)
fn init_access( state: &Self::State, system_meta: &mut SystemMeta, component_access_set: &mut FilteredAccessSet, world: &mut World, )
Registers any
World
access used by this SystemParam
Source§fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)
fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)
Applies any deferred mutations stored in this
SystemParam
’s state.
This is used to apply Commands
during ApplyDeferred
.Source§fn queue(
state: &mut Self::State,
system_meta: &SystemMeta,
world: DeferredWorld<'_>,
)
fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_>, )
Queues any deferred mutations to be applied at the next
ApplyDeferred
.Source§unsafe fn validate_param<'w, 's>(
state: &'s mut Self::State,
_system_meta: &SystemMeta,
_world: UnsafeWorldCell<'w>,
) -> Result<(), SystemParamValidationError>
unsafe fn validate_param<'w, 's>( state: &'s mut Self::State, _system_meta: &SystemMeta, _world: UnsafeWorldCell<'w>, ) -> Result<(), SystemParamValidationError>
Source§unsafe fn get_param<'w, 's>(
state: &'s mut Self::State,
system_meta: &SystemMeta,
world: UnsafeWorldCell<'w>,
change_tick: Tick,
) -> Self::Item<'w, 's>
unsafe fn get_param<'w, 's>( state: &'s mut Self::State, system_meta: &SystemMeta, world: UnsafeWorldCell<'w>, change_tick: Tick, ) -> Self::Item<'w, 's>
Creates a parameter to be passed into a
SystemParamFunction
. Read moreAuto Trait Implementations§
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
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fn borrow_mut(&mut self) -> &mut T
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T: Any,
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) to &Any
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’s vtable from &Trait
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T: ?Sized,
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fn into_either(self, into_left: bool) -> Either<Self, Self>
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Source§fn into_result(self) -> Result<T, RunSystemError>
fn into_result(self) -> Result<T, RunSystemError>
Converts this type into the system output type.