Struct CheckChangeTicks 

pub struct CheckChangeTicks(/* private fields */);

An Event that can be used to maintain Ticks in custom data structures, enabling to make use of bevy’s periodic checks that clamps ticks to a certain range, preventing overflows and thus keeping methods like Tick::is_newer_than reliably return false for ticks that got too old.

Example

Here a schedule is stored in a custom resource. This way the systems in it would not have their change ticks automatically updated via World::check_change_ticks, possibly causing Tick-related bugs on long-running apps.

To fix that, add an observer for this event that calls the schedule’s Schedule::check_change_ticks.

use bevy_ecs::prelude::*;
use bevy_ecs::change_detection::CheckChangeTicks;

#[derive(Resource)]
struct CustomSchedule(Schedule);

world.add_observer(|check: On<CheckChangeTicks>, mut schedule: ResMut<CustomSchedule>| {
    schedule.0.check_change_ticks(*check);
});

Implementations

impl CheckChangeTicks

pub fn present_tick(self) -> Tick

Get the present Tick that other ticks get compared to.

Trait Implementations

impl Clone for CheckChangeTicks

fn clone(&self) -> CheckChangeTicks

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CheckChangeTicks

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

Formats the value using the given formatter.

impl Event for CheckChangeTicks

where CheckChangeTicks: Send + Sync + 'static,

type Trigger<'a> = GlobalTrigger

Defines which observers will run, what data will be passed to them, and the order they will be run in. See Trigger for more info.

impl Copy for CheckChangeTicks