bevyeventset

A macro to create event bundles for Bevy

Standard practice in Bevy currently is declaring events as an enum. This is fine for many use cases, but in some situations you want to be able to listen for individual events in your systems while still being able to easily send multiple types of events (e.g. when parsing user input).

With the event_set macro, you can create an event set that allows you to send multiple event types.

Setup

A bug in a subcrate of Bevy 0.4 prevents this crate from working properly. Add the following patch to your Cargo.toml to apply the fix:

toml [patch.crates-io] bevy_ecs_macros = { git = "https://github.com/woubuc/bevy", branch = "fix/ecs-macro-systemparam-0.4" }

This bug is fixed in Bevy with PR #1434.

Usage

```rust use bevy::prelude::; use bevy_event_set::;

// Define your events struct EventOne; struct EventTwo; struct EventThree(usize);

// Create an event set named MyEvents event_set!(MyEvents { EventOne, EventTwo, EventThree });

// Use the event set in a system fn eventemittersystem(mut events: MyEvents) { events.send(EventOne); events.send(EventTwo); events.send(EventThree(42)); }

// Subscribe to events selectively in different systems fn eventonelistenersystem(events: Res>) { } fn eventtwolistenersystem(events: Res>) { } fn eventthreelistener_system(events: Res>) { } ```