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# Objective Needing to derive `AnimationEvent` for `Event` is unnecessary, and the trigger logic coupled to it feels like we're coupling "event producer" logic with the event itself, which feels wrong. It also comes with a bunch of complexity, which is again unnecessary. We can have the flexibility of "custom animation event trigger logic" without this coupling and complexity. The current `animation_events` example is also needlessly complicated, due to it needing to work around system ordering issues. The docs describing it are also slightly wrong. We can make this all a non-issue by solving the underlying ordering problem. Related to this, we use the `bevy_animation::Animation` system set to solve PostUpdate animation order-of-operations issues. If we move this to bevy_app as part of our "core schedule", we can cut out needless `bevy_animation` crate dependencies in these instances. ## Solution - Remove `AnimationEvent`, the derive, and all other infrastructure associated with it (such as the `bevy_animation/derive` crate) - Replace all instances of `AnimationEvent` traits with `Event + Clone` - Store and use functions for custom animation trigger logic (ex: `clip.add_event_fn()`). For "normal" cases users dont need to think about this and should use the simpler `clip.add_event()` - Run the `Animation` system set _before_ updating text - Move `bevy_animation::Animation` to `bevy_app::Animation`. Remove unnecessary `bevy_animation` dependency from `bevy_ui` - Adjust `animation_events` example to use the simpler `clip.add_event` API, as the workarounds are no longer necessary This is polishing work that will land in 0.15, and I think it is simple enough and valuable enough to land in 0.15 with it, in the interest of making the feature as compelling as possible. |
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