3dc6a07d27
# Objective add functionality to allow propagating components to children. requested originally for `RenderLayers` but can be useful more generally. ## Solution - add `HierarchyPropagatePlugin<C, F=()>` which schedules systems to propagate components through entities matching `F` - add `Propagate<C: Component + Clone + PartialEq>` which will cause `C` to be added to all children more niche features: - add `PropagateStop<C>` which stops the propagation at this entity - add `PropagateOver<C>` which allows the propagation to continue to children, but doesn't add/remove/modify a `C` on this entity itself ## Testing see tests inline ## Notes - could happily be an out-of-repo plugin - not sure where it lives: ideally it would be in `bevy_ecs` but it requires a `Plugin` so I put it in `bevy_app`, doesn't really belong there though. - i'm not totally up-to-date on triggers and observers so possibly this could be done more cleanly, would be very happy to take review comments - perf: this is pretty cheap except for `update_reparented` which has to check the parent of every moved entity. since the entirety is opt-in i think it's acceptable but i could possibly use `(Changed<Children>, With<Inherited<C>>)` instead if it's a concern |
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| .. | ||
| app.rs | ||
| hotpatch.rs | ||
| lib.rs | ||
| main_schedule.rs | ||
| panic_handler.rs | ||
| plugin_group.rs | ||
| plugin.rs | ||
| propagate.rs | ||
| schedule_runner.rs | ||
| sub_app.rs | ||
| task_pool_plugin.rs | ||
| terminal_ctrl_c_handler.rs | ||