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enable change detection for hierarchy maintenance (#2411)

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# Objective

Noticed a comment saying changed detection should be enabled for hierarchy maintenance once stable

Fixes #891


## Solution

Added `Changed<Parent>` filter on the query
This commit is contained in:
François 2021-09-27 23:32:05 +00:00
parent d158e0893e
commit fb0aa8d286
1 changed files with 2 additions and 3 deletions
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5
crates/bevy_transform/src/hierarchy/hierarchy_maintenance_system.rs
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@ -1,6 +1,7 @@
use crate::components::*;
use bevy_ecs::{
entity::Entity,
prelude::Changed,
query::Without,
system::{Commands, Query},
};
@ -10,9 +11,7 @@ use smallvec::SmallVec;
pub fn parent_update_system(
mut commands: Commands,
removed_parent_query: Query<(Entity, &PreviousParent), Without<Parent>>,
// The next query could be run with a Changed<Parent> filter. However, this would mean that
// modifications later in the frame are lost. See issue 891: https://github.com/bevyengine/bevy/issues/891
mut parent_query: Query<(Entity, &Parent, Option<&mut PreviousParent>)>,
mut parent_query: Query<(Entity, &Parent, Option<&mut PreviousParent>), Changed<Parent>>,
mut children_query: Query<&mut Children>,
) {
// Entities with a missing `Parent` (ie. ones that have a `PreviousParent`), remove