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Remove Changed from parent update system (#907)

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System has to check for actual change of the value anyway. This way,
children inserted after postupdate get synced in the next frame and are
not lost.
This commit is contained in:
SvenTS 2020-11-26 02:33:59 +01:00 committed by GitHub
parent fd6b787efc
commit de5ff0aa5a
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1 changed files with 5 additions and 6 deletions
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11
crates/bevy_transform/src/hierarchy/hierarchy_maintenance_system.rs
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@ -1,15 +1,14 @@
use crate::components::*;
use bevy_ecs::{Changed, Commands, Entity, Query, Without};
use bevy_ecs::{Commands, Entity, Query, Without};
use bevy_utils::HashMap;
use smallvec::SmallVec;
pub fn parent_update_system(
commands: &mut Commands,
removed_parent_query: Query<(Entity, &PreviousParent), Without<Parent>>,
mut changed_parent_query: Query<
(Entity, &Parent, Option<&mut PreviousParent>),
Changed<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 children_query: Query<&mut Children>,
) {
// Entities with a missing `Parent` (ie. ones that have a `PreviousParent`), remove
@ -25,7 +24,7 @@ pub fn parent_update_system(
let mut children_additions = HashMap::<Entity, SmallVec<[Entity; 8]>>::default();
// Entities with a changed Parent (that also have a PreviousParent, even if None)
for (entity, parent, possible_previous_parent) in changed_parent_query.iter_mut() {
for (entity, parent, possible_previous_parent) in parent_query.iter_mut() {
if let Some(mut previous_parent) = possible_previous_parent {
// New and previous point to the same Entity, carry on, nothing to see here.
if previous_parent.0 == parent.0 {