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[Merged by Bors] - RemoveChildren command #1925

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[Merged by Bors] - RemoveChildren command #1925

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@alice-i-cecile alice-i-cecile added C-Feature A new feature, making something new possible A-UI Graphical user interfaces, styles, layouts, and widgets core labels Apr 14, 2021
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For posterity, this seems like a nice bit of functionality, and the code quality looks high.

However, parent-child designs in Bevy are due for a rewrite in general: see #1278 for some reasons why and #1627 for one of the most promising directions. I'm not sure if this is correct to merge in the meantime as a result.

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alice-i-cecile approved these changes Jun 25, 2021
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In the interim, I think this should be merged.

@cart cart added this to the Bevy 0.6 milestone Jul 1, 2021
@cart cart added the S-Pre-Relicense This PR was made before Bevy added the Apache license. Cannot be merged or used for other work label Jul 23, 2021
@mockersf mockersf removed the S-Pre-Relicense This PR was made before Bevy added the Apache license. Cannot be merged or used for other work label Jul 24, 2021
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payload reviewed Oct 9, 2021
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crates/bevy_transform/src/hierarchy/child_builder.rs

fn remove_children(&mut self, children: &[Entity]) -> &mut Self {
let parent = self.id();
// SAFE: This doesn't change the parent's location
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I needed to double check when locations change, saw that location changes when a Component is removed and saw that this code removes and inserts components. Next thought was that: child locations change but parent location does not (assuming no child is at the same time the parent).
Could you explain in this comment? // SAFE: This doesn't change the parent's location, only child locations are changed.

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iirc it needs to be unsafe because of &mut self, and world_mut also references the parent. and since it doesn't change its position within the world, it should be fine? but idr it was a long time ago

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Tests are present, look okay. Reviewed unsafe usage, sound.

@alice-i-cecile alice-i-cecile added the S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it label Oct 9, 2021
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cart commented Dec 22, 2021

Just resolved conflicts. Seems useful and the impl is safe.

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cart commented Dec 22, 2021

bors r+

bors bot pushed a commit that referenced this pull request Dec 22, 2021
RemoveChildren command (#1925)
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bors bot commented Dec 22, 2021

Build failed:

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CI failed due to a nightly random ICE, restarting

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bors r+

bors bot pushed a commit that referenced this pull request Dec 23, 2021
RemoveChildren command (#1925)
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bors bot commented Dec 23, 2021

Pull request successfully merged into main.

Build succeeded:

@bors bors bot changed the title RemoveChildren command [Merged by Bors] - RemoveChildren command Dec 23, 2021
@bors bors bot closed this Dec 23, 2021
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A-UI Graphical user interfaces, styles, layouts, and widgets C-Feature A new feature, making something new possible S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it

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