Detecting entity changes | Bevy | Page 1

mortal escarp Feb 4, 2023, 8:03 AM

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Is there a way to detect the following?

When a component is added to an entity
When a component is removed from an entity
When a component value changes (don't necessarily need the change, just that entity X component Y was modified)
When an entity is created
When an entity is deleted

My use case is the bevy editor. I want to be able to detect when the game changes, and update the UI appropriately. I don't want an immediate mode UI.

brittle rose Feb 4, 2023, 8:16 AM

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Check out the Added<C> and Changed<C> components. For removal, you can use RemovedComponents<C>, though this one has some major limitations

mortal escarp Feb 4, 2023, 8:18 AM

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Does Added work with Entity?

brittle rose Feb 4, 2023, 8:22 AM

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No, I don't think so.

mortal escarp Feb 4, 2023, 8:28 AM

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Hmm. Maybe something I'll have to modify bevy for, then.

brittle rose Feb 4, 2023, 8:52 AM

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someone asked a question specifically about detecting new entities. I think it was this week

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https://discord.com/channels/691052431525675048/1070381686690414613

#Detecting entity changes