gistfile1.txt

// Odd Manipulation Component Behaviors
struct ImmersiveView: View {

    var body: some View {
        RealityView { content in
            let box1 = ModelEntity(
                mesh: .generateBox(size: 0.5, cornerRadius: 0.01),
                materials: [
                    SimpleMaterial(color: .blue, isMetallic: true)
                ]
            )
            box1.position = .init(x: 0, y: 1.2, z: -1.5)
            box1.name = "box1"
            content.add(box1)
            
            let box2 = ModelEntity(
                mesh: .generateBox(size: 0.5, cornerRadius: 0.01),
                materials: [
                    SimpleMaterial(color: .blue, isMetallic: true)
                ]
            )
            box2.position = .init(x: 1.2, y: 1.2, z: -0.5)
            box2.name = "box2"
            content.add(box2)
            
            // Assigning a Manipulation Component to an entity will trigger SceneEvents.WillRemoveEntity which can't be intended?!
            // Observe the behavior below:
            // Immersive Space is opened -> Entity is added to scene -> ManipulationComponent get's asssigned -> SceneEvents.WillRemoveEntity is called for the entity that got the ManipulationComponent
            
            let _ = content.subscribe(to: SceneEvents.WillRemoveEntity.self) { event in
                print("Will Remove: \(event.entity.name)")
            }
            
            // weirdly this event subscription will be trigger for both of the entites with ManipulationComponent, not just the source entity (box1)
            let _ = content.subscribe(to: ManipulationEvents.WillBegin.self, on: box1) { event in
                print("Manipulation Will Begin: \(event.entity.name)")
            }
            
            ManipulationComponent.configureEntity(box1, allowedInputTypes: .all)
            box1.components.set(ManipulationComponent())
            
            ManipulationComponent.configureEntity(box2, allowedInputTypes: .all)
            box2.components.set(ManipulationComponent())
            print("Set Manipulation component!")
        }
    }
}