Viktor Gustavsson f86ee32576 Add UI GhostNode (#15341) ... # Objective - Fixes #14826 - For context, see #15238 ## Solution Add a `GhostNode` component to `bevy_ui` and update all the relevant systems to use it to traverse for UI children. - [x] `ghost_hierarchy` module - [x] Add `GhostNode` - [x] Add `UiRootNodes` system param for iterating (ghost-aware) UI root nodes - [x] Add `UiChildren` system param for iterating (ghost-aware) UI children - [x] Update `layout::ui_layout_system` - [x] Use ghost-aware root nodes for camera updates - [x] Update and remove children in taffy - [x] Initial spawn - [x] Detect changes on nested UI children - [x] Use ghost-aware children traversal in `update_uinode_geometry_recursive` - [x] Update the rest of the UI systems to use the ghost hierarchy - [x] `stack::ui_stack_system` - [x] `update::` - [x] `update_clipping_system` - [x] `update_target_camera_system` - [x] `accessibility::calc_name` ## Testing - [x] Added a new example `ghost_nodes` that can be used as a testbed. - [x] Added unit tests for _some_ of the traversal utilities in `ghost_hierarchy` - [x] Ensure this fulfills the needs for currently known use cases - [x] Reactivity libraries (test with `bevy_reactor`) - [ ] Text spans (mentioned by koe [on discord](https://discord.com/channels/691052431525675048/1285371432460881991/1285377442998915246)) --- ## Performance [See comment below](https://github.com/bevyengine/bevy/pull/15341#issuecomment-2385456820) ## Migration guide Any code that previously relied on `Parent`/`Children` to iterate UI children may now want to use `bevy_ui::UiChildren` to ensure ghost nodes are skipped, and their first descendant Nodes included. UI root nodes may now be children of ghost nodes, which means `Without<Parent>` might not query all root nodes. Use `bevy_ui::UiRootNodes` where needed to iterate root nodes instead. ## Potential future work - Benchmarking/optimizations of hierarchies containing lots of ghost nodes - Further exploration of UI hierarchies and markers for root nodes/leaf nodes to create better ergonomics for things like `UiLayer` (world-space ui) --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> Co-authored-by: UkoeHB <37489173+UkoeHB@users.noreply.github.com>		2024-10-02 00:24:28 +00:00
..
bevy_a11y	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_animation	Migrate scenes to required components (#15579)	2024-10-01 22:42:11 +00:00
bevy_app	Runtime required components (#15458)	2024-09-30 19:20:16 +00:00
bevy_asset	bevy_asset: Improve NestedLoader API (#15509)	2024-10-01 14:14:04 +00:00
bevy_audio	Migrate audio to required components (#15573)	2024-10-01 22:43:29 +00:00
bevy_color	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_core	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_core_pipeline	Migrate motion blur, TAA, SSAO, and SSR to required components (#15572)	2024-10-01 22:45:31 +00:00
bevy_derive	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_dev_tools	Simplified ui_stack_system (#9889)	2024-09-30 18:43:57 +00:00
bevy_diagnostic	Runtime required components (#15458)	2024-09-30 19:20:16 +00:00
bevy_dylib	Generate links to definition in source code pages on docs.rs and dev-docs.bevyengine.org (#12965)	2024-07-29 23:10:16 +00:00
bevy_ecs	Make SystemIdMarker reflect-able (#15556)	2024-10-01 22:46:44 +00:00
bevy_encase_derive	Update `glam to 0.29, encase` to 0.10. (#15249)	2024-09-23 19:44:02 +00:00
bevy_gilrs	Implement gamepads as entities (#12770)	2024-09-27 20:07:20 +00:00
bevy_gizmos	The Cooler 'Retain Rendering World' (#15320)	2024-09-30 18:51:43 +00:00
bevy_gltf	Migrate scenes to required components (#15579)	2024-10-01 22:42:11 +00:00
bevy_hierarchy	Add VisitEntities for generic and reflectable Entity iteration (#15425)	2024-09-30 17:32:03 +00:00
bevy_input	Fix window spawning triggering ButtonInput<KeyCode>::just_pressed/just_released (#12372)	2024-09-30 18:24:36 +00:00
bevy_internal	Add features to switch NativeActivity and GameActivity usage (#12095)	2024-10-01 22:23:48 +00:00
bevy_log	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_macro_utils	Modify derive_label to support no_std environments (#15465)	2024-09-27 20:23:26 +00:00
bevy_math	Curve-based animation (#15434)	2024-09-30 19:56:55 +00:00
bevy_mikktspace	Add no_std support to bevy_mikktspace (#15528)	2024-09-30 18:17:03 +00:00
bevy_pbr	Migrate motion blur, TAA, SSAO, and SSR to required components (#15572)	2024-10-01 22:45:31 +00:00
bevy_picking	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_ptr	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_reflect	bevy_reflect: Generic parameter info (#15475)	2024-09-30 17:58:37 +00:00
bevy_remote	Add content-type header to BRP HTTP responses (#15552)	2024-09-30 21:23:55 +00:00
bevy_render	Migrate meshes and materials to required components (#15524)	2024-10-01 21:33:17 +00:00
bevy_scene	Migrate scenes to required components (#15579)	2024-10-01 22:42:11 +00:00
bevy_sprite	Migrate meshes and materials to required components (#15524)	2024-10-01 21:33:17 +00:00
bevy_state	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_tasks	bump async-channel to 2.3.0 (#15497)	2024-09-28 19:21:59 +00:00
bevy_text	Refactor TextPipeline::update_buffer to accept an interator (#15581)	2024-10-01 23:44:59 +00:00
bevy_time	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_transform	Migrate visibility to required components (#15474)	2024-09-27 19:06:16 +00:00
bevy_ui	Add UI GhostNode (#15341)	2024-10-02 00:24:28 +00:00
bevy_utils	Add core and alloc over std Lints (#15281)	2024-09-27 00:59:59 +00:00
bevy_window	Add VisitEntities for generic and reflectable Entity iteration (#15425)	2024-09-30 17:32:03 +00:00
bevy_winit	Add features to switch NativeActivity and GameActivity usage (#12095)	2024-10-01 22:23:48 +00:00