GhostNode trait
#17901
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GhostNode trait
#17901
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Give every entity in the UI hierarchy a `UiElement` marker component and, if the "ghost_nodes" feature is enabled, implement the `Ghost` trait for `UiElement`
* `Ghost` to `GhostNode` * `UiElement` to `UiNode` * `Ghost::Completion` to `GhostNode::Actual` Both system param impl changes: * `iter_ui_children` to `iter_actual_actual_children` * `is_ui_node` to `is_actual_node` The `experimental` module now only contains the `GhostNode` trait and it's implementation. It works with any hierarchy now, not just UI nodes. The "ghost_nodes" feature gate and UI specfic navigation implementation has been moved to a new `navigation` module.
…nto ghostnode-trait
ickshonpe
added
A-UI
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Objective
Replace the UI's ghost node implementation with a trait that can be used with any hierarchy, not just UI
Nodes.Solution
Make
GhostNodeinto a trait with anActualassociated type.GhostNodeshould be implemented on a marker component that must be inserted on every entity in the collapsible hierarchy.The flattened view of the hierarchy sees only those nodes with an
Actualcomponent.The UI specfic parts of the old ghost nodes implementation and the feature gate have been moved to a new module named
navigation.The marker component that implements
GhostNodeis calledUiNodeand the associatedActualtype isNode.NoderequiresUiNode.The navigation
SystemParams are mostly unchanged except for some renamings:iter_ui_children->iter_actual_childrenis_ui_node->is_actualMigration Guide