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- /// The children of a view graph node. This is implemented by a few different
- /// types for various purposes. E.g. variable length with same-typed elements
- /// (``ForEach``), and fixed length with distinctly-typed elements (``TupleView1``,
- /// ``TupleView2``, etc).
- @MainActor
- public protocol ViewGraphNodeChildren {
- /// The widget of the children. Type-erased to avoid the type of the currently
- /// selected backend leaking into the ``View`` protocol, requiring users to
- /// engage with annoying complexity and reducing ease of backend switching.
- var widgets: [AnyWidget] { get }
- /// Erased representations of all contained child nodes.
- var erasedNodes: [ErasedViewGraphNode] { get }
- }
- extension ViewGraphNodeChildren {
- /// Gets the node's type-erased widgets for a specific backend (crashing if the
- /// widgets were created by a different backend).
- public func widgets<Backend: BaseAppBackend>(for backend: Backend) -> [Backend.Widget] {
- return widgets.map { $0.into() }
- }
- }
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