104 lines
3.3 KiB
Swift
104 lines
3.3 KiB
Swift
//
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// StateWrapper.swift
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// Meta
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//
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// Created by david-swift on 09.06.24.
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//
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import Observation
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/// A storage for `@State` properties.
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public struct StateWrapper: ConvenienceWidget {
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/// The content.
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var content: () -> Body
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/// The state information (from properties with the `State` wrapper).
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var state: [String: StateProtocol] = [:]
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/// The debug tree parameters.
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public var debugTreeParameters: [(String, value: CustomStringConvertible)] {
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[
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("state", value: state)
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]
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}
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/// The debug tree's content.
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public var debugTreeContent: [(String, body: Body)] {
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[("content", body: content())]
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}
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/// The identifier of the field storing whether to update the wrapper's content.
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private var updateID: String { "update" }
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/// Initialize a `StateWrapper`.
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/// - Parameter content: The view content.
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public init(@ViewBuilder content: @escaping () -> Body) {
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self.content = content
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}
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/// Initialize a `StateWrapper`.
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/// - Parameters:
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/// - content: The view content.
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/// - state: The state information.
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init(content: @escaping () -> Body, state: [String: StateProtocol]) {
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self.content = content
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self.state = state
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}
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/// Update a view storage.
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/// - Parameters:
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/// - storage: The view storage.
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/// - modifiers: Modify views before being updated.
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/// - updateProperties: Whether to update properties.
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/// - type: The type of the widgets.
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public func update<WidgetType>(
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_ storage: ViewStorage,
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modifiers: [(AnyView) -> AnyView],
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updateProperties: Bool,
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type: WidgetType.Type
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) {
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var updateProperties = storage.fields[updateID] as? Bool ?? false
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storage.fields[updateID] = false
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for property in state {
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if let storage = storage.state[property.key]?.content.storage {
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property.value.content.storage = storage
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}
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if property.value.content.storage.update {
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updateProperties = true
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property.value.content.storage.update = false
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}
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}
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if let storage = storage.content[.mainContent]?.first {
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content()
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.widget(modifiers: modifiers)
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.update(storage, modifiers: modifiers, updateProperties: updateProperties, type: type)
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}
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}
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/// Get a view storage.
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/// - Parameters:
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/// - modifiers: Modify views before being updated.
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/// - type: The type of the widgets.
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/// - Returns: The view storage.
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public func container<WidgetType>(modifiers: [(AnyView) -> AnyView], type: WidgetType.Type) -> ViewStorage {
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let content = content().storage(modifiers: modifiers, type: type)
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let storage = ViewStorage(content.pointer, content: [.mainContent: [content]])
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storage.state = state
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observe(storage: storage)
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return storage
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}
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/// Observe the observable properties accessed in the view.
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/// - Parameter storage: The view storage
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func observe(storage: ViewStorage) {
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withObservationTracking {
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_ = content().getDebugTree(parameters: true, type: AnyView.self)
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} onChange: {
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storage.fields[updateID] = true
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UpdateManager.updateViews()
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observe(storage: storage)
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}
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}
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}
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