david-swift
1c50b3b923
Make one @State always reference the same value This is important when views with closures appear after the first render
57 lines
1.8 KiB
Swift
57 lines
1.8 KiB
Swift
//
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// StateWrapper.swift
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// Adwaita
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//
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// Created by david-swift on 26.09.23.
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//
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import Libadwaita
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/// A storage for `@State` properties.
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public struct StateWrapper: Widget {
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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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/// 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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public func update(_ storage: ViewStorage, modifiers: [(View) -> View]) {
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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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}
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if let storage = storage.content[.mainContent]?.first {
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content().widget(modifiers: modifiers).update(storage, modifiers: modifiers)
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}
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}
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/// Get a view storage.
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/// - Parameter modifiers: Modify views before being updated.
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/// - Returns: The view storage.
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public func container(modifiers: [(View) -> View]) -> ViewStorage {
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let content = content().widget(modifiers: modifiers).container(modifiers: modifiers)
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return .init(content.view, content: [.mainContent: [content]], state: state)
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}
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}
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