78 lines
2.4 KiB
Swift
78 lines
2.4 KiB
Swift
//
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// State.swift
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// Meta
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//
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// Created by david-swift on 26.05.24.
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//
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import Foundation
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/// A property wrapper for properties in a view that should be stored throughout view updates.
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@propertyWrapper
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public struct State<Value>: StateProtocol {
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/// Access the stored value. This updates the views when being changed.
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public var wrappedValue: Value {
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get {
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rawValue
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}
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nonmutating set {
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rawValue = newValue
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StateManager.updateState(id: id)
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StateManager.updateViews(force: forceUpdates)
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}
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}
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/// Get the value as a binding using the `$` prefix.
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public var projectedValue: Binding<Value> {
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.init {
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wrappedValue
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} set: { newValue in
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self.wrappedValue = newValue
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}
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}
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/// Get and set the value without updating the views.
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public var rawValue: Value {
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get {
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guard let value = StateManager.getState(id: id) as? Value else {
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let initialValue = getInitialValue()
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if var model = initialValue as? Model {
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model.model = .init(id: id, force: forceUpdates)
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model.setup()
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StateManager.setState(id: id, value: model)
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StateManager.addConstantID(id)
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} else {
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StateManager.setState(id: id, value: initialValue)
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}
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return initialValue
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}
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return value
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}
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nonmutating set {
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StateManager.setState(id: id, value: newValue)
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}
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}
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/// The state's identifier for the stored value.
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var id: String
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/// Whether to force update the views when the value changes.
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var forceUpdates: Bool
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/// The closure for initializing the state property's value.
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var getInitialValue: () -> Value
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/// Initialize a property representing a state in the view with an autoclosure.
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/// - Parameters:
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/// - wrappedValue: The wrapped value.
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/// - id: An explicit identifier.
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/// - forceUpdates: Whether to force update all available views when the property gets modified.
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public init(wrappedValue: @autoclosure @escaping () -> Value, id: String? = nil, forceUpdates: Bool = false) {
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getInitialValue = wrappedValue
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self.id = id ?? UUID().uuidString
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self.forceUpdates = forceUpdates
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}
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}
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