79 lines
2.1 KiB
Swift
79 lines
2.1 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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content.storage.update = true
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UpdateManager.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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// swiftlint:disable force_cast
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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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content.storage.value as! Value
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}
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nonmutating set {
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content.storage.value = newValue
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writeValue?(newValue)
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}
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}
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// swiftlint:enable force_cast
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/// The stored value.
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let content: StateContent
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/// Whether to force update the views when the value changes.
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public var forceUpdates: Bool
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/// The function for updating the value in the settings file.
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private var writeValue: ((Value) -> Void)?
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/// The value with an erased type.
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public var value: Any {
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get {
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wrappedValue
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}
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nonmutating set {
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if let newValue = newValue as? Value {
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content.storage.value = newValue
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}
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}
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}
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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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/// - forceUpdates: Whether to force update all available views when the property gets modified.
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public init(wrappedValue: @autoclosure @escaping () -> Value, forceUpdates: Bool = false) {
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content = .init(getInitialValue: wrappedValue)
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self.forceUpdates = forceUpdates
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}
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}
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