133 lines
3.6 KiB
Swift
133 lines
3.6 KiB
Swift
//
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// ViewStorage.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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/// Store a reference to a rendered view in a view storage.
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public actor ViewStorage: Sendable {
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/// The pointer.
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///
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/// It can be a C pointer, a Swift class, or other information depending on the backend.
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public var pointer: Sendable?
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/// The view's content for container widgets.
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var content: [String: [ViewStorage]]
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/// The view's state (used in `StateWrapper`).
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var state: [String: StateProtocol] = [:]
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/// Various properties of a widget.
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var fields: [String: Sendable] = [:]
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/// The previous state of the widget.
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public var previousState: Widget?
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/// The pointer as an opaque pointer, as this is needed with backends interoperating with C or C++.
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public var opaquePointer: OpaquePointer? {
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get {
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pointer as? OpaquePointer
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}
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set {
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pointer = newValue
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}
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}
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/// Initialize a view storage.
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/// - Parameters:
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/// - pointer: The pointer to the widget, its type depends on the backend.
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/// - content: The view's content for container widgets.
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public init(
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_ pointer: Sendable?,
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content: [String: [ViewStorage]] = [:],
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state: Widget? = nil
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) {
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self.pointer = pointer
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self.content = content
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self.previousState = state
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}
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/// Initialize a view storage.
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/// - Parameters:
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/// - pointer: The opaque pointer.
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/// - content: The view's content for container widgets.
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public init(
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_ pointer: OpaquePointer?,
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content: [String: [ViewStorage]] = [:],
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state: Widget? = nil
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) {
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self.pointer = pointer
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self.content = content
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self.previousState = state
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}
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/// Set the state under a certain key.
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/// - Parameters:
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/// - key: The key.
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/// - value: The state.
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func setState(key: String, value: StateProtocol) {
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state[key] = value
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}
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/// Set the state.
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/// - Parameter state: The state.
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func setState(_ state: [String: StateProtocol]) {
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self.state = state
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}
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/// Get the state under a certain key.
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/// - Parameter key: The key.
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/// - Returns: The state.
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func getState(key: String) -> StateProtocol? {
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state[key]
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}
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/// Set the pointer.
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/// - Parameter value: The new pointer.
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public func setPointer(_ value: Sendable?) {
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pointer = value
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}
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/// Set the element of a certain field.
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/// - Parameters:
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/// - key: The key.
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/// - value: The field.
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public func setField(key: String, value: Sendable) {
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fields[key] = value
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}
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/// Remove a certain field.
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/// - Parameters:
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/// - key: The key.
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public func removeField(key: String) {
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fields.removeValue(forKey: key)
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}
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/// Get the element of a certain field.
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/// - Parameter key: The key.
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/// - Returns: The field.
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public func getField(key: String) -> Sendable? {
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fields[key]
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}
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/// Set the content elements under a certain key.
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/// - Parameters:
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/// - key: The key.
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/// - value: The content elements.
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public func setContent(key: String, value: [ViewStorage]) {
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content[key] = value
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}
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/// Get the content elements under a certain key.
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/// - Parameter key: The key.
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/// - Returns: The content elements.
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public func getContent(key: String) -> [ViewStorage] {
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content[key] ?? []
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}
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/// Set the previous state.
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/// - Parameter state: The state.
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public func setPreviousState(_ state: Widget?) {
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previousState = state
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}
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}
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