65 lines
1.9 KiB
Swift
65 lines
1.9 KiB
Swift
//
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// AppearObserver.swift
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// Meta
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//
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// Created by david-swift on 29.06.24.
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//
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/// Run a custom code accessing the view's storage when initializing the view.
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struct AppearObserver: ConvenienceWidget {
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/// The custom code to edit the widget.
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var modify: (ViewStorage) -> Void
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/// The wrapped view.
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var content: AnyView
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/// The view storage.
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/// - Parameters:
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/// - data: Modify views before being updated.
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/// - type: The view render data type.
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/// - Returns: The view storage.
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func container<Data>(
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data: WidgetData,
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type: Data.Type
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) -> ViewStorage where Data: ViewRenderData {
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let storage = content.storage(data: data, type: type)
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modify(storage)
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return storage
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}
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/// Update the stored content.
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/// - Parameters:
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/// - storage: The storage to update.
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/// - data: Modify views before being updated
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/// - updateProperties: Whether to update the view's properties.
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/// - type: The view render data type.
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func update<Data>(
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_ storage: ViewStorage,
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data: WidgetData,
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updateProperties: Bool,
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type: Data.Type
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) where Data: ViewRenderData {
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content.updateStorage(storage, data: data, updateProperties: updateProperties, type: type)
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}
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}
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/// Extend any view.
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extension AnyView {
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/// Run a function on the widget when it appears for the first time.
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/// - Parameter closure: The function.
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/// - Returns: A view.
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public func inspectOnAppear(_ closure: @escaping (ViewStorage) -> Void) -> AnyView {
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AppearObserver(modify: closure, content: self)
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}
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/// Run a function when the view appears for the first time.
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/// - Parameter closure: The function.
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/// - Returns: A view.
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public func onAppear(_ closure: @escaping () -> Void) -> AnyView {
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inspectOnAppear { _ in closure() }
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}
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}
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