54 lines
1.5 KiB
Swift
54 lines
1.5 KiB
Swift
//
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// AppearObserver.swift
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// Adwaita
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//
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// Created by david-swift on 29.11.23.
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//
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import Libadwaita
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/// A widget which executes a custom code when being rendered for the first time.
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struct AppearObserver: Widget {
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/// The function.
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var onAppear: (NativeWidgetPeer) -> Void
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/// The content.
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var content: View
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/// Get the content's container.
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/// - Parameter modifiers: Modify views before being updated.
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/// - Returns: The content's container.
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func container(modifiers: [(View) -> View]) -> ViewStorage {
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let storage = content.storage(modifiers: modifiers)
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onAppear(storage.view)
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return storage
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}
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/// Update the content.
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/// - Parameters:
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/// - storage: The content's storage.
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/// - modifiers: Modify views before being updated.
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func update(_ storage: ViewStorage, modifiers: [(View) -> View]) {
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content.updateStorage(storage, modifiers: modifiers)
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}
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}
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extension View {
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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 (NativeWidgetPeer) -> Void) -> View {
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AppearObserver(onAppear: 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) -> View {
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inspectOnAppear { _ in closure() }
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}
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}
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