70 lines
2.0 KiB
Swift
70 lines
2.0 KiB
Swift
//
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// ContentModifier.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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/// A widget which replaces views of a specific type in its content.
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struct ContentModifier<Content>: ConvenienceWidget where Content: AnyView {
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/// The wrapped view.
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var content: AnyView
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/// The closure for the modification.
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var modify: (Content) -> AnyView
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/// The view storage.
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/// - Parameters:
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/// - modifiers: Modify views before being updated.
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/// - type: The type of the app storage.
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func container<Storage>(
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modifiers: [(any AnyView) -> any AnyView],
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type: Storage.Type
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) -> ViewStorage where Storage: AppStorage {
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content.storage(modifiers: modifiers + [modifyView], type: type)
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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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/// - modifiers: Modify views before being updated
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/// - updateProperties: Whether to update the view's properties.
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/// - type: The type of the app storage.
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func update<Storage>(
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_ storage: ViewStorage,
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modifiers: [(any AnyView) -> any AnyView],
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updateProperties: Bool,
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type: Storage.Type
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) where Storage: AppStorage {
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content
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.updateStorage(storage, modifiers: modifiers + [modifyView], updateProperties: updateProperties, type: type)
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}
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/// Apply the modifier to a view.
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/// - Parameter view: The view.
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func modifyView(_ view: AnyView) -> AnyView {
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if let view = view as? Content {
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return modify(view).stopModifiers()
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} else {
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return view
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}
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}
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}
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extension AnyView {
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/// Replace every occurrence of a certain view type in the content.
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/// - Parameters:
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/// - type: The view type.
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/// - modify: Modify the view.
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/// - Returns: A view.
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public func modifyContent<Content>(
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_ type: Content.Type,
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modify: @escaping (Content) -> AnyView
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) -> AnyView where Content: AnyView {
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ContentModifier(content: self, modify: modify)
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}
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}
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