60 lines
1.7 KiB
Swift
60 lines
1.7 KiB
Swift
//
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// ContentModifier.swift
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// Adwaita
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//
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// Created by david-swift on 11.11.23.
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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>: Widget where Content: View {
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/// The wrapped view.
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var content: View
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/// The closure for the modification.
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var modify: (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 + [modifyView])
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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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/// - updateProperties: Whether to update properties.
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func update(_ storage: ViewStorage, modifiers: [(View) -> View], updateProperties: Bool) {
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content.updateStorage(storage, modifiers: modifiers + [modifyView], updateProperties: updateProperties)
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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: View) -> View {
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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 View {
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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) -> View
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) -> View where Content: View {
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ContentModifier(content: self, modify: modify)
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}
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}
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