89 lines
3.4 KiB
Swift
89 lines
3.4 KiB
Swift
//
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// ForEach.swift
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// Adwaita
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//
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// Created by david-swift on 30.01.24.
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//
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import CAdw
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import LevenshteinTransformations
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/// A dynamic list but without a list design in the user interface.
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public struct ForEach<Element>: Widget where Element: Identifiable {
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/// The dynamic widget elements.
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var elements: [Element]
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/// The dynamic widget content.
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var content: (Element) -> Body
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/// Whether the list is horizontal.
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var horizontal: Bool
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/// Initialize `ForEach`.
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public init(_ elements: [Element], horizontal: Bool = false, @ViewBuilder content: @escaping (Element) -> Body) {
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self.elements = elements
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self.content = content
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self.horizontal = horizontal
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}
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/// Get the widget's view storage.
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/// - Parameter modifiers: The view modifiers.
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/// - Returns: The view storage.
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public func container(modifiers: [(View) -> View]) -> ViewStorage {
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let storage = ViewStorage(
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gtk_box_new(horizontal ? GTK_ORIENTATION_HORIZONTAL : GTK_ORIENTATION_VERTICAL, 0)?.opaque()
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)
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update(storage, modifiers: modifiers, updateProperties: true)
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return storage
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}
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/// Update the widget's view storage.
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/// - Parameters:
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/// - storage: The view storage.
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/// - modifiers: The view modifiers.
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/// - updateProperties: Whether to update the view's properties.
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public func update(_ storage: ViewStorage, modifiers: [(View) -> View], updateProperties: Bool) {
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var contentStorage: [ViewStorage] = storage.content[.mainContent] ?? []
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let old = storage.fields["element"] as? [Element] ?? []
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let widget: UnsafeMutablePointer<GtkBox>? = storage.pointer?.cast()
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old.identifiableTransform(
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to: elements,
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functions: .init { index, element in
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let child = content(element).widget(modifiers: modifiers).container(modifiers: modifiers)
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gtk_box_remove(widget, contentStorage[safe: index]?.pointer?.cast())
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gtk_box_insert_child_after(
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widget,
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child.pointer?.cast(),
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contentStorage[safe: index - 1]?.pointer?.cast()
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)
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contentStorage.remove(at: index)
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contentStorage.insert(child, at: index)
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} delete: { index in
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gtk_box_remove(widget, contentStorage[safe: index]?.pointer?.cast())
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contentStorage.remove(at: index)
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} insert: { index, element in
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let child = content(element).widget(modifiers: modifiers).container(modifiers: modifiers)
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gtk_box_insert_child_after(
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widget,
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child.pointer?.cast(),
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contentStorage[safe: index - 1]?.pointer?.cast()
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)
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contentStorage.insert(child, at: index)
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}
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)
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if updateProperties {
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gtk_orientable_set_orientation(
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widget?.opaque(),
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horizontal ? GTK_ORIENTATION_HORIZONTAL : GTK_ORIENTATION_VERTICAL
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)
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}
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storage.fields["element"] = elements
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storage.content[.mainContent] = contentStorage
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for (index, element) in elements.enumerated() {
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content(element)
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.widget(modifiers: modifiers)
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.update(contentStorage[index], modifiers: modifiers, updateProperties: updateProperties)
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}
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}
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}
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