67 lines
2.3 KiB
Swift
67 lines
2.3 KiB
Swift
//
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// List.swift
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// Adwaita
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//
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// Created by david-swift on 25.09.23.
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//
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import CAdw
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/// A list box widget.
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public typealias List = ListBox
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extension List {
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/// The ID for the field storing the selection value.
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static var selectionField: String { "selection" }
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/// The ID for the field storing the elements.
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static var elementsField: String { "element" }
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/// Initialize `List`.
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/// - Parameters:
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/// - elements: The elements.
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/// - selection: The identifier of the selected element. Selection disabled if `nil`.
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/// - content: The view for an element.
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public init(
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_ elements: [Element],
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selection: Binding<Element.ID>?,
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@ViewBuilder content: @escaping (Element) -> Body
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) {
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self.init(elements, content: content)
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let id: (ViewStorage, [Element]) -> Element.ID? = { storage, elements in
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if let row = gtk_list_box_get_selected_row(storage.pointer) {
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return elements[safe: .init(gtk_list_box_row_get_index(row))]?.id
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}
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return nil
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}
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if let selection {
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appearFunctions.append { storage in
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storage.fields[Self.selectionField] = selection
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storage.connectSignal(name: "selected_rows_changed", id: Self.selectionField) {
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if let binding = storage.fields[Self.selectionField] as? Binding<Element.ID>,
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let elements = storage.fields[Self.elementsField] as? [Element],
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let id = id(storage, elements) {
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binding.wrappedValue = id
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}
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}
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}
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updateFunctions.append { storage in
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if selection.wrappedValue != id(storage, elements),
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let index = elements.firstIndex(where: { $0.id == selection.wrappedValue })?.cInt {
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gtk_list_box_select_row(storage.pointer, gtk_list_box_get_row_at_index(storage.pointer, index))
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}
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}
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} else {
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appearFunctions.append { storage in
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gtk_list_box_set_selection_mode(storage.pointer, GTK_SELECTION_NONE)
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}
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}
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}
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/// Add the "navigation-sidebar" style class.
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public func sidebarStyle() -> View {
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style("navigation-sidebar")
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}
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}
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