60 lines
2.2 KiB
Swift
60 lines
2.2 KiB
Swift
//
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// FlowBox+.swift
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// Adwaita
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//
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// Created by david-swift on 12.02.24.
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//
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import CAdw
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extension FlowBox {
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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 `FlowBox`.
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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 child = g_list_nth_data(gtk_flow_box_get_selected_children(storage.opaquePointer), 0) {
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let element = gtk_flow_box_child_get_child(child.cast())
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return elements[safe: storage.content[.mainContent]?
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.firstIndex { $0.opaquePointer?.cast() == element }]?.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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updateFunctions.append { storage, _, _ in
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storage.connectSignal(name: "selected_children_changed", id: Self.selectionField) {
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if let elements = storage.fields[Self.elementsField] as? [Element],
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let id = id(storage, elements) {
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selection.wrappedValue = id
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}
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}
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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_flow_box_select_child(
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storage.opaquePointer,
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gtk_flow_box_get_child_at_index(storage.opaquePointer, index)
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)
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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_flow_box_set_selection_mode(storage.opaquePointer, GTK_SELECTION_NONE)
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}
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}
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}
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}
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