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@@ -0,0 +1,207 @@
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+import Foundation
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+
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+#if os(iOS) || os(tvOS)
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+
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+internal func accessibilityPostLayoutChangedNotification(withElement element: Any? = nil)
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+{
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+ UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, element)
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+}
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+
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+internal func accessibilityPostScreenChangedNotification(withElement element: Any? = nil)
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+{
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+ UIAccessibilityPostNotification(UIAccessibilityScreenChangedNotification, element)
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+}
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+
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+open class NSUIAccessibilityElement: UIAccessibilityElement
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+{
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+ private let containerView: UIView
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+
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+ final var isHeader: Bool = false
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+ {
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+ didSet
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+ {
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+ accessibilityTraits = isHeader ? UIAccessibilityTraitHeader : UIAccessibilityTraitNone
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+ }
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+ }
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+
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+ final var isSelected: Bool = false
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+ {
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+ didSet
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+ {
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+ accessibilityTraits = isSelected ? UIAccessibilityTraitSelected : UIAccessibilityTraitNone
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+ }
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+ }
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+
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+ override init(accessibilityContainer container: Any)
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+ {
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+ // We can force unwrap since all chart views are subclasses of UIView
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+ containerView = container as! UIView
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+ super.init(accessibilityContainer: container)
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+ }
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+
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+ override open var accessibilityFrame: CGRect
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+ {
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+ get
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+ {
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+ return super.accessibilityFrame
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+ }
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+
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+ set
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+ {
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+ super.accessibilityFrame = containerView.convert(newValue, to: UIScreen.main.coordinateSpace)
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+ }
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+ }
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+}
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+
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+extension NSUIView
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+{
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+ /// An array of accessibilityElements that is used to implement UIAccessibilityContainer internally.
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+ /// Subclasses **MUST** override this with an array of such elements.
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+ @objc open func accessibilityChildren() -> [Any]?
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+ {
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+ return nil
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+ }
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+
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+ public final override var isAccessibilityElement: Bool
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+ {
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+ get { return false } // Return false here, so we can make individual elements accessible
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+ set { }
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+ }
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+
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+ open override func accessibilityElementCount() -> Int
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+ {
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+ return accessibilityChildren()?.count ?? 0
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+ }
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+
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+ open override func accessibilityElement(at index: Int) -> Any?
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+ {
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+ return accessibilityChildren()?[index]
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+ }
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+
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+ open override func index(ofAccessibilityElement element: Any) -> Int
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+ {
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+ guard let axElement = element as? NSUIAccessibilityElement else { return -1 }
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+ return (accessibilityChildren() as? [NSUIAccessibilityElement])?.index(of: axElement) ?? -1
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+ }
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+}
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+
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+#endif
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+
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+#if os(OSX)
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+
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+internal func accessibilityPostLayoutChangedNotification(withElement element: Any? = nil)
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+{
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+ guard let validElement = element else { return }
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+ NSAccessibilityPostNotification(validElement, .layoutChanged)
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+}
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+
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+internal func accessibilityPostScreenChangedNotification(withElement element: Any? = nil)
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+{
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+ // Placeholder
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+}
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+
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+open class NSUIAccessibilityElement: NSAccessibilityElement
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+{
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+ private let containerView: NSView
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+
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+ final var isHeader: Bool = false
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+ {
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+ didSet
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+ {
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+ setAccessibilityRole(isHeader ? .staticText : .none)
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+ }
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+ }
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+
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+ // TODO: Make isSelected toggle a selected state in conjunction with a .valueChanged notification
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+ /// A placeholder for parity with iOS. Has no effect.
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+ final var isSelected: Bool = false
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+
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+ open var accessibilityLabel: String
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+ {
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+ get
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+ {
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+ return accessibilityLabel() ?? ""
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+ }
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+
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+ set
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+ {
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+ setAccessibilityLabel(newValue)
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+ }
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+ }
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+
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+ open var accessibilityFrame: NSRect
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+ {
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+ get
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+ {
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+ return accessibilityFrame()
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+ }
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+
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+ set
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+ {
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+ let bounds = NSAccessibilityFrameInView(containerView, newValue)
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+ setAccessibilityFrame(bounds)
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+ }
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+ }
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+
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+ init(accessibilityContainer container: Any)
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+ {
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+ // We can force unwrap since all chart views are subclasses of NSView
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+ containerView = container as! NSView
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+
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+ super.init()
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+
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+ setAccessibilityParent(containerView)
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+ setAccessibilityRole(.row)
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+ }
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+
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+ open override func accessibilityParent() -> Any?
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+ {
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+ return super.accessibilityParent()
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+ }
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+}
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+
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+/*
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+/// This would have been needed if the NSAccessibilityList protocol worked.
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+extension NSUIAccessibilityElement: NSAccessibilityRow
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+{
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+ open override func accessibilityChildren() -> [Any]?
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+ {
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+ return nil
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+ }
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+
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+ open override func accessibilityIdentifier() -> String
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+ {
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+ return super.accessibilityIdentifier() ?? ""
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+ }
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+
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+ open override func accessibilityIndex() -> Int
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+ {
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+ guard let parentChartView = containerView as? ChartViewBase else { return -1 }
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+ return (parentChartView.accessibilityChildren() as? [NSUIAccessibilityElement])?.index(of: self) ?? -1
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+ }
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+}
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+*/
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+
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+/// NOTE: Using Swift makes all NSAccessibility methods required
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+/// Since the method signatures for accessibilityRows() differ between the NSAccessibilityTable and NSAccessibility protocols,
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+/// trying to override or create either causes a compiler error. Hence we resort to calling setAccessibilityRole(.list)
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+/// while making NSUIView an NSAccessibilityGroup.
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+extension NSUIView: NSAccessibilityGroup
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+{
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+ open override func accessibilityChildren() -> [Any]?
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+ {
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+ return nil
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+ }
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+
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+ open override func accessibilityLabel() -> String?
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+ {
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+ return "Chart View"
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+ }
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+
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+ open override func accessibilityRows() -> [Any]?
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+ {
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+ return accessibilityChildren()
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+ }
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+}
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+
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+#endif
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Adi