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UIKit.swift
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UIKit.swift
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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Foundation
@_exported import UIKit
#if os(iOS) || os(tvOS)
import _SwiftUIKitOverlayShims
#endif
//===----------------------------------------------------------------------===//
// UIGeometry
//===----------------------------------------------------------------------===//
public extension UIEdgeInsets {
static var zero: UIEdgeInsets {
@_transparent // @fragile
get { return UIEdgeInsets(top: 0.0, left: 0.0, bottom: 0.0, right: 0.0) }
}
}
public extension UIOffset {
static var zero: UIOffset {
@_transparent // @fragile
get { return UIOffset(horizontal: 0.0, vertical: 0.0) }
}
}
//===----------------------------------------------------------------------===//
// Equatable types.
//===----------------------------------------------------------------------===//
@_transparent // @fragile
public func == (lhs: UIEdgeInsets, rhs: UIEdgeInsets) -> Bool {
return lhs.top == rhs.top &&
lhs.left == rhs.left &&
lhs.bottom == rhs.bottom &&
lhs.right == rhs.right
}
extension UIEdgeInsets : Equatable {}
@_transparent // @fragile
public func == (lhs: UIOffset, rhs: UIOffset) -> Bool {
return lhs.horizontal == rhs.horizontal &&
lhs.vertical == rhs.vertical
}
extension UIOffset : Equatable {}
//===----------------------------------------------------------------------===//
// Numeric backed types
//===----------------------------------------------------------------------===//
@available(swift 4)
public protocol _UIKitNumericRawRepresentable : RawRepresentable, Comparable where RawValue: Comparable & Numeric {}
extension _UIKitNumericRawRepresentable {
public static func <(lhs: Self, rhs: Self) -> Bool {
return lhs.rawValue < rhs.rawValue
}
public static func +(lhs: Self, rhs: RawValue) -> Self {
return Self(rawValue: lhs.rawValue + rhs)!
}
public static func +(lhs: RawValue, rhs: Self) -> Self {
return Self(rawValue: lhs + rhs.rawValue)!
}
public static func -(lhs: Self, rhs: RawValue) -> Self {
return Self(rawValue: lhs.rawValue - rhs)!
}
public static func -(lhs: Self, rhs: Self) -> RawValue {
return lhs.rawValue - rhs.rawValue
}
public static func +=(lhs: inout Self, rhs: RawValue) {
lhs = Self(rawValue: lhs.rawValue + rhs)!
}
public static func -=(lhs: inout Self, rhs: RawValue) {
lhs = Self(rawValue: lhs.rawValue - rhs)!
}
}
@available(swift 4)
extension UIFont.Weight : _UIKitNumericRawRepresentable {}
#if !os(watchOS)
@available(swift 4)
extension UILayoutPriority : _UIKitNumericRawRepresentable {}
#endif
// These are un-imported macros in UIKit.
//===----------------------------------------------------------------------===//
// UIDeviceOrientation
//===----------------------------------------------------------------------===//
#if !os(watchOS) && !os(tvOS)
public extension UIDeviceOrientation {
var isLandscape: Bool {
return self == .landscapeLeft || self == .landscapeRight
}
var isPortrait: Bool {
return self == .portrait || self == .portraitUpsideDown
}
var isFlat: Bool {
return self == .faceUp || self == .faceDown
}
var isValidInterfaceOrientation: Bool {
switch self {
case .portrait, .portraitUpsideDown, .landscapeLeft, .landscapeRight:
return true
default:
return false
}
}
}
public func UIDeviceOrientationIsLandscape(
_ orientation: UIDeviceOrientation
) -> Bool {
return orientation.isLandscape
}
public func UIDeviceOrientationIsPortrait(
_ orientation: UIDeviceOrientation
) -> Bool {
return orientation.isPortrait
}
public func UIDeviceOrientationIsValidInterfaceOrientation(
_ orientation: UIDeviceOrientation) -> Bool
{
return orientation.isValidInterfaceOrientation
}
#endif
//===----------------------------------------------------------------------===//
// UIInterfaceOrientation
//===----------------------------------------------------------------------===//
#if !os(watchOS) && !os(tvOS)
public extension UIInterfaceOrientation {
var isLandscape: Bool {
return self == .landscapeLeft || self == .landscapeRight
}
var isPortrait: Bool {
return self == .portrait || self == .portraitUpsideDown
}
}
public func UIInterfaceOrientationIsPortrait(
_ orientation: UIInterfaceOrientation) -> Bool {
return orientation.isPortrait
}
public func UIInterfaceOrientationIsLandscape(
_ orientation: UIInterfaceOrientation
) -> Bool {
return orientation.isLandscape
}
#endif
// Overlays for variadic initializers.
#if !os(watchOS) && !os(tvOS)
public extension UIActionSheet {
convenience init(title: String?,
delegate: UIActionSheetDelegate?,
cancelButtonTitle: String?,
destructiveButtonTitle: String?,
// Hack around overload ambiguity with non-variadic constructor.
// <rdar://problem/16704770>
otherButtonTitles firstButtonTitle: String,
_ moreButtonTitles: String...) {
self.init(title: title,
delegate: delegate,
cancelButtonTitle: cancelButtonTitle,
destructiveButtonTitle: destructiveButtonTitle)
self.addButton(withTitle: firstButtonTitle)
for buttonTitle in moreButtonTitles {
self.addButton(withTitle: buttonTitle)
}
}
}
#endif
#if !os(watchOS) && !os(tvOS)
public extension UIAlertView {
convenience init(title: String,
message: String,
delegate: UIAlertViewDelegate?,
cancelButtonTitle: String?,
// Hack around overload ambiguity with non-variadic constructor.
// <rdar://problem/16704770>
otherButtonTitles firstButtonTitle: String,
_ moreButtonTitles: String...) {
self.init(title: title,
message: message,
delegate: delegate,
cancelButtonTitle: cancelButtonTitle)
self.addButton(withTitle: firstButtonTitle)
for buttonTitle in moreButtonTitles {
self.addButton(withTitle: buttonTitle)
}
}
}
#endif
#if !os(watchOS)
internal struct _UIViewQuickLookState {
static var views = Set<UIView>()
}
extension UIView : _DefaultCustomPlaygroundQuickLookable {
@available(*, deprecated, message: "UIView._defaultCustomPlaygroundQuickLook will be removed in a future Swift version")
public var _defaultCustomPlaygroundQuickLook: PlaygroundQuickLook {
if _UIViewQuickLookState.views.contains(self) {
return .view(UIImage())
} else {
_UIViewQuickLookState.views.insert(self)
// in case of an empty rectangle abort the logging
if (bounds.size.width == 0) || (bounds.size.height == 0) {
return .view(UIImage())
}
UIGraphicsBeginImageContextWithOptions(bounds.size, false, 0.0)
// UIKit is about to update this to be optional, so make it work
// with both older and newer SDKs. (In this context it should always
// be present.)
let ctx: CGContext! = UIGraphicsGetCurrentContext()
UIColor(white:1.0, alpha:0.0).set()
ctx.fill(bounds)
layer.render(in: ctx)
let image: UIImage! = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
_UIViewQuickLookState.views.remove(self)
return .view(image)
}
}
}
#endif
extension UIColor : _ExpressibleByColorLiteral {
@nonobjc public required convenience init(_colorLiteralRed red: Float,
green: Float,
blue: Float, alpha: Float) {
self.init(red: CGFloat(red), green: CGFloat(green),
blue: CGFloat(blue), alpha: CGFloat(alpha))
}
}
public typealias _ColorLiteralType = UIColor
extension UIImage : _ExpressibleByImageLiteral {
private convenience init!(failableImageLiteral name: String) {
self.init(named: name)
}
public required convenience init(imageLiteralResourceName name: String) {
self.init(failableImageLiteral: name)
}
}
public typealias _ImageLiteralType = UIImage
extension UIFontTextStyle {
@available(iOS 11.0, watchOS 4.0, tvOS 11.0, *)
public var metrics: UIFontMetrics {
return UIFontMetrics(forTextStyle: self)
}
}
#if !os(watchOS) // UIContentSizeCategory not available on watchOS
extension UIContentSizeCategory {
@available(iOS 11.0, tvOS 11.0, *)
public var isAccessibilityCategory: Bool {
return __UIContentSizeCategoryIsAccessibilityCategory(self)
}
@available(iOS 11.0, tvOS 11.0, *)
public static func < (left: UIContentSizeCategory, right: UIContentSizeCategory) -> Bool {
return __UIContentSizeCategoryCompareToCategory(left, right) == .orderedAscending
}
@available(iOS 11.0, tvOS 11.0, *)
public static func <= (left: UIContentSizeCategory, right: UIContentSizeCategory) -> Bool {
return __UIContentSizeCategoryCompareToCategory(left, right) != .orderedDescending
}
@available(iOS 11.0, tvOS 11.0, *)
public static func > (left: UIContentSizeCategory, right: UIContentSizeCategory) -> Bool {
return __UIContentSizeCategoryCompareToCategory(left, right) == .orderedDescending
}
@available(iOS 11.0, tvOS 11.0, *)
public static func >= (left: UIContentSizeCategory, right: UIContentSizeCategory) -> Bool {
return __UIContentSizeCategoryCompareToCategory(left, right) != .orderedAscending
}
}
#endif
//===----------------------------------------------------------------------===//
// Focus
//===----------------------------------------------------------------------===//
#if os(iOS) || os(tvOS)
@available(iOS 11.0, tvOS 11.0, *)
extension UIFocusEnvironment {
@available(iOS 11.0, tvOS 11.0, *)
public func contains(_ environment: UIFocusEnvironment) -> Bool {
return _swift_UIKit_UIFocusEnvironmentContainsEnvironment(self, environment)
}
}
@available(iOS 11.0, tvOS 11.0, *)
extension UIFocusItem {
@available(iOS 11.0, tvOS 11.0, *)
public var isFocused: Bool {
return self === UIScreen.main.focusedItem
}
}
#endif
//===----------------------------------------------------------------------===//
// NSItemProviderReading/Writing support
//===----------------------------------------------------------------------===//
#if os(iOS)
@available(iOS 11.0, *)
extension UIDragDropSession {
@available(iOS 11.0, *)
public func canLoadObjects<
T : _ObjectiveCBridgeable
>(ofClass: T.Type) -> Bool where T._ObjectiveCType : NSItemProviderReading {
return self.canLoadObjects(ofClass: T._ObjectiveCType.self);
}
}
@available(iOS 11.0, *)
extension UIDropSession {
@available(iOS 11.0, *)
public func loadObjects<
T : _ObjectiveCBridgeable
>(
ofClass: T.Type,
completion: @escaping ([T]) -> Void
) -> Progress where T._ObjectiveCType : NSItemProviderReading {
return self.loadObjects(ofClass: T._ObjectiveCType.self) { nss in
let natives = nss.map { $0 as! T }
completion(natives)
}
}
}
@available(iOS 11.0, *)
extension UIPasteConfiguration {
@available(iOS 11.0, *)
public convenience init<
T : _ObjectiveCBridgeable
>(forAccepting _: T.Type) where T._ObjectiveCType : NSItemProviderReading {
self.init(forAccepting: T._ObjectiveCType.self)
}
@available(iOS 11.0, *)
public func addTypeIdentifiers<
T : _ObjectiveCBridgeable
>(forAccepting aClass: T.Type)
where T._ObjectiveCType : NSItemProviderReading {
self.addTypeIdentifiers(forAccepting: T._ObjectiveCType.self)
}
}
extension UIPasteboard {
@available(iOS 11.0, *)
public func setObjects<
T : _ObjectiveCBridgeable
>(_ objects: [T]) where T._ObjectiveCType : NSItemProviderWriting {
// Using a simpler `$0 as! T._ObjectiveCType` triggers and assertion in
// the compiler.
self.setObjects(objects.map { $0._bridgeToObjectiveC() })
}
@available(iOS 11.0, *)
public func setObjects<
T : _ObjectiveCBridgeable
>(
_ objects: [T],
localOnly: Bool,
expirationDate: Date?
) where T._ObjectiveCType : NSItemProviderWriting {
self.setObjects(
// Using a simpler `$0 as! T._ObjectiveCType` triggers and assertion in
// the compiler.
objects.map { $0._bridgeToObjectiveC() },
localOnly: localOnly,
expirationDate: expirationDate)
}
}
#endif