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263 lines
12 KiB
Swift
263 lines
12 KiB
Swift
import Foundation
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import UIKit
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import Display
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import ComponentFlow
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import ViewControllerComponent
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public final class SheetComponentEnvironment: Equatable {
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public let isDisplaying: Bool
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public let isCentered: Bool
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public let dismiss: (Bool) -> Void
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public init(isDisplaying: Bool, isCentered: Bool, dismiss: @escaping (Bool) -> Void) {
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self.isDisplaying = isDisplaying
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self.isCentered = isCentered
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self.dismiss = dismiss
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}
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public static func ==(lhs: SheetComponentEnvironment, rhs: SheetComponentEnvironment) -> Bool {
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if lhs.isDisplaying != rhs.isDisplaying {
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return false
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}
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if lhs.isCentered != rhs.isCentered {
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return false
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}
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return true
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}
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}
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public final class SheetComponent<ChildEnvironmentType: Equatable>: Component {
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public typealias EnvironmentType = (ChildEnvironmentType, SheetComponentEnvironment)
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public let content: AnyComponent<ChildEnvironmentType>
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public let backgroundColor: UIColor
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public let animateOut: ActionSlot<Action<()>>
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public init(content: AnyComponent<ChildEnvironmentType>, backgroundColor: UIColor, animateOut: ActionSlot<Action<()>>) {
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self.content = content
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self.backgroundColor = backgroundColor
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self.animateOut = animateOut
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}
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public static func ==(lhs: SheetComponent, rhs: SheetComponent) -> Bool {
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if lhs.content != rhs.content {
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return false
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}
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if lhs.backgroundColor != rhs.backgroundColor {
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return false
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}
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if lhs.animateOut != rhs.animateOut {
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return false
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}
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return true
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}
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public final class View: UIView, UIScrollViewDelegate {
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private let dimView: UIView
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private let scrollView: UIScrollView
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private let backgroundView: UIView
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private let contentView: ComponentHostView<ChildEnvironmentType>
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private var previousIsDisplaying: Bool = false
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private var dismiss: ((Bool) -> Void)?
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override init(frame: CGRect) {
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self.dimView = UIView()
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self.dimView.backgroundColor = UIColor(white: 0.0, alpha: 0.4)
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self.scrollView = UIScrollView()
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self.scrollView.delaysContentTouches = false
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if #available(iOSApplicationExtension 11.0, iOS 11.0, *) {
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self.scrollView.contentInsetAdjustmentBehavior = .never
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}
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self.scrollView.showsVerticalScrollIndicator = false
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self.scrollView.showsHorizontalScrollIndicator = false
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self.scrollView.alwaysBounceVertical = true
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self.backgroundView = UIView()
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self.backgroundView.layer.cornerRadius = 10.0
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self.backgroundView.layer.masksToBounds = true
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self.contentView = ComponentHostView<ChildEnvironmentType>()
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super.init(frame: frame)
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self.scrollView.delegate = self
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self.addSubview(self.dimView)
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self.scrollView.addSubview(self.backgroundView)
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self.scrollView.addSubview(self.contentView)
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self.addSubview(self.scrollView)
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self.dimView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.dimViewTapGesture(_:))))
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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@objc private func dimViewTapGesture(_ recognizer: UITapGestureRecognizer) {
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if case .ended = recognizer.state {
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self.dismiss?(true)
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}
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}
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private var scrollingOut = false
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public func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
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let contentOffset = (scrollView.contentOffset.y + scrollView.contentInset.top - scrollView.contentSize.height) * -1.0
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let dismissalOffset = scrollView.contentSize.height - scrollView.contentInset.top + scrollView.contentSize.height
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let delta = dismissalOffset - contentOffset
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let initialVelocity = !delta.isZero ? velocity.y / delta : 0.0
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let currentContentOffset = scrollView.contentOffset
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targetContentOffset.pointee = currentContentOffset
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if velocity.y > 300.0 {
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self.animateOut(initialVelocity: initialVelocity, completion: {
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self.dismiss?(false)
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})
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} else {
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if contentOffset < scrollView.contentSize.height * 0.1 {
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if contentOffset < 0.0 {
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} else {
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scrollView.setContentOffset(CGPoint(x: 0.0, y: scrollView.contentSize.height - scrollView.contentInset.top), animated: true)
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}
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} else {
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self.animateOut(initialVelocity: initialVelocity, completion: {
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self.dismiss?(false)
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})
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}
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}
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}
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private var ignoreScrolling: Bool = false
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public func scrollViewDidScroll(_ scrollView: UIScrollView) {
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guard !self.ignoreScrolling else {
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return
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}
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let contentOffset = (scrollView.contentOffset.y + scrollView.contentInset.top - scrollView.contentSize.height) * -1.0
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if contentOffset >= scrollView.contentSize.height {
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self.dismiss?(false)
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}
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}
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override public func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
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if !self.backgroundView.bounds.contains(self.convert(point, to: self.backgroundView)) {
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return self.dimView
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}
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return super.hitTest(point, with: event)
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}
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private func animateIn() {
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self.dimView.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.3)
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let transition = ContainedViewLayoutTransition.animated(duration: 0.4, curve: .spring)
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let targetPosition = self.scrollView.center
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self.scrollView.center = targetPosition.offsetBy(dx: 0.0, dy: self.scrollView.contentSize.height)
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transition.animateView(allowUserInteraction: true, {
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self.scrollView.center = targetPosition
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})
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}
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private func animateOut(initialVelocity: CGFloat? = nil, completion: @escaping () -> Void) {
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self.isUserInteractionEnabled = false
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self.dimView.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.3, removeOnCompletion: false)
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if let initialVelocity = initialVelocity {
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let transition = ContainedViewLayoutTransition.animated(duration: 0.35, curve: .customSpring(damping: 124.0, initialVelocity: initialVelocity))
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let contentOffset = (self.scrollView.contentOffset.y + self.scrollView.contentInset.top - self.scrollView.contentSize.height) * -1.0
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let dismissalOffset = self.scrollView.contentSize.height
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let delta = dismissalOffset - contentOffset
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transition.updatePosition(layer: self.scrollView.layer, position: CGPoint(x: self.scrollView.center.x, y: self.scrollView.center.y + delta), completion: { _ in
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completion()
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})
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} else {
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self.scrollView.layer.animatePosition(from: CGPoint(), to: CGPoint(x: 0.0, y: self.scrollView.contentSize.height), duration: 0.25, timingFunction: CAMediaTimingFunctionName.easeInEaseOut.rawValue, removeOnCompletion: false, additive: true, completion: { _ in
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completion()
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})
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}
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}
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private var currentAvailableSize: CGSize?
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func update(component: SheetComponent<ChildEnvironmentType>, availableSize: CGSize, state: EmptyComponentState, environment: Environment<EnvironmentType>, transition: Transition) -> CGSize {
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let sheetEnvironment = environment[SheetComponentEnvironment.self].value
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component.animateOut.connect { [weak self] completion in
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guard let strongSelf = self else {
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return
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}
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strongSelf.animateOut {
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completion(Void())
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}
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}
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if self.backgroundView.backgroundColor != component.backgroundColor {
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self.backgroundView.backgroundColor = component.backgroundColor
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}
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transition.setFrame(view: self.dimView, frame: CGRect(origin: CGPoint(), size: availableSize), completion: nil)
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let containerSize: CGSize
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if sheetEnvironment.isCentered {
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let verticalInset: CGFloat = 44.0
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let maxSide = max(availableSize.width, availableSize.height)
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let minSide = min(availableSize.width, availableSize.height)
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containerSize = CGSize(width: min(availableSize.width - 20.0, floor(maxSide / 2.0)), height: min(availableSize.height, minSide) - verticalInset * 2.0)
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} else {
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containerSize = CGSize(width: availableSize.width, height: .greatestFiniteMagnitude)
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}
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let contentSize = self.contentView.update(
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transition: transition,
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component: component.content,
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environment: {
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environment[ChildEnvironmentType.self]
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},
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containerSize: containerSize
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)
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self.ignoreScrolling = true
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if sheetEnvironment.isCentered {
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transition.setFrame(view: self.contentView, frame: CGRect(origin: CGPoint(x: floorToScreenPixels((availableSize.width - contentSize.width) / 2.0), y: 0.0), size: contentSize), completion: nil)
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transition.setFrame(view: self.backgroundView, frame: CGRect(origin: CGPoint(x: floorToScreenPixels((availableSize.width - contentSize.width) / 2.0), y: floorToScreenPixels((availableSize.height - contentSize.height) / 2.0)), size: contentSize), completion: nil)
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} else {
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transition.setFrame(view: self.contentView, frame: CGRect(origin: .zero, size: contentSize), completion: nil)
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transition.setFrame(view: self.backgroundView, frame: CGRect(origin: .zero, size: CGSize(width: contentSize.width, height: contentSize.height + 1000.0)), completion: nil)
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}
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transition.setFrame(view: self.scrollView, frame: CGRect(origin: CGPoint(), size: availableSize), completion: nil)
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self.scrollView.contentSize = contentSize
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self.scrollView.contentInset = UIEdgeInsets(top: max(0.0, availableSize.height - contentSize.height) + contentSize.height, left: 0.0, bottom: 0.0, right: 0.0)
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self.ignoreScrolling = false
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if let currentAvailableSize = self.currentAvailableSize, currentAvailableSize.height != availableSize.height {
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self.scrollView.contentOffset = CGPoint(x: 0.0, y: -(availableSize.height - contentSize.height))
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}
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self.currentAvailableSize = availableSize
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if environment[SheetComponentEnvironment.self].value.isDisplaying, !self.previousIsDisplaying, let _ = transition.userData(ViewControllerComponentContainer.AnimateInTransition.self) {
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self.animateIn()
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} else if !environment[SheetComponentEnvironment.self].value.isDisplaying, self.previousIsDisplaying, let _ = transition.userData(ViewControllerComponentContainer.AnimateOutTransition.self) {
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self.animateOut(completion: {})
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}
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self.previousIsDisplaying = sheetEnvironment.isDisplaying
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self.dismiss = sheetEnvironment.dismiss
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return availableSize
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}
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}
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public func makeView() -> View {
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return View(frame: CGRect())
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}
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public func update(view: View, availableSize: CGSize, state: EmptyComponentState, environment: Environment<EnvironmentType>, transition: Transition) -> CGSize {
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return view.update(component: self, availableSize: availableSize, state: state, environment: environment, transition: transition)
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}
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}
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