Update encryption key animations

submodules/TelegramCallsUI/Sources/VideoChatEncryptionKeyComponent.swift

@@ -7,6 +7,96 @@ import BalancedTextComponent
 import TelegramPresentationData
 import CallsEmoji
 
+private final class EmojiContainerView: UIView {
+    private let maskImageView: UIImageView?
+    let contentView: UIView
+
+    var isMaskEnabled: Bool = false {
+        didSet {
+            if self.isMaskEnabled != oldValue {
+                if self.isMaskEnabled {
+                    self.mask = self.maskImageView
+                } else {
+                    self.mask = nil
+                }
+            }
+        }
+    }
+
+    init(hasMask: Bool) {
+        if hasMask {
+            self.maskImageView = UIImageView()
+        } else {
+            self.maskImageView = nil
+        }
+
+        self.contentView = UIView()
+        self.contentView.layer.anchorPoint = CGPoint(x: 0.0, y: 0.0)
+        self.contentView.center = CGPoint(x: 0.0, y: 0.0)
+
+        super.init(frame: CGRect())
+        
+        if let maskImageView = self.maskImageView {
+            self.mask = maskImageView
+        }
+        self.addSubview(self.contentView)
+        self.clipsToBounds = hasMask
+    }
+
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    func update(size: CGSize, borderWidth: CGFloat) {
+        let minimalHeight = borderWidth * 2.0 + 1.0
+        let minimalSize = CGSize(width: 4.0, height: minimalHeight)
+
+        if let maskImageView = self.maskImageView, maskImageView.image?.size != minimalSize {
+            let generatedImage = generateImage(minimalSize, rotatedContext: { imageSize, context in
+                context.clear(CGRect(origin: CGPoint(), size: imageSize))
+
+                let height: CGFloat = borderWidth
+                let baseGradientAlpha: CGFloat = 1.0
+                let numSteps = 8
+                let firstStep = 0
+                let firstLocation = 0.0
+                let colors = (0 ..< numSteps).map { i -> UIColor in
+                    if i < firstStep {
+                        return UIColor(white: 1.0, alpha: 1.0)
+                    } else {
+                        let step: CGFloat = CGFloat(i - firstStep) / CGFloat(numSteps - firstStep - 1)
+                        let value: CGFloat = bezierPoint(0.42, 0.0, 0.58, 1.0, step)
+                        return UIColor(white: 1.0, alpha: baseGradientAlpha * value)
+                    }
+                }
+                var locations = (0 ..< numSteps).map { i -> CGFloat in
+                    if i < firstStep {
+                        return 0.0
+                    } else {
+                        let step: CGFloat = CGFloat(i - firstStep) / CGFloat(numSteps - firstStep - 1)
+                        return (firstLocation + (1.0 - firstLocation) * step)
+                    }
+                }
+
+                let gradient = CGGradient(colorsSpace: DeviceGraphicsContextSettings.shared.colorSpace, colors: colors.map { $0.cgColor } as CFArray, locations: &locations)!
+
+                context.setFillColor(UIColor.white.cgColor)
+                context.fill(CGRect(origin: CGPoint(x: 0.0, y: height), size: CGSize(width: imageSize.width, height: 1.0)))
+
+                context.drawLinearGradient(gradient, start: CGPoint(x: 0.0, y: 0.0), end: CGPoint(x: 0.0, y: height), options: CGGradientDrawingOptions())
+                context.drawLinearGradient(gradient, start: CGPoint(x: 0.0, y: imageSize.height), end: CGPoint(x: 0.0, y: imageSize.height - height), options: CGGradientDrawingOptions())
+            })
+
+            let capInsets = UIEdgeInsets(top: borderWidth, left: 0, bottom: borderWidth, right: 0)
+            maskImageView.image = generatedImage?.resizableImage(withCapInsets: capInsets, resizingMode: .stretch)
+        }
+        if let maskImageView = self.maskImageView {
+            maskImageView.frame = CGRect(origin: CGPoint(), size: size)
+        }
+        self.contentView.bounds = CGRect(origin: CGPoint(), size: size)
+    }
+}
+
 private final class EmojiItemComponent: Component {
     let emoji: String?
 
@@ -22,8 +112,9 @@ private final class EmojiItemComponent: Component {
     }
 
     final class View: UIView {
+        private let containerView: EmojiContainerView
         private let measureEmojiView = ComponentView<Empty>()
-        private var pendingContainerView: UIView?
+        private var pendingContainerView: EmojiContainerView?
         private var pendingEmojiViews: [ComponentView<Empty>] = []
         private var emojiView: ComponentView<Empty>?
 
@@ -33,7 +124,11 @@ private final class EmojiItemComponent: Component {
         private var pendingEmojiValues: [String]?
 
         override init(frame: CGRect) {
+            self.containerView = EmojiContainerView(hasMask: true)
+
             super.init(frame: frame)
+
+            self.addSubview(self.containerView)
         }
 
         required init?(coder: NSCoder) {
@@ -44,6 +139,8 @@ private final class EmojiItemComponent: Component {
         }
 
         func update(component: EmojiItemComponent, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: ComponentTransition) -> CGSize {
+            let pendingContainerInset: CGFloat = 6.0
+
             self.component = component
             self.state = state
 
@@ -56,9 +153,34 @@ private final class EmojiItemComponent: Component {
                 containerSize: CGSize(width: 200.0, height: 200.0)
             )
 
+            let containerFrame = CGRect(origin: CGPoint(x: -pendingContainerInset, y: -pendingContainerInset), size: CGSize(width: size.width + pendingContainerInset * 2.0, height: size.height + pendingContainerInset * 2.0))
+            self.containerView.frame = containerFrame
+            self.containerView.update(size: containerFrame.size, borderWidth: 12.0)
+
+            /*let maxBlur: CGFloat = 4.0
+            if component.emoji == nil, (self.containerView.contentView.layer.filters == nil || self.containerView.contentView.layer.filters?.count == 0) {
+                if let blurFilter = CALayer.blur() {
+                    blurFilter.setValue(maxBlur as NSNumber, forKey: "inputRadius")
+                    self.containerView.contentView.layer.filters = [blurFilter]
+                    self.containerView.contentView.layer.animate(from: 0.0 as NSNumber, to: maxBlur as NSNumber, keyPath: "filters.gaussianBlur.inputRadius", timingFunction: CAMediaTimingFunctionName.easeOut.rawValue, duration: 0.2, removeOnCompletion: true)
+                }
+            } else if self.containerView.contentView.layer.filters != nil && self.containerView.contentView.layer.filters?.count != 0 {
+                if let blurFilter = CALayer.blur() {
+                    blurFilter.setValue(0.0 as NSNumber, forKey: "inputRadius")
+                    self.containerView.contentView.layer.filters = [blurFilter]
+                    self.containerView.contentView.layer.animate(from: maxBlur as NSNumber, to: 0.0 as NSNumber, keyPath: "filters.gaussianBlur.inputRadius", timingFunction: CAMediaTimingFunctionName.easeOut.rawValue, duration: 0.2, removeOnCompletion: false, completion: { [weak self] flag in
+                        if flag, let self {
+                            self.containerView.contentView.layer.filters = nil
+                        }
+                    })
+                }
+            }*/
+            
             let borderEmoji = 2
             let numEmoji = borderEmoji * 2 + 3
 
+            var previousEmojiView: ComponentView<Empty>?
+
             if let emoji = component.emoji {
                 let emojiView: ComponentView<Empty>
                 var emojiViewTransition = transition
@@ -77,19 +199,41 @@ private final class EmojiItemComponent: Component {
                     environment: {},
                     containerSize: CGSize(width: 200.0, height: 200.0)
                 )
-                let emojiFrame = CGRect(origin: CGPoint(x: floor((size.width - emojiSize.width) * 0.5), y: floor((size.height - emojiSize.height) * 0.5)), size: emojiSize)
+                let emojiFrame = CGRect(origin: CGPoint(x: pendingContainerInset + floor((size.width - emojiSize.width) * 0.5), y: pendingContainerInset + floor((size.height - emojiSize.height) * 0.5)), size: emojiSize)
                 if let emojiComponentView = emojiView.view {
                     if emojiComponentView.superview == nil {
-                        self.addSubview(emojiComponentView)
+                        self.containerView.contentView.addSubview(emojiComponentView)
                     }
                     emojiViewTransition.setFrame(view: emojiComponentView, frame: emojiFrame)
+
+                    if let pendingContainerView = self.pendingContainerView {
+                        self.pendingContainerView = nil
+                        self.pendingEmojiViews.removeAll()
+
+                        let currentPendingContainerOffset = pendingContainerView.contentView.layer.presentation()?.position.y ?? pendingContainerView.contentView.layer.position.y
+                        
+                        pendingContainerView.contentView.layer.removeAnimation(forKey: "offsetCycle")
+                        pendingContainerView.contentView.layer.position.y = currentPendingContainerOffset
+
+                        let animateTransition: ComponentTransition = .spring(duration: 0.4)
+                        let targetOffset: CGFloat = CGFloat(borderEmoji - 1) * size.height
+                        animateTransition.setPosition(layer: pendingContainerView.contentView.layer, position: CGPoint(x: 0.0, y: targetOffset), completion: { [weak self, weak pendingContainerView] _ in
+                            pendingContainerView?.removeFromSuperview()
+
+                            self?.containerView.isMaskEnabled = false
+                        })
+
+                        animateTransition.animatePosition(view: emojiComponentView, from: CGPoint(x: 0.0, y: currentPendingContainerOffset - targetOffset), to: CGPoint(), additive: true)
+                    } else {
+                        self.containerView.isMaskEnabled = false
+                    }
                 }
                 
                 self.pendingEmojiValues = nil
             } else {
                 if let emojiView = self.emojiView {
                     self.emojiView = nil
-                    emojiView.view?.removeFromSuperview()
+                    previousEmojiView = emojiView
                 }
                 
                 if self.pendingEmojiValues?.count != numEmoji {
@@ -105,11 +249,13 @@ private final class EmojiItemComponent: Component {
             }
 
             if let pendingEmojiValues, pendingEmojiValues.count == numEmoji {
-                let pendingContainerView: UIView
+                self.containerView.isMaskEnabled = true
+                
+                let pendingContainerView: EmojiContainerView
                 if let current = self.pendingContainerView {
                     pendingContainerView = current
                 } else {
-                    pendingContainerView = UIView()
+                    pendingContainerView = EmojiContainerView(hasMask: false)
                     self.pendingContainerView = pendingContainerView
                 }
 
@@ -131,27 +277,70 @@ private final class EmojiItemComponent: Component {
                     )
                     if let pendingEmojiComponentView = pendingEmojiView.view {
                         if pendingEmojiComponentView.superview == nil {
-                            pendingContainerView.addSubview(pendingEmojiComponentView)
+                            pendingContainerView.contentView.addSubview(pendingEmojiComponentView)
                         }
-                        pendingEmojiComponentView.frame = CGRect(origin: CGPoint(x: 0.0, y: CGFloat(i) * size.height), size: pendingEmojiViewSize)
+                        pendingEmojiComponentView.frame = CGRect(origin: CGPoint(x: pendingContainerInset, y: pendingContainerInset + CGFloat(i) * size.height), size: pendingEmojiViewSize)
                     }
                 }
 
-                pendingContainerView.frame = CGRect(origin: CGPoint(), size: size)
+                pendingContainerView.frame = CGRect(origin: CGPoint(), size: containerFrame.size)
+                pendingContainerView.update(size: containerFrame.size, borderWidth: 12.0)
 
                 if pendingContainerView.superview == nil {
-                    self.addSubview(pendingContainerView)
+                    self.containerView.contentView.addSubview(pendingContainerView)
 
-                    let animation = CABasicAnimation(keyPath: "sublayerTransform.translation.y")
+                    let startTime = CACurrentMediaTime()
-                    //animation.duration = 4.2
+
+                    var loopAnimationOffset: Double = 0.0
+                    if let previousEmojiComponentView = previousEmojiView?.view {
+                        previousEmojiView = nil
+
+                        pendingContainerView.contentView.addSubview(previousEmojiComponentView)
+                        previousEmojiComponentView.center = previousEmojiComponentView.center.offsetBy(dx: 0.0, dy: CGFloat(numEmoji) * size.height)
+
+                        let animation = CABasicAnimation(keyPath: "position.y")
+                        loopAnimationOffset = 0.25
+                        animation.duration = loopAnimationOffset
+                        animation.fromValue = -CGFloat(numEmoji) * size.height
+                        animation.toValue = 0.0
+                        animation.timingFunction = CAMediaTimingFunction(name: .easeIn)
+                        animation.autoreverses = false
+                        animation.repeatCount = 1.0
+                        animation.fillMode = .backwards
+                        animation.isRemovedOnCompletion = true
+                        animation.beginTime = pendingContainerView.contentView.layer.convertTime(startTime, from: nil)
+                        animation.isAdditive = true
+
+                        animation.completion = { [weak previousEmojiComponentView] _ in
+                            previousEmojiComponentView?.removeFromSuperview()
+                        }
+                        
+                        pendingContainerView.contentView.layer.add(animation, forKey: "offsetCyclePre")
+                    } 
+
+                    let animation = CABasicAnimation(keyPath: "position.y")
                     animation.duration = 0.2
                     animation.fromValue = -CGFloat(numEmoji - borderEmoji) * size.height
                     animation.toValue = CGFloat(borderEmoji - 3) * size.height
                     animation.timingFunction = CAMediaTimingFunction(name: .linear)
                     animation.autoreverses = false
                     animation.repeatCount = .infinity
+                    animation.fillMode = .forwards
 
-                    pendingContainerView.layer.add(animation, forKey: "offsetCycle")
+                    animation.beginTime = pendingContainerView.contentView.layer.convertTime(startTime + loopAnimationOffset, from: nil)
+                    
+                    pendingContainerView.contentView.layer.add(animation, forKey: "offsetCycle")
+                } else if pendingContainerView.contentView.layer.animation(forKey: "offsetCycle") == nil {
+                    let animation = CABasicAnimation(keyPath: "position.y")
+                    animation.duration = 0.2
+                    animation.fromValue = -CGFloat(numEmoji - borderEmoji) * size.height
+                    animation.toValue = CGFloat(borderEmoji - 3) * size.height
+                    animation.timingFunction = CAMediaTimingFunction(name: .linear)
+                    animation.autoreverses = false
+                    animation.repeatCount = .infinity
+                    animation.fillMode = .forwards
+
+                    pendingContainerView.contentView.layer.add(animation, forKey: "offsetCycle")
                 }
             } else if let pendingContainerView = self.pendingContainerView {
                 self.pendingContainerView = nil
@@ -163,8 +352,9 @@ private final class EmojiItemComponent: Component {
                 self.pendingEmojiViews.removeAll()
             }
 
-            //self.layer.borderColor = UIColor.red.cgColor
+            if let previousEmojiView {
-            //self.layer.borderWidth = 4.0
+                previousEmojiView.view?.removeFromSuperview()
+            }
 
             return size
         }
@@ -227,10 +417,16 @@ final class VideoChatEncryptionKeyComponent: Component {
         private let expandedButtonText = ComponentView<Empty>()
 
         private var component: VideoChatEncryptionKeyComponent?
+        private weak var state: EmptyComponentState?
         private var isUpdating: Bool = false
         
         private var tapRecognizer: TapLongTapOrDoubleTapGestureRecognizer?
 
+        #if DEBUG
+        private var mockStateTimer: Foundation.Timer?
+        private var mockCurrentKey: [String]?
+        #endif
+        
         override init(frame: CGRect) {
             self.containerView = UIView()
             self.containerView.clipsToBounds = true
@@ -247,6 +443,10 @@ final class VideoChatEncryptionKeyComponent: Component {
             fatalError("init(coder:) has not been implemented")
         }
 
+        deinit {
+            self.mockStateTimer?.invalidate()
+        }
+        
         @objc private func tapGesture(_ recognizer: TapLongTapOrDoubleTapGestureRecognizer) {
             guard let component = self.component else {
                 return
@@ -270,7 +470,31 @@ final class VideoChatEncryptionKeyComponent: Component {
                 self.isUpdating = false
             }
 
+            #if DEBUG && false
+            if self.component == nil {
+                self.mockStateTimer = Foundation.Timer.scheduledTimer(withTimeInterval: 4.0, repeats: true, block: { [weak self] _ in
+                    guard let self else {
+                        return
+                    }
+
+                    if self.mockCurrentKey == nil {
+                        self.mockCurrentKey = (0 ..< 4).map { _ in randomCallsEmoji() ?? "👍" }
+                    } else {
+                        self.mockCurrentKey = nil
+                    }
+
+                    if !self.isUpdating {
+                        self.state?.updated(transition: .spring(duration: 0.4), isLocal: true)
+                    }
+                })
+            }
+            let emoji = self.mockCurrentKey ?? []
+            #else
+            let emoji = component.emoji
+            #endif
+            
             self.component = component
+            self.state = state
             
             let alphaTransition: ComponentTransition
             if transition.animation.isImmediate {
@@ -303,7 +527,7 @@ final class VideoChatEncryptionKeyComponent: Component {
                 return emojiItem.update(
                     transition: transition,
                     component: AnyComponent(EmojiItemComponent(
-                        emoji: i < component.emoji.count ? component.emoji[i] : nil
+                        emoji: i < emoji.count ? emoji[i] : nil
                     )),
                     environment: {},
                     containerSize: CGSize(width: 200.0, height: 200.0)