Video message recording improvements

submodules/TelegramUI/Components/VideoMessageCameraScreen/Sources/RecordingProgressView.swift

@@ -0,0 +1,59 @@
+import Foundation
+import UIKit
+import Display
+
+private extension SimpleShapeLayer {
+    func animateStrokeStart(from: CGFloat, to: CGFloat, duration: Double, delay: Double = 0.0, timingFunction: String = CAMediaTimingFunctionName.easeInEaseOut.rawValue, removeOnCompletion: Bool = true, completion: ((Bool) -> ())? = nil) {
+        self.animate(from: NSNumber(value: Float(from)), to: NSNumber(value: Float(to)), keyPath: "strokeStart", timingFunction: timingFunction, duration: duration, delay: delay, removeOnCompletion: removeOnCompletion, completion: completion)
+    }
+    
+    func animateStrokeEnd(from: CGFloat, to: CGFloat, duration: Double, delay: Double = 0.0, timingFunction: String = CAMediaTimingFunctionName.easeInEaseOut.rawValue, removeOnCompletion: Bool = true, completion: ((Bool) -> ())? = nil) {
+        self.animate(from: NSNumber(value: Float(from)), to: NSNumber(value: Float(to)), keyPath: "strokeEnd", timingFunction: timingFunction, duration: duration, delay: delay, removeOnCompletion: removeOnCompletion, completion: completion)
+    }
+}
+
+final class RecordingProgressView: UIView {
+    let shapeLayer = SimpleShapeLayer()
+    
+    var value: CGFloat = 0.0 {
+        didSet {
+            if abs(self.shapeLayer.strokeEnd - self.value) >= 0.01 {
+                if abs(oldValue - self.value) < 0.1 {
+                    let previousStrokeEnd = self.shapeLayer.strokeEnd
+                    self.shapeLayer.strokeEnd = self.value
+                    self.shapeLayer.animateStrokeEnd(from: previousStrokeEnd, to: self.shapeLayer.strokeEnd, duration: abs(previousStrokeEnd - self.value) * 60.0, timingFunction: CAMediaTimingFunctionName.linear.rawValue)
+                } else {
+                    self.shapeLayer.strokeEnd = self.value
+                    self.shapeLayer.removeAllAnimations()
+                }
+            }
+        }
+    }
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        
+        self.shapeLayer.fillColor = UIColor.clear.cgColor
+        self.shapeLayer.strokeColor = UIColor(white: 1.0, alpha: 0.6).cgColor
+        self.shapeLayer.lineWidth = 4.0
+        self.shapeLayer.lineCap = .round
+        self.shapeLayer.transform = CATransform3DMakeRotation(-.pi / 2.0, 0.0, 0.0, 1.0)
+        self.shapeLayer.strokeEnd = 0.0
+        
+        self.layer.addSublayer(self.shapeLayer)
+    }
+    
+    required public init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        
+        if self.shapeLayer.frame != self.bounds {
+            self.shapeLayer.frame = self.bounds
+            
+            self.shapeLayer.path = CGPath(ellipseIn: self.bounds.insetBy(dx: self.shapeLayer.lineWidth, dy: self.shapeLayer.lineWidth), transform: nil)
+        }
+    }
+}