session-ios/Session/Shared/LoadingIndicatorView.swift

// Copyright © 2023 Rangeproof Pty Ltd. All rights reserved.

import SwiftUI

public struct ActivityIndicator: View {
    @State private var isAnimating: Bool = false

    public var body: some View {
        GeometryReader { (geometry: GeometryProxy) in
            ForEach(0..<5) { index in
                Group {
                    Circle()
                        .frame(
                            width: geometry.size.width / 5,
                            height: geometry.size.height / 5
                        )
                        .scaleEffect(!self.isAnimating ? 1 - CGFloat(index) / 5 : 0.2 + CGFloat(index) / 5)
                        .offset(y: geometry.size.width / 10 - geometry.size.height / 2)
                }
                .frame(
                    width: geometry.size.width,
                    height: geometry.size.height
                )
                .rotationEffect(!self.isAnimating ? .degrees(0) : .degrees(360))
                .animation(Animation
                    .timingCurve(0.5, 0.15 + Double(index) / 5, 0.25, 1, duration: 1.5)
                    .repeatForever(autoreverses: false)
                )
            }
        }
        .aspectRatio(1, contentMode: .fit)
        .onAppear {
            self.isAnimating = true
        }
    }
}