ios-mail/Modules/InboxCoreUI/Sources/LoadingBar/LoadingBar.swift

// Copyright (c) 2025 Proton Technologies AG
//
// This file is part of Proton Mail.
//
// Proton Mail is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Proton Mail is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Proton Mail. If not, see https://www.gnu.org/licenses/.

import SwiftUI

public struct LoadingBar: View {
    @EnvironmentObject var stateStore: LoadingBarStateStore

    public init() {}

    // MARK: - View

    public var body: some View {
        Group {
            if stateStore.isLoading {
                CyclingProgressBar()
                    .transition(.opacity)
            }
        }
        .animation(.easeInOut, value: stateStore.isLoading)
    }
}

public final class LoadingBarStateStore: ObservableObject {
    public enum Action {
        case startLoading
        case stopLoading
    }

    @Published fileprivate var isLoading: Bool = false

    public init() {}

    public func handle(action: Action) {
        switch action {
        case .startLoading:
            isLoading = true
        case .stopLoading:
            isLoading = false
        }
    }
}