space-ios/iOSClient/Extensions/View+Extension.swift

//
//  View+Extension.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 29/12/22.
//  Copyright © 2022 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
//  This program 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.
//
//  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
//

import SwiftUI

extension View {
    func complexModifier<V: View>(@ViewBuilder _ closure: (Self) -> V) -> some View {
        closure(self)
    }

    /// Use this on preview views that are used in snapshot testing. It prevents the snapashot library from complaining that the view has a size of 0
    /// Check: https://github.com/pointfreeco/swift-snapshot-testing/issues/738
    func frameForPreview() -> some View {
        return frame(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
    }

    func hiddenConditionally(isHidden: Bool) -> some View {
        isHidden ? AnyView(self.hidden()) : AnyView(self)
    }

    /// Applies the given transform if the given condition evaluates to `true`.
    /// - Parameters:
    ///   - condition: The condition to evaluate.
    ///   - transform: The transform to apply to the source `View`.
    /// - Returns: Either the original `View` or the modified `View` if the condition is `true`.
    @ViewBuilder func `if`<Content: View>(_ condition: Bool, transform: (Self) -> Content) -> some View {
        if condition {
            transform(self)
        } else {
            self
        }
    }

    func onFirstAppear(perform action: @escaping () -> Void) -> some View {
        modifier(ViewFirstAppearModifier(perform: action))
    }
}

struct ViewFirstAppearModifier: ViewModifier {
    @State private var didAppearBefore = false
    private let action: () -> Void

    init(perform action: @escaping () -> Void) {
        self.action = action
    }

    func body(content: Content) -> some View {
        content.onAppear {
            guard !didAppearBefore else { return }
            didAppearBefore = true
            action()
        }
    }
}

var isRunningForPreviews: Bool {
    return ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"
}