Rename screens (#826)

* Rename: AnalyticsPrompt -> AnalyticsPromptScreen * Rename: AnalyticsSettings -> AnalyticsSettingsScreen * Rename: Settings -> SettingsScreen * Rename: SessionVerification -> SessionVerificationScreen * Rename: BugReport -> BugReportScreen * Rename: FilePreview -> FilePreviewScreen * Rename: AnalyticsPrompt -> AnalyticsPromptScreen * Rename: Invites -> InvitesScreen * Rename: InviteUsers -> InviteUsersScreen * Rename: MediaPicker -> MediaPickerScreen * Delete unused UIActivityViewControllerWrapper * Rename: ReportContent -> ReportContentScreen * Rename: RoomDetails -> RoomDetailsScreen * Rename: RoomMemberDetails -> RoomMemberDetailsScreen * Rename: RoomMemberList -> RoomMemberListScreen * Rename: Cleanup * Renaming missed items * Low effort attempt at fixing the flakey unit tests
2026-11-02 21:33:26 +00:00 · 2023-04-24 18:48:07 +03:00
parent 9911ad2b9b
commit 24572c6582
88 changed files with 492 additions and 520 deletions
@@ -0,0 +1,51 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+struct SessionVerificationScreenCoordinatorParameters {
+    let sessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol
+}
+
+final class SessionVerificationScreenCoordinator: CoordinatorProtocol {
+    private let parameters: SessionVerificationScreenCoordinatorParameters
+    private var viewModel: SessionVerificationScreenViewModelProtocol
+    
+    var callback: (() -> Void)?
+    
+    init(parameters: SessionVerificationScreenCoordinatorParameters) {
+        self.parameters = parameters
+        
+        viewModel = SessionVerificationScreenViewModel(sessionVerificationControllerProxy: parameters.sessionVerificationControllerProxy)
+    }
+    
+    // MARK: - Public
+    
+    func start() {
+        viewModel.callback = { [weak self] action in
+            guard let self else { return }
+            
+            switch action {
+            case .finished:
+                self.callback?()
+            }
+        }
+    }
+    
+    func toPresentable() -> AnyView {
+        AnyView(SessionVerificationScreen(context: viewModel.context))
+    }
+}
@@ -0,0 +1,88 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+enum SessionVerificationScreenViewModelAction {
+    case finished
+}
+
+struct SessionVerificationScreenViewState: BindableState {
+    var verificationState: SessionVerificationScreenStateMachine.State = .initial
+    
+    var title: String? {
+        switch verificationState {
+        case .initial:
+            return L10n.screenSessionVerificationOpenExistingSessionTitle
+        case .requestingVerification:
+            return L10n.screenSessionVerificationWaitingToAcceptTitle
+        case .verificationRequestAccepted:
+            return L10n.screenSessionVerificationCompareEmojisTitle
+        case .startingSasVerification:
+            return nil
+        case .sasVerificationStarted:
+            return nil
+        case .showingChallenge:
+            return L10n.screenSessionVerificationCompareEmojisTitle
+        case .acceptingChallenge:
+            return L10n.screenSessionVerificationCompareEmojisTitle
+        case .decliningChallenge:
+            return nil
+        case .verified:
+            return L10n.commonVerificationComplete
+        case .cancelling:
+            return nil
+        case .cancelled:
+            return L10n.commonVerificationCancelled
+        }
+    }
+        
+    var message: String {
+        switch verificationState {
+        case .initial:
+            return L10n.screenSessionVerificationOpenExistingSessionSubtitle
+        case .requestingVerification:
+            return L10n.screenSessionVerificationWaitingToAcceptSubtitle
+        case .verificationRequestAccepted:
+            return L10n.screenSessionVerificationRequestAcceptedSubtitle
+        case .startingSasVerification:
+            return L10n.commonWaiting
+        case .sasVerificationStarted:
+            return L10n.commonWaiting
+        case .acceptingChallenge:
+            return L10n.screenSessionVerificationCompareEmojisSubtitle
+        case .decliningChallenge:
+            return L10n.commonWaiting
+        case .cancelling:
+            return L10n.commonWaiting
+        case .showingChallenge:
+            return L10n.screenSessionVerificationCompareEmojisSubtitle
+        case .verified:
+            return L10n.screenSessionVerificationCompleteSubtitle
+        case .cancelled:
+            return L10n.screenSessionVerificationCancelledSubtitle
+        }
+    }
+}
+
+enum SessionVerificationScreenViewAction {
+    case requestVerification
+    case startSasVerification
+    case restart
+    case accept
+    case decline
+    case close
+}
@@ -0,0 +1,149 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import SwiftState
+
+class SessionVerificationScreenStateMachine {
+    /// States the SessionVerificationViewModel can find itself in
+    enum State: StateType {
+        /// The initial state, before verification started
+        case initial
+        /// Waiting for verification acceptance
+        case requestingVerification
+        /// Verification request accepted. Waiting for start
+        case verificationRequestAccepted
+        /// Waiting for SaS verification start
+        case startingSasVerification
+        /// A SaS verification flow has been started
+        case sasVerificationStarted
+        /// Verification accepted and emojis received
+        case showingChallenge(emojis: [SessionVerificationEmoji])
+        /// Emojis match locally
+        case acceptingChallenge(emojis: [SessionVerificationEmoji])
+        /// Emojis do not match locally
+        case decliningChallenge(emojis: [SessionVerificationEmoji])
+        /// Verification successful
+        case verified
+        /// User requested verification cancellation
+        case cancelling
+        /// The verification has been cancelled, remotely or locally
+        case cancelled
+    }
+    
+    /// Events that can be triggered on the SessionVerification state machine
+    enum Event: EventType {
+        /// Request verification
+        case requestVerification
+        /// The current verification request has been accepted
+        case didAcceptVerificationRequest
+        /// Start a SaS verification flow
+        case startSasVerification
+        /// Started a SaS verification flow
+        case didStartSasVerification
+        /// Has received emojis
+        case didReceiveChallenge(emojis: [SessionVerificationEmoji])
+        /// Emojis match
+        case acceptChallenge
+        /// Emojis do not match
+        case declineChallenge
+        /// Remote accepted challenge
+        case didAcceptChallenge
+        /// Request cancellation
+        case cancel
+        /// Verification cancelled
+        case didCancel
+        /// Request failed
+        case didFail
+        /// Restart the verification flow
+        case restart
+    }
+    
+    private let stateMachine: StateMachine<State, Event>
+    
+    var state: State {
+        stateMachine.state
+    }
+
+    init() {
+        stateMachine = StateMachine(state: .initial)
+        configure()
+    }
+    
+    // swiftlint:disable:next cyclomatic_complexity
+    private func configure() {
+        stateMachine.addRoutes(event: .requestVerification, transitions: [.initial => .requestingVerification])
+        stateMachine.addRoutes(event: .didAcceptVerificationRequest, transitions: [.requestingVerification => .verificationRequestAccepted])
+        stateMachine.addRoutes(event: .startSasVerification, transitions: [.verificationRequestAccepted => .startingSasVerification])
+        stateMachine.addRoutes(event: .didFail, transitions: [.requestingVerification => .initial])
+        stateMachine.addRoutes(event: .restart, transitions: [.cancelled => .initial])
+        
+        // Transitions with associated values need to be handled through `addRouteMapping`
+        stateMachine.addRouteMapping { event, fromState, _ in
+            switch (event, fromState) {
+            case (.didStartSasVerification, _):
+                return .sasVerificationStarted
+                
+            case (.didReceiveChallenge(let emojis), .sasVerificationStarted):
+                return .showingChallenge(emojis: emojis)
+            case (.acceptChallenge, .showingChallenge(let emojis)):
+                return .acceptingChallenge(emojis: emojis)
+            case (.didFail, .acceptingChallenge(let emojis)):
+                return .showingChallenge(emojis: emojis)
+                
+            case (.didAcceptChallenge, .acceptingChallenge):
+                return .verified
+                
+            case (.declineChallenge, .showingChallenge(let emojis)):
+                return .decliningChallenge(emojis: emojis)
+            case (.didFail, .decliningChallenge(let emojis)):
+                return .showingChallenge(emojis: emojis)
+                
+            case (.cancel, _):
+                return .cancelling
+            case (.didCancel, _):
+                return .cancelled
+                
+            default:
+                return nil
+            }
+        }
+        
+        addTransitionHandler { context in
+            if let event = context.event {
+                MXLog.info("Transitioning from `\(context.fromState)` to `\(context.toState)` with event `\(event)`")
+            } else {
+                MXLog.info("Transitioning from \(context.fromState)` to `\(context.toState)`")
+            }
+        }
+    }
+    
+    /// Attempt to move the state machine to another state through an event
+    /// It will either invoke the `transitionHandler` or the `errorHandler` depending on its current state
+    func processEvent(_ event: Event) {
+        stateMachine.tryEvent(event)
+    }
+    
+    /// Registers a callback for processing state machine transitions
+    func addTransitionHandler(_ handler: @escaping StateMachine<State, Event>.Handler) {
+        stateMachine.addAnyHandler(.any => .any, handler: handler)
+    }
+    
+    /// Registers a callback for processing state machine errors
+    func addErrorHandler(_ handler: @escaping StateMachine<State, Event>.Handler) {
+        stateMachine.addErrorHandler(handler: handler)
+    }
+}
@@ -0,0 +1,182 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+typealias SessionVerificationViewModelType = StateStoreViewModel<SessionVerificationScreenViewState, SessionVerificationScreenViewAction>
+
+class SessionVerificationScreenViewModel: SessionVerificationViewModelType, SessionVerificationScreenViewModelProtocol {
+    private let sessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol
+    
+    private var stateMachine: SessionVerificationScreenStateMachine
+
+    var callback: ((SessionVerificationScreenViewModelAction) -> Void)?
+
+    init(sessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol,
+         initialState: SessionVerificationScreenViewState = SessionVerificationScreenViewState()) {
+        self.sessionVerificationControllerProxy = sessionVerificationControllerProxy
+        
+        stateMachine = SessionVerificationScreenStateMachine()
+        
+        super.init(initialViewState: initialState)
+        
+        setupStateMachine()
+        
+        sessionVerificationControllerProxy.callbacks
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] callback in
+                guard let self else { return }
+                
+                switch callback {
+                case .acceptedVerificationRequest:
+                    self.stateMachine.processEvent(.didAcceptVerificationRequest)
+                case .startedSasVerification:
+                    self.stateMachine.processEvent(.didStartSasVerification)
+                case .receivedVerificationData(let emojis):
+                    guard self.stateMachine.state == .sasVerificationStarted else {
+                        MXLog.warning("Callbacks: Ignoring receivedVerificationData due to invalid state.")
+                        return
+                    }
+                    
+                    self.stateMachine.processEvent(.didReceiveChallenge(emojis: emojis))
+                case .finished:
+                    self.stateMachine.processEvent(.didAcceptChallenge)
+                case .cancelled:
+                    self.stateMachine.processEvent(.didCancel)
+                case .failed:
+                    self.stateMachine.processEvent(.didFail)
+                }
+            }
+            .store(in: &cancellables)
+    }
+    
+    override func process(viewAction: SessionVerificationScreenViewAction) {
+        switch viewAction {
+        case .requestVerification:
+            stateMachine.processEvent(.requestVerification)
+        case .startSasVerification:
+            stateMachine.processEvent(.startSasVerification)
+        case .restart:
+            stateMachine.processEvent(.restart)
+        case .close:
+            guard stateMachine.state == .initial ||
+                stateMachine.state == .verified ||
+                stateMachine.state == .cancelled else {
+                stateMachine.processEvent(.cancel)
+                return
+            }
+            
+            callback?(.finished)
+        case .accept:
+            stateMachine.processEvent(.acceptChallenge)
+        case .decline:
+            stateMachine.processEvent(.declineChallenge)
+        }
+    }
+    
+    // MARK: - Private
+    
+    private func setupStateMachine() {
+        stateMachine.addTransitionHandler { [weak self] context in
+            guard let self else { return }
+                
+            self.state.verificationState = context.toState
+            
+            switch (context.fromState, context.event, context.toState) {
+            case (.initial, .requestVerification, .requestingVerification):
+                self.requestVerification()
+            case (.verificationRequestAccepted, .startSasVerification, .startingSasVerification):
+                self.startSasVerification()
+            case (.showingChallenge, .acceptChallenge, .acceptingChallenge):
+                self.acceptChallenge()
+            case (.showingChallenge, .declineChallenge, .decliningChallenge):
+                self.declineChallenge()
+            case (_, .cancel, .cancelling):
+                self.cancelVerification()
+            case (_, _, .verified):
+                // Dismiss the success screen automatically.
+                Task {
+                    try await Task.sleep(for: .seconds(2))
+                    self.callback?(.finished)
+                }
+            default:
+                break
+            }
+        }
+        
+        stateMachine.addErrorHandler { context in
+            MXLog.error("Failed transition with context: \(context)")
+        }
+    }
+    
+    private func requestVerification() {
+        Task {
+            switch await sessionVerificationControllerProxy.requestVerification() {
+            case .success:
+                // Need to wait for the callback from the remote
+                break
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+    
+    private func cancelVerification() {
+        Task {
+            switch await sessionVerificationControllerProxy.cancelVerification() {
+            case .success:
+                stateMachine.processEvent(.didCancel)
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+    
+    private func startSasVerification() {
+        Task {
+            switch await sessionVerificationControllerProxy.startSasVerification() {
+            case .success:
+                // Need to wait for the callback from the remote
+                break
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+    
+    private func acceptChallenge() {
+        Task {
+            switch await sessionVerificationControllerProxy.approveVerification() {
+            case .success:
+                // Need to wait for the callback from the remote
+                break
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+    
+    private func declineChallenge() {
+        Task {
+            switch await sessionVerificationControllerProxy.declineVerification() {
+            case .success:
+                stateMachine.processEvent(.didCancel)
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+}
@@ -0,0 +1,23 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+@MainActor
+protocol SessionVerificationScreenViewModelProtocol {
+    var callback: ((SessionVerificationScreenViewModelAction) -> Void)? { get set }
+    var context: SessionVerificationViewModelType.Context { get }
+}
@@ -0,0 +1,254 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+struct SessionVerificationScreen: View {
+    @ObservedObject var context: SessionVerificationScreenViewModel.Context
+    
+    var body: some View {
+        NavigationStack {
+            ScrollView {
+                VStack(spacing: 32) {
+                    screenHeader
+                    Spacer()
+                    mainContent
+                }
+                .padding(.horizontal, 16)
+                .padding(.top, 24)
+                .frame(maxWidth: .infinity)
+                .navigationBarTitleDisplayMode(.inline)
+                .toolbar { toolbarContent }
+            }
+            .background(Color.element.background.ignoresSafeArea())
+            .safeAreaInset(edge: .bottom) { actionButtons.padding() }
+        }
+        .interactiveDismissDisabled() // Make sure dismissal goes through the state machine(s).
+    }
+    
+    // MARK: - Private
+    
+    private var headerImageName: String {
+        switch context.viewState.verificationState {
+        case .initial:
+            return "macbook.and.iphone"
+        case .cancelled:
+            return "exclamationmark.shield"
+        case .requestingVerification:
+            return "hourglass"
+        case .verificationRequestAccepted:
+            return "face.smiling"
+        case .startingSasVerification:
+            return "hourglass"
+        case .sasVerificationStarted:
+            return "hourglass"
+        case .cancelling:
+            return "hourglass"
+        case .acceptingChallenge:
+            return "hourglass"
+        case .decliningChallenge:
+            return "hourglass"
+        case .showingChallenge:
+            return "face.smiling"
+        case .verified:
+            return "checkmark.shield"
+        }
+    }
+    
+    @ViewBuilder
+    private var screenHeader: some View {
+        VStack(spacing: 0) {
+            AuthenticationIconImage(image: Image(systemName: headerImageName))
+                .padding(.bottom, 16)
+            
+            Text(context.viewState.title ?? "")
+                .font(.title2.bold())
+                .multilineTextAlignment(.center)
+                .foregroundColor(.element.primaryContent)
+                .padding(.bottom, 8)
+
+            Text(context.viewState.message)
+                .font(.subheadline)
+                .multilineTextAlignment(.center)
+                .foregroundColor(.element.tertiaryContent)
+        }
+    }
+    
+    @ViewBuilder
+    private var mainContent: some View {
+        switch context.viewState.verificationState {
+        case .showingChallenge(let emojis):
+            emojisPanel(with: emojis)
+                .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.emojiWrapper)
+        case .acceptingChallenge(let emojis):
+            emojisPanel(with: emojis)
+                .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.emojiWrapper)
+        case .requestingVerification:
+            ProgressView()
+                .tint(.element.secondaryContent)
+                .scaleEffect(2)
+        default:
+            // In All other cases, we just want an empty view
+            EmptyView()
+        }
+    }
+    
+    @ViewBuilder
+    private func emojisPanel(with emojis: [SessionVerificationEmoji]) -> some View {
+        VStack(spacing: 32) {
+            HStack(spacing: 16) {
+                ForEach(emojis.prefix(4), id: \.self) { emoji in
+                    EmojiView(emoji: emoji)
+                }
+            }
+            HStack(spacing: 16) {
+                ForEach(emojis.suffix(from: 4), id: \.self) { emoji in
+                    EmojiView(emoji: emoji)
+                }
+            }
+        }
+    }
+    
+    @ViewBuilder
+    private var actionButtons: some View {
+        switch context.viewState.verificationState {
+        case .initial:
+            Button(L10n.actionStartVerification) {
+                context.send(viewAction: .requestVerification)
+            }
+            .buttonStyle(.elementAction(.xLarge))
+            .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.requestVerification)
+        
+        case .cancelled:
+            Button(L10n.actionRetry) {
+                context.send(viewAction: .restart)
+            }
+            .buttonStyle(.elementAction(.xLarge))
+            
+        case .verificationRequestAccepted:
+            Button(L10n.actionStart) {
+                context.send(viewAction: .startSasVerification)
+            }
+            .buttonStyle(.elementAction(.xLarge))
+            .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.startSasVerification)
+        
+        case .showingChallenge:
+            VStack(spacing: 30) {
+                Button { context.send(viewAction: .accept) } label: {
+                    Label(L10n.screenSessionVerificationTheyMatch, systemImage: "checkmark")
+                }
+                .buttonStyle(.elementAction(.xLarge))
+                .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.acceptChallenge)
+                
+                Button(L10n.screenSessionVerificationTheyDontMatch) {
+                    context.send(viewAction: .decline)
+                }
+                .font(.element.bodyBold)
+                .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.declineChallenge)
+            }
+            
+        case .acceptingChallenge:
+            VStack(spacing: 30) {
+                Button { context.send(viewAction: .accept) } label: {
+                    HStack(spacing: 16) {
+                        ProgressView()
+                            .tint(.element.background)
+                        Label(L10n.screenSessionVerificationTheyMatch, systemImage: "checkmark")
+                    }
+                }
+                .buttonStyle(.elementAction(.xLarge))
+                .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.acceptChallenge)
+                .disabled(true)
+
+                Button(L10n.screenSessionVerificationTheyDontMatch) {
+                    context.send(viewAction: .decline)
+                }
+                .font(.element.bodyBold)
+                .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.declineChallenge)
+                .disabled(true)
+            }
+
+        default:
+            EmptyView()
+        }
+    }
+    
+    @ToolbarContentBuilder
+    private var toolbarContent: some ToolbarContent {
+        ToolbarItem(placement: .cancellationAction) {
+            Button(L10n.actionCancel) {
+                context.send(viewAction: .close)
+            }
+            .foregroundColor(.element.accent)
+            .accessibilityIdentifier(A11yIdentifiers.sessionVerificationScreen.close)
+        }
+    }
+    
+    struct EmojiView: View {
+        let emoji: SessionVerificationEmoji
+        
+        var body: some View {
+            VStack(spacing: 16.0) {
+                Text(emoji.symbol)
+                    .font(.element.largeTitleBold)
+                Text(emoji.description)
+                    .font(.element.subheadline)
+                    .foregroundColor(.element.secondaryContent)
+            }
+            .padding(8.0)
+        }
+    }
+    
+    struct StateIcon: View {
+        let systemName: String
+        
+        var body: some View {
+            Image(systemName: systemName)
+                .resizable()
+                .font(.element.body.weight(.light))
+                .scaledToFit()
+                .foregroundColor(.element.accent)
+                .frame(width: 100, height: 100)
+        }
+    }
+}
+
+// MARK: - Previews
+
+struct SessionVerification_Previews: PreviewProvider {
+    static var previews: some View {
+        sessionVerificationScreen(state: .initial)
+            .previewDisplayName("Initial")
+        sessionVerificationScreen(state: .requestingVerification)
+            .previewDisplayName("Requesting Verification")
+        sessionVerificationScreen(state: .verificationRequestAccepted)
+            .previewDisplayName("Request Accepted")
+        sessionVerificationScreen(state: .cancelled)
+            .previewDisplayName("Cancelled")
+        
+        sessionVerificationScreen(state: .showingChallenge(emojis: SessionVerificationControllerProxyMock.emojis))
+            .previewDisplayName("Showing Challenge")
+        sessionVerificationScreen(state: .verified)
+            .previewDisplayName("Verified")
+    }
+    
+    static func sessionVerificationScreen(state: SessionVerificationScreenStateMachine.State) -> some View {
+        let viewModel = SessionVerificationScreenViewModel(sessionVerificationControllerProxy: SessionVerificationControllerProxyMock.configureMock(),
+                                                           initialState: SessionVerificationScreenViewState(verificationState: state))
+        
+        return SessionVerificationScreen(context: viewModel.context)
+    }
+}