Start implementing FTUE splash screens.

Present splash screens from AuthenticationViewController

RiotSwiftUI/Modules/Onboarding/SplashScreen/View/OnboardingSplashScreen.swift

@@ -0,0 +1,111 @@
+// 
+// Copyright 2021 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
+
+@available(iOS 14.0, *)
+struct OnboardingSplashScreen: View {
+
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    @Environment(\.theme) private var theme: ThemeSwiftUI
+    
+    @State private var overlayFrame: CGRect = .zero
+    @State private var pageTimer: Timer?
+    
+    // MARK: Public
+    
+    @ObservedObject var viewModel: OnboardingSplashScreenViewModel.Context
+    
+    var buttons: some View {
+        VStack {
+            Button { viewModel.send(viewAction: .register) } label: {
+                Text(VectorL10n.onboardingSplashLoginButtonTitle)
+            }
+            .buttonStyle(PrimaryActionButtonStyle())
+            
+            Button { viewModel.send(viewAction: .login) } label: {
+                Text(VectorL10n.onboardingSplashRegisterButtonTitle)
+                    .padding(12)
+            }
+        }
+    }
+    
+    var overlay: some View {
+        VStack {
+            OnboardingSplashScreenPageIndicator(pageCount: viewModel.viewState.content.count,
+                                                pageIndex: viewModel.pageIndex)
+                .padding(.vertical, 20)
+            
+            buttons
+                .padding(.horizontal, 16)
+        }
+    }
+    
+    var body: some View {
+        GeometryReader { geometry in
+            // FIXME: The PageTabViewStyle breaks the safe area - replace with ScrollView or custom offsets
+            TabView(selection: $viewModel.pageIndex) {
+                OnboardingSplashScreenPage(content: viewModel.viewState.content[viewModel.viewState.content.count - 1],
+                                           overlayHeight: overlayFrame.height + geometry.safeAreaInsets.bottom)
+                    .tag(-1)
+                
+                ForEach(0..<viewModel.viewState.content.count, id:\.self) { index in
+                    let pageContent = viewModel.viewState.content[index]
+                    OnboardingSplashScreenPage(content: pageContent,
+                                               overlayHeight: overlayFrame.height + geometry.safeAreaInsets.bottom)
+                        .tag(index)
+                }
+            }
+            .tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))
+            .ignoresSafeArea()
+            .overlay(overlay
+                        .background(ViewFrameReader(frame: $overlayFrame))
+                        .padding(.bottom, geometry.safeAreaInsets.bottom > 0 ? 0 : 16),
+                     alignment: .bottom)
+            .accentColor(theme.colors.accent)
+            .onAppear {
+                pageTimer = Timer.scheduledTimer(withTimeInterval: 5, repeats: true) { timer in
+                    if viewModel.pageIndex == viewModel.viewState.content.count - 1 {
+                        viewModel.send(viewAction: .hiddenPage)
+                        
+                        withAnimation {
+                            viewModel.send(viewAction: .nextPage)
+                        }
+                    } else {
+                        withAnimation {
+                            viewModel.send(viewAction: .nextPage)
+                        }
+                    }
+                }
+            }
+        }
+        .navigationBarHidden(true)
+        .background(theme.colors.background.ignoresSafeArea())
+    }
+}
+
+// MARK: - Previews
+
+@available(iOS 14.0, *)
+struct OnboardingSplashScreen_Previews: PreviewProvider {
+    static let stateRenderer = MockOnboardingSplashScreenScreenState.stateRenderer
+    static var previews: some View {
+        stateRenderer.screenGroup()
+    }
+}

RiotSwiftUI/Modules/Onboarding/SplashScreen/View/OnboardingSplashScreenPage.swift

@@ -0,0 +1,84 @@
+// 
+// Copyright 2021 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
+
+@available(iOS 14.0, *)
+struct OnboardingSplashScreenPage: View {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    @Environment(\.theme) private var theme
+    
+    // MARK: Public
+    let content: OnboardingSplashScreenPageContent
+    let overlayHeight: CGFloat
+    
+    // MARK: - Views
+    
+    var title: some View {
+        Text(content.title)
+            + Text(".")
+            .foregroundColor(theme.colors.accent)
+    }
+    
+    var backgroundGradient: some View {
+        LinearGradient(gradient: content.gradient, startPoint: .leading, endPoint: .trailing)
+            .opacity(0.2)
+    }
+    
+    var body: some View {
+        VStack {
+            Spacer()
+            
+            Image(content.image.name)
+//                .resizable()
+//                .scaledToFit()
+//                .padding()
+            
+            Spacer()
+            
+            VStack(spacing: 8) {
+                title
+                    .font(theme.fonts.title2B)
+                    .foregroundColor(theme.colors.primaryContent)
+                Text(content.message)
+                    .font(theme.fonts.body)
+                    .foregroundColor(theme.colors.secondaryContent)
+                    .multilineTextAlignment(.center)
+            }
+            
+            Spacer()
+            
+            Spacer()
+                .frame(height: overlayHeight)
+        }
+        .padding(.horizontal, 16)
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+        .background(backgroundGradient.ignoresSafeArea())
+    }
+}
+
+@available(iOS 14.0, *)
+struct OnboardingSplashScreenPage_Previews: PreviewProvider {
+    static let content = OnboardingSplashScreenViewState().content
+    static var previews: some View {
+        ForEach(0..<content.count, id:\.self) { index in
+            OnboardingSplashScreenPage(content: content[index], overlayHeight: 55)
+        }
+    }
+}

RiotSwiftUI/Modules/Onboarding/SplashScreen/View/OnboardingSplashScreenPageIndicator.swift

@@ -0,0 +1,35 @@
+// 
+// Copyright 2021 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
+
+@available(iOS 14.0, *)
+struct OnboardingSplashScreenPageIndicator: View {
+    @Environment(\.theme) private var theme
+    
+    let pageCount: Int
+    let pageIndex: Int
+    
+    var body: some View {
+        HStack {
+            ForEach(0..<pageCount) { index in
+                Circle()
+                    .frame(width: 8, height: 8)
+                    .foregroundColor(index == pageIndex ? .accentColor : theme.colors.quarterlyContent)
+            }
+        }
+    }
+}