mirror of
https://github.com/vector-im/element-ios.git
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206 lines
7.5 KiB
Swift
206 lines
7.5 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import SwiftUI
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/// The splash screen shown at the beginning of the onboarding flow.
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struct OnboardingSplashScreen: View {
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// MARK: - Properties
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// MARK: Private
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@Environment(\.theme) private var theme
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@Environment(\.layoutDirection) private var layoutDirection
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private var isLeftToRight: Bool { layoutDirection == .leftToRight }
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private var pageCount: Int { viewModel.viewState.content.count }
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/// The dimensions of the stack with the action buttons and page indicator.
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@State private var overlayFrame: CGRect = .zero
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/// A timer to automatically animate the pages.
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@State private var pageTimer: Timer?
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/// The amount of offset to apply when a drag gesture is in progress.
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@State private var dragOffset: CGFloat = .zero
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// MARK: Public
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@ObservedObject var viewModel: OnboardingSplashScreenViewModel.Context
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/// The main action buttons.
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var buttons: some View {
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VStack(spacing: 12) {
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Button { viewModel.send(viewAction: .register) } label: {
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Text(VectorL10n.onboardingSplashRegisterButtonTitle)
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}
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.buttonStyle(PrimaryActionButtonStyle())
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Button { viewModel.send(viewAction: .login) } label: {
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Text(VectorL10n.onboardingSplashLoginButtonTitle)
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.font(theme.fonts.body)
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.padding(12)
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}
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}
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}
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/// The only part of the UI that isn't inside of the carousel.
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var overlay: some View {
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VStack(spacing: 50) {
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Color.clear
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Color.clear
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VStack {
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OnboardingSplashScreenPageIndicator(pageCount: pageCount,
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pageIndex: viewModel.pageIndex)
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Spacer()
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buttons
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.padding(.horizontal, 16)
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.frame(maxWidth: OnboardingMetrics.maxContentWidth)
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Spacer()
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}
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.background(ViewFrameReader(frame: $overlayFrame))
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}
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}
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var body: some View {
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GeometryReader { geometry in
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ZStack(alignment: .leading) {
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// The main content of the carousel
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HStack(spacing: 0) {
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// Add a hidden page at the start of the carousel duplicating the content of the last page
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OnboardingSplashScreenPage(content: viewModel.viewState.content[pageCount - 1],
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overlayHeight: overlayFrame.height + geometry.safeAreaInsets.bottom)
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.frame(width: geometry.size.width)
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.tag(-1)
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ForEach(0..<pageCount) { index in
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OnboardingSplashScreenPage(content: viewModel.viewState.content[index],
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overlayHeight: overlayFrame.height + geometry.safeAreaInsets.bottom)
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.frame(width: geometry.size.width)
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.tag(index)
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}
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}
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.offset(x: (CGFloat(viewModel.pageIndex + 1) * -geometry.size.width) + dragOffset)
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.gesture(
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DragGesture()
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.onChanged(handleDragGestureChange)
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.onEnded { handleDragGestureEnded($0, viewSize: geometry.size) }
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)
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overlay
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.frame(width: geometry.size.width)
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}
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}
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.background(theme.colors.background.ignoresSafeArea())
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.accentColor(theme.colors.accent)
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.navigationBarHidden(true)
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.onAppear {
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startTimer()
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}
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.onDisappear { stopTimer() }
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.track(screen: .welcome)
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}
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// MARK: - Animation
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/// Starts the animation timer for an automatic carousel effect.
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private func startTimer() {
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guard pageTimer == nil else { return }
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pageTimer = Timer.scheduledTimer(withTimeInterval: 5, repeats: true) { timer in
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if viewModel.pageIndex == pageCount - 1 {
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viewModel.send(viewAction: .hiddenPage)
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withAnimation(.easeInOut(duration: 0.7)) {
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viewModel.send(viewAction: .nextPage)
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}
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} else {
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withAnimation(.easeInOut(duration: 0.7)) {
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viewModel.send(viewAction: .nextPage)
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}
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}
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}
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}
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/// Stops the animation timer for manual interaction.
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private func stopTimer() {
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guard let pageTimer = pageTimer else { return }
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self.pageTimer = nil
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pageTimer.invalidate()
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}
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// MARK: - Gestures
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/// Whether or not a drag gesture is valid or not.
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/// - Parameter width: The gesture's translation width.
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/// - Returns: `true` if there is another page to drag to.
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private func shouldSwipeForTranslation(_ width: CGFloat) -> Bool {
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if viewModel.pageIndex == 0 {
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return isLeftToRight ? width < 0 : width > 0
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} else if viewModel.pageIndex == pageCount - 1 {
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return isLeftToRight ? width > 0 : width < 0
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}
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return true
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}
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/// Updates the `dragOffset` based on the gesture's value.
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/// - Parameter drag: The drag gesture value to handle.
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private func handleDragGestureChange(_ drag: DragGesture.Value) {
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guard shouldSwipeForTranslation(drag.translation.width) else { return }
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stopTimer()
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// Animate the change over a few frames to smooth out any stuttering.
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withAnimation(.linear(duration: 0.05)) {
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dragOffset = isLeftToRight ? drag.translation.width : -drag.translation.width
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}
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}
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/// Clears the drag offset and informs the view model to switch to another page if necessary.
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/// - Parameter viewSize: The size of the view in which the gesture took place.
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private func handleDragGestureEnded(_ drag: DragGesture.Value, viewSize: CGSize) {
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guard shouldSwipeForTranslation(drag.predictedEndTranslation.width) else {
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// Reset the offset just in case.
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withAnimation { dragOffset = 0 }
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return
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}
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withAnimation(.easeInOut(duration: 0.2)) {
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if drag.predictedEndTranslation.width < -viewSize.width / 2 {
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viewModel.send(viewAction: .nextPage)
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} else if drag.predictedEndTranslation.width > viewSize.width / 2 {
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viewModel.send(viewAction: .previousPage)
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}
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dragOffset = 0
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}
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}
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}
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// MARK: - Previews
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struct OnboardingSplashScreen_Previews: PreviewProvider {
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static let stateRenderer = MockOnboardingSplashScreenScreenState.stateRenderer
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static var previews: some View {
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stateRenderer.screenGroup()
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}
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}
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