metatext-app-ios-iphone-ipad/Views/TabNavigationView.swift

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Swift
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// Copyright © 2020 Metabolist. All rights reserved.
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import KingfisherSwiftUI
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import enum Mastodon.Timeline
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import SwiftUI
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import ViewModels
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struct TabNavigationView: View {
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@ObservedObject var viewModel: NavigationViewModel
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@EnvironmentObject var rootViewModel: RootViewModel
@Environment(\.displayScale) var displayScale: CGFloat
var body: some View {
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TabView(selection: $viewModel.selectedTab) {
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ForEach(viewModel.tabs) { tab in
NavigationView {
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view(tab: tab)
}
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.navigationViewStyle(StackNavigationViewStyle())
.tabItem {
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Label(tab.title, systemImage: tab.systemImageName)
.accessibility(label: Text(tab.title))
}
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.tag(tab)
}
}
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.environmentObject(viewModel.identification)
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.sheet(isPresented: $viewModel.presentingSecondaryNavigation) {
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SecondaryNavigationView(viewModel: viewModel)
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.environmentObject(viewModel)
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.environmentObject(rootViewModel)
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}
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.alertItem($viewModel.alertItem)
.onAppear(perform: viewModel.refreshIdentity)
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.onReceive(NotificationCenter.default
.publisher(for: UIScene.willEnterForegroundNotification)
.map { _ in () },
perform: viewModel.refreshIdentity)
}
}
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private extension TabNavigationView {
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@ViewBuilder
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func view(tab: NavigationViewModel.Tab) -> some View {
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switch tab {
case .timelines:
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StatusListView(viewModel: viewModel.viewModel(timeline: viewModel.timeline))
.id(viewModel.timeline.id)
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.edgesIgnoringSafeArea(.all)
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.navigationBarTitle(viewModel.timeline.title, displayMode: .inline)
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.toolbar {
ToolbarItem(placement: .principal) {
VStack {
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Text(viewModel.timeline.title)
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.font(.headline)
Text(viewModel.timelineSubtitle)
.font(.footnote)
.foregroundColor(.secondary)
}
}
}
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.navigationBarItems(
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leading: secondaryNavigationButton,
trailing: Menu {
ForEach(viewModel.timelinesAndLists) { timeline in
Button {
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viewModel.timeline = timeline
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} label: {
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Label(timeline.title,
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systemImage: timeline.systemImageName)
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}
}
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} label: {
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Image(systemName: viewModel.timeline.systemImageName)
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})
default: Text(tab.title)
}
}
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@ViewBuilder
var secondaryNavigationButton: some View {
Button {
viewModel.presentingSecondaryNavigation.toggle()
} label: {
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KFImage(viewModel.identification.identity.image,
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options: .downsampled(dimension: 28, scaleFactor: displayScale))
.placeholder { Image(systemName: "gear") }
.renderingMode(.original)
.contextMenu(ContextMenu {
ForEach(viewModel.recentIdentities) { recentIdentity in
Button {
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rootViewModel.identitySelected(id: recentIdentity.id)
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} label: {
Label(
title: { Text(recentIdentity.handle) },
icon: {
KFImage(recentIdentity.image,
options: .downsampled(dimension: 28, scaleFactor: displayScale))
.renderingMode(.original)
})
}
}
})
}
}
}
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private extension Timeline {
var title: String {
switch self {
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case .home:
return NSLocalizedString("timelines.home", comment: "")
case .local:
return NSLocalizedString("timelines.local", comment: "")
case .federated:
return NSLocalizedString("timelines.federated", comment: "")
case let .list(list):
return list.title
case let .tag(tag):
return "#" + tag
}
}
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var systemImageName: String {
switch self {
case .home: return "house"
case .local: return "person.3"
case .federated: return "globe"
case .list: return "scroll"
case .tag: return "number"
}
}
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}
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extension NavigationViewModel.Tab {
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var title: String {
switch self {
case .timelines: return "Timelines"
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case .explore: return "Explore"
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case .notifications: return "Notifications"
case .messages: return "Messages"
}
}
var systemImageName: String {
switch self {
case .timelines: return "newspaper"
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case .explore: return "magnifyingglass"
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case .notifications: return "bell"
case .messages: return "envelope"
}
}
}
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#if DEBUG
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import PreviewViewModels
struct TabNavigation_Previews: PreviewProvider {
static var previews: some View {
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TabNavigationView(viewModel: NavigationViewModel(identification: .preview))
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.environmentObject(Identification.preview)
.environmentObject(RootViewModel.preview)
}
}
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#endif