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CollectionListView.swift
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CollectionListView.swift
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import SwiftUI
struct CollectionListView: View {
@EnvironmentObject var model: WriteFreelyModel
@AppStorage("showAllPostsFlag") var showAllPostsFlag: Bool = false
@AppStorage("selectedCollectionURL") var selectedCollectionURL: URL?
@FetchRequest(
entity: WFACollection.entity(),
sortDescriptors: [NSSortDescriptor(keyPath: \WFACollection.title, ascending: true)]
) var collections: FetchedResults<WFACollection>
var body: some View {
List(selection: $model.selectedCollection) {
if model.account.isLoggedIn {
NavigationLink(
destination: PostListView(),
isActive: Binding<Bool>(
get: { () -> Bool in
model.selectedCollection == nil && model.showAllPosts
}, set: { newValue in
if newValue {
self.model.showAllPosts = true
self.model.selectedCollection = nil
} else {
// No-op
}
}
),
label: {
Text("All Posts")
})
NavigationLink(
destination: PostListView(),
isActive: Binding<Bool>(
get: { () -> Bool in
model.selectedCollection == nil && !model.showAllPosts
}, set: { newValue in
if newValue {
self.model.showAllPosts = false
self.model.selectedCollection = nil
} else {
// No-op
}
}
),
label: {
Text(model.account.server == "https://write.as" ? "Anonymous" : "Drafts")
})
Section(header: Text("Your Blogs")) {
ForEach(collections, id: \.self) { collection in
NavigationLink(
destination: PostListView(),
isActive: Binding<Bool>(
get: { () -> Bool in
model.selectedCollection == collection && !model.showAllPosts
}, set: { newValue in
if newValue {
self.model.showAllPosts = false
self.model.selectedCollection = collection
} else {
// No-op
}
}
),
label: { Text(collection.title) }
)
}
}
} else {
NavigationLink(destination: PostListView()) {
Text("Drafts")
}
}
}
.navigationTitle(
model.account.isLoggedIn ? "\(URL(string: model.account.server)?.host ?? "WriteFreely")" : "WriteFreely"
)
.listStyle(SidebarListStyle())
.onAppear(perform: {
#if os(iOS)
DispatchQueue.main.async {
self.model.showAllPosts = showAllPostsFlag
self.model.selectedCollection = fetchSelectedCollectionFromAppStorage()
}
#endif
})
.onChange(of: model.selectedCollection) { collection in
if collection != fetchSelectedCollectionFromAppStorage() {
self.selectedCollectionURL = collection?.objectID.uriRepresentation()
}
}
.onChange(of: model.showAllPosts) { value in
if value != showAllPostsFlag {
self.showAllPostsFlag = model.showAllPosts
}
}
}
private func fetchSelectedCollectionFromAppStorage() -> WFACollection? {
guard let objectURL = selectedCollectionURL else { return nil }
let coordinator = LocalStorageManager.persistentContainer.persistentStoreCoordinator
guard let managedObjectID = coordinator.managedObjectID(forURIRepresentation: objectURL) else { return nil }
guard let object = LocalStorageManager.persistentContainer.viewContext.object(
with: managedObjectID
) as? WFACollection else { return nil }
return object
}
}
struct CollectionListView_LoggedOutPreviews: PreviewProvider {
static var previews: some View {
let context = LocalStorageManager.persistentContainer.viewContext
let model = WriteFreelyModel()
return CollectionListView()
.environment(\.managedObjectContext, context)
.environmentObject(model)
}
}

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