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PostListFilteredView.swift
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PostListFilteredView.swift
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import SwiftUI
struct PostListFilteredView: View {
@EnvironmentObject var model: WriteFreelyModel
@AppStorage("selectedPostURL") var selectedPostURL: URL?
@Binding var postCount: Int
@FetchRequest(entity: WFACollection.entity(), sortDescriptors: []) var collections: FetchedResults<WFACollection>
var fetchRequest: FetchRequest<WFAPost>
init(collection: WFACollection?, showAllPosts: Bool, postCount: Binding<Int>) {
if showAllPosts {
fetchRequest = FetchRequest<WFAPost>(
entity: WFAPost.entity(),
sortDescriptors: [NSSortDescriptor(key: "createdDate", ascending: false)]
)
} else {
if let collectionAlias = collection?.alias {
fetchRequest = FetchRequest<WFAPost>(
entity: WFAPost.entity(),
sortDescriptors: [NSSortDescriptor(key: "createdDate", ascending: false)],
predicate: NSPredicate(format: "collectionAlias == %@", collectionAlias)
)
} else {
fetchRequest = FetchRequest<WFAPost>(
entity: WFAPost.entity(),
sortDescriptors: [NSSortDescriptor(key: "createdDate", ascending: false)],
predicate: NSPredicate(format: "collectionAlias == nil")
)
}
}
_postCount = postCount
}
var body: some View {
#if os(iOS)
List(selection: $model.selectedPost) {
ForEach(fetchRequest.wrappedValue, id: \.self) { post in
NavigationLink(
destination: PostEditorView(post: post),
tag: post,
selection: $model.selectedPost,
label: {
if model.showAllPosts {
if let collection = collections.filter { $0.alias == post.collectionAlias }.first {
PostCellView(post: post, collectionName: collection.title)
} else {
let collectionName = model.account.server == "https://write.as" ? "Anonymous" : "Drafts"
PostCellView(post: post, collectionName: collectionName)
}
} else {
PostCellView(post: post)
}
})
.deleteDisabled(post.status != PostStatus.local.rawValue)
}
.onDelete(perform: { indexSet in
for index in indexSet {
let post = fetchRequest.wrappedValue[index]
delete(post)
}
})
}
.onAppear(perform: {
self.postCount = fetchRequest.wrappedValue.count
})
.onChange(of: fetchRequest.wrappedValue.count, perform: { value in
self.postCount = value
})
.onChange(of: model.selectedPost) { post in
if post != fetchSelectedPostFromAppStorage() {
saveSelectedPostURL(post)
}
}
#else
List(selection: $model.selectedPost) {
ForEach(fetchRequest.wrappedValue, id: \.self) { post in
NavigationLink(
destination: PostEditorView(post: post),
tag: post,
selection: $model.selectedPost,
label: {
if model.showAllPosts {
if let collection = collections.filter { $0.alias == post.collectionAlias }.first {
PostCellView(post: post, collectionName: collection.title)
} else {
let collectionName = model.account.server == "https://write.as" ? "Anonymous" : "Drafts"
PostCellView(post: post, collectionName: collectionName)
}
} else {
PostCellView(post: post)
}
})
.deleteDisabled(post.status != PostStatus.local.rawValue)
}
.onDelete(perform: { indexSet in
for index in indexSet {
let post = fetchRequest.wrappedValue[index]
delete(post)
}
})
}
.alert(isPresented: $model.isPresentingDeleteAlert) {
Alert(
title: Text("Delete Post?"),
message: Text("This action cannot be undone."),
primaryButton: .cancel() {
model.postToDelete = nil
},
secondaryButton: .destructive(Text("Delete"), action: {
if let postToDelete = model.postToDelete {
model.selectedPost = nil
DispatchQueue.main.async {
model.editor.clearLastDraft()
model.posts.remove(postToDelete)
}
model.postToDelete = nil
}
})
)
}
.onDeleteCommand(perform: {
guard let selectedPost = model.selectedPost else { return }
if selectedPost.status == PostStatus.local.rawValue {
model.postToDelete = selectedPost
model.isPresentingDeleteAlert = true
}
})
.onChange(of: model.selectedPost) { post in
if post != fetchSelectedPostFromAppStorage() {
saveSelectedPostURL(post)
}
}
#endif
}
private func saveSelectedPostURL(_ post: WFAPost?) {
self.selectedPostURL = post?.objectID.uriRepresentation()
}
private func fetchSelectedPostFromAppStorage() -> WFAPost? {
guard let objectURL = selectedPostURL 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? WFAPost else { return nil }
return object
}
func delete(_ post: WFAPost) {
DispatchQueue.main.async {
if post == model.selectedPost {
model.selectedPost = nil
model.editor.clearLastDraft()
}
model.posts.remove(post)
}
}
}
struct PostListFilteredView_Previews: PreviewProvider {
static var previews: some View {
return PostListFilteredView(collection: nil, showAllPosts: false, postCount: .constant(999))
}
}

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