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MainFeedView.swift
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MainFeedView.swift
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import SwiftUI
import RssReader
import URLImage
struct MainFeedView: ConnectedView {
struct Props {
let loading: Bool
let items: [Post]
let feedOptions: [FeedPickerOption]
let selectedFeedOption: FeedPickerOption
let onReloadFeed: (Bool) -> Void
let onSelectFeed: (Feed?) -> Void
}
enum FeedPickerOption: Hashable {
case all, feed(Feed)
var title: String {
return String((self.feed?.title ?? "All").prefix(20))
}
var feed: Feed? {
switch self {
case .all:
return nil
case .feed(let feed):
return feed
}
}
}
func map(state: FeedState, dispatch: @escaping DispatchFunction) -> Props {
let selectedFeedOption: FeedPickerOption
if let selectedFeed = state.selectedFeed {
selectedFeedOption = .feed(selectedFeed)
} else {
selectedFeedOption = .all
}
return Props(loading: state.progress,
items: state.mainFeedPosts(),
feedOptions: [.all] + state.feeds.map { FeedPickerOption.feed($0)},
selectedFeedOption: selectedFeedOption,
onReloadFeed: { reload in
dispatch(FeedAction.Refresh(forceLoad: reload))
},
onSelectFeed: { feed in
dispatch(FeedAction.SelectFeed(feed: feed))
})
}
@SwiftUI.State private var showSelectFeed = false
init() {
UITableView.appearance().backgroundColor = .white
}
func body(props: Props) -> some View {
VStack {
if showSelectFeed {
feedPicker(props: props)
}
List(props.items, rowContent: PostRow.init)
}
.navigationBarTitleDisplayMode(.inline)
.navigationBarItems(leading: refreshButton(props: props), trailing: editFeedLink)
.toolbar {
ToolbarItem(placement: .principal) {
navigationTitle(props: props)
}
}
.onAppear {
props.onReloadFeed(true)
}
}
var refreshButtionAnimation: Animation {
Animation.linear(duration: 0.8).repeatForever(autoreverses: false)
}
func navigationTitle(props: Props) -> some View {
VStack {
HStack {
Text("RSS Reader").font(.headline)
Button(action: {
withAnimation { showSelectFeed.toggle() }
}) {
Image(systemName: showSelectFeed ? "chevron.up" : "chevron.down").imageScale(.small)
}
}
Text(props.selectedFeedOption.title).font(.subheadline).lineLimit(1)
}
}
func feedPicker(props: Props) -> some View {
let binding = Binding<FeedPickerOption>(
get: { props.selectedFeedOption },
set: { props.onSelectFeed($0.feed) }
)
return Picker("", selection: binding) {
ForEach(props.feedOptions, id: \.self) { option in
HStack {
if let imageUrl = option.feed?.imageUrl, let url = URL(string: imageUrl) {
URLImage(url: url) { image in
image
.resizable()
.aspectRatio(contentMode: .fit)
}
.frame(width: 24, height: 24)
.cornerRadius(12.0)
.clipped()
}
Text(option.title)
}
}
}
.background(Color("FeedPicker"))
.pickerStyle(.wheel)
}
func refreshButton(props: Props) -> some View {
Button(action: {
props.onReloadFeed(true)
}) {
Image(systemName: "arrow.clockwise")
.imageScale(.large)
.rotationEffect(Angle.degrees(props.loading ? 360 : 0)).animation( props.loading ? refreshButtionAnimation : .default)
}
}
var editFeedLink: some View {
NavigationLink(destination: NavigationLazyView<FeedsList>(FeedsList())) {
Image(systemName: "pencil.circle").imageScale(.large)
}
}
}
extension Post: Identifiable { }