git.r.bdr.sh - rbdr/map/blob - Map/Views/ContentView.swift

   1 //
   2 //  ContentView.swift
   3 //  Map
   4 //
   5 //  Created by Ruben Beltran del Rio on 2/1/21.
   6 //
   7
   8 import CoreData
   9 import SwiftUI
  10
  11 struct ContentView: View {
  12   @Environment(\.managedObjectContext) private var viewContext
  13
  14   @FetchRequest(
  15     sortDescriptors: [NSSortDescriptor(keyPath: \Map.createdAt, ascending: true)],
  16     animation: .default)
  17   private var maps: FetchedResults<Map>
  18
  19   var body: some View {
  20     NavigationView {
  21       List {
  22         if maps.count == 0 {
  23           DefaultMapView()
  24         }
  25         ForEach(maps) { map in
  26           NavigationLink(destination: MapDetailView(map: map)) {
  27             HStack {
  28               Text(map.title ?? "Untitled Map")
  29               Spacer()
  30               Text(mapFormatter.string(from: (map.createdAt ?? Date())))
  31                 .font(.caption)
  32                 .padding(.vertical, 2.0)
  33                 .padding(.horizontal, 4.0)
  34                 .background(Color.accentColor)
  35                 .foregroundColor(Color.black)
  36                 .cornerRadius(2.0)
  37             }.padding(.leading, 8.0)
  38           }
  39         }
  40         .onDelete(perform: deleteMaps)
  41       }.frame(minWidth: 250.0, alignment: .leading)
  42         .toolbar {
  43           HStack {
  44             Button(action: toggleSidebar) {
  45               Label("Toggle Sidebar", systemImage: "sidebar.left")
  46             }
  47             Button(action: addMap) {
  48               Label("Add Map", systemImage: "plus")
  49             }
  50           }
  51         }
  52     }
  53   }
  54
  55   private func toggleSidebar() {
  56     NSApp.keyWindow?.firstResponder?.tryToPerform(
  57       #selector(NSSplitViewController.toggleSidebar(_:)), with: nil)
  58   }
  59
  60   private func addMap() {
  61     withAnimation {
  62       let newMap = Map(context: viewContext)
  63       newMap.uuid = UUID()
  64       newMap.createdAt = Date()
  65       newMap.title = "Map \(newMap.createdAt!.format())"
  66       newMap.content = ""
  67
  68       do {
  69         try viewContext.save()
  70       } catch {
  71         let nsError = error as NSError
  72         fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
  73       }
  74     }
  75   }
  76
  77   private func deleteMaps(offsets: IndexSet) {
  78
  79     withAnimation {
  80       offsets.map { maps[$0] }.forEach(viewContext.delete)
  81
  82       do {
  83         try viewContext.save()
  84       } catch {
  85         let nsError = error as NSError
  86         fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
  87       }
  88     }
  89   }
  90 }
  91
  92 private let mapFormatter: DateFormatter = {
  93   let formatter = DateFormatter()
  94   formatter.dateStyle = .short
  95   formatter.timeStyle = .none
  96   return formatter
  97 }()
  98
  99 struct ContentView_Previews: PreviewProvider {
 100   static var previews: some View {
 101     ContentView().environment(
 102       \.managedObjectContext, PersistenceController.preview.container.viewContext)
 103   }
 104 }