Create KML multi-track

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 // Copyright 2025 Esri // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License.  import ArcGIS import SwiftUI  struct CreateKMLMultiTrackView: View {  /// The view model for the sample.  @StateObject private var model = Model()   /// The KML multi-track loaded from the KMZ file.  @State private var multiTrack: KMLMultiTrack?   /// A Boolean value indicating whether the recenter button is enabled.  @State private var isRecenterEnabled = false   /// The error shown in the error alert.  @State private var error: Error?   /// Represents the various states of the sample.  private enum SampleState {  /// The sample is navigating without recording.  case navigating  /// A KML track is being recorded.  case recording  /// The KML multi-track is being saved, loaded, and viewed.  case viewingMultiTrack  /// The sample is being reset.  case reseting  }   /// The current state of the sample.  @State private var state = SampleState.navigating   /// The text shown in the status bar. This describes the current state of the sample.  private var statusText: String {  return switch state {  case .recording: "Recording KML track. Elements added: \(model.trackElements.count)"  case .viewingMultiTrack: "Saved KML multi-track to 'HikingTracks.kmz'."  default: "Tap record to capture KML track elements."  }  }   var body: some View {  MapViewReader { mapViewProxy in  MapView(map: model.map, graphicsOverlays: model.graphicsOverlays)  .locationDisplay(model.locationDisplay)  .overlay(alignment: .top) {  Text(statusText)  .multilineTextAlignment(.center)  .frame(maxWidth: .infinity, alignment: .center)  .padding(8)  .background(.regularMaterial, ignoresSafeAreaEdges: .horizontal)  }  .toolbar {  ToolbarItemGroup(placement: .bottomBar) {  if let multiTrack {  Button("Delete", systemImage: "trash", role: .destructive) {  state = .reseting  }   Spacer()   TrackPicker(tracks: multiTrack.tracks) { geometry in  await mapViewProxy.setViewpointGeometry(geometry.extent, padding: 25)  }  } else {  Button("Recenter", systemImage: "location.north.circle") {  model.locationDisplay.autoPanMode = .navigation  }  .disabled(!isRecenterEnabled)   Spacer()   Toggle(  state == .recording ? "Stop Recording" : "Record Track",  isOn: .init {  state == .recording  } set: { newValue in  state = newValue ? .recording : .navigating  }  )   Spacer()   Button("Save", systemImage: "square.and.arrow.down") {  state = .viewingMultiTrack  }  .disabled(model.tracks.isEmpty)  }  }  }  .task(id: state) {  // Runs the asynchronous action associated with the sample state.  do {  switch state {  case .navigating:  break  case .recording:  for await location in model.locationDisplay.$location where location != nil {  model.addTrackElement(at: location!.position)  }   model.addTrack()  case .viewingMultiTrack:  await model.locationDisplay.dataSource.stop()   try await model.saveKMLMultiTrack()  multiTrack = try await model.loadKMLMultiTrack()  case .reseting:  model.reset()  multiTrack = nil   await mapViewProxy.setViewpointScale(model.locationDisplay.initialZoomScale)  try await model.startNavigation()  }  } catch {  self.error = error  }  }  .task {  // Starts the navigation when the sample opens.  do {  try await model.startNavigation()  } catch {  self.error = error  }   // Monitors the auto pan mode to determine if recenter button should be enabled.  for await autoPanMode in model.locationDisplay.$autoPanMode {  isRecenterEnabled = autoPanMode != .navigation  }  }  .errorAlert(presentingError: $error)  }  } }  private extension CreateKMLMultiTrackView {  /// A picker for selecting a track from a KML multi-track.  struct TrackPicker: View {  /// The KML tracks options shown in the picker.  let tracks: [KMLTrack]   /// The closure to perform when the selected track has changed.  let onSelectionChanged: (Geometry) async -> Void   /// The track selected by the picker.  @State private var selectedTrack: KMLTrack?   var body: some View {  Picker("Track", selection: $selectedTrack) {  Text("All Tracks")  .tag(nil as KMLTrack?)   ForEach(Array(tracks.enumerated()), id: \.offset) { offset, track in  Text("KML Track #\(offset + 1)")  .tag(track)  }  }  .task(id: selectedTrack) {  guard let geometry = selectedTrack?.geometry  ?? GeometryEngine.union(of: tracks.map(\.geometry)) else {  return  }   await onSelectionChanged(geometry)  }  }  } }  #Preview {  CreateKMLMultiTrackView() }