Fix list kml contents (#1705)

Author: imalcolm1

src/MAUI/Maui.Samples/Samples/Layers/ListKmlContents/ListKmlContents.xaml

@@ -13,15 +13,16 @@
                 <Label Grid.Row="0"
                        HorizontalTextAlignment="Center"
                        Text="Tap to zoom to KML content." />
-                <ListView x:Name="LayerTreeView"
+                <CollectionView  x:Name="LayerTreeView"
                           Grid.Row="1"
-                          ItemSelected="LayerTreeView_OnSelectionChanged">
-                    <ListView.ItemTemplate>
+                          SelectionMode="Single"
+                          SelectionChanged="LayerTreeView_SelectionChanged">
+                    <CollectionView.ItemTemplate>
                         <DataTemplate x:DataType="local:LayerDisplayVM">
-                            <TextCell Text="{Binding Name}" />
+                            <Label Text="{Binding Name}" />
                         </DataTemplate>
-                    </ListView.ItemTemplate>
-                </ListView>
+                    </CollectionView.ItemTemplate>
+                </CollectionView>
             </Grid>
         </Border>
     </Grid>

src/MAUI/Maui.Samples/Samples/Layers/ListKmlContents/ListKmlContents.xaml.cs

@@ -58,7 +58,6 @@ private async Task Initialize()
                 {
                     // LayerDisplayVM is a custom type made for this sample to serve as the ViewModel; it is not a part of ArcGIS Maps SDK for .NET.
                     LayerDisplayVM nodeVm = new LayerDisplayVM(node, null);
-                    _viewModelList.Add(nodeVm);
                     LayerDisplayVM.BuildLayerInfoList(nodeVm, _viewModelList);
                 }
 
@@ -71,10 +70,10 @@ private async Task Initialize()
             }
         }
 
-        private void LayerTreeView_OnSelectionChanged(object sender, SelectedItemChangedEventArgs e)
+        private void LayerTreeView_SelectionChanged(object sender, SelectionChangedEventArgs e)
         {
             // Get the KML node.
-            LayerDisplayVM selectedItem = (LayerDisplayVM)e.SelectedItem;
+            LayerDisplayVM selectedItem = (LayerDisplayVM)e.CurrentSelection.First();
 
             _ = NavigateToNode(selectedItem.Node);
         }
@@ -266,6 +265,7 @@ private async Task<Viewpoint> GetAltitudeAdjustedViewpointAsync(KmlNode node, Vi
         }
 
         #endregion viewpoint_conversion
+
     }
 
     public class LayerDisplayVM

src/WPF/WPF.Viewer/Samples/Layers/ListKmlContents/ListKmlContents.xaml.cs

@@ -62,8 +62,8 @@ private async Task Initialize()
                 {
                     // LayerDisplayVM is a custom type made for this sample to serve as the ViewModel; it is not a part of ArcGIS Maps SDK for .NET.
                     LayerDisplayVM nodeVm = new LayerDisplayVM(node, null);
+                    LayerDisplayVM.BuildNodeTree(nodeVm);
                     _viewModelList.Add(nodeVm);
-                    LayerDisplayVM.BuildLayerInfoList(nodeVm, _viewModelList);
                 }
 
                 // Update the list of layers, using the root node from the list.
@@ -292,7 +292,7 @@ public override string ToString()
             return Node.GetType().Name + " - " + Node.Name;
         }
 
-        public static void BuildLayerInfoList(LayerDisplayVM root, IList<LayerDisplayVM> result)
+        public static void BuildNodeTree(LayerDisplayVM root)
         {
             // Make the node visible.
             root.Node.IsVisible = true;
@@ -324,7 +324,7 @@ public static void BuildLayerInfoList(LayerDisplayVM root, IList<LayerDisplayVM>
                 root.Children.Add(layerVm);
 
                 // Recursively add children.
-                BuildLayerInfoList(layerVm, result);
+                BuildNodeTree(layerVm);
             }
         }
     }

src/WinUI/ArcGIS.WinUI.Viewer/Samples/Layers/ListKmlContents/ListKmlContents.xaml.cs

@@ -62,7 +62,6 @@ private async Task Initialize()
                 {
                     // LayerDisplayVM is a custom type made for this sample to serve as the ViewModel; it is not a part of ArcGIS Maps SDK for .NET.
                     LayerDisplayVM nodeVm = new LayerDisplayVM(node, null);
-                    _viewModelList.Add(nodeVm);
                     LayerDisplayVM.BuildLayerInfoList(nodeVm, _viewModelList);
                 }