DYN-8303: Enable deferred node load

src/DynamoCoreWpf/Controls/NotificationsControl.xaml

@@ -1,4 +1,4 @@
-<UserControl x:Class="Dynamo.Wpf.Controls.NotificationsControl"
+<UserControl x:Class="Dynamo.Wpf.Controls.NotificationsControl"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
@@ -35,6 +35,7 @@
             <core:NotificationLevelToColorConverter x:Key="NotificationLevelToColorConverter"></core:NotificationLevelToColorConverter>
             <core:ZeroToVisibilityCollapsedConverter x:Key="ZeroToVisibilityCollapsedConverter" />
             <converters:EmptyStringToHiddenConverter x:Key="EmptyStringToHiddenConverter" />
+            <converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
             <converters:LinterIssueCountToVisibilityConverter x:Key="LinterIssueCountToVisibilityConverter" />
             <ResourceDictionary.MergedDictionaries>
                 <ui:SharedResourceDictionary Source="{x:Static ui:SharedDictionaryManager.DynamoConvertersDictionaryUri}" />
@@ -45,6 +46,7 @@
 
     <Grid HorizontalAlignment="Stretch" VerticalAlignment="Center">
         <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="Auto" />
             <ColumnDefinition Width="Auto" />
             <ColumnDefinition Width="Auto" />
             <ColumnDefinition Width="*" />
@@ -128,8 +130,20 @@
             </ItemsControl.ItemsPanel>
         </ItemsControl>
 
+        <StackPanel
+            Grid.Column="2"
+            Orientation="Horizontal" Margin="30,0"
+            Visibility="{Binding HomeSpaceViewModel.NodesLoading, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource BoolToVisibilityConverter}}">
+            <Image Width="20"
+                Source="/DynamoCoreWpf;component/UI/Images/alert.png" />
+            <Label x:Name="LoadedNodesText"
+               Content="{Binding HomeSpaceViewModel.LoadedNodesCount}" 
+               FontSize="12" Padding="2 3 2 2" 
+               Foreground="{StaticResource PrimaryCharcoal200Brush}"/>
+        </StackPanel>
+
         <StackPanel Orientation="Horizontal"
-                    Grid.Column="2"
+                    Grid.Column="3"
                     HorizontalAlignment="Right"
                     VerticalAlignment="Center"
                     Margin="30,0"
@@ -156,4 +170,4 @@
         </StackPanel>
 
     </Grid>
-</UserControl>
+</UserControl>

src/DynamoCoreWpf/DynamoCoreWpf.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <UILib>true</UILib>
   </PropertyGroup>
@@ -414,6 +414,7 @@
     <EmbeddedResource Include="Properties\Resources.ru-RU.resx" />
     <EmbeddedResource Include="Properties\Resources.zh-CN.resx" />
     <EmbeddedResource Include="Properties\Resources.zh-TW.resx" />
+    <EmbeddedResource Include="NodeCacheImages.resx" />
   </ItemGroup>
 
   <ItemGroup>

src/DynamoCoreWpf/PublicAPI.Unshipped.txt

@@ -4462,6 +4462,7 @@ readonly Dynamo.Wpf.ViewModels.Watch3D.DefaultWatch3DViewModel.preferences -> Dy
 readonly Dynamo.Wpf.ViewModels.Watch3D.DefaultWatch3DViewModel.scheduler -> Dynamo.Scheduler.IScheduler
 readonly Dynamo.Wpf.ViewModels.Watch3D.DefaultWatch3DViewModel.watchModel -> Dynamo.Graph.Nodes.NodeModel
 static Dynamo.Controls.DynamoView.getUniqueAddOnCategories(System.Collections.Generic.IEnumerable<Dynamo.Search.SearchElements.NodeSearchElement> elements) -> System.Collections.Generic.IEnumerable<string>
+static Dynamo.Controls.NodeView.GetNodeImage(string nodeName) -> System.Windows.Media.Imaging.BitmapImage
 static Dynamo.Interfaces.WatchHandler.GenerateWatchViewModelForData(this Dynamo.Interfaces.IWatchHandler handler, dynamic value, System.Collections.Generic.IEnumerable<string> preferredDictionaryOrdering, ProtoCore.RuntimeCore runtimeCore, string tag, bool showRawData = true) -> Dynamo.ViewModels.WatchViewModel
 static Dynamo.Nodes.AnnotationView.SelectAllTextOnFocus -> System.Windows.DependencyProperty
 static Dynamo.PackageManager.PackageManagerSearchViewModel.FormatPackageVersionList(System.Collections.Generic.IEnumerable<System.Tuple<Greg.Responses.PackageHeader, Greg.Responses.PackageVersion>> packages) -> string
@@ -4517,11 +4518,13 @@ static Dynamo.Utilities.WindowsBaseExtensions.AsDynamoType(this System.Windows.P
 static Dynamo.Utilities.WindowsBaseExtensions.AsWindowsType(this Dynamo.Utilities.Point2D point) -> System.Windows.Point
 static Dynamo.Utilities.WindowsBaseExtensions.AsWindowsType(this Dynamo.Utilities.Thickness thickness) -> System.Windows.Thickness
 static Dynamo.ViewModels.ConnectorPinViewModel.OneThirdWidth.get -> double
+static Dynamo.ViewModels.DynamoViewModel.MigrateNodeCacheToResX() -> void
 static Dynamo.ViewModels.DynamoViewModel.ReportABug() -> void
 static Dynamo.ViewModels.DynamoViewModel.ReportABug(object bodyContent) -> void
 static Dynamo.ViewModels.DynamoViewModel.Start(Dynamo.ViewModels.DynamoViewModel.StartConfiguration startConfiguration = default(Dynamo.ViewModels.DynamoViewModel.StartConfiguration)) -> Dynamo.ViewModels.DynamoViewModel
 static Dynamo.ViewModels.GeometryScalingOptions.ConvertScaleFactorToUI(int scaleValue) -> int
 static Dynamo.ViewModels.GeometryScalingOptions.ConvertUIToScaleFactor(int index) -> int
+static Dynamo.ViewModels.NodeViewModel.GetNodeImage(string nodeName) -> System.Windows.Media.Imaging.BitmapImage
 static Dynamo.ViewModels.SearchViewModel.RemoveLastPartOfText(string text) -> string
 static Dynamo.Wpf.Extensions.ObservableCollectionExtension.TryInsert(this System.Collections.ObjectModel.ObservableCollection<Dynamo.Wpf.ViewModels.ISearchEntryViewModel> items, int index, Dynamo.Wpf.ViewModels.ISearchEntryViewModel entry) -> void
 static Dynamo.Wpf.Properties.Resources.AboutWindowCannotGetVersion.get -> string

src/DynamoCoreWpf/ViewModels/Core/WorkspaceViewModel.cs

@@ -195,6 +195,25 @@ internal void OnRequestNodeAutoCompleteViewExtension(MLNodeClusterAutoCompletion
             RequestNodeAutoCompleteViewExtension?.Invoke(clusterNodeAutoComplete);
         }
 
+        private Stopwatch nodeLoadStopwatch = new Stopwatch();
+        //internal event Action NodeViewLoaded;
+        internal void OnNodeViewLoaded()
+        {
+            if (loadedNodesCount < Nodes.Count)
+            {
+                if (!nodeLoadStopwatch.IsRunning)
+                {
+                    nodeLoadStopwatch.Restart();
+                }
+            }
+            loadedNodesCount++;
+            if (loadedNodesCount == Nodes.Count)
+            {
+                nodeLoadStopwatch.Stop();
+                DynamoViewModel.Model.Logger.Log($"{loadedNodesCount} nodes loaded in {nodeLoadStopwatch.ElapsedMilliseconds} ms");
+            }
+        }
+
         #endregion
 
         #region Properties and Fields
@@ -583,6 +602,28 @@ internal GeometryScalingViewModel GeoScalingViewModel
             }
         }
 
+        internal bool NodesLoading
+        {
+            get
+            {
+                return Nodes.Count() > LoadedNodesCount;
+            }
+        }
+
+        private int loadedNodesCount = 0;
+        internal int LoadedNodesCount
+        {
+            get
+            {
+                return loadedNodesCount;
+            }
+            set
+            {
+                loadedNodesCount = value;
+                RaisePropertyChanged(nameof(LoadedNodesCount));
+                RaisePropertyChanged(nameof(NodesLoading));
+            }
+        }
         /// <summary>
         /// Ensures that a preview control is initialized only when it is
         /// absolutely needed. It lives here so that it can be shared by
@@ -969,6 +1010,7 @@ void Model_NodesCleared()
             Errors.Clear();
 
             PostNodeChangeActions();
+            loadedNodesCount=0;
         }
 
         private void unsubscribeNodeEvents(NodeViewModel nodeViewModel)
@@ -995,6 +1037,7 @@ void Model_NodeRemoved(NodeModel node)
             PostNodeChangeActions();
 
             SetNodeCountOptimizationEnabled(zoomAnimationThresholdFeatureFlagVal);
+            loadedNodesCount--;
         }
 
         void Model_NodeAdded(NodeModel node)