DYN-3572 std.lib should be visible in manage node and package path UI

src/DynamoCore/Configuration/PathManager.cs

@@ -11,6 +11,7 @@
 using Dynamo.Interfaces;
 using Dynamo.Properties;
 using DynamoUtilities;
+using Dynamo.Models;
 
 namespace Dynamo.Core
 {
@@ -93,7 +94,7 @@ class PathManager : IPathManager
 
         private IEnumerable<string> RootDirectories
         {
-            get { return Preferences != null ? Preferences.CustomPackageFolders : rootDirectories; }
+            get { return Preferences != null ? Preferences.CustomPackageFolders.Where(path => path != DynamoModel.StandardLibraryToken) : rootDirectories; }
         }
 
         //Todo in Dynamo 3.0, Add this to the IPathManager interface

src/DynamoCore/Models/DynamoModel.cs

@@ -586,6 +586,9 @@ public static DynamoModel Start(IStartConfiguration configuration)
             return new DynamoModel(configuration);
         }
 
+        // Token representing the standard library directory
+        internal static readonly string StandardLibraryToken = @"%StandardLibrary%";
+
         /// <summary>
         /// Default constructor for DynamoModel
         /// </summary>
@@ -724,7 +727,12 @@ protected DynamoModel(IStartConfiguration config)
             // is no additional location specified. Otherwise, update pathManager.PackageDirectories to include
             // PackageFolders
             if (PreferenceSettings.CustomPackageFolders.Count == 0)
-                PreferenceSettings.CustomPackageFolders = new List<string> { pathManager.UserDataDirectory };
+                PreferenceSettings.CustomPackageFolders = new List<string> { StandardLibraryToken, pathManager.UserDataDirectory };
+
+            if (!PreferenceSettings.CustomPackageFolders.Contains(StandardLibraryToken))
+            {
+                PreferenceSettings.CustomPackageFolders.Insert(0, StandardLibraryToken);
+            }
 
             // Make sure that the default package folder is added in the list if custom packages folder.
             var userDataFolder = pathManager.GetUserDataFolder(); // Get the default user data path

src/DynamoCoreWpf/Properties/Resources.en-US.resx

@@ -1559,10 +1559,6 @@ Next assemblies were loaded several times:
     <value>Add paths to make nodes and packages show up in the library.</value>
     <comment>Package path management dialog content</comment>
   </data>
-  <data name="PackagePathViewSummary2" xml:space="preserve">
-    <value>Top path is the default save location.</value>
-    <comment>Package path management dialog content that describes about the first entry being the default save location.</comment>
-  </data>
   <data name="PackagePathViewTitle" xml:space="preserve">
     <value>Manage Node and Package Paths</value>
     <comment>Package path management dialog title</comment>
@@ -2354,4 +2350,15 @@ Uninstall the following packages: {0}?</value>
   <data name="MessageSamePackageDiffVersInStdLib" xml:space="preserve">
     <value>A different version of the package {1} is already installed as part of the Standard Library. {0} cannot override packages in the Standard Library location.</value>
   </data>
-</root>
+  <data name="PackagePathViewModel_Standard_Library" xml:space="preserve">
+    <value>Standard Library</value>
+  </data>
+  <data name="PackagePathViewSummary2" xml:space="preserve">
+    <value>The default install location is the first path that is not the Standard Library location.</value>
+    <comment>Package path management dialog content that describes about the first non standard libary entry being the default save location.</comment>
+  </data>
+  <data name="PackagePathViewSummary3" xml:space="preserve">
+    <value>Locations in italic(s) are disabled.</value>
+    <comment>Italic locations are disabled. This can currently only be the standard library.</comment>
+  </data>
+</root>

src/DynamoCoreWpf/Properties/Resources.resx

@@ -1906,8 +1906,8 @@ Do you want to install the latest Dynamo update?</value>
     <comment>Package path management dialog content</comment>
   </data>
   <data name="PackagePathViewSummary2" xml:space="preserve">
-    <value>Top path is the default save location.</value>
-    <comment>Package path management dialog content that describes about the first entry being the default save location.</comment>
+    <value>The default install location is the first path that is not the Standard Library location.</value>
+    <comment>Package path management dialog content that describes about the first non standard libary entry being the default save location.</comment>
   </data>
   <data name="PackagePathViewTitle" xml:space="preserve">
     <value>Manage Node and Package Paths</value>
@@ -2354,4 +2354,11 @@ Uninstall the following packages: {0}?</value>
   <data name="MessageSamePackageDiffVersInStdLib" xml:space="preserve">
     <value>A different version of the package {1} is already installed as part of the Standard Library. {0} cannot override packages in the Standard Library location.</value>
   </data>
-</root>
+  <data name="PackagePathViewModel_Standard_Library" xml:space="preserve">
+    <value>Standard Library</value>
+  </data>
+  <data name="PackagePathViewSummary3" xml:space="preserve">
+    <value>Locations in italic(s) are disabled.</value>
+    <comment>Italic locations are disabled. This can currently only be the standard library.</comment>
+  </data>
+</root>

src/DynamoCoreWpf/ViewModels/PackageManager/PackagePathViewModel.cs

@@ -1,13 +1,39 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Windows.Controls;
 using Dynamo.Core;
 using Dynamo.Interfaces;
 using Dynamo.PackageManager;
+using Dynamo.Wpf.Properties;
 using DelegateCommand = Dynamo.UI.Commands.DelegateCommand;
+using Dynamo.Models;
+using System.Windows.Data;
 
 namespace Dynamo.ViewModels
 {
+    public sealed class PathEnabledConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+        {
+            if (value != null && parameter != null)
+            {
+                var disableStandardLibrary = (bool)parameter;
+                if (disableStandardLibrary)
+                {
+                    var path = value as string;
+                    return String.CompareOrdinal(path, Resources.PackagePathViewModel_Standard_Library) != 0;
+                }
+            }
+            return true;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+    }
+
     public class PackagePathEventArgs : EventArgs
     {
         /// <summary>
@@ -34,7 +60,7 @@ public int SelectedIndex
             set
             {
                 selectedIndex = value;
-                RaisePropertyChanged("SelectedIndex");
+                RaisePropertyChanged(nameof(SelectedIndex));
                 RaiseCanExecuteChanged();
             }
         }
@@ -63,18 +89,21 @@ private IPreferences setting
         public DelegateCommand UpdatePathCommand { get; private set; }
         public DelegateCommand SaveSettingCommand { get; private set; }
 
+        public static bool DisableStandardLibrary = false;
+
         public PackagePathViewModel(PackageLoader loader, LoadPackageParams loadParams, CustomNodeManager customNodeManager)
         {
             this.packageLoader = loader;
             this.loadPackageParams = loadParams;
             this.customNodeManager = customNodeManager;
-            RootLocations = new ObservableCollection<string>(setting.CustomPackageFolders);
+
+            InitializeRootLocations();
 
             AddPathCommand = new DelegateCommand(p => InsertPath());
             DeletePathCommand = new DelegateCommand(p => RemovePathAt((int) p), CanDelete);
             MovePathUpCommand = new DelegateCommand(p => SwapPath((int) p, ((int) p) - 1), CanMoveUp);
             MovePathDownCommand = new DelegateCommand(p => SwapPath((int) p, ((int) p) + 1), CanMoveDown);
-            UpdatePathCommand = new DelegateCommand(p => UpdatePathAt((int) p));
+            UpdatePathCommand = new DelegateCommand(p => UpdatePathAt((int) p), CanUpdate);
             SaveSettingCommand = new DelegateCommand(CommitChanges);
 
             SelectedIndex = 0;
@@ -86,13 +115,13 @@ public PackagePathViewModel(PackageLoader loader, LoadPackageParams loadParams,
         public PackagePathViewModel(IPreferences setting)
         {
 
-            RootLocations = new ObservableCollection<string>(setting.CustomPackageFolders);
+            InitializeRootLocations();
 
             AddPathCommand = new DelegateCommand(p => InsertPath());
             DeletePathCommand = new DelegateCommand(p => RemovePathAt((int)p), CanDelete);
             MovePathUpCommand = new DelegateCommand(p => SwapPath((int)p, ((int)p) - 1), CanMoveUp);
             MovePathDownCommand = new DelegateCommand(p => SwapPath((int)p, ((int)p) + 1), CanMoveDown);
-            UpdatePathCommand = new DelegateCommand(p => UpdatePathAt((int)p));
+            UpdatePathCommand = new DelegateCommand(p => UpdatePathAt((int)p), CanUpdate);
             SaveSettingCommand = new DelegateCommand(CommitChanges);
 
             SelectedIndex = 0;
@@ -105,10 +134,15 @@ private void RaiseCanExecuteChanged()
             MovePathUpCommand.RaiseCanExecuteChanged();
             AddPathCommand.RaiseCanExecuteChanged();
             DeletePathCommand.RaiseCanExecuteChanged();
+            UpdatePathCommand.RaiseCanExecuteChanged();
         }
 
         private bool CanDelete(object param)
         {
+            if (RootLocations.IndexOf(Resources.PackagePathViewModel_Standard_Library) == SelectedIndex)
+            {
+                return false;
+            }
             return RootLocations.Count > 1;
         }
 
@@ -122,6 +156,11 @@ private bool CanMoveDown(object param)
             return SelectedIndex < RootLocations.Count - 1;
         }
 
+        private bool CanUpdate(object param)
+        {
+            return RootLocations.IndexOf(Resources.PackagePathViewModel_Standard_Library) != SelectedIndex;
+        }
+
         // The position of the selected entry must always be the first parameter.
         private void SwapPath(int x, int y)
         {
@@ -184,12 +223,40 @@ private void RemovePathAt(int index)
 
         private void CommitChanges(object param)
         {
-            setting.CustomPackageFolders = new List<string>(RootLocations);
+            setting.CustomPackageFolders = CommitRootLocations();
             if (this.packageLoader != null)
             {
                 this.packageLoader.LoadCustomNodesAndPackages(loadPackageParams, customNodeManager);
             }
         }
 
+        private void InitializeRootLocations()
+        {
+            RootLocations = new ObservableCollection<string>(setting.CustomPackageFolders);
+            var index = RootLocations.IndexOf(DynamoModel.StandardLibraryToken);
+
+            if (index != -1)
+            {
+                RootLocations[index] = Resources.PackagePathViewModel_Standard_Library;
+
+                if (setting is IDisablePackageLoadingPreferences disablePrefs)
+                {
+                    DisableStandardLibrary = disablePrefs.DisableStandardLibrary;
+                }
+            }
+        }
+
+        private List<string> CommitRootLocations()
+        {
+            var rootLocations = new List<string>(RootLocations);
+            var index = rootLocations.IndexOf(Resources.PackagePathViewModel_Standard_Library);
+
+            if (index != -1)
+            {
+                rootLocations[index] = DynamoModel.StandardLibraryToken;
+            }
+
+            return rootLocations;
+        }
     }
 }

src/DynamoCoreWpf/Views/PackageManager/PackagePathView.xaml

@@ -17,14 +17,14 @@
         d:DesignWidth="300"
         Background="#515151"
         Style="{DynamicResource DynamoWindowStyle}"
-        d:DataContext="{d:DesignInstance ViewModels:InstalledPackagesViewModel, IsDesignTimeCreatable=False}">
+        d:DataContext="{d:DesignInstance ViewModels:PackagePathViewModel, IsDesignTimeCreatable=False}">
 
     <Window.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
                 <ui:SharedResourceDictionary Source="{x:Static ui:SharedDictionaryManager.DynamoModernDictionaryUri}" />
             </ResourceDictionary.MergedDictionaries>
-
+            <ViewModels:PathEnabledConverter x:Key="PathEnabledConverter" />
             <Style x:Key="PathListBoxStyle"
                    TargetType="ListBox">
                 <Setter Property="SnapsToDevicePixels"
@@ -88,7 +88,6 @@
                                     Background="Transparent">
                                 <ContentPresenter />
                             </Border>
-
                             <ControlTemplate.Triggers>
                                 <Trigger Property="IsSelected"
                                          Value="True">
@@ -107,6 +106,10 @@
                                             Property="Background"
                                             Value="#666666" />
                                 </MultiTrigger>
+                                <DataTrigger Binding="{Binding Converter={StaticResource PathEnabledConverter}, ConverterParameter={x:Static ViewModels:PackagePathViewModel.DisableStandardLibrary}, UpdateSourceTrigger=PropertyChanged}" Value="False">
+                                    <Setter Property="FontStyle"
+                                            Value="Italic" />
+                                </DataTrigger>
                             </ControlTemplate.Triggers>
 
                         </ControlTemplate>
@@ -141,6 +144,9 @@
             <TextBlock TextWrapping="Wrap"
                        FontStyle="Italic"
                        Text="{x:Static p:Resources.PackagePathViewSummary2}" />
+            <TextBlock TextWrapping="Wrap"
+                       FontStyle="Italic"
+                       Text="{x:Static p:Resources.PackagePathViewSummary3}" />
         </StackPanel>
 
         <TextBlock Grid.Row="1"