Add dropdown to package preferences dialog for package paths for download

src/DynamoCore/Configuration/PreferenceSettings.cs

@@ -359,6 +359,28 @@ public string DefaultPythonEngine
         /// </summary>
         private static string defaultPythonEngine;
 
+        private string selectedPackagePathForInstall;
+        /// <summary>
+        /// Currently selected package path where all packages downloaded from the Package Manager
+        /// will be installed.
+        /// </summary>
+        public string SelectedPackagePathForInstall {
+            get
+            {
+                if (string.IsNullOrEmpty(selectedPackagePathForInstall))
+                {
+                    var folder = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+                    selectedPackagePathForInstall = Path.Combine(Path.Combine(folder, "Dynamo", "Dynamo Core"), "2.12");
+                }
+
+                return selectedPackagePathForInstall;
+            }
+            set
+            {
+                selectedPackagePathForInstall = value;
+            }
+        }
+
         /// <summary>
         /// Indicates (if any) which namespaces should not be displayed in the Dynamo node library.
         /// String format: "[library name]:[fully qualified namespace]"
@@ -434,6 +456,7 @@ public PreferenceSettings()
             EnableNodeAutoComplete = true;
             DefaultPythonEngine = string.Empty;
             ViewExtensionSettings = new List<ViewExtensionSettings>();
+
         }
 
         /// <summary>

src/DynamoCoreWpf/ViewModels/Menu/PreferencesViewModel.cs

@@ -10,6 +10,7 @@
 using Dynamo.Graph.Workspaces;
 using Dynamo.Logging;
 using Dynamo.Models;
+using Dynamo.Utilities;
 using Dynamo.Wpf.ViewModels.Core.Converters;
 using Res = Dynamo.Wpf.Properties.Resources;
 
@@ -31,16 +32,18 @@ public class PreferencesViewModel : ViewModelBase, INotifyPropertyChanged
         private string savedChangesLabel;
         private string savedChangesTooltip;
         private ObservableCollection<string> languagesList;
+        private ObservableCollection<string> packagePathsForInstall;
         private ObservableCollection<string> fontSizeList;
         private ObservableCollection<string> numberFormatList;
         private ObservableCollection<StyleItem> styleItemsList;
         private StyleItem addStyleControl;
-        private ObservableCollection<string> _pythonEngineList;
+        private ObservableCollection<string> pythonEngineList;
 
         private string selectedLanguage;
         private string selectedFontSize;
         private string selectedNumberFormat;
         private string selectedPythonEngine;
+        private string selectedPackagePathForInstall;
         private bool runPreviewEnabled;
         private bool runPreviewIsChecked;
         private bool hideIronPAlerts;
@@ -221,7 +224,7 @@ public bool RunPreviewIsChecked
         }
 
         /// <summary>
-        /// LanguagesList property containt the list of all the languages listed in: https://wiki.autodesk.com/display/LOCGD/Dynamo+Languages
+        /// LanguagesList property contains the list of all the languages listed in: https://wiki.autodesk.com/display/LOCGD/Dynamo+Languages
         /// </summary>
         public ObservableCollection<string> LanguagesList
         {
@@ -236,6 +239,49 @@ public ObservableCollection<string> LanguagesList
             }
         }
 
+        /// <summary>
+        /// PackagePathsForInstall contains the list of all package paths where
+        /// packages can be installed.
+        /// </summary>
+        public ObservableCollection<string> PackagePathsForInstall
+        {
+            get
+            {
+                if (packagePathsForInstall == null || !packagePathsForInstall.Any())
+                {
+                    packagePathsForInstall = new ObservableCollection<string>();
+                    packagePathsForInstall.AddRange(preferenceSettings.CustomPackageFolders.Where(
+                        x => x != DynamoModel.StandardLibraryToken));
+                }
+                return packagePathsForInstall;
+            }
+            set
+            {
+                packagePathsForInstall = value;
+                RaisePropertyChanged(nameof(PackagePathsForInstall));
+            }
+        }
+
+        /// <summary>
+        /// Currently selected package path where new packages will be downloaded.
+        /// </summary>
+        public string SelectedPackagePathForInstall
+        {
+            get
+            {
+                return selectedPackagePathForInstall;
+            }
+            set
+            {
+                if (selectedPackagePathForInstall != value)
+                {
+                    selectedPackagePathForInstall = value;
+                    preferenceSettings.SelectedPackagePathForInstall = value;
+                    RaisePropertyChanged(nameof(SelectedPackagePathForInstall));
+                }
+            }
+        }
+
         /// <summary>
         /// FontSizesList contains the list of sizes for fonts defined (the ones defined are Small, Medium, Large, Extra Large)
         /// </summary>
@@ -417,11 +463,11 @@ public ObservableCollection<string> PythonEnginesList
         {
             get
             {
-                return _pythonEngineList;
+                return pythonEngineList;
             }
             set
             {
-                _pythonEngineList = value;
+                pythonEngineList = value;
                 RaisePropertyChanged(nameof(PythonEnginesList));
             }
         }
@@ -620,6 +666,8 @@ public PreferencesViewModel(DynamoViewModel dynamoViewModel)
                 SelectedPythonEngine = Res.DefaultPythonEngineNone : 
                 SelectedPythonEngine = preferenceSettings.DefaultPythonEngine;
 
+            SelectedPackagePathForInstall = preferenceSettings.SelectedPackagePathForInstall;
+
             string languages = Wpf.Properties.Resources.PreferencesWindowLanguages;
             LanguagesList = new ObservableCollection<string>(languages.Split(','));
             SelectedLanguage = languages.Split(',').First();
@@ -693,6 +741,9 @@ private void Model_PropertyChanged(object sender, PropertyChangedEventArgs e)
                 case nameof(SelectedNumberFormat):
                     description = Res.DynamoViewSettingMenuNumberFormat;
                     goto default;
+                case nameof(SelectedPackagePathForInstall):
+                    // Do nothing for now
+                    break;
                 case nameof(RunSettingsIsChecked):
                     description = Res.PreferencesViewRunSettingsLabel;
                     goto default;

src/DynamoCoreWpf/Views/Menu/PreferencesView.xaml

@@ -702,7 +702,7 @@
                     <!--Package Manager Settings Tab-->
                     <TabItem Header="{x:Static p:Resources.PreferencesPackageManagerSettingsTab}"
                              Style="{StaticResource LeftTab}">
-                        <!--This Grid contains the package mangager settings tab-->
+                        <!--This Grid contains the package manager settings tab-->
                         <Grid x:Name="PackageManagerTab" 
                               Margin="1"
                               HorizontalAlignment="Stretch">
@@ -711,14 +711,20 @@
                                 <RowDefinition Height="Auto" />
                             </Grid.RowDefinitions>
 
-                            <!--This Grid row contains the Package Paths section-->
+                            <!--This Grid row contains the Node and Package Paths section-->
                             <Expander x:Name="PackagePathsExpander"
                                         Grid.Row="0"
                                         Style="{StaticResource MenuExpanderStyle}" 
                                         IsExpanded="{Binding PreferencesTabs[Features].ExpanderActive, Converter={StaticResource ExpandersBindingConverter}, ConverterParameter=PackagePathsExpander}"
                                         Header="{x:Static p:Resources.PackagePathsExpanderName}">
                                 <StackPanel Orientation="Vertical" Margin="0,6,0,0">
-                                    <Label>SOME CONTENT</Label>
+                                    <ComboBox Grid.Row="1" 
+                                              Width="213"
+                                              HorizontalAlignment="Left"
+                                              ItemsSource="{Binding Path=PackagePathsForInstall}"
+                                              SelectedItem="{Binding Path=SelectedPackagePathForInstall}"
+                                              Style="{StaticResource NoBordersComboBoxStyle}">
+                                    </ComboBox>
                                 </StackPanel>
                             </Expander>