initial commit

Events.cs

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+using Dynamo.Extensions;
+using Dynamo.Graph.Nodes;
+using System.Windows;
+
+namespace HelloDynamo
+{
+    public static class Events
+    {
+        private static ReadyParams DynamoReadyParams;
+
+        /// <summary>
+        /// Registers custom events to be triggered when something happens in Dynamo.
+        /// </summary>
+        /// <param name="dynamoReadyParams">Reference to the Dynamo extension ready parameters.</param>
+        public static void RegisterEventHandlers(ReadyParams dynamoReadyParams)
+        {
+            dynamoReadyParams.CurrentWorkspaceChanged += OnCurrentWorkspaceChanged;
+            dynamoReadyParams.CurrentWorkspaceModel.NodeAdded += OnNodeAdded;
+            dynamoReadyParams.CurrentWorkspaceModel.NodeRemoved += OnNodeRemoved;
+
+            // keep a reference to the parameters supplied at startup
+            // so we can unregister our event handlers later
+            DynamoReadyParams = dynamoReadyParams;
+        }
+
+        /// <summary>
+        /// Removes our custom events from Dynamo.
+        /// </summary>
+        public static void UnregisterEventHandlers()
+        {
+            DynamoReadyParams.CurrentWorkspaceChanged -= OnCurrentWorkspaceChanged;
+            DynamoReadyParams.CurrentWorkspaceModel.NodeAdded -= OnNodeAdded;
+            DynamoReadyParams.CurrentWorkspaceModel.NodeRemoved -= OnNodeRemoved;
+        }
+
+        /// <summary>
+        /// Event triggered whenever a Dynamo Workspace (file) is changed.
+        /// </summary>
+        /// <param name="obj">The current Dynamo workspace</param>
+        private static void OnCurrentWorkspaceChanged(Dynamo.Graph.Workspaces.IWorkspaceModel obj)
+        {
+            MessageBox.Show($"Congratulations on opening the {obj.Name} workspace!");
+        }
+
+        /// <summary>
+        /// Event triggered whenever a new node is added to the Dynamo canvas.
+        /// </summary>
+        /// <param name="node">The node that was added.</param>
+        private static void OnNodeAdded(NodeModel node)
+        {
+            MessageBox.Show($"You just added the {node.Name} node with Id {node.GUID} to the canvas.");
+        }
+
+        /// <summary>
+        /// Event triggered whenever a node is removed from the Dynamo canvas.
+        /// </summary>
+        /// <param name="node">The node that was removed.</param>
+        private static void OnNodeRemoved(NodeModel node)
+        {
+            MessageBox.Show($"You just removed the {node.Name} node with Id {node.GUID} from the canvas.");
+        }
+    }
+}

HelloDynamo_ExtensionDefinition.xml

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+<ExtensionDefinition>
+  <AssemblyPath>..\bin\HelloDynamo.dll</AssemblyPath>
+  <TypeName>HelloDynamo.ExtensionExample</TypeName>
+</ExtensionDefinition>

HelloDynamo_ViewExtensionDefinition.xml

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+<ViewExtensionDefinition>
+  <AssemblyPath>..\bin\HelloDynamo.dll</AssemblyPath>
+  <TypeName>HelloDynamo.ViewExtensionExample</TypeName>
+</ViewExtensionDefinition>

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("HelloDynamo")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("HelloDynamo")]
+[assembly: AssemblyCopyright("Copyright ©  2018")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("528a5658-2861-4727-bdc8-c3cdb60c3601")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

StatsViewModel.cs

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+using Dynamo.Core;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Dynamo.Extensions;
+using Dynamo.Graph.Nodes;
+using Dynamo.ViewModels;
+using System.Windows;
+using Dynamo.Graph;
+using Dynamo.Wpf.Extensions;
+using Dynamo.Graph.Annotations;
+using Dynamo.Graph.Workspaces;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace HelloDynamo.Stats
+{
+    public class StatsViewModel : NotificationObject
+    {
+        private ViewLoadedParams readyParams;
+        private string activeNodeCount;
+        private string activeWireCount;
+
+        //Displays the count of the nodes in the workspace
+        public string ActiveNodeCount => readyParams.CurrentWorkspaceModel.Nodes.Count().ToString();
+
+        //Displays the count of the wires in the workspace
+        public string ActiveWireCount => readyParams.CurrentWorkspaceModel.Connectors.Count().ToString();
+
+        public StatsViewModel(ReadyParams p)
+        {
+            readyParams = p as ViewLoadedParams;
+            readyParams.CurrentWorkspaceModel.NodeAdded += OnNodeCountChange;
+            readyParams.CurrentWorkspaceModel.NodeRemoved += OnNodeCountChange;
+            readyParams.CurrentWorkspaceModel.ConnectorAdded += OnWireCountChange;
+            readyParams.CurrentWorkspaceModel.ConnectorDeleted += OnWireCountChange;
+            readyParams.CurrentWorkspaceModel.NodeAdded += OnNodesUpdate;
+            readyParams.CurrentWorkspaceModel.NodeRemoved += OnNodesUpdate;
+            readyParams.CurrentWorkspaceChanged += OnWorkspaceChange;
+        }
+
+        #region ChangeProperty events
+
+        private void OnNodeCountChange(NodeModel obj)
+        {
+            RaisePropertyChanged("ActiveNodeCount");
+        }
+
+        private void OnWireCountChange(Dynamo.Graph.Connectors.ConnectorModel obj)
+        {
+            RaisePropertyChanged("ActiveWireCount");
+        }
+
+        private void OnNodesUpdate(NodeModel obj)
+        {
+            RaisePropertyChanged("ActiveNodeCount");
+        }
+
+        private void OnWorkspaceChange(Dynamo.Graph.Workspaces.IWorkspaceModel obj)
+        {
+            RaisePropertyChanged("ActiveNodeCount", "ActiveWireCount");
+        }
+
+        #endregion
+
+        public void Dispose()
+        {
+            readyParams.CurrentWorkspaceModel.NodeAdded -= OnNodeCountChange;
+            readyParams.CurrentWorkspaceModel.NodeRemoved -= OnNodeCountChange;
+            readyParams.CurrentWorkspaceModel.ConnectorAdded -= OnWireCountChange;
+            readyParams.CurrentWorkspaceModel.ConnectorDeleted -= OnWireCountChange;
+            readyParams.CurrentWorkspaceModel.NodeAdded -= OnNodesUpdate;
+            readyParams.CurrentWorkspaceModel.NodeRemoved -= OnNodesUpdate;
+            readyParams.CurrentWorkspaceChanged -= OnWorkspaceChange;
+        }
+    }
+}

StatsWindow.xaml

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+<Window x:Class="HelloDynamo.StatsWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:HelloDynamo"
+        mc:Ignorable="d" d:DesignWidth="300"
+        Width="180" Title="Graph Totals" SizeToContent="Height" BorderThickness="0" Background="White">
+
+    <Grid>
+        <StackPanel Name="MainGrid" 
+                    HorizontalAlignment="Stretch"
+                    VerticalAlignment="Stretch">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="1*" />
+                    <ColumnDefinition Width="1*" />
+                </Grid.ColumnDefinitions>
+                <Grid.RowDefinitions>
+                    <RowDefinition Height="2*" />
+                    <RowDefinition Height="2*" />
+                    <RowDefinition Height="2*" />
+                    <RowDefinition Height="2*" />
+                </Grid.RowDefinitions>
+                <TextBlock Grid.Row="0" Grid.Column="0" Margin="0,0,0,0" Padding="5" TextWrapping="Wrap" TextAlignment="Center" Text="Node Count" FontFamily="Arial" FontWeight="Bold" FontSize="14" Background="#8d9ca9" Foreground="#f2f3f4" VerticalAlignment="Center"/>
+                <TextBlock Grid.Row="0" Grid.Column="1" Margin="0,0,0,0" Padding="5" TextWrapping="Wrap" TextAlignment="Center" Text="Connector Count" FontFamily="Arial" FontWeight="Bold" FontSize="14" Background="#8d9ca9" Foreground="#f2f3f4" VerticalAlignment="Center"/>
+                <TextBlock Grid.Row="1" Grid.Column="0" Margin="0,0,0,0" Text="{Binding ActiveNodeCount}" Padding="10" TextAlignment="Center" FontFamily="Arial" FontWeight="Bold" FontSize="20"  Background="White" Foreground="#13344e"/>
+                <TextBlock Grid.Row="1" Grid.Column="1" Margin="0,0,0,0" Text="{Binding ActiveWireCount}" Padding="10" TextAlignment="Center" FontFamily="Arial" FontWeight="Bold" FontSize="20" Background="White" Foreground="#13344e"/>
+            </Grid>
+        </StackPanel>
+    </Grid>
+</Window>

StatsWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace HelloDynamo
+{
+    /// <summary>
+    /// Interaction logic for StatsWindow.xaml
+    /// </summary>
+    public partial class StatsWindow : Window
+    {
+        public StatsWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}