drag and drop feature (#15059)

- implemented drag and drop behavior for .dyn and .dyf files
- added test for the new feature. the test is passing, but ignored as webView2 initialization still causes time out on master-15

src/DynamoCoreWpf/Views/Core/DynamoView.xaml.cs

@@ -1386,15 +1386,15 @@ private void DynamoView_Loaded(object sender, EventArgs e)
             }
 
             // Load the new HomePage
-            if (IsNewAppHomeEnabled) LoadHomePage();
+            if (DynamoModel.IsTestMode || IsNewAppHomeEnabled) LoadHomePage();
 
             loaded = true;
         }
 
         // Add the HomePage to the DynamoView once its loaded
         private void LoadHomePage()
         {
-            if (homePage == null && startPage != null)
+            if (homePage == null && (startPage != null || DynamoModel.IsTestMode))
             {
                 homePage = new UI.Views.HomePage();
                 homePage.DataContext = startPage;

src/DynamoCoreWpf/Views/HomePage/HomePage.xaml.cs

@@ -157,6 +157,7 @@ private async void UserControl_Loaded(object sender, System.Windows.RoutedEventA
                 this.dynWebView.CoreWebView2.Settings.AreDefaultContextMenusEnabled = false;
                 this.dynWebView.CoreWebView2.Settings.IsZoomControlEnabled = false;
                 this.dynWebView.CoreWebView2.Settings.AreDevToolsEnabled = true;
+                this.dynWebView.CoreWebView2.NewWindowRequested += CoreWebView2_NewWindowRequested;
 
                 // Load the embeded resources
                 var assembly = Assembly.GetExecutingAssembly();
@@ -200,6 +201,39 @@ private async void UserControl_Loaded(object sender, System.Windows.RoutedEventA
             }
         }
 
+        private void CoreWebView2_NewWindowRequested(object sender, CoreWebView2NewWindowRequestedEventArgs e)
+        {
+            e.Handled = true;
+            ProcessUri(e.Uri);
+        }
+
+        internal bool ProcessUri(string uri)
+        {
+            if (string.IsNullOrWhiteSpace(uri)) return false;
+
+            Uri fileUri;
+            try
+            {
+                fileUri = new Uri(uri);
+            }
+            catch (UriFormatException)
+            {
+                return false;
+            }
+
+            if (fileUri.IsFile)
+            {
+                var filePath = fileUri.LocalPath;
+                if (filePath.EndsWith(".dyn") || filePath.EndsWith(".dyf"))
+                {
+                    OpenFile(filePath);
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         internal async void LoadingDone()   
         {
             SendGuidesData();
@@ -443,13 +477,15 @@ public void Dispose()
             DataContextChanged -= OnDataContextChanged;
             if(startPage != null) startPage.DynamoViewModel.PropertyChanged -= DynamoViewModel_PropertyChanged;
 
+            this.dynWebView.CoreWebView2.NewWindowRequested -= CoreWebView2_NewWindowRequested;
 
             if (File.Exists(fontFilePath))
             {
                 File.Delete(fontFilePath);
             }
         }
         #endregion
+
     }
 
 

test/DynamoCoreWpfTests/HomePageTests.cs

@@ -547,6 +547,44 @@ public void ShowSampleFilesFolderCommandFromHomePage()
             Assert.IsTrue(wasTestHookInvoked, "The ShowSampleFilesFolderCommand method did not invoke the test hook as expected.");
             Assert.IsTrue(windoClosed, "Dynamo View was not closed correctly.");
         }
+
+        [Test]
+        [Ignore("IsNewAppHomeEnabled flag is set to false")]
+        public void CanOpenGraphOnDragAndDrop()
+        {
+            // Arrange
+            var filePath = new Uri(Path.Combine(GetTestDirectory(ExecutingDirectory), @"core\nodeLocationTest.dyn"));
+            var vm = View.DataContext as DynamoViewModel;
+            var wasTestHookInvoked = false;
+
+            string receivedPath = null;
+            HomePage.TestHook = (path) =>
+            {
+                receivedPath = path;
+                wasTestHookInvoked = true;
+            };
+
+            Assert.IsFalse(wasTestHookInvoked);
+
+            // Create the startPage manually, as it is not created under Test environment
+            var startPage = new StartPageViewModel(vm, true);
+            var homePage = View.homePage;
+            homePage.DataContext = startPage;
+            InitializeWebView2(homePage.dynWebView);
+
+            // Act
+            var result = homePage.ProcessUri(filePath.ToString());
+
+            Assert.IsTrue(result, "The file Uri was not processed correctly.");
+
+            // Clean up to avoid failures testing in pipeline
+            var windowClosed = CloseViewAndCleanup(View);
+
+            // Assert
+            Assert.IsTrue(wasTestHookInvoked, "The OpenFile method did not invoke the test hook as expected.");
+            Assert.AreEqual(filePath, receivedPath, "The command did not return the same filePath");
+            Assert.IsTrue(windowClosed, "Dynamo View was not closed correctly.");
+        }
         #endregion
 
         #region helpers