refactored assignment drop logic

Management.Web/Shared/Module/Assignment/AssignmentDetails.razor

@@ -5,10 +5,9 @@
 @inject CoursePlanner planner
 @inject AssignmentEditorContext assignmentContext
 
+@inherits DroppableAssignment
+
 @code {
-  [Parameter]
-  [EditorRequired]
-  public LocalAssignment Assignment { get; set; } = new();
   [Parameter]
   [EditorRequired]
   public LocalModule Module { get; set; } = new();
@@ -28,84 +27,7 @@
   }
   private bool showAll { get; set; } = false;
 
-  private void dropOnDate(DateTime dropDate)
-  {
-    if (planner.LocalCourse == null) return;
-    var currentModule = planner
-      .LocalCourse
-      .Modules
-      .First(m => 
-        m.Assignments
-          .Select(a => a.Id)
-          .Contains(Assignment.Id)
-      ) ?? throw new Exception("in day callback, could not find module");
-
-
-    var defaultDueTimeDate = new DateTime(
-      year: dropDate.Year,
-      month: dropDate.Month,
-      day: dropDate.Day,
-      hour: planner.LocalCourse.DefaultDueTime.Hour,
-      minute: planner.LocalCourse.DefaultDueTime.Minute,
-      second: 0
-    );
-
-    var moduleWithUpdatedAssignment = currentModule with 
-    {
-      Assignments = currentModule.Assignments.Select(a => 
-        a.Id != Assignment.Id
-        ? a
-        : a with 
-        {
-          DueAt=defaultDueTimeDate
-        }
-      )
-    };
-    var updatedModules = planner.LocalCourse.Modules
-      .Select(m => 
-        m.Name == moduleWithUpdatedAssignment.Name 
-          ? moduleWithUpdatedAssignment 
-          : m
-      );
-    var newCourse = planner.LocalCourse with 
-    {
-      Modules = updatedModules
-    };
-    planner.LocalCourse = newCourse;
-  }
-  private void dropOnModule(LocalModule module)
-  {
-    if (planner.LocalCourse == null) return;
-    var newModules = planner.LocalCourse.Modules.Select(m => 
-      m.Name != module.Name
-        ? m with 
-        {
-          Assignments = m.Assignments.Where(a => a.Id != Assignment.Id).DistinctBy(a => a.Id)
-        }
-        : m with 
-        {
-          Assignments = m.Assignments.Append(Assignment).DistinctBy(a => a.Id)
-        }
-    );
-
-    var newCourse = planner.LocalCourse with 
-    {
-      Modules = newModules
-    };
-    planner.LocalCourse = newCourse;
-  }
-
-  private void DropCallback (DateTime? dropDate, LocalModule? module) 
-  {
-    if (module == null)
-    {
-      dropOnDate(dropDate ?? Assignment.DueAt);
-    } 
-    else
-    {
-      dropOnModule(module);
-    }
-  }
+  
   private void HandleDragStart()
   {
     dragContainer.DropCallback = DropCallback;

Management.Web/Shared/Module/Assignment/DroppableAssignment.razor.cs

@@ -0,0 +1,90 @@
+using Microsoft.AspNetCore.Components;
+
+namespace Management.Web.Shared.Module.Assignment;
+public class DroppableAssignment : ComponentBase
+{
+  [Inject]
+  protected CoursePlanner planner { get; set; } = default!;
+
+  [Parameter, EditorRequired]
+  public LocalAssignment Assignment { get; set; } = default!;
+  private void dropOnDate(DateTime dropDate)
+  {
+    if (planner.LocalCourse == null) return;
+    var currentModule = planner
+      .LocalCourse
+      .Modules
+      .First(m =>
+        m.Assignments
+          .Select(a => a.Id)
+          .Contains(Assignment.Id)
+      ) ?? throw new Exception("in day callback, could not find module");
+
+
+    var defaultDueTimeDate = new DateTime(
+      year: dropDate.Year,
+      month: dropDate.Month,
+      day: dropDate.Day,
+      hour: planner.LocalCourse.DefaultDueTime.Hour,
+      minute: planner.LocalCourse.DefaultDueTime.Minute,
+      second: 0
+    );
+
+    var moduleWithUpdatedAssignment = currentModule with
+    {
+      Assignments = currentModule.Assignments.Select(a =>
+        a.Id != Assignment.Id
+        ? a
+        : a with
+        {
+          DueAt = defaultDueTimeDate
+        }
+      )
+    };
+    var updatedModules = planner.LocalCourse.Modules
+      .Select(m =>
+        m.Name == moduleWithUpdatedAssignment.Name
+          ? moduleWithUpdatedAssignment
+          : m
+      );
+    var newCourse = planner.LocalCourse with
+    {
+      Modules = updatedModules
+    };
+    planner.LocalCourse = newCourse;
+  }
+  private void dropOnModule(LocalModule module)
+  {
+    if (planner.LocalCourse == null) return;
+    var newModules = planner.LocalCourse.Modules.Select(m =>
+      m.Name != module.Name
+        ? m with
+        {
+          Assignments = m.Assignments.Where(a => a.Id != Assignment.Id).DistinctBy(a => a.Id)
+        }
+        : m with
+        {
+          Assignments = m.Assignments.Append(Assignment).DistinctBy(a => a.Id)
+        }
+    );
+
+    var newCourse = planner.LocalCourse with
+    {
+      Modules = newModules
+    };
+    planner.LocalCourse = newCourse;
+  }
+
+  protected void DropCallback(DateTime? dropDate, LocalModule? module)
+  {
+    if (module == null)
+    {
+      dropOnDate(dropDate ?? Assignment.DueAt);
+    }
+    else
+    {
+      dropOnModule(module);
+    }
+  }
+
+}