Refactoring the html editor toolbar.

Wino.Calendar.ViewModels/CalendarEventComposePageViewModel.cs

@@ -242,14 +242,21 @@ public partial class CalendarEventComposePageViewModel : CalendarBaseViewModel
         {
             foreach (var file in pickedFiles)
             {
-                if (Attachments.Any(existing => existing.FilePath.Equals(file.FullFilePath, StringComparison.OrdinalIgnoreCase)))
-                    continue;
-
-                Attachments.Add(new CalendarComposeAttachmentViewModel(file.FileName, file.FullFilePath, file.FileExtension, file.Size));
+                TryAddAttachment(file.FileName, file.FullFilePath, file.FileExtension, file.Size);
             }
         });
     }
 
+    public bool TryAddAttachment(string filePath, long size)
+    {
+        if (string.IsNullOrWhiteSpace(filePath))
+            return false;
+
+        var fileName = Path.GetFileName(filePath);
+        var fileExtension = Path.GetExtension(filePath);
+        return TryAddAttachment(fileName, filePath, fileExtension, size);
+    }
+
     [RelayCommand]
     private void RemoveAttachment(CalendarComposeAttachmentViewModel attachment)
     {
@@ -640,6 +647,18 @@ public partial class CalendarEventComposePageViewModel : CalendarBaseViewModel
         OnPropertyChanged(nameof(HasAttachments));
     }
 
+    private bool TryAddAttachment(string fileName, string filePath, string fileExtension, long size)
+    {
+        if (string.IsNullOrWhiteSpace(filePath) ||
+            Attachments.Any(existing => existing.FilePath.Equals(filePath, StringComparison.OrdinalIgnoreCase)))
+        {
+            return false;
+        }
+
+        Attachments.Add(new CalendarComposeAttachmentViewModel(fileName, filePath, fileExtension, size));
+        return true;
+    }
+
 }
 
 public partial class CalendarComposeFrequencyOption : ObservableObject