Implemented gif exportation and added some style (again)

GifResizer/Views/MainWindow.xaml.cs

@@ -1,4 +1,5 @@
 using System.Windows;
+using System.Windows.Input;
 using GifResizer.ViewModels;
 using Microsoft.Win32;
 
@@ -31,21 +32,21 @@ public partial class MainWindow : Window
         
             if (fileDialog.ShowDialog() == true)
             {
-                _mainViewModel.FilePath = fileDialog.FileName;
+                _mainViewModel.LoadGifData(fileDialog.FileName);
             }
-        } 
+        }
         catch (Exception ex)
         {
             DisplayErrorMessage("An error occured while selecting the GIF file: " + ex.Message);
         }
-
     }
     
     private void ResizeButton_Click(object sender, RoutedEventArgs e)
     {
         try
         {
-            _mainViewModel.ResizeGif(128,128);
+            _mainViewModel.ResizeGif();
+            DisplaySuccessMessage("Resize successful!");
         }
         catch (Exception ex)
         {
@@ -53,8 +54,18 @@ public partial class MainWindow : Window
         }
     }
     
+    private void IntegerOnly(object sender, TextCompositionEventArgs e)
+    {
+        e.Handled = !int.TryParse(e.Text, out _);
+    }
+    
     private void DisplayErrorMessage(string message)
     {
         MessageBox.Show(message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
     }
+    
+    private void DisplaySuccessMessage(string message)
+    {
+        MessageBox.Show(message, "Success", MessageBoxButton.OK, MessageBoxImage.Information);
+    }
 }