Implemented gif exportation and added some style (again)

GifResizer/ViewModels/MainViewModel.cs

@@ -1,33 +1,62 @@
 using System.ComponentModel;
-using System.IO;
 using System.Runtime.CompilerServices;
 using GifResizer.Models;
 using GifResizer.Service;
 
 namespace GifResizer.ViewModels;
 
-public class MainViewModel : INotifyPropertyChanged
+public sealed class MainViewModel : INotifyPropertyChanged
 {
-    
-    private readonly ResizeService _resizeService;
+    private readonly GifService _gifService;
     public event PropertyChangedEventHandler? PropertyChanged;
     
-    public MainViewModel(ResizeService service)
+    public MainViewModel(GifService service)
     {
-        _resizeService = service;
-        FilePath = Directory.GetCurrentDirectory();
+        _gifService = service;
+        CommonFormats = [
+            new Format(112, 112), 
+            new Format(500, 500), 
+            new Format(1000, 1000)
+        ];
+        FilePath = null;
     }
-
-
-    public string FilePath
+    
+    public string? FilePath
+    {
+        get;
+        set => SetField(ref field, value);
+    }
+    
+    public int? GifWidth
+    {
+        get;
+        set => SetField(ref field, value);
+    }    
+    
+    public int? GifHeight
     {
         get;
         set => SetField(ref field, value);
     }
 
-    public void ResizeGif(int width, int height)
+    public List<Format> CommonFormats { get; }
+
+    public void LoadGifData(string filePath)
     {
-        _resizeService.ResizeGif(FilePath, width, height);
+        GifData data = _gifService.GetData(filePath);
+        FilePath = filePath;
+        GifWidth = data.Width;
+        GifHeight = data.Height;
+    }
+    
+    public void ResizeGif()
+    {
+        if(FilePath == null && GifWidth == null && GifHeight == null) return;
+        _gifService.ResizeGif(FilePath!, GifWidth!.Value, GifHeight!.Value);
+        CommonFormats
+            .Where(f => f.Checked)
+            .ToList()
+            .ForEach(f => _gifService.ResizeGif(FilePath!, f.Width, f.Height));
     }
     
     private bool SetField<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
@@ -37,8 +66,8 @@ public class MainViewModel : INotifyPropertyChanged
         OnPropertyChanged(propertyName);
         return true;
     }
-    
-    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+
+    private void OnPropertyChanged([CallerMemberName] string? propertyName = null)
     {
         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
     }