refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/Checkout.cs

@@ -0,0 +1,28 @@
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class Checkout : Popup {
+        public string Branch {
+            get;
+            private set;
+        }
+
+        public Checkout(Repository repo, string branch) {
+            _repo = repo;
+            Branch = branch;
+            View = new Views.Checkout() { DataContext = this };
+        }
+
+        public override Task<bool> Sure() {
+            _repo.SetWatcherEnabled(false);
+            return Task.Run(() => {
+                SetProgressDescription($"Checkout '{Branch}' ...");
+                var succ = new Commands.Checkout(_repo.FullPath).Branch(Branch, SetProgressDescription);
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return succ;
+            });
+        }
+
+        private Repository _repo;
+    }
+}