refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/Fetch.cs

@@ -0,0 +1,54 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class Fetch : Popup {
+        public List<Models.Remote> Remotes {
+            get => _repo.Remotes;
+        }
+
+        public bool FetchAllRemotes {
+            get => _fetchAllRemotes;
+            set => SetProperty(ref _fetchAllRemotes, value);
+        }
+
+        public Models.Remote SelectedRemote {
+            get;
+            set;
+        }
+
+        public bool Prune {
+            get;
+            set;
+        }
+
+        public Fetch(Repository repo, Models.Remote preferedRemote = null) {
+            _repo = repo;
+            _fetchAllRemotes = true;
+            SelectedRemote = preferedRemote != null ? preferedRemote : _repo.Remotes[0];
+            Prune = true;
+            View = new Views.Fetch() { DataContext = this };
+        }
+
+        public override Task<bool> Sure() {
+            _repo.SetWatcherEnabled(false);
+            return Task.Run(() => {
+                if (FetchAllRemotes) {
+                    foreach (var remote in _repo.Remotes) {
+                        SetProgressDescription($"Fetching remote: {remote.Name}");
+                        new Commands.Fetch(_repo.FullPath, remote.Name, Prune, SetProgressDescription).Exec();
+                    }
+                } else {
+                    SetProgressDescription($"Fetching remote: {SelectedRemote.Name}");
+                    new Commands.Fetch(_repo.FullPath, SelectedRemote.Name, Prune, SetProgressDescription).Exec();
+                }
+
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return true;
+            });
+        }
+
+        private Repository _repo = null;
+        private bool _fetchAllRemotes = true;
+    }
+}