refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/LauncherPage.cs

@@ -0,0 +1,53 @@
+using Avalonia.Collections;
+using System;
+
+namespace SourceGit.ViewModels {
+    public class LauncherPage : PopupHost {
+        public RepositoryNode Node {
+            get => _node;
+            set => SetProperty(ref _node, value);
+        }
+
+        public object View {
+            get => _view;
+            set => SetProperty(ref _view, value);
+        }
+
+        public AvaloniaList<Models.Notification> Notifications {
+            get;
+            set;
+        } = new AvaloniaList<Models.Notification>();
+
+        public LauncherPage() {
+            _node = new RepositoryNode() {
+                Id = Guid.NewGuid().ToString(),
+                Name = "WelcomePage",
+                Bookmark = 0,
+                IsRepository = false,
+            };
+            _view = new Views.Welcome() { DataContext = new Welcome() };
+        }
+
+        public LauncherPage(RepositoryNode node, Repository repo) {
+            _node = node;
+            _view = new Views.Repository() { DataContext = repo };
+        }
+
+        public override string GetId() {
+            return _node.Id;
+        }
+
+        public void CopyPath() {
+            if (_node.IsRepository) App.CopyText(_node.Id);
+        }
+
+        public void DismissNotification(object param) {
+            if (param is Models.Notification notice) {
+                Notifications.Remove(notice);
+            }
+        }
+
+        private RepositoryNode _node = null;
+        private object _view = null;
+    }
+}