fix: TreeView do NOT support NavigationMethod.Direction with invisible nodes (#391)

src/ViewModels/Welcome.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 
 using Avalonia.Collections;
 using Avalonia.Controls;
@@ -76,6 +77,30 @@ namespace SourceGit.ViewModels
             Preference.Instance.MoveNode(from, to);
         }
 
+        public RepositoryNode GetPrevVisible(RepositoryNode node)
+        {
+            var visibleRows = new List<RepositoryNode>();
+            CollectVisibleRows(visibleRows, RepositoryNodes);
+
+            var idx = visibleRows.IndexOf(node);
+            if (idx <= 1)
+                return null;
+
+            return visibleRows[idx - 1];
+        }
+
+        public RepositoryNode GetNextVisible(RepositoryNode node)
+        {
+            var visibleRows = new List<RepositoryNode>();
+            CollectVisibleRows(visibleRows, RepositoryNodes);
+
+            var idx = visibleRows.IndexOf(node);
+            if (idx < 0 || idx >= visibleRows.Count - 1)
+                return null;
+
+            return visibleRows[idx + 1];
+        }
+
         public ContextMenu CreateContextMenu(RepositoryNode node)
         {
             var menu = new ContextMenu();
@@ -212,6 +237,20 @@ namespace SourceGit.ViewModels
             }
         }
 
+        private void CollectVisibleRows(List<RepositoryNode> visible, AvaloniaList<RepositoryNode> collection)
+        {
+            foreach (var node in collection)
+            {
+                if (node.IsVisible)
+                {
+                    visible.Add(node);
+
+                    if (!node.IsRepository)
+                        CollectVisibleRows(visible, node.SubNodes);
+                }
+            }
+        }
+
         private static Welcome _instance = new Welcome();
         private string _searchFilter = string.Empty;
     }

src/Views/Welcome.axaml

@@ -42,6 +42,7 @@
                   ScrollViewer.VerticalScrollBarVisibility="Auto"
                   Loaded="SetupTreeViewDragAndDrop"
                   LostFocus="OnTreeViewLostFocus"
+                  SelectionChanged="OnTreeViewSelectionChanged"
                   KeyDown="OnTreeViewKeyDown">
           <TreeView.ContextMenu>
             <ContextMenu>

src/Views/Welcome.axaml.cs

@@ -48,7 +48,6 @@ namespace SourceGit.Views
                     if (c is TreeViewItem { IsVisible: true } item)
                     {
                         ReposTree.SelectedItem = item.DataContext;
-                        item.Focus();
                         break;
                     }
                 }
@@ -59,13 +58,41 @@ namespace SourceGit.Views
 
         private void OnTreeViewKeyDown(object sender, KeyEventArgs e)
         {
-            if (e.Key == Key.Space && ReposTree.SelectedItem is ViewModels.RepositoryNode { IsRepository: true } node)
+            if (ReposTree.SelectedItem is ViewModels.RepositoryNode node)
             {
-                var parent = this.FindAncestorOfType<Launcher>();
+                if (e.Key == Key.Space && node.IsRepository)
-                if (parent?.DataContext is ViewModels.Launcher launcher)
+                {
-                    launcher.OpenRepositoryInTab(node, null);
+                    var parent = this.FindAncestorOfType<Launcher>();
+                    if (parent?.DataContext is ViewModels.Launcher launcher)
+                        launcher.OpenRepositoryInTab(node, null);
 
-                e.Handled = true;
+                    e.Handled = true;
+                }
+                else if (e.Key == Key.Down)
+                {
+                    var next = ViewModels.Welcome.Instance.GetNextVisible(node);
+                    if (next != null)
+                        ReposTree.SelectedItem = next;
+
+                    e.Handled = true;
+                }
+                else if (e.Key == Key.Up)
+                {
+                    var prev = ViewModels.Welcome.Instance.GetPrevVisible(node);
+                    if (prev != null)
+                        ReposTree.SelectedItem = prev;
+
+                    e.Handled = true;
+                }
+            }
+        }
+
+        private void OnTreeViewSelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            if (ReposTree.SelectedItem is ViewModels.RepositoryNode node)
+            {
+                var item = FindTreeViewItemByNode(node, ReposTree);
+                item?.Focus(NavigationMethod.Directional);
             }
         }
 
@@ -264,6 +291,26 @@ namespace SourceGit.Views
             launcher?.OpenRepositoryInTab(node, launcher.ActivePage);
         }
 
+        private TreeViewItem FindTreeViewItemByNode(ViewModels.RepositoryNode node, ItemsControl container)
+        {
+            var items = container.GetRealizedContainers();
+
+            foreach (var item in items)
+            {
+                if (item is TreeViewItem { DataContext: ViewModels.RepositoryNode test } treeViewItem)
+                {
+                    if (test == node)
+                        return treeViewItem;
+
+                    var child = FindTreeViewItemByNode(node, treeViewItem);
+                    if (child != null)
+                        return child;
+                }
+            }
+
+            return null;
+        }
+
         private bool _pressedTreeNode = false;
         private Point _pressedTreeNodePosition = new Point();
         private bool _startDragTreeNode = false;