refactor: NavMenu clarity and method order, NavMenuItem dedupe pointer, simplify and method order

src/Ursa/Controls/NavMenu/NavMenu.cs

@@ -69,7 +69,7 @@ public class NavMenu : ItemsControl
     public static readonly RoutedEvent<SelectionChangedEventArgs> SelectionChangedEvent =
         RoutedEvent.Register<NavMenu, SelectionChangedEventArgs>(nameof(SelectionChanged), RoutingStrategies.Bubble);
 
-    private bool _updateFromUI;
+    private bool _isSelectionFromUI = false;
 
     static NavMenu()
     {
@@ -183,21 +183,14 @@ public class NavMenu : ItemsControl
         remove => RemoveHandler(SelectionChangedEvent, value);
     }
 
-    private static void OnInputRegisteredAsToggle(InputElement input, AvaloniaPropertyChangedEventArgs<bool> e)
+    protected override bool NeedsContainerOverride(object? item, int index, out object? recycleKey)
     {
-        if (e.NewValue.Value)
+        return NeedsContainer<NavMenuItem>(item, out recycleKey);
-            input.AddHandler(PointerPressedEvent, OnElementToggle);
-        else
-            input.RemoveHandler(PointerPressedEvent, OnElementToggle);
     }
 
-    private static void OnElementToggle(object? sender, RoutedEventArgs args)
+    protected override Control CreateContainerForItemOverride(object? item, int index, object? recycleKey)
     {
-        if (sender is not InputElement input) return;
+        return new NavMenuItem();
-        var nav = input.FindLogicalAncestorOfType<NavMenu>();
-        if (nav is null) return;
-        var collapsed = nav.IsHorizontalCollapsed;
-        nav.IsHorizontalCollapsed = !collapsed;
     }
 
     protected override void OnLoaded(RoutedEventArgs e)
@@ -217,7 +210,7 @@ public class NavMenu : ItemsControl
             SelectionChangedEvent,
             new[] { args.OldValue.Value },
             new[] { args.NewValue.Value });
-        if (_updateFromUI)
+        if (_isSelectionFromUI)
         {
             RaiseEvent(a);
             return;
@@ -235,6 +228,47 @@ public class NavMenu : ItemsControl
         RaiseEvent(a);
     }
 
+    private static void OnInputRegisteredAsToggle(InputElement input, AvaloniaPropertyChangedEventArgs<bool> e)
+    {
+        if (e.NewValue.Value)
+            input.AddHandler(PointerPressedEvent, OnElementToggle);
+        else
+            input.RemoveHandler(PointerPressedEvent, OnElementToggle);
+    }
+
+    private static void OnElementToggle(object? sender, RoutedEventArgs args)
+    {
+        if (sender is not InputElement input) return;
+        var nav = input.FindLogicalAncestorOfType<NavMenu>();
+        if (nav is null) return;
+        var collapsed = nav.IsHorizontalCollapsed;
+        nav.IsHorizontalCollapsed = !collapsed;
+    }
+
+    internal void SelectItem(NavMenuItem item, NavMenuItem parent)
+    {
+        _isSelectionFromUI = true;
+        foreach (var child in LogicalChildren)
+        {
+            if (Equals(child, parent)) continue;
+            if (child is NavMenuItem navMenuItem) navMenuItem.ClearSelection();
+        }
+
+        if (item.DataContext is not null && item.DataContext != DataContext)
+            SelectedItem = item.DataContext;
+        else
+            SelectedItem = item;
+        item.BringIntoView();
+        _isSelectionFromUI = false;
+    }
+
+    private void ClearAll()
+    {
+        foreach (var child in LogicalChildren)
+            if (child is NavMenuItem item)
+                item.ClearSelection();
+    }
+
     private bool TryToSelectItem(object? item)
     {
         if (item is null) return false;
@@ -250,33 +284,6 @@ public class NavMenu : ItemsControl
         return found;
     }
 
-    protected override bool NeedsContainerOverride(object? item, int index, out object? recycleKey)
-    {
-        return NeedsContainer<NavMenuItem>(item, out recycleKey);
-    }
-
-    protected override Control CreateContainerForItemOverride(object? item, int index, object? recycleKey)
-    {
-        return new NavMenuItem();
-    }
-
-    internal void SelectItem(NavMenuItem item, NavMenuItem parent)
-    {
-        _updateFromUI = true;
-        foreach (var child in LogicalChildren)
-        {
-            if (Equals(child, parent)) continue;
-            if (child is NavMenuItem navMenuItem) navMenuItem.ClearSelection();
-        }
-
-        if (item.DataContext is not null && item.DataContext != DataContext)
-            SelectedItem = item.DataContext;
-        else
-            SelectedItem = item;
-        item.BringIntoView();
-        _updateFromUI = false;
-    }
-
     private IEnumerable<NavMenuItem> GetLeafMenus()
     {
         foreach (var child in LogicalChildren)
@@ -286,11 +293,4 @@ public class NavMenu : ItemsControl
                 foreach (var leaf in leafs) yield return leaf;
             }
     }
-
-    private void ClearAll()
-    {
-        foreach (var child in LogicalChildren)
-            if (child is NavMenuItem item)
-                item.ClearSelection();
-    }
 }

src/Ursa/Controls/NavMenu/NavMenuItem.cs

@@ -18,7 +18,12 @@ namespace Ursa.Controls;
 /// <summary>
 ///     Navigation Menu Item
 /// </summary>
-[PseudoClasses(PC_Highlighted, PC_HorizontalCollapsed, PC_VerticalCollapsed, PC_FirstLevel, PC_Selector)]
+[PseudoClasses(
+    PC_Highlighted,
+    PC_HorizontalCollapsed,
+    PC_VerticalCollapsed,
+    PC_FirstLevel,
+    PC_Selector)]
 public class NavMenuItem : HeaderedItemsControl
 {
     public const string PC_Highlighted = ":highlighted";
@@ -27,8 +32,6 @@ public class NavMenuItem : HeaderedItemsControl
     public const string PC_VerticalCollapsed = ":vertical-collapsed";
     public const string PC_Selector = ":selector";
 
-    private static readonly Point InvalidPoint = new(double.NaN, double.NaN);
-
     public static readonly StyledProperty<object?> IconProperty = AvaloniaProperty.Register<NavMenuItem, object?>(
         nameof(Icon));
 
@@ -72,7 +75,7 @@ public class NavMenuItem : HeaderedItemsControl
     private bool _isHighlighted;
     private int _level;
     private Panel? _overflowPanel;
-    private Point _pointerDownPoint = InvalidPoint;
+    private bool _isPointerDown = false;
     private Popup? _popup;
 
     private NavMenu? _rootMenu;
@@ -157,23 +160,6 @@ public class NavMenuItem : HeaderedItemsControl
         set => SetValue(IsSeparatorProperty, value);
     }
 
-    private void OnIsHorizontalCollapsedChanged(AvaloniaPropertyChangedEventArgs<bool> args)
-    {
-        if (args.NewValue.Value)
-        {
-            if (ItemsPanelRoot is OverflowStackPanel s) s.MoveChildrenToOverflowPanel();
-        }
-        else
-        {
-            if (ItemsPanelRoot is OverflowStackPanel s) s.MoveChildrenToMainPanel();
-        }
-    }
-
-    private void OnLevelChange(AvaloniaPropertyChangedEventArgs<int> args)
-    {
-        PseudoClasses.Set(PC_FirstLevel, args.NewValue.Value == 1);
-    }
-
     protected override bool NeedsContainerOverride(object? item, int index, out object? recycleKey)
     {
         return NeedsContainer<NavMenuItem>(item, out recycleKey);
@@ -230,82 +216,50 @@ public class NavMenuItem : HeaderedItemsControl
         var p = e.GetCurrentPoint(this);
         if (p.Properties.PointerUpdateKind is not (PointerUpdateKind.LeftButtonPressed
             or PointerUpdateKind.RightButtonPressed)) return;
+
         if (p.Pointer.Type == PointerType.Mouse)
-        {
+            ActivateMenuItem(e);
-            if (ItemCount == 0)
-            {
-                SelectItem(this);
-                Command?.Execute(CommandParameter);
-                e.Handled = true;
-            }
         else
-            {
+            _isPointerDown = true;
-                if (!IsHorizontalCollapsed)
-                {
-                    SetCurrentValue(IsVerticalCollapsedProperty, !IsVerticalCollapsed);
-                    e.Handled = true;
-                }
-                else
-                {
-                    if (_popup is null || e.Source is not Visual v || _popup.IsInsidePopup(v)) return;
-                    if (_popup.IsOpen)
-                        _popup.Close();
-                    else
-                        _popup.Open();
-                }
-            }
-        }
-        else
-        {
-            _pointerDownPoint = p.Position;
-        }
     }
 
     protected override void OnPointerReleased(PointerReleasedEventArgs e)
     {
         base.OnPointerReleased(e);
-        if (!e.Handled && !double.IsNaN(_pointerDownPoint.X) &&
+
-            e.InitialPressMouseButton is MouseButton.Left or MouseButton.Right)
+        if (e.Handled || !_isPointerDown) return;
+
+        _isPointerDown = false;
+
+        if (e.InitialPressMouseButton is MouseButton.Left or MouseButton.Right)
         {
             var point = e.GetCurrentPoint(this);
-            if (!new Rect(Bounds.Size).ContainsExclusive(point.Position) || e.Pointer.Type != PointerType.Touch) return;
+            if (new Rect(Bounds.Size).ContainsExclusive(point.Position) && e.Pointer.Type == PointerType.Touch)
-            if (ItemCount == 0)
+                ActivateMenuItem(e);
+        }
+    }
+
+    private void OnIsHorizontalCollapsedChanged(AvaloniaPropertyChangedEventArgs<bool> args)
     {
-                SelectItem(this);
+        if (args.NewValue.Value)
-                Command?.Execute(CommandParameter);
+        {
-                e.Handled = true;
+            if (ItemsPanelRoot is OverflowStackPanel s) s.MoveChildrenToOverflowPanel();
         }
         else
         {
-                if (!IsHorizontalCollapsed)
+            if (ItemsPanelRoot is OverflowStackPanel s) s.MoveChildrenToMainPanel();
+        }
+    }
+
+    private void OnLevelChange(AvaloniaPropertyChangedEventArgs<int> args)
     {
-                    SetCurrentValue(IsVerticalCollapsedProperty, !IsVerticalCollapsed);
+        PseudoClasses.Set(PC_FirstLevel, args.NewValue.Value == 1);
-                    e.Handled = true;
-                }
-                else
-                {
-                    if (_popup is null || e.Source is not Visual v || _popup.IsInsidePopup(v)) return;
-                    if (_popup.IsOpen)
-                        _popup.Close();
-                    else
-                        _popup.Open();
-                }
-            }
-        }
     }
 
     internal void SelectItem(NavMenuItem item)
     {
-        if (item == this)
+        SetCurrentValue(IsSelectedProperty, item == this);
-        {
-            SetCurrentValue(IsSelectedProperty, true);
         SetCurrentValue(IsHighlightedProperty, true);
-        }
-        else
-        {
-            SetCurrentValue(IsSelectedProperty, false);
-            SetCurrentValue(IsHighlightedProperty, true);
-        }
 
         if (Parent is NavMenuItem menuItem)
         {
@@ -320,7 +274,7 @@ public class NavMenuItem : HeaderedItemsControl
             menu.SelectItem(item, this);
         }
 
-        if (_popup is not null) _popup.Close();
+        _popup?.Close();
     }
 
     internal void ClearSelection()
@@ -332,23 +286,40 @@ public class NavMenuItem : HeaderedItemsControl
                 item.ClearSelection();
     }
 
-    private NavMenu? GetRootMenu()
+    private void SelectAndExecute()
     {
-        var root = this.FindAncestorOfType<NavMenu>() ?? this.FindLogicalAncestorOfType<NavMenu>();
+        SelectItem(this);
-        return root;
+        Command?.Execute(CommandParameter);
     }
 
-    private static int CalculateDistanceFromLogicalParent<T>(ILogical? logical, int @default = -1) where T : class
+    private void ActivateMenuItem(RoutedEventArgs e)
     {
-        var result = 0;
+        if (ItemCount == 0)
-
-        while (logical != null && !(logical is T))
         {
-            if (logical is NavMenuItem) result++;
+            SelectAndExecute();
-            logical = logical.LogicalParent;
+            e.Handled = true;
+            return;
         }
 
-        return logical != null ? result : @default;
+        if (!IsHorizontalCollapsed)
+        {
+            SetCurrentValue(IsVerticalCollapsedProperty, !IsVerticalCollapsed);
+            e.Handled = true;
+        }
+        else if (_popup is not null)
+        {
+            TogglePopup(e.Source, true, !_popup.IsOpen);
+        }
+    }
+
+    private void TogglePopup(object? source, bool outsidePopup, bool open)
+    {
+        if (ItemCount > 0 &&
+            _popup is not null &&
+            source is Visual visual &&
+            _popup.IsInsidePopup(visual) != outsidePopup &&
+            _popup.IsOpen != open)
+            _popup.IsOpen = open;
     }
 
     internal IEnumerable<NavMenuItem> GetLeafMenus()
@@ -366,4 +337,23 @@ public class NavMenuItem : HeaderedItemsControl
                 foreach (var i in items) yield return i;
             }
     }
+
+    private NavMenu? GetRootMenu()
+    {
+        var root = this.FindAncestorOfType<NavMenu>() ?? this.FindLogicalAncestorOfType<NavMenu>();
+        return root;
+    }
+
+    private static int CalculateDistanceFromLogicalParent<T>(ILogical? logical, int @default = -1) where T : class
+    {
+        var result = 0;
+
+        while (logical is not null and not T)
+        {
+            if (logical is NavMenuItem) result++;
+            logical = logical.LogicalParent;
+        }
+
+        return logical is not null ? result : @default;
+    }
 }