Reenable scrolling (partially)

Business/Menus.cs

@@ -163,7 +163,6 @@ namespace SystemTrayMenu.Business
 
                         Menu menuLoading = Create(menuDataLoading, new DirectoryInfo(rowData.Path).Name);
                         menuLoading.IsLoadingMenu = true;
-                        AdjustMenusSizeAndLocation();
                         menus[rowData.Level + 1] = menuLoading;
                         menuLoading.Tag = menuDataLoading.RowDataParent = rowData;
                         menuDataLoading.RowDataParent.SubMenu = menuLoading;
@@ -614,8 +613,8 @@ namespace SystemTrayMenu.Business
             menu.AdjustControls(title, menuData.Validity);
             menu.UserClickedOpenFolder += () => OpenFolder(path);
             menu.Level = menuData.Level;
-#if TODO // MouseWeel and Misc MouseEvents
+            menu.Scrolled += AdjustMenusSizeAndLocation; // TODO: Only update vertical location while scrolling?
-            menu.MouseWheel += AdjustMenusSizeAndLocation;
+#if TODO // Misc MouseEvents
             menu.MouseLeave += waitLeave.Start;
             menu.MouseEnter += waitLeave.Stop;
 #endif
@@ -663,7 +662,7 @@ namespace SystemTrayMenu.Business
                 }
             }
 
-            menu.IsVisibleChanged += (sender, _) => MenuVisibleChanged(sender, new EventArgs());
+            menu.IsVisibleChanged += (sender, _) => MenuVisibleChanged((Menu)sender);
 
             AddItemsToMenu(menuData.RowDatas, menu, out int foldersCount, out int filesCount);
 
@@ -691,9 +690,8 @@ namespace SystemTrayMenu.Business
             return menu;
         }
 
-        private void MenuVisibleChanged(object sender, EventArgs e)
+        private void MenuVisibleChanged(Menu menu)
         {
-            Menu menu = (Menu)sender;
             if (menu.IsUsable)
             {
                 AdjustMenusSizeAndLocation();
@@ -703,7 +701,6 @@ namespace SystemTrayMenu.Business
                     menu.SetType(Menu.MenuType.Main);
                     menu.ResetSearchText();
                     menu.ResetHeight();
-                    AdjustMenusSizeAndLocation();
                 }
             }
 

UserInterface/Menu.xaml

@@ -141,7 +141,7 @@
                 </Button>
             </DockPanel>
 
-            <ListView x:Name="dgv" x:FieldModifier="internal" Margin="6,0" d:ItemsSource="{d:SampleData ItemCount=5}" ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Auto" BorderBrush="{x:Null}" Background="{x:Null}">
+            <ListView x:Name="dgv" x:FieldModifier="internal" Margin="6,0" d:ItemsSource="{d:SampleData ItemCount=5}" ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Auto" BorderBrush="{x:Null}" Background="{x:Null}" ScrollViewer.ScrollChanged="HandleScrollChanged">
                 <ListView.ItemTemplate>
                     <DataTemplate>
                         <StackPanel Orientation="Horizontal" Height="{DynamicResource RowHeight}">

UserInterface/Menu.xaml.cs

@@ -133,9 +133,7 @@ namespace SystemTrayMenu.UserInterface
             MouseDown += Menu_MouseDown;
             MouseUp += Menu_MouseUp;
             MouseMove += Menu_MouseMove;
-#if TODO // MouseWeel
+
-            labelTitle.MouseWheel += new MouseEventHandler(DgvMouseWheel);
-#endif
             SolidColorBrush foreColor = new(Colors.Black);
             SolidColorBrush backColor = AppColors.Background.ToSolidColorBrush();
             SolidColorBrush backColorSearch = AppColors.SearchField.ToSolidColorBrush();
@@ -224,9 +222,9 @@ namespace SystemTrayMenu.UserInterface
                 };
         }
 
-#if TODO // MouseWeel and Misc MouseEvents
+        internal new event Action Scrolled;
-        internal new event Action MouseWheel;
 
+#if TODO // Misc MouseEvents
         internal new event Action MouseEnter;
 
         internal new event Action MouseLeave;
@@ -601,7 +599,18 @@ namespace SystemTrayMenu.UserInterface
                 changeDirectionWhenOutOfBounds = false;
             }
 
-            Loaded += (_, _) =>
+            if (IsLoaded)
+            {
+                AdjustSizeAndLocationInternal();
+            }
+            else
+            {
+                // Layout cannot be calculated during loading, postpone this event
+                // TODO: Make sure lampa capture is registered only once
+                Loaded += (_, _) => AdjustSizeAndLocationInternal();
+            }
+
+            void AdjustSizeAndLocationInternal()
             {
                 // Calculate X position
                 double x;
@@ -707,10 +716,49 @@ namespace SystemTrayMenu.UserInterface
                         y = menuPredecessor.Location.Y;
                         if (dgv.Items.Count > trigger.RowIndex)
                         {
+                            // TODO: Optimize calculation and fix calculation for items that are listed "beyond" the initial window size
+
+                            // When item is not found, it might be invalidated due to resizing or moving
+                            // After updating the layout the location should be available again.
+                            menuPredecessor.UpdateLayout();
+
                             ListViewItem? lvi = dgv.FindVisualChildOfType<ListViewItem>(trigger.RowIndex);
                             if (lvi != null)
                             {
-                                y += menuPredecessor.GetRelativeChildPositionTo(lvi).Y;
+                                double offset;
+
+                                ScrollViewer? scrollViewer = (VisualTreeHelper.GetChild(dgv, 0) as Decorator)?.Child as ScrollViewer;
+                                if (scrollViewer != null)
+                                {
+                                    if (scrollViewer.VerticalOffset > 0)
+                                    {
+                                        offset = 0D;
+                                        for (int i = 0; i < scrollViewer.VerticalOffset; i++)
+                                        {
+                                            ListViewItem? item = dgv.FindVisualChildOfType<ListViewItem>(i);
+                                            if (item != null)
+                                            {
+                                                offset += item.ActualHeight;
+                                            }
+                                        }
+
+                                        y -= (int)offset;
+                                    }
+                                }
+
+                                y += menuPredecessor.GetRelativeChildPositionTo(dgv).Y;
+
+                                offset = 0D;
+                                for (int i = 0; i < trigger.RowIndex; i++)
+                                {
+                                    ListViewItem? item = dgv.FindVisualChildOfType<ListViewItem>(i);
+                                    if (item != null)
+                                    {
+                                        offset += item.ActualHeight;
+                                    }
+                                }
+
+                                y += (int)offset;
                             }
                         }
 
@@ -748,15 +796,22 @@ namespace SystemTrayMenu.UserInterface
 
                 // Keep its size when once created.
                 SizeToContent = SizeToContent.Manual;
-            };
+            }
         }
 
         internal void ResetHeight()
         {
+            if (IsLoaded)
+            {
+                // TODO: WPF Check if this "reset" works
+                SizeToContent = SizeToContent.WidthAndHeight;
+                UpdateLayout();
+                SizeToContent = SizeToContent.Manual;
 #if TODO // SEARCH
             dgvHeightSet = false;
 #endif
             }
+        }
 
         internal void SetCounts(int foldersCount, int filesCount)
         {
@@ -922,13 +977,14 @@ namespace SystemTrayMenu.UserInterface
             ((CollectionView)CollectionViewSource.GetDefaultView(dgv.ItemsSource)).Filter = null;
         }
 
-#if TODO // MouseWheel
+        private void HandleScrollChanged(object sender, ScrollChangedEventArgs e)
-        private void DgvMouseWheel(object sender, MouseEventArgs e)
         {
-            ((HandledMouseEventArgs)e).Handled = true;
+            if (IsLoaded)
-            MouseWheel?.Invoke();
+            {
+                Scrolled?.Invoke();
             }
-#endif
+        }
+
 #if TODO // SEARCH
         private void TextBoxSearch_KeyPress(object sender, KeyPressEventArgs e)
         {

UserInterface/ShellContextMenu/ShellContextMenu.cs

@@ -858,7 +858,6 @@ namespace SystemTrayMenu.Utilities
                 }
             }
 
-
             handled = false;
             return IntPtr.Zero;
         }