From 764a8cffb826a4cebfdddbac868c84e732ea26e8 Mon Sep 17 00:00:00 2001
From: Meik <meik.drechsler@consulting4it.de>
Date: Mon, 9 Feb 2026 21:07:39 +0100
Subject: [PATCH] generic hierarchical control

---
 .../HierarchicalSelectionControl.xaml         |  4 +-
 .../HierarchicalSelectionControl.xaml.cs      | 55 +++++++++----------
 2 files changed, 27 insertions(+), 32 deletions(-)

diff --git a/FasdDesktopUi/Basics/UserControls/HierarchicalSelectionControl.xaml b/FasdDesktopUi/Basics/UserControls/HierarchicalSelectionControl.xaml
index 2ac439f..35ad628 100644
--- a/FasdDesktopUi/Basics/UserControls/HierarchicalSelectionControl.xaml
+++ b/FasdDesktopUi/Basics/UserControls/HierarchicalSelectionControl.xaml
@@ -105,12 +105,12 @@
                                     Padding="4"
                                     BorderBrush="{DynamicResource BackgroundColor.Menu.SubCategory.Hover}"
                                     BorderThickness="1">
-                                <ScrollViewer x:Name="PART_CategoryScrollViewer"
+                                <ScrollViewer x:Name="PART_ItemsScrollViewer"
                                               MaxHeight="320"
                                               VerticalScrollBarVisibility="Auto"
                                               Background="Transparent"
                                               BorderThickness="0"
-                                              PreviewMouseWheel="CategoryScrollViewer_PreviewMouseWheel">
+                                              PreviewMouseWheel="ItemsScrollViewer_PreviewMouseWheel">
                                     <TreeView x:Name="PART_TreeView"
                                               Background="Transparent"
                                               BorderThickness="0"
diff --git a/FasdDesktopUi/Basics/UserControls/HierarchicalSelectionControl.xaml.cs b/FasdDesktopUi/Basics/UserControls/HierarchicalSelectionControl.xaml.cs
index b79ab7f..48b5d8c 100644
--- a/FasdDesktopUi/Basics/UserControls/HierarchicalSelectionControl.xaml.cs
+++ b/FasdDesktopUi/Basics/UserControls/HierarchicalSelectionControl.xaml.cs
@@ -8,7 +8,6 @@ using System.Windows.Controls;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Threading;
-using static C4IT.Logging.cLogManager;
 
 namespace FasdDesktopUi.Basics.UserControls
 {
@@ -22,7 +21,7 @@ namespace FasdDesktopUi.Basics.UserControls
 
         private TextBox searchTextBox;
         private TreeView treeViewControl;
-        private ScrollViewer categoryScrollViewer;
+        private ScrollViewer itemsScrollViewer;
 
         public ObservableCollection<HierarchicalSelectionItem> VisibleItems => visibleItems;
 
@@ -41,7 +40,6 @@ namespace FasdDesktopUi.Basics.UserControls
             EnsureTemplateParts();
             if (treeViewControl != null)
                 treeViewControl.ItemsSource = VisibleItems;
-            UpdateDisplaySelection();
         }
 
         #region DependencyProperties
@@ -64,7 +62,6 @@ namespace FasdDesktopUi.Basics.UserControls
             {
                 control.RebuildLookup();
                 control.ApplyFilter(control.lastSearchText);
-                control.TryExpandToSelectedItem();
             }
         }
 
@@ -84,8 +81,8 @@ namespace FasdDesktopUi.Basics.UserControls
         {
             if (d is HierarchicalSelectionControl control)
             {
-                control.LogSelectedItemChange(e.NewValue as HierarchicalSelectionItem);
                 control.TryExpandToSelectedItem();
+                control.SyncTreeSelectionWithSelectedItem(bringIntoView: false);
             }
         }
 
@@ -109,6 +106,8 @@ namespace FasdDesktopUi.Basics.UserControls
 
         #endregion
 
+        #region UI Event Handling
+
         private void ComboBoxControl_DropDownOpened(object sender, EventArgs e)
         {
             EnsureTemplateParts();
@@ -116,7 +115,6 @@ namespace FasdDesktopUi.Basics.UserControls
             searchTextBox?.SelectAll();
             suppressTreeSelectionChanged = false;
             SyncTreeSelectionWithSelectedItem(bringIntoView: true);
-            LogEntry($"[CategoryPicker] DropDownOpened. Selected={SelectedItem?.FullPath ?? "<null>"}");
             DropDownOpened?.Invoke(this, e);
         }
 
@@ -124,7 +122,6 @@ namespace FasdDesktopUi.Basics.UserControls
         {
             searchDelayTimer.Stop();
             suppressTreeSelectionChanged = false;
-            LogEntry("[CategoryPicker] DropDownClosed");
             DropDownClosed?.Invoke(this, e);
         }
 
@@ -138,7 +135,6 @@ namespace FasdDesktopUi.Basics.UserControls
         {
             searchDelayTimer.Stop();
             lastSearchText = searchTextBox?.Text ?? string.Empty;
-            LogEntry($"[CategoryPicker] Search text changed: '{lastSearchText}'");
             ApplyFilter(lastSearchText);
         }
 
@@ -153,7 +149,6 @@ namespace FasdDesktopUi.Basics.UserControls
                 if (original != null && !Equals(SelectedItem, original))
                 {
                     SelectedItem = original;
-                    LogEntry($"[CategoryPicker] Tree selection changed: {original.FullPath}");
                 }
 
                 suppressTreeSelectionChanged = true;
@@ -161,6 +156,10 @@ namespace FasdDesktopUi.Basics.UserControls
             }
         }
 
+        #endregion
+
+        #region Data Preparation and Filtering
+
         private HierarchicalSelectionItem ResolveOriginalItem(HierarchicalSelectionItem item)
         {
             if (item == null)
@@ -222,7 +221,7 @@ namespace FasdDesktopUi.Basics.UserControls
                 clone.SetExpandedRecursive(true);
                 visibleItems.Add(clone);
             }
-            
+
             // If the selected item is part of current results, keep it visually selected.
             SyncTreeSelectionWithSelectedItem(bringIntoView: false);
         }
@@ -243,6 +242,10 @@ namespace FasdDesktopUi.Basics.UserControls
             }
         }
 
+        #endregion
+
+        #region Tree Selection Sync
+
         private void SyncTreeSelectionWithSelectedItem(bool bringIntoView)
         {
             if (SelectedItem == null || string.IsNullOrWhiteSpace(SelectedItem.Id))
@@ -330,6 +333,10 @@ namespace FasdDesktopUi.Basics.UserControls
             return null;
         }
 
+        #endregion
+
+        #region Template and Scroll Handling
+
         private void EnsureTemplateParts()
         {
             if (treeViewControl == null)
@@ -349,15 +356,15 @@ namespace FasdDesktopUi.Basics.UserControls
                     searchTextBox.TextChanged += SearchTextBox_TextChanged;
             }
 
-            if (categoryScrollViewer == null)
+            if (itemsScrollViewer == null)
             {
-                categoryScrollViewer = ComboBoxControl.Template.FindName("PART_CategoryScrollViewer", ComboBoxControl) as ScrollViewer;
+                itemsScrollViewer = ComboBoxControl.Template.FindName("PART_ItemsScrollViewer", ComboBoxControl) as ScrollViewer;
             }
         }
 
-        private void CategoryScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
+        private void ItemsScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
         {
-            var scroller = categoryScrollViewer ?? sender as ScrollViewer;
+            var scroller = itemsScrollViewer ?? sender as ScrollViewer;
             if (scroller == null || scroller.ScrollableHeight <= 0)
                 return;
 
@@ -392,23 +399,9 @@ namespace FasdDesktopUi.Basics.UserControls
             e.Handled = true;
         }
 
-        private void UpdateDisplaySelection()
-        {
-            // Display handled by template TextBlock bound to SelectedItem.FullPath.
-        }
+        #endregion
 
-        private void LogSelectedItemChange(HierarchicalSelectionItem newValue)
-        {
-            var description = "<null>";
-            if (newValue != null)
-            {
-                var fullPath = string.IsNullOrWhiteSpace(newValue.FullPath) ? newValue.DisplayName : newValue.FullPath;
-                var id = string.IsNullOrWhiteSpace(newValue.Id) ? "<null>" : newValue.Id;
-                description = $"{fullPath} (Id={id})";
-            }
-
-            LogEntry($"[CategoryPicker] DependencyProperty SelectedItem updated -> {description}");
-        }
+        #region Keyboard
 
         protected override void OnPreviewKeyDown(KeyEventArgs e)
         {
@@ -430,5 +423,7 @@ namespace FasdDesktopUi.Basics.UserControls
                 e.Handled = true;
             }
         }
+
+        #endregion
     }
 }