From e5547c945f04ae31688d290e19b6ad041625a35b Mon Sep 17 00:00:00 2001
From: Ivo Petrov <48355182+ivaylo-matov@users.noreply.github.com>
Date: Tue, 24 Sep 2024 15:14:44 +0100
Subject: [PATCH] mouse scroll works in DataGrids (#60)

---
 TuneUp/TuneUpWindow.xaml    | 91 ++++++++++++++++++-------------------
 TuneUp/TuneUpWindow.xaml.cs | 42 +++++++++++++++++
 2 files changed, 86 insertions(+), 47 deletions(-)

diff --git a/TuneUp/TuneUpWindow.xaml b/TuneUp/TuneUpWindow.xaml
index f9599d3..3c6ae7f 100644
--- a/TuneUp/TuneUpWindow.xaml
+++ b/TuneUp/TuneUpWindow.xaml
@@ -454,21 +454,20 @@
             Grid.Column="0"
             Grid.ColumnSpan="2">
             <ScrollViewer VerticalScrollBarVisibility="Auto">
-                <StackPanel>
-                    <!--  Latest Run  -->
-                    <TextBlock
-                        Style="{StaticResource CollectionHeaderTextBlockStyle}"
-                        Text="Latest run"
-                        Visibility="{Binding LatestRunTableVisibility}" />
-                    <DataGrid
-                        x:Name="LatestRunTable"
-                        AlternatingRowBackground="#434343"
-                        ItemsSource="{Binding Path=ProfiledNodesCollectionLatestRun.View}"
-                        MouseLeave="NodeAnalysisTable_MouseLeave"
-                        PreviewMouseDown="NodeAnalysisTable_PreviewMouseDown"
-                        SelectionChanged="NodeAnalysisTable_SelectionChanged"
-                        Sorting="LatestRunTable_Sorting"
-                        Style="{StaticResource DataGridStyleTuneUpCombined}">
+                <StackPanel >
+                    <!-- Latest Run -->
+                    <TextBlock Text="Latest run"
+                               Style="{StaticResource CollectionHeaderTextBlockStyle}"
+                               Visibility="{Binding LatestRunTableVisibility}"/>
+                    <DataGrid ItemsSource="{Binding Path=ProfiledNodesCollectionLatestRun.View}"
+                              x:Name="LatestRunTable"
+                              Style="{StaticResource DataGridStyleTuneUpCombined}"
+                              AlternatingRowBackground="#434343"
+                              Sorting="LatestRunTable_Sorting"
+                              SelectionChanged="NodeAnalysisTable_SelectionChanged"
+                              PreviewMouseDown="NodeAnalysisTable_PreviewMouseDown"
+                              MouseLeave="NodeAnalysisTable_MouseLeave"
+                              PreviewMouseWheel="DataGrid_PreviewMouseWheel">
                         <DataGrid.Columns>
                             <!--  Execution Order  -->
                             <DataGridTextColumn Width="40" Header="#">
@@ -514,21 +513,20 @@
                             Style="{StaticResource CollectionFooterTextBlockStyle}"
                             Text="{Binding Path=LatestGraphExecutionTime, Mode=OneWay}" />
                     </StackPanel>
-                    <!--  Previous Run  -->
-                    <TextBlock
-                        Style="{StaticResource CollectionHeaderTextBlockStyle}"
-                        Text="Previous run"
-                        Visibility="{Binding PreviousRunTableVisibility}" />
-                    <DataGrid
-                        x:Name="PreviousRunTable"
-                        AlternatingRowBackground="#434343"
-                        HeadersVisibility="None"
-                        ItemsSource="{Binding Path=ProfiledNodesCollectionPreviousRun.View}"
-                        MouseLeave="NodeAnalysisTable_MouseLeave"
-                        PreviewMouseDown="NodeAnalysisTable_PreviewMouseDown"
-                        SelectionChanged="NodeAnalysisTable_SelectionChanged"
-                        Sorting="LatestRunTable_Sorting"
-                        Style="{StaticResource DataGridStyleTuneUpCombined}">
+                    <!-- Previous Run -->
+                    <TextBlock Text="Previous run"
+                               Style="{StaticResource CollectionHeaderTextBlockStyle}"
+                               Visibility="{Binding PreviousRunTableVisibility}"/>
+                    <DataGrid ItemsSource="{Binding Path=ProfiledNodesCollectionPreviousRun.View}"
+                              x:Name="PreviousRunTable"
+                              Style="{StaticResource DataGridStyleTuneUpCombined}"
+                              AlternatingRowBackground="#434343"
+                              HeadersVisibility="None"
+                              Sorting="LatestRunTable_Sorting"
+                              SelectionChanged="NodeAnalysisTable_SelectionChanged"
+                              PreviewMouseDown="NodeAnalysisTable_PreviewMouseDown"
+                              MouseLeave="NodeAnalysisTable_MouseLeave"
+                              PreviewMouseWheel="DataGrid_PreviewMouseWheel">
                         <DataGrid.Columns>
                             <!--  Execution Order  -->
                             <DataGridTextColumn Width="40" Binding="{Binding Converter={StaticResource ExecutionOrderNumberConverter}}">
@@ -570,23 +568,22 @@
                             Style="{StaticResource CollectionFooterTextBlockStyle}"
                             Text="{Binding Path=PreviousGraphExecutionTime, Mode=OneWay}" />
                     </StackPanel>
-                    <!--  Not Executed  -->
-                    <TextBlock
-                        Style="{StaticResource CollectionHeaderTextBlockStyle}"
-                        Text="Not executed"
-                        Visibility="{Binding NotExecutedTableVisibility}" />
-                    <DataGrid
-                        x:Name="NotExecutedTable"
-                        AlternatingRowBackground="#434343"
-                        AlternationCount="2"
-                        CanUserSortColumns="False"
-                        HeadersVisibility="None"
-                        ItemsSource="{Binding Path=ProfiledNodesCollectionNotExecuted.View}"
-                        MouseLeave="NodeAnalysisTable_MouseLeave"
-                        PreviewMouseDown="NodeAnalysisTable_PreviewMouseDown"
-                        SelectionChanged="NodeAnalysisTable_SelectionChanged"
-                        Sorting="NotExecutedTable_Sorting"
-                        Style="{StaticResource DataGridStyleTuneUpCombined}">
+                    <!-- Not Executed -->
+                    <TextBlock Text="Not executed"
+                               Style="{StaticResource CollectionHeaderTextBlockStyle}"
+                               Visibility="{Binding NotExecutedTableVisibility}"/>
+                    <DataGrid ItemsSource="{Binding Path=ProfiledNodesCollectionNotExecuted.View}"
+                              x:Name="NotExecutedTable"
+                              Style="{StaticResource DataGridStyleTuneUpCombined}"
+                              AlternationCount="2"
+                              AlternatingRowBackground="#434343"
+                              HeadersVisibility="None"
+                              CanUserSortColumns="False"
+                              Sorting="NotExecutedTable_Sorting"
+                              SelectionChanged="NodeAnalysisTable_SelectionChanged"
+                              PreviewMouseDown="NodeAnalysisTable_PreviewMouseDown"
+                              MouseLeave="NodeAnalysisTable_MouseLeave"
+                              PreviewMouseWheel="DataGrid_PreviewMouseWheel">   
                         <DataGrid.Columns>
                             <!--  Execution Order  -->
                             <DataGridTextColumn Width="40" />
diff --git a/TuneUp/TuneUpWindow.xaml.cs b/TuneUp/TuneUpWindow.xaml.cs
index 9cb571d..23b8a12 100644
--- a/TuneUp/TuneUpWindow.xaml.cs
+++ b/TuneUp/TuneUpWindow.xaml.cs
@@ -97,6 +97,48 @@ private void NodeAnalysisTable_MouseLeave(object sender, System.Windows.Input.Mo
             isUserInitiatedSelection = false;
         }
 
+        /// <summary>
+        /// Forwards the mouse wheel scroll event from the DataGrid to the parent ScrollViewer,
+        /// enabling scrolling when the mouse is over the DataGrid.
+        /// </summary>
+        private void DataGrid_PreviewMouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
+        {
+            ScrollViewer scrollViewer = FindParent<ScrollViewer>((DataGrid)sender);
+
+            if (scrollViewer != null)
+            {
+                if (e.Delta > 0)
+                {
+                    scrollViewer.LineUp();
+                }
+                else
+                {
+                    scrollViewer.LineDown();
+                }
+
+                e.Handled = true;
+            }
+        }
+
+        /// <summary>
+        /// Recursively searches the visual tree to find the parent of the specified type T for a given child element.
+        /// </summary>
+        private T FindParent<T>(DependencyObject child) where T : DependencyObject
+        {
+            DependencyObject parentObject = VisualTreeHelper.GetParent(child);
+            if (parentObject == null) return null;
+
+            T parent = parentObject as T;
+            if (parent != null)
+            {
+                return parent;
+            }
+            else
+            {
+                return FindParent<T>(parentObject);
+            }
+        }
+
         private void RecomputeGraph_Click(object sender, RoutedEventArgs e)
         {
             (LatestRunTable.DataContext as TuneUpWindowViewModel).ResetProfiling();