From eb7655ba74fc7f3f450ec83522b91c92cab2100d Mon Sep 17 00:00:00 2001
From: John Stewien <stewienj@users.noreply.github.com>
Date: Wed, 3 Feb 2021 14:59:35 +1030
Subject: [PATCH] Added performance test that adds 100,000 items to the
 collection at the press of a button for issue #8

---
 .../Controls/DataGridTestControl.xaml                     | 5 ++++-
 ExamplesAndTests/DGGroupSortFilterExample/MainWindow.xaml | 2 +-
 .../ViewModels/DataGridTestViewModel.cs                   | 8 ++++++--
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/ExamplesAndTests/DGGroupSortFilterExample/Controls/DataGridTestControl.xaml b/ExamplesAndTests/DGGroupSortFilterExample/Controls/DataGridTestControl.xaml
index 7a91719..8039f84 100644
--- a/ExamplesAndTests/DGGroupSortFilterExample/Controls/DataGridTestControl.xaml
+++ b/ExamplesAndTests/DGGroupSortFilterExample/Controls/DataGridTestControl.xaml
@@ -29,7 +29,9 @@
         </Grid.RowDefinitions>
         <DataGrid x:Name="dataGrid1"
                   ItemsSource="{Binding Source={StaticResource cvsTasks}}"
-                  CanUserAddRows="False">
+                  CanUserAddRows="False"
+                  VirtualizingPanel.IsVirtualizing="True"
+                  VirtualizingPanel.IsVirtualizingWhenGrouping="True">
             <DataGrid.GroupStyle>
                 <!-- Style for groups at top level. -->
                 <GroupStyle>
@@ -80,6 +82,7 @@
                       Checked="CompleteFilter_Changed" Unchecked="CompleteFilter_Changed">Filter completed items</CheckBox>
             <Button Content="Remove Groups" Margin="10,2,2,2" Click="UngroupButton_Click" />
             <Button Content="Group by Project/Status" Margin="2" Click="GroupButton_Click" />
+            <Button Command="{Binding Add100000ItemsCommand}">Add 100,000 Items</Button>
             <CheckBox VerticalAlignment="Center" IsChecked="{Binding ContinuouslyAddItems}" Grid.Column="0">Continuously Add Items</CheckBox>
         </StackPanel>
     </Grid>
diff --git a/ExamplesAndTests/DGGroupSortFilterExample/MainWindow.xaml b/ExamplesAndTests/DGGroupSortFilterExample/MainWindow.xaml
index 87908ab..21a8da2 100644
--- a/ExamplesAndTests/DGGroupSortFilterExample/MainWindow.xaml
+++ b/ExamplesAndTests/DGGroupSortFilterExample/MainWindow.xaml
@@ -5,7 +5,7 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:DGGroupSortFilterExample.Controls"
         mc:Ignorable="d"
-        Title="Editable DataGrid Test" Height="600" Width="600">
+        Title="Editable DataGrid Test" Height="600" Width="640">
     <Grid>
         <local:DataGridTestControl/>
     </Grid>
diff --git a/ExamplesAndTests/DGGroupSortFilterExample/ViewModels/DataGridTestViewModel.cs b/ExamplesAndTests/DGGroupSortFilterExample/ViewModels/DataGridTestViewModel.cs
index 0ba8013..a3fde04 100644
--- a/ExamplesAndTests/DGGroupSortFilterExample/ViewModels/DataGridTestViewModel.cs
+++ b/ExamplesAndTests/DGGroupSortFilterExample/ViewModels/DataGridTestViewModel.cs
@@ -48,8 +48,12 @@ private void AddItemFromTimer(Object stateInfo)
             TestCollection.Add(ProjectDetails.GetNewProject());
         }
 
-        private RelayCommandFactory _addRandomItemCommand = new RelayCommandFactory();
-        public ICommand AddNewItemCommand => _addRandomItemCommand.GetCommand(() => TestCollection.Add(ProjectDetails.GetNewProject()));
+        private RelayCommandFactory _add100000ItemsCommand = new RelayCommandFactory();
+        public ICommand Add100000ItemsCommand => _add100000ItemsCommand.GetCommand(() =>
+            TestCollection.AddRange(Enumerable.Range(0,100_000).Select(i=>ProjectDetails.GetNewProject())));
+
+        private RelayCommandFactory _addNewItemCommand = new RelayCommandFactory();
+        public ICommand AddNewItemCommand => _addNewItemCommand.GetCommand(() => TestCollection.Add(ProjectDetails.GetNewProject()));
 
         private bool _continuouslyAddItems = false;
         public bool ContinuouslyAddItems