WPF Get the associated ListView in a GridView - wpf

Question

I'm trying to implement a custom GridView for the ListView, but I need to find a way to get the ListView that is associated with the GridView, since I need to access some of the ListView properties (Width, Items, Template...).
I found an old post that was asking the same question Get the parent listview from a gridview object but it never got an answer...
If anyone has an idea, I would be glad :)
EDIT: Here some basic code from the custom GridView
public class GridViewEx : GridView
{
public ListView Owner {get; set;} // This is what I need to get
public GridViewEx()
{
}
}
EDIT2: I found another solution than the one presented by mm8. Since I also needed a custom GridViewHeaderRowPresenter, which is used in the ListView Scrollviewer Style, here is what I came up with (as for now):
public class GridViewHeaderRowPresenterEx : GridViewHeaderRowPresenter
{
private GridViewEx _GridView;
public GridViewHeaderRowPresenterEx()
{
Loaded += OnLoaded;
Unloaded += OnUnLoaded;
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
if (this.GetVisualParent<ListView>() is ListView lv && lv.View is GridViewEx gridView)
{
_GridView = gridView;
_GridView.Owner = lv;
}
}
private void OnUnLoaded(object sender, RoutedEventArgs e)
{
if (_GridView != null)
_GridView.Owner = null;
}
}
And here is the extension method to get the ListView from the custom GridViewHeaderRowPresenter:
public static class DependencyObjectExtensions
{
public static T GetVisualParent<T>(this DependencyObject depObj) where T : DependencyObject
{
if (VisualTreeHelper.GetParent(depObj) is DependencyObject parent)
{
var result = (parent as T) ?? GetVisualParent<T>(parent);
if (result != null)
return result;
}
return null;
}
}
The GridViewHeaderRowPresenter Loaded event is called when a GridView is added to a ListView, and the Unloaded event is called when the GridView is removed from the ListView.
I prefer this solution over the one from mm8, since it required (if I'm not mistaken) the ListView to have Items in order to work.
Thanks for the suggestions :)

Answer 1

You could override the PrepareItem method and use the ItemsControl.ItemsControlFromItemContainer method to get a reference to the parent ListView:
public class GridViewEx : GridView
{
public ListView Owner { get; set; }
public GridViewEx()
{
}
protected override void PrepareItem(ListViewItem item)
{
base.PrepareItem(item);
Owner = Owner ?? ItemsControl.ItemsControlFromItemContainer(item) as ListView;
}
}

Answer 2

You can use Binding with RelativeSource and AncestorType, try the code below:
XAML:
<Grid>
<ListView ItemsSource="{Binding}">
<ListView.View>
<GridView>
<GridViewColumn Header="Name" Width="120" DisplayMemberBinding="{Binding Name}" />
<GridViewColumn Header="Age" Width="50" DisplayMemberBinding="{Binding Age}" />
<GridViewColumn Header="Mail" Width="150" DisplayMemberBinding="{Binding Mail}" />
<GridViewColumn Header="Test">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button
DataContext="{Binding Path=ItemsSource, RelativeSource={RelativeSource AncestorType={x:Type ListView}}}"
Content="Get ListView ItemsSource Count"
Click="Test_Click" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</Grid>
C#:
class User
{
public string Name { get; set; }
public int Age { get; set; }
public string Mail { get; set; }
}
public MainWindow()
{
InitializeComponent();
DataContext = new List<User>
{
new User() { Name = "John Doe", Age = 42, Mail = "john#doe-family.com" },
new User() { Name = "Jane Doe", Age = 39, Mail = "jane#doe-family.com" },
new User() { Name = "Sammy Doe", Age = 7, Mail = "sammy.doe#gmail.com" }
};
}
private void Test_Click(object sender, RoutedEventArgs e)
{
if (sender is FrameworkElement fe)
if (fe.DataContext is List<User> users)
MessageBox.Show($"ItemsSource items count: {users.Count()}.", "ListView Test");
}