Disable the scroll of the ScrollViewer for a while

Question

I have a ScrollViewer with an ItemPresenter inside. The ItemsPresenter contains a few dropdowns, and when I open one of those, I'd like to disable the parent ScrollViewer 's scroll and only re-enable it only when the dropbox is closed.
By saying "disable" I mean prevent scrolling at all (even with the mouse wheel).

I've tried to set the VerticalScrollBarVisibility to Disabled like this:

<ScrollViewer HorizontalScrollBarVisibility="Disabled"
              VerticalScrollBarVisibility="Disabled">
   <ItemsPresenter />
</ScrollViewer>

but that doesn't work either.
It just hides the scrollbar, but the mouse wheel still works .

So, is there a way to completely disable the ScrollViewer 's scroll?

Here is the full code that I have:

<ListView.Template>
   <ControlTemplate>
      <ScrollViewer HorizontalScrollBarVisibility="Disabled"
                    VerticalScrollBarVisibility="{Binding IsScrollEnabled, Converter={StaticResource BoolToVisibilityConverter}}">
         <ItemsPresenter />
      </ScrollViewer>
   </ControlTemplate>
</ListView.Template>

PS There are lots of some similar questions like this and this , but none of them is the one I wanted.

Answer 1

You can disable scrolling by handling the PreviewMouseWheel event for the ScrollViewer .

<ScrollViewer HorizontalScrollBarVisibility="Disabled"
              VerticalScrollBarVisibility="{Binding IsScrollEnabled, Converter={StaticResource BoolToVisibilityConverter}}"
              PreviewMouseWheel="UIElement_OnPreviewMouseWheel">
   <ItemsPresenter />
</ScrollViewer>

private void UIElement_OnPreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
   e.Handled = true;
}