Bubbling scroll events from a ListView to its parent

Question

In my WPF application I have a ListView whose ScrollViewer.VerticalScrollBarVisibility is set to Disabled. It is contained within a ScrollViewer. When I attempt to use the mouse wheel over the ListView, the outer ScrollViewer does not scroll because the ListView is capturing the scroll events.

How can I force the ListView to allow the scroll events to bubble up to the ScrollViewer?

Answer 1

I had a similar problem not long ago, but I really cannot remember how I solved it.
Anyway you might create a custom decorator to wrap the listview, so that it can intercept the "preview" events and then use it instead the bubble-way.
Hope it helps.

Answer 2

did you figure this out?

Answer 3

There are different approaches depending on your exact situation, but I found this to work nicely. Assuming your basic situation is this:

<Window Height="200" Width="200">
<Grid>
    <ScrollViewer Name="sViewer">
        <StackPanel>
            <Label Content="Scroll works here" Margin="10" />
            <ListView Name="listTest" Margin="10" 
                      PreviewMouseWheel="listTest_PreviewMouseWheel" 
                      ScrollViewer.VerticalScrollBarVisibility="Disabled">
                <ListView.ItemsSource>
                    <Int32Collection>
                        1,2,3,4,5,6,7,8,9,10
                    </Int32Collection>
                </ListView.ItemsSource>
                <ListView.View>
                    <GridView>
                        <GridViewColumn Header="Column 1" />
                    </GridView>
                </ListView.View>
            </ListView>
        </StackPanel>
    </ScrollViewer>
</Grid>
</Window>

Raising MouseWheelEvent yourself during PreviewMouseWheel seems to force the ScrollViewer to work. I wish I knew why, it seems very counterintuitive.

private void listTest_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    e.Handled = true;
    MouseWheelEventArgs e2 = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta);
    e2.RoutedEvent = UIElement.MouseWheelEvent;
    listTest.RaiseEvent(e2);
}