Disable scrolling in ScrollViewer child of a Frame which has a ScrollViewer as parent

Question

State

I have a Page (Page_Child) with a ScrollViewer (ScrollViewer_Child) in a Frame (Frame_Parent) which is the child of my parent ScrollViewer (ScrollViewer_Parent).

<ScrollViewer Name="ScrollViewer_Parent">
    <StackPanel>
        <Frame Name="Frame_Parent">
            <Frame.Content>

                <Page Name="Page_Child">
                    <ScrollViewer Name="ScrollViewer_Child">
                        <!-- Page Content -->
                    </ScrollViewer>
                </Page>

            </Frame.Content>
        </Frame>
        <!-- ... -->
    </StackPanel>
</ScrollViewer>

Problem

What I try to achieve is to disable the ScrollViewer in the Frame as the parent ScrollViewer can handle all of the seizing thanks to the not fixed height of the Frame. - Or at least let the parent continue scrolling when the child reached the top or the bottom.

Sadly I can't use any external resources or libraries, nor can I remove the child ScrollViewer as it's visualized somewhere else in my application.

Question

Is there a way of telling the frame content to disable scrolling or how to archive the continues scrolling through the frame?

What about using a behaviour so if the frame receives a mousewheel event it will bubble it up to the scroll viewer. I've used the solution here https://stackoverflow.com/a/16110178/5084488 before and it works really well — Alfie, May 23 '19 at 09:03
@Alfie cannot use any DLL's or external resources for my application (only able to use the standard windows libraries and .NET 4.0) :/ — Hille, May 23 '19 at 09:10
oh okay, you could try do the same thing but just in code behind by attaching void `Frame_Parent_PreviewMouseWheel(object sender, MouseWheelEventArgs e) { e.Handled = true; ScrollViewer_Parent.RaiseEvent(e); }` to the PreviewMouseWheel event of Frame_Parent? Or have I misinterpreted you? — Alfie, May 23 '19 at 09:34
I misunderstood you, your solution is perfect, though I need this interactive stuff - would you like to write an answer so I can give you the accepted answer badge? — Hille, May 23 '19 at 09:51

Alfie · Accepted Answer · 2019-05-23T10:19:06.803

If you were able to use external libraries you could use the behaviour here: BubbleScrollEvent Behaviour, but as you cannot you can simply just write a similar thing but in the code behind;

by attaching a method to the PreviewMouseWheel event of Frame which will route the event to the ScrollViewer like so:

<ScrollViewer Name="ScrollViewer_Parent">
    <StackPanel PreviewMouseWheel="BubblePreviewMouseWheel">
        <Frame Name="Frame_Parent" PreviewMouseWheel="BubblePreviewMouseWheel" />
            ...
    </StackPanel>
</ScrollViewer>


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

Edit: Just realised it would raise the event to the StackPanel so you would need to attach BubblePreviewMouseWheel to the StackPanel as well.

Disable scrolling in ScrollViewer child of a Frame which has a ScrollViewer as parent

State

Problem

Question

1 Answers1