Vertical Scrollbar does automatically "jumping" forward

Question

If i open a TreeView Item which Header is longer than the control, the scrollbar automatically jumps to the end of this item, which can be very disturbing...

Any workaround so that the scrollbar dont jump "automatically"?

https://stackoverflow.com/a/1033918/73804 – patrick Jun 13 '17 at 14:45 — patrick, Jun 13 '17 at 14:45
tried ScrollViewer.CanContentScroll="False", not working – Jul Pod Jun 13 '17 at 14:49 — Jul Pod, Jun 13 '17 at 14:49
Try VirtualizingStackPanel.IsVirtualizing="False" – patrick Jun 13 '17 at 14:55 — patrick, Jun 13 '17 at 14:55
@Patrick i just tried, no success, but thanks for help! – Jul Pod Jun 13 '17 at 14:57 — Jul Pod, Jun 13 '17 at 14:57

mm8 · Accepted Answer · 2017-06-13T14:54:35.937

3

You could try to handle the RequestBringIntoView of the TreeViewItem containers:

<TreeView>
    <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <EventSetter Event="RequestBringIntoView" Handler="OnRequestBringIntoView"/>
        </Style>
    </TreeView.ItemContainerStyle>
    ...
</TreeView>

private void OnRequestBringIntoView(object sender, RequestBringIntoViewEventArgs e) => e.Handled = true;

But please remember to always provide a Minimal, Complete, and Verifiable example of your issue when asking a question.

edited Jun 13 '17 at 14:54

answered Jun 13 '17 at 14:48

mm8

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Wuhu, @mm8 always my men! Works perfect – Jul Pod Jun 13 '17 at 14:54

score 0 · Answer 2 · answered Jun 13 '17 at 14:58

Well, you can handling the ScrollChanged event from ScrollViewer inside your TreeView.

So, you can write these lines of code here:

var element1 = VisualTreeHelper.GetChild(sender as TreeView, 0) as X; 
// Where X is the object inside your TreeView. Eg. StackPanel, Border...

var scrollviewer = VisualTreeHelper.GetChild(element1, 0) as ScrollViewer;
//Goes to the beggining of your content
scrollviewer.ScrollToLeftEnd();

// Another way is...
scrollViewer.ScrollToHorizontalOffset(e.HorizontalOffset + e.ExtentHeightChange);

Vertical Scrollbar does automatically "jumping" forward

2 Answers2