Prevent Automatic Horizontal Scroll in TreeView

Question

Whenever a node is selected in my treeview, it automatically does a horizontal scroll to that item. Is there a way to disable this?

Answer 1

Matthew, I manged to preserve vertical scrolling, and only prevent horizontal scrolling by restoring the horizontal position after a scroll caused by the RequestBringIntoView event .

private double treeViewHorizScrollPos = 0.0;
private bool treeViewResetHorizScroll = false;
private ScrollViewer treeViewScrollViewer = null;

private void TreeViewItemRequestBringIntoView( object sender, RequestBringIntoViewEventArgs e )
{
    if ( this.treeViewScrollViewer == null )
    {
        this.treeViewScrollViewer = this.DetailsTree.Template.FindName( "_tv_scrollviewer_", this.DetailsTree ) as ScrollViewer;
        if( this.treeViewScrollViewer != null )
            this.treeViewScrollViewer.ScrollChanged += new ScrollChangedEventHandler( this.TreeViewScrollViewerScrollChanged );
    }
    this.treeViewResetHorizScroll = true;
    this.treeViewHorizScrollPos = this.treeViewScrollViewer.HorizontalOffset;
}

private void TreeViewScrollViewerScrollChanged( object sender, ScrollChangedEventArgs e )
{
    if ( this.treeViewResetHorizScroll )
        this.treeViewScrollViewer.ScrollToHorizontalOffset( this.treeViewHorizScrollPos );

    this.treeViewResetHorizScroll = false;
}