[Solved] Expand on drag over delay

[Jamest]

I didn't see a property for this anywhere or any other mention in the forums so I thought I would provide my work around. This was desired for me because when dragging over a deep tree the user can instantly get overwhelmed with expanding branches quickly putting there original desired target out of view. If there are better ways to handle this please share.

        private RadTreeViewItem cCurrentItemDelayExpand = null;
        private int cCurrentItemHitCount = 0;
        private void myTreeView_PreviewExpanded(object sender, RadRoutedEventArgs e)
        {
            if (RadDragAndDropManager.IsDragging)
            {
                if (e.Source is RadTreeViewItem)
                {
                    if (cCurrentItemHitCount > 999) cCurrentItemHitCount = 0;
                    if ((RadTreeViewItem)e.Source == cCurrentItemDelayExpand)
                    {
                        if (cCurrentItemHitCount++ < 7)//adjust the number to fine tune your desired "delay" hit count
                            e.Handled = true;
                    }
                    else
                    {
                        cCurrentItemDelayExpand = (RadTreeViewItem)e.Source;
                        cCurrentItemHitCount = 0;
                        e.Handled = true;
                    }
                }
            }
        }

[Miroslav]

Hello Ender,

Thank you for sharing your workaround, I like how it is done with very little code!

This is not the first time we see the need for expand delay and a property to control this will appear in this week's internal build (28.Aug and onwards), the name of the property is DropExpandDelay and it defaults to 1 second.

Hopefully with your feedback, we will be able to make workarounds like this one unnecessary,

Regards,
Miroslav
the Telerik team

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[Jamest]

This is great!!! As my work around is dependent on minute mouse movement, rather than time based. Looking forward to supported implementation!

           Thanks,
              Jordan