Can you attach an adorner's position to anywhere other than the upper-left of the adorned element?

Question

I can't find any way of fixing an adorner to another point of the adorned element, other than the upper-left point. I know you can move the adorner relative to this point, by implementing ArrangeOverride, but the co-ord system is always based on the top-left.

Any ideas?

Answer 1

Not that I know of. But there is one more possibility to position the Adorner content than ArrangeOverride: AdornerPanel Class. With it's AdornerPlacementCollection Methods

• PositionRelativeToAdornerHeight Method
• PositionRelativeToAdornerWidth Method
• PositionRelativeToContentHeight Method
• PositionRelativeToContentWidth Method
• SizeRelativeToAdornerDesiredHeight Method
• SizeRelativeToAdornerDesiredWidth Method
• SizeRelativeToContentHeight Method
• SizeRelativeToContentWidth Method

you can determine the position and size of your Adorner relative to adorner or content e.g. with a factor and an offset. See this sample to place the Adorner above the adorned control:

// create AdornerPanel and add your adorner content
AdornerPanel adornerPanel = new AdornerPanel();
adornerPanel.Children.Add(yourAdornerContent);

// set placements on AdornerPanel
AdornerPlacementCollection placement = new AdornerPlacementCollection();
placement.PositionRelativeToAdornerHeight(-1, 0);
placement.PositionRelativeToAdornerWidth(1, 0);
AdornerPanel.SetPlacements(adornerPanel, placement);

// create Adorner with AdornerPanel inside
Adorner adorner = new YourAdorner(adornedElement)
{
    Child = adornerPanel
};

Answer 2

This solution was perfect for me http://blogs.telerik.com/xamlteam/posts/08-05-22/wpf-series-creating-generic-adorner.aspx