Accessing AdornerPanel from an AdornerLayout or an Adorner or a adorned Control?

Question

I am trying to add an simple Textblock as adorment to a control. But I want it to be positionned just above my adorned control.

This is the decoration creation ( the problem doesnt rely in this code):

public void AddLabelDecoration()
{
    AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);

    TextBlock textBlockMarkTooltipContent = new TextBlock();
    textBlockMarkTooltipContent.Text = "Test Label Adorner";

    _labelAdornerMarkTooltipContentAdorner = new Adorner(this)
    {
        Child = textBlockMarkTooltipContent 
    };

    adornerLayer.Add(_labelAdornerMarkTooltipContentAdorner);
}

What I cannot achieve to do, is the positionning of the Decoration, above the adorned control. I would like to use this MSDN code sample, which makes use of AdornerPanel so as to do the positionning...

However I have not figured out how to access to an AdornerPanel object so as to apply this MSDN code sample... neither from my adorned control, from the AdornedLayout, or the Adorner...

I admit I don't clear understand the WPF class hierarchy between AdornerPanel and AdornerLayout.

Any help appreciated.

Answer 1

public void AddLabelDecoration()
{
    AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);

    TextBlock textBlockMarkTooltipContent = new TextBlock();
    textBlockMarkTooltipContent.Text = "Test Label Adorner";

    AdornerPanel labelAdornerAdornerPanel = new AdornerPanel();

    // add your TextBlock to AdornerPanel
    labelAdornerAdornerPanel.Children.Add(textBlockMarkTooltipContent);

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

    // create Adorner with AdornerPanel inside
    _labelAdornerMarkTooltipContentAdorner = new Adorner(this)
    {
        Child = labelAdornerAdornerPanel
    };

    adornerLayer.Add(_labelAdornerMarkTooltipContentAdorner);
}