Adorner and events on the decorated element

Question

I have a custom line shape that uses adorner to display an array and some text in the middle of this line.

The problem is that the decorated behaves independently of the decorated element and does not convey an event to it. In the following code, I have to manually bind adorner elements to the decorated element ( ta.MouseLeftButtonDown += Adorner_MouseLeftButtonDown;), but unfortunately even this does not work ... Can anyone advise what is wrong when you call this.OnMouseLeftButtonDown, why I do not receive the corresponding event ?

public class SegmentLine : Shape
{
    AdornerLayer aLayer;

    public static readonly DependencyProperty X1Property;
    public static readonly DependencyProperty X2Property;
    public static readonly DependencyProperty Y1Property;
    public static readonly DependencyProperty Y2Property;
    ...

    static SegmentLine() {
        X1Property = DependencyProperty.Register("X1", typeof(double), typeof(SegmentLine), new FrameworkPropertyMetadata(double.NaN,
            FrameworkPropertyMetadataOptions.AffectsRender));
        X2Pro...
    }

    public SegmentLine()
        : base()
    {
        this.Loaded += SegmentLine_Loaded;
    }

    void SegmentLine_Loaded(object sender, RoutedEventArgs e)
    {
        aLayer = AdornerLayer.GetAdornerLayer(this);
        if (aLayer != null)
        {
            TextAdorner ta = new TextAdorner(this);
            //ta.IsHitTestVisible = false;
            ta.MouseLeftButtonDown += Adorner_MouseLeftButtonDown;
            aLayer.Add(ta);
        }
    }

    void Adorner_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        // !! try to rise the MouseLeftButtonDown event
        this.OnMouseLeftButtonDown(e);
    }

    protected override void OnRender(DrawingContext drawingContext)
    {
        base.OnRender(drawingContext);
        if (aLayer != null)
            aLayer.Update();
    }

    class TextAdorner : Adorner
    {
        public TextAdorner(UIElement adornedElement)
            : base(adornedElement) { }

        protected override void OnRender(DrawingContext drawingContext)
        {
            // ADD LABEL ...
            FormattedText ft = new FormattedText(...);
            drawingContext.DrawText(ft, midPoint);

            // Add ARROW ...
            var myPathGeometry = new PathGeometry { Figures = myPathFigureCollection };            
            drawingContext.DrawGeometry(Brushes.Black, null, myPathGeometry);
        }
    }

    protected override System.Windows.Media.Geometry DefiningGeometry
    {
        get
        {
            var geometryGroup = new GeometryGroup();
            // Add line
            geometryGroup.Children.Add(new LineGeometry(new Point(X1, Y1), new Point(X2, Y2)));
            return geometryGroup;
        }
    }    
}

Answer 1

this.RaiseEvent(e); this.OnMouseLeftButtonDown(e);, .
, ,

void SegmentLine_Loaded(object sender, RoutedEventArgs e)
{
    ..
    ta.MouseLeftButtonDown += Adorner_AnyEvent;
    ta.MouseRightButtonDown += Adorner_AnyEvent;
}

void Adorner_AnyEvent(object sender, RoutedEventArgs e)
{
    this.RaiseEvent(e);
}

Answer 2

, , ( Adorner), , OnRender()

drawingContext.DrawRectangle(Brushes.Transparent, null, viewRect);

= .