Annotation Label Popup

Hi there,

Sorry for late reply, we where investigating your case and found a bug connected with it. This behavior can be easily implemented when label is placed on axis:

    public class VerticalLineAnnotationWithFloatingLabel: VerticalLineAnnotation
    {
        public VerticalLineAnnotationWithFloatingLabel()
        {
            MouseEnter += OnAnnotationMouseEnter;
            MouseLeave += OnAnnotationMouseLeave;
        }

        private void OnAnnotationMouseLeave(object sender, MouseEventArgs e)
        {
            ShowLabel = false;
        }

        private void OnAnnotationMouseEnter(object sender, MouseEventArgs e)
        {
            ShowLabel = true;
        }
    }

And there is attached solution which implements it for all label placements, but it probably won’t work for you because of this bug we’ve found. To workaround it, you could try to override IsPointWithinBounds method for VerticalLineAnnotation:

public class VerticalLineAnnotationWithFloatingLabel: VerticalLineAnnotation
    {
        public override bool IsPointWithinBounds(System.Windows.Point point)
        {
            var rootGrid = AnnotationRoot as Grid;

            var tPoint = rootGrid.TranslatePoint(point, rootGrid);

            bool withinBounds = (tPoint.X <= rootGrid.ActualWidth && tPoint.X >= 0)
                                && (tPoint.Y <= rootGrid.ActualHeight && tPoint.Y >= 0);

            return withinBounds;
        }
    }

Use this class instead of VerticalLineAnnotation in attached solution.

Please, let us know if it helps!

Best regards,
Yuriy