How to position tooltip bottom center

Question

I\'m trying to position my tooltip so that it would be on the bottom and center of my target object. I can position it to be just on the bottom by ToolTipService.Posti

Answer 1

I agree, the options available for positioning a ToolTip are a little limited. I think you'll have to combine Placement="Bottom" with HorizontalOffset to get Bottom/Center positioning.

To center the ToolTip relative to the PlacementTarget you can use
(PlacementTarget.ActualWidth / 2.0) - (ToolTip.ActualWidth / 2.0)

Example

CenterToolTipConverter

public class CenterToolTipConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        if (values.FirstOrDefault(v => v == DependencyProperty.UnsetValue) != null)
        {
            return double.NaN;
        }
        double placementTargetWidth = (double)values[0];
        double toolTipWidth = (double)values[1];
        return (placementTargetWidth / 2.0) - (toolTipWidth / 2.0);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

If you need to center several ToolTips you could use a Style like