Determining which CustomPopupPlacement was used for WPF Popup

Question

I\'m trying to figure out which of the passed in array of CustomPopupPlacement positions have been used when the popup actually renders. Is there any event to d

Answer 1

A better way to find placement of the Popup. This method requires a Child element to be present, but that's no problem considering the Grid that comes with a Popup element.

    UIElement container = VisualTreeHelper.GetParent(this) as UIElement;
    Point relativeLocation = this.Child.TranslatePoint(new Point(0, 0), container); //It HAS(!!!) to be this.Child

    if (relativeLocation.Y < 0) //or use X for left and right
    {
        Console.WriteLine("TOP PLACEMENT!");
    }
    else
    {
        Console.WriteLine("BOTTOM PLACEMENT!");
    }

Answer 2

I have a little hacky solution. Save the custom points as fields in the derived TooTip class and override the OnOpened method.

protected override void OnOpened(RoutedEventArgs e)
{
    base.OnOpened(e);
    var p = this.TranslatePoint(new Point(0, 0), this.PlacementTarget);
    var diff1 = this.first - p;
    var diff2 = this.second - p;

    if (Math.Abs(Math.Min(diff1.Length, diff2.Length) - diff1.Length) < 0.01)
    {
        // First Point
    }
    else
    {
        // Second Point
    }
}

Better solutions are welcome