WPF Popup hiding problem

Question

Suppose you have a ToggleButton for opening a Popup, same behaviour as all known elements as ComboBox etc.

... which is this c

Answer 1

It seems to me, there are a two problems - one is to adress the problem, that clicks inside the popup are potentially again handled according to it's the position in the visual tree.

The second problem is - autoclose via click - happens really every time you click outside the popup and can trigger additional events. Even you click the "open button" to close. The problem is - you don't know which value was set before at popup.isOpen - becase it always is false for the click eventhandler of the open button.

I don't use a toggleButton for saving memory, but i think the key problem is the same. The toggleButton already is false in the moment you click on it.

My example popup is defined like that:

If you click on the placement target - which was the "open button" the popup closes and at the same time the click event of the button was handled but the popup.IsOpen property was already 'false' - so it was opened again.

What I did to solve this was to subscribe the popups "Closed" event, saved the time - blocking reopen for a second.

DateTime? LastClose = new DateTime?();

private void Popup_Closed(object sender, EventArgs e)
{    LastClose = DateTime.Now;    }

public bool AllowReopen
{
    get {
            if ((popup == null) || (popup.IsOpen)) return false; 
            //You cannot open, when the template isn't applied or it is already open

            return !LastClose.HasValue || (DateTime.Now - LastClose.Value) > new TimeSpan(0,0,1) /*1s*/;
        }
}


public void OpenPopup()
{
     if (!AllowReopen) return;

     popup.IsOpen = true;
}