How to know if Graphic object is being displayed?

[alchimiste]

You could check View.visibility, perhaps?

I say, it's not only for View, but also all graphic.
For example, we can change screens by using Frame and it's add method.

Code:

{def frame = {Frame}}
{def child1 = {Frame "Child1"}}
{def child2 = {Frame "Child2"}}
{VBox
    frame,
    {HBox
        {CommandButton
            label="show child1",
            {on Action do
                {frame.add child1, replace?=true}
            }
        },
        {CommandButton
            label="show child2",
            {on Action do
                {frame.add child2, replace?=true}
            }
        }
    }
}

If we must check whether child1 is showed, how can we do it?
And I also want to know how to check if the browser or detached curl window is displayed actually.