event when item is visible, and getOffsetHeight isn't 0

I'm working on a widget and need to do calculations based on it's
height in order to layout its child components. So i do something like
this:

@Override
public void setHeight(String height) {

   super.setHeight(height);
   ...do height calculations
}

The problem i'm having is that setHeight is called before the widget
is visible on the screen, and therefore, I can't do the calculation
because getOffsetHeight is equal to zero.

Is there a method I can override or an event I can subscribe to that
tells me when the widget is visible and has been laid out on the
screen, at which point i could run the calculation?


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