public ViewerPosition getViewerPosition() {
		if (layouts.size() > 0) {
			return new ViewerPosition(layouts.get(0).getIndex(), 0, layouts.get(0).getYPos());
		}
		return new ViewerPosition(0, 0, 0);
	}
Returns a ViewerPosition object which contains the top of screen information.
<p>
The ViewerPosition will have the index of the layout at the top of the screen and the yPos of
that layout. For example, if the layout is completely displayed, yPos will be 0. If part of
the layout is off the top off the screen, then yPos will have a negative value (indicating
that it begins above the displayable part of the screen.

@return the position
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/FieldPanel.java