@Override
	public boolean dispatchUnhandledMove(View focused, int direction) {
		if (direction == View.FOCUS_LEFT) {
			if (getCurrentPage() > 0) {
				snapToPage(getCurrentPage() - 1);
				return true;
			}
		} else if (direction == View.FOCUS_RIGHT) {
			if (getCurrentPage() < getChildCount() - 1) {
				snapToPage(getCurrentPage() + 1);
				return true;
			}
		}
		return super.dispatchUnhandledMove(focused, direction);
	}
Gets the value that getScrollX() should return if the specified page is
the current page (and no other scrolling is occurring). Use this to pass
a value to scrollTo(), for example.

@param whichPage
@return
app/src/main/java/pro/alexzaitsev/freepager/library/view/core/VerticalPager.java