public static FocusOrder of(BuildContext context, bool nullOk = false)
{
D.assert(context != null);
FocusTraversalOrder marker = context.getElementForInheritedWidgetOfExactType <FocusTraversalOrder>()?.widget as FocusTraversalOrder;
FocusOrder order = marker?.order;
if (order == null && !nullOk)
{
throw new UIWidgetsError("FocusTraversalOrder.of() was called with a context that " +
"does not contain a TraversalOrder widget. No TraversalOrder widget " +
"ancestor could be found starting from the context that was passed to " +
"FocusTraversalOrder.of().\n" +
"The context used was:\n" +
$" {context}");
}
return(order);
}
protected override int doCompare(FocusOrder other)
{
other = (LexicalFocusOrder)other;
return(order.CompareTo(((LexicalFocusOrder)other).order));
}
protected override int doCompare(FocusOrder other)
{
other = (NumericFocusOrder)other;
return(order.CompareTo(((NumericFocusOrder)other).order));
}
protected abstract int doCompare(FocusOrder other);
public FocusTraversalOrder(Key key = null, FocusOrder order = null, Widget child = null)
: base(key: key, child: child)
{
this.order = order;
}
