public static FocusScopeNode of(BuildContext context)
{
D.assert(context != null);
_FocusMarker marker = context.dependOnInheritedWidgetOfExactType <_FocusMarker>();
return(marker?.notifier?.nearestScope ?? context.owner.focusManager.rootScope);
}
public static FocusNode of(BuildContext context, bool nullOk = false, bool scopeOk = false)
{
D.assert(context != null);
_FocusMarker marker = context.dependOnInheritedWidgetOfExactType <_FocusMarker>();
FocusNode node = marker?.notifier;
if (node == null)
{
if (!nullOk)
{
throw new UIWidgetsError(
"Focus.of() was called with a context that does not contain a Focus widget.\n" +
"No Focus widget ancestor could be found starting from the context that was passed to " +
"Focus.of(). This can happen because you are using a widget that looks for a Focus " +
"ancestor, and do not have a Focus widget descendant in the nearest FocusScope.\n" +
"The context used was:\n" +
$" {context}"
);
}
return(null);
}
if (!scopeOk && node is FocusScopeNode)
{
if (!nullOk)
{
throw new UIWidgetsError(
"Focus.of() was called with a context that does not contain a Focus between the given " +
"context and the nearest FocusScope widget.\n" +
"No Focus ancestor could be found starting from the context that was passed to " +
"Focus.of() to the point where it found the nearest FocusScope widget. This can happen " +
"because you are using a widget that looks for a Focus ancestor, and do not have a " +
"Focus widget ancestor in the current FocusScope.\n" +
"The context used was:\n" +
$" {context}"
);
}
return(null);
}
return(node);
}
