byElementPredicate method
Finds widgets using an element predicate
.
Sample code
expect(find.byElementPredicate(
// finds elements of type SingleChildRenderObjectElement, including
// those that are actually subclasses of that type.
// (contrast with byElementType, which only returns exact matches)
(Element element) => element is SingleChildRenderObjectElement,
description: '$SingleChildRenderObjectElement element',
), findsOneWidget);
If description
is provided, then this uses it as the description of the
Finder and appears, for example, in the error message when the finder
fails to locate the desired widget. Otherwise, the description prints the
signature of the predicate function.
If the skipOffstage
argument is true (the default), then this skips
nodes that are Offstage or that are from inactive Routes.
Implementation
Finder byElementPredicate(ElementPredicate predicate, { String description, bool skipOffstage = true }) {
return _ElementPredicateFinder(predicate, description: description, skipOffstage: skipOffstage);
}