evaluate method Null safety
- WidgetTester tester
override
Evaluate whether the current state of the tester
conforms to the rule.
Implementation
@override
Future<Evaluation> evaluate(WidgetTester tester) async {
final SemanticsNode root = tester.binding.pipelineOwner.semanticsOwner!.rootSemanticsNode!;
final RenderView renderView = tester.binding.renderView;
final OffsetLayer layer = renderView.debugLayer! as OffsetLayer;
late ui.Image image;
final ByteData? byteData = await tester.binding.runAsync<ByteData?>(
() async {
// Needs to be the same pixel ratio otherwise our dimensions won't match
// the last transform layer.
final double ratio = 1 / tester.binding.window.devicePixelRatio;
image = await layer.toImage(renderView.paintBounds, pixelRatio: ratio);
return image.toByteData();
},
);
return _evaluateNode(root, tester, image, byteData!);
}