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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/rendering.dart';
import 'package:test/test.dart';
import 'rendering_tester.dart';
class TestBlockPainter extends RenderObjectPainter {
@override
void paint(PaintingContext context, Offset offset) { }
}
void main() {
test('overlay painters can attach and detach', () {
TestBlockPainter first = new TestBlockPainter();
TestBlockPainter second = new TestBlockPainter();
RenderList list = new RenderList(overlayPainter: first);
// The first painter isn't attached because we haven't attached block.
expect(first.renderObject, isNull);
expect(second.renderObject, isNull);
list.overlayPainter = second;
expect(first.renderObject, isNull);
expect(second.renderObject, isNull);
layout(list);
expect(first.renderObject, isNull);
expect(second.renderObject, equals(list));
list.overlayPainter = first;
expect(first.renderObject, equals(list));
expect(second.renderObject, isNull);
});
}