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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_test/flutter_test.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:test/test.dart';
class TestMultiChildLayoutDelegate extends MultiChildLayoutDelegate {
BoxConstraints getSizeConstraints;
Size getSize(BoxConstraints constraints) {
if (!RenderObject.debugCheckingIntrinsics)
getSizeConstraints = constraints;
return new Size(200.0, 300.0);
}
Size performLayoutSize;
BoxConstraints performLayoutConstraints;
Size performLayoutSize0;
Size performLayoutSize1;
bool performLayoutIsChild;
void performLayout(Size size, BoxConstraints constraints) {
assert(!RenderObject.debugCheckingIntrinsics);
expect(() {
performLayoutSize = size;
performLayoutConstraints = constraints;
performLayoutSize0 = layoutChild(0, constraints);
performLayoutSize1 = layoutChild(1, constraints);
performLayoutIsChild = isChild('fred');
}, returnsNormally);
}
bool shouldRelayoutCalled = false;
bool shouldRelayoutValue = false;
bool shouldRelayout(_) {
assert(!RenderObject.debugCheckingIntrinsics);
shouldRelayoutCalled = true;
return shouldRelayoutValue;
}
}
Widget buildFrame(MultiChildLayoutDelegate delegate) {
return new Center(
child: new CustomMultiChildLayout(
children: <Widget>[
new LayoutId(id: 0, child: new Container(width: 150.0, height: 100.0)),
new LayoutId(id: 1, child: new Container(width: 100.0, height: 200.0)),
],
delegate: delegate
)
);
}
void main() {
test('Control test for CustomMultiChildLayout', () {
testWidgets((WidgetTester tester) {
TestMultiChildLayoutDelegate delegate = new TestMultiChildLayoutDelegate();
tester.pumpWidget(buildFrame(delegate));
expect(delegate.getSizeConstraints.minWidth, 0.0);
expect(delegate.getSizeConstraints.maxWidth, 800.0);
expect(delegate.getSizeConstraints.minHeight, 0.0);
expect(delegate.getSizeConstraints.maxHeight, 600.0);
expect(delegate.performLayoutSize.width, 200.0);
expect(delegate.performLayoutSize.height, 300.0);
expect(delegate.performLayoutConstraints.minWidth, 0.0);
expect(delegate.performLayoutConstraints.maxWidth, 800.0);
expect(delegate.performLayoutConstraints.minHeight, 0.0);
expect(delegate.performLayoutConstraints.maxHeight, 600.0);
expect(delegate.performLayoutSize0.width, 150.0);
expect(delegate.performLayoutSize0.height, 100.0);
expect(delegate.performLayoutSize1.width, 100.0);
expect(delegate.performLayoutSize1.height, 200.0);
expect(delegate.performLayoutIsChild, false);
});
});
test('Test MultiChildDelegate shouldRelayout method', () {
testWidgets((WidgetTester tester) {
TestMultiChildLayoutDelegate delegate = new TestMultiChildLayoutDelegate();
tester.pumpWidget(buildFrame(delegate));
// Layout happened because the delegate was set.
expect(delegate.performLayoutSize, isNotNull); // i.e. layout happened
expect(delegate.shouldRelayoutCalled, isFalse);
// Layout did not happen because shouldRelayout() returned false.
delegate = new TestMultiChildLayoutDelegate();
delegate.shouldRelayoutValue = false;
tester.pumpWidget(buildFrame(delegate));
expect(delegate.shouldRelayoutCalled, isTrue);
expect(delegate.performLayoutSize, isNull);
// Layout happened because shouldRelayout() returned true.
delegate = new TestMultiChildLayoutDelegate();
delegate.shouldRelayoutValue = true;
tester.pumpWidget(buildFrame(delegate));
expect(delegate.shouldRelayoutCalled, isTrue);
expect(delegate.performLayoutSize, isNotNull);
});
});
test('Nested CustomMultiChildLayouts', () {
testWidgets((WidgetTester tester) {
TestMultiChildLayoutDelegate delegate = new TestMultiChildLayoutDelegate();
tester.pumpWidget(new Center(
child: new CustomMultiChildLayout(
children: <Widget>[
new LayoutId(
id: 0,
child: new CustomMultiChildLayout(
children: <Widget>[
new LayoutId(id: 0, child: new Container(width: 150.0, height: 100.0)),
new LayoutId(id: 1, child: new Container(width: 100.0, height: 200.0)),
],
delegate: delegate
)
),
new LayoutId(id: 1, child: new Container(width: 100.0, height: 200.0)),
],
delegate: delegate
)
));
});
});
}