will_pop_test.dart 10.3 KB
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// Copyright 2016 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/material.dart';

bool willPopValue = false;

class SamplePage extends StatefulWidget {
  @override
  SamplePageState createState() => new SamplePageState();
}

class SamplePageState extends State<SamplePage> {
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  ModalRoute<Null> _route;

  Future<bool> _callback() async => willPopValue;

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  @override
  void dependenciesChanged() {
    super.dependenciesChanged();
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    _route?.removeScopedWillPopCallback(_callback);
    _route = ModalRoute.of(context);
    _route?.addScopedWillPopCallback(_callback);
  }

  @override
  void dispose() {
    super.dispose();
    _route?.removeScopedWillPopCallback(_callback);
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  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(title: new Text('Sample Page')),
    );
  }
}

int willPopCount = 0;

class SampleForm extends StatelessWidget {
  SampleForm({ Key key, this.callback }) : super(key: key);

  final WillPopCallback callback;

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(title: new Text('Sample Form')),
      body: new SizedBox.expand(
        child: new Form(
          onWillPop: () {
            willPopCount += 1;
            return callback();
          },
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          child: new TextField(),
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        ),
      ),
    );
  }
}

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// Expose the protected hasScopedWillPopCallback getter
class TestPageRoute<T> extends MaterialPageRoute<T> {
  TestPageRoute({ WidgetBuilder builder })
    : super(builder: builder, maintainState: true, settings: const RouteSettings());

  bool get hasCallback => super.hasScopedWillPopCallback;
}


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void main() {
  testWidgets('ModalRoute scopedWillPopupCallback can inhibit back button', (WidgetTester tester) async {
    await tester.pumpWidget(
      new MaterialApp(
        home: new Scaffold(
          appBar: new AppBar(title: new Text('Home')),
          body: new Builder(
            builder: (BuildContext context) {
              return new Center(
                child: new FlatButton(
                  child: new Text('X'),
                  onPressed: () {
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                    showDialog<Null>(
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                      context: context,
                      child: new SamplePage(),
                    );
                  },
                ),
              );
            },
          ),
        ),
      ),
    );

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    expect(find.byTooltip('Back'), findsNothing);
    expect(find.text('Sample Page'), findsNothing);

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    await tester.tap(find.text('X'));
    await tester.pump();
    await tester.pump(const Duration(seconds: 1));

    expect(find.text('Sample Page'), findsOneWidget);

    willPopValue = false;
    await tester.tap(find.byTooltip('Back'));
    await tester.pump();
    await tester.pump();
    await tester.pump(const Duration(seconds: 1));
    expect(find.text('Sample Page'), findsOneWidget);

    willPopValue = true;
    await tester.tap(find.byTooltip('Back'));
    await tester.pump();
    await tester.pump();
    await tester.pump(const Duration(seconds: 1));
    expect(find.text('Sample Page'), findsNothing);
  });

  testWidgets('Form.willPop can inhibit back button', (WidgetTester tester) async {
    Widget buildFrame() {
      return new MaterialApp(
        home: new Scaffold(
          appBar: new AppBar(title: new Text('Home')),
          body: new Builder(
            builder: (BuildContext context) {
              return new Center(
                child: new FlatButton(
                  child: new Text('X'),
                  onPressed: () {
                    Navigator.of(context).push(new MaterialPageRoute<Null>(
                      builder: (BuildContext context) {
                        return new SampleForm(
                          callback: () => new Future<bool>.value(willPopValue),
                        );
                      }
                    ));
                  },
                ),
              );
            },
          ),
        ),
      );
    }

    await tester.pumpWidget(buildFrame());

    await tester.tap(find.text('X'));
    await tester.pump();
    await tester.pump(const Duration(seconds: 1));

    expect(find.text('Sample Form'), findsOneWidget);

    willPopValue = false;
    willPopCount = 0;
    await tester.tap(find.byTooltip('Back'));
    await tester.pump(); // Start the pop "back" operation.
    await tester.pump(); // Complete the willPop() Future.
    await tester.pump(const Duration(seconds: 1)); // Wait until it has finished.
    expect(find.text('Sample Form'), findsOneWidget);
    expect(willPopCount, 1);

    willPopValue = true;
    willPopCount = 0;
    await tester.tap(find.byTooltip('Back'));
    await tester.pump(); // Start the pop "back" operation.
    await tester.pump(); // Complete the willPop() Future.
    await tester.pump(const Duration(seconds: 1)); // Wait until it has finished.
    expect(find.text('Sample Form'), findsNothing);
    expect(willPopCount, 1);
  });

  testWidgets('Form.willPop callbacks do not accumulate', (WidgetTester tester) async {
    Future<bool> showYesNoAlert(BuildContext context) {
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      return showDialog<bool>(
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        context: context,
        child: new AlertDialog(
          actions: <Widget> [
            new FlatButton(
              child: new Text('YES'),
              onPressed: () { Navigator.of(context).pop(true); },
            ),
            new FlatButton(
              child: new Text('NO'),
              onPressed: () { Navigator.of(context).pop(false); },
            ),
          ],
        ),
      );
    }

    Widget buildFrame() {
      return new MaterialApp(
        home: new Scaffold(
          appBar: new AppBar(title: new Text('Home')),
          body: new Builder(
            builder: (BuildContext context) {
              return new Center(
                child: new FlatButton(
                  child: new Text('X'),
                  onPressed: () {
                    Navigator.of(context).push(new MaterialPageRoute<Null>(
                      builder: (BuildContext context) {
                        return new SampleForm(
                          callback: () => showYesNoAlert(context),
                        );
                      }
                    ));
                  },
                ),
              );
            },
          ),
        ),
      );
    }

    await tester.pumpWidget(buildFrame());

    await tester.tap(find.text('X'));
    await tester.pump();
    await tester.pump(const Duration(seconds: 1));

    expect(find.text('Sample Form'), findsOneWidget);

    // Press the Scaffold's back button. This causes the willPop callback
    // to run, which shows the YES/NO Alert Dialog. Veto the back operation
    // by pressing the Alert's NO button.
    await tester.tap(find.byTooltip('Back'));
    await tester.pump(); // Start the pop "back" operation.
    await tester.pump(); // Call willPop which will show an Alert.
    await tester.tap(find.text('NO'));
    await tester.pump(); // Start the dismiss animation.
    await tester.pump(); // Resolve the willPop callback.
    await tester.pump(const Duration(seconds: 1)); // Wait until it has finished.
    expect(find.text('Sample Form'), findsOneWidget);

    // Do it again. Note that each time the Alert is shown and dismissed
    // the FormState's dependenciesChanged() method runs. We're making sure
    // that the dependenciesChanged() method doesn't add an extra willPop
    // callback.
    await tester.tap(find.byTooltip('Back'));
    await tester.pump(); // Start the pop "back" operation.
    await tester.pump(); // Call willPop which will show an Alert.
    await tester.tap(find.text('NO'));
    await tester.pump(); // Start the dismiss animation.
    await tester.pump(); // Resolve the willPop callback.
    await tester.pump(const Duration(seconds: 1)); // Wait until it has finished.
    expect(find.text('Sample Form'), findsOneWidget);

    // This time really dismiss the SampleForm by pressing the Alert's
    // YES button.
    await tester.tap(find.byTooltip('Back'));
    await tester.pump(); // Start the pop "back" operation.
    await tester.pump(); // Call willPop which will show an Alert.
    await tester.tap(find.text('YES'));
    await tester.pump(); // Start the dismiss animation.
    await tester.pump(); // Resolve the willPop callback.
    await tester.pump(const Duration(seconds: 1)); // Wait until it has finished.
    expect(find.text('Sample Form'), findsNothing);
  });

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  testWidgets('Route.scopedWillPop callbacks do not accumulate', (WidgetTester tester) async {
    StateSetter contentsSetState; // call this to rebuild the route's SampleForm contents
    bool contentsEmpty = false; // when true, don't include the SampleForm in the route

    TestPageRoute<Null> route = new TestPageRoute<Null>(
      builder: (BuildContext context) {
        return new StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            contentsSetState = setState;
            return contentsEmpty ? new Container() : new SampleForm(key: new UniqueKey());
          }
        );
      },
    );

    Widget buildFrame() {
      return new MaterialApp(
        home: new Scaffold(
          appBar: new AppBar(title: new Text('Home')),
          body: new Builder(
            builder: (BuildContext context) {
              return new Center(
                child: new FlatButton(
                  child: new Text('X'),
                  onPressed: () {
                    Navigator.of(context).push(route);
                  },
                ),
              );
            },
          ),
        ),
      );
    }

    await tester.pumpWidget(buildFrame());

    await tester.tap(find.text('X'));
    await tester.pump();
    await tester.pump(const Duration(seconds: 1));

    expect(find.text('Sample Form'), findsOneWidget);
    expect(route.hasCallback, isTrue);

    // Rebuild the route's SampleForm child an additional 3x for good measure.
    contentsSetState(() { });
    await tester.pump();
    contentsSetState(() { });
    await tester.pump();
    contentsSetState(() { });
    await tester.pump();

    // Now build the route's contents without the sample form.
    contentsEmpty = true;
    contentsSetState(() { });
    await tester.pump();

    expect(route.hasCallback, isFalse);
  });
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}