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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.

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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/gestures.dart';
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void main() {
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  testWidgets('Drag and drop - control test', (WidgetTester tester) async {
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    final List<int> accepted = <int>[];
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    int dragStartedCount = 0;
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    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
          new Draggable<int>(
            data: 1,
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            child: const Text('Source'),
            feedback: const Text('Dragging'),
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            onDragStarted: () {
              ++dragStartedCount;
            },
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          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return new Container(height: 100.0, child: const Text('Target'));
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            },
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            onAccept: accepted.add,
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          ),
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        ],
      ),
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    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
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    expect(dragStartedCount, 0);
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    final Offset firstLocation = tester.getCenter(find.text('Source'));
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    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
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    await tester.pump();
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    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
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    expect(dragStartedCount, 1);
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    final Offset secondLocation = tester.getCenter(find.text('Target'));
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    await gesture.moveTo(secondLocation);
    await tester.pump();
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    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
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    expect(dragStartedCount, 1);
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    await gesture.up();
    await tester.pump();
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    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
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    expect(dragStartedCount, 1);
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  });
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  testWidgets('Drag and drop - onLeave callback fires correctly', (WidgetTester tester) async {
    final Map<String,int> leftBehind = <String,int>{
      'Target 1': 0,
      'Target 2': 0,
    };

    await tester.pumpWidget(new MaterialApp(
      home: new Column(
        children: <Widget>[
          const Draggable<int>(
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return new Container(height: 100.0, child: const Text('Target 1'));
            },
            onLeave: (int data) => leftBehind['Target 1'] = leftBehind['Target 1'] + data,
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return new Container(height: 100.0, child: const Text('Target 2'));
            },
            onLeave: (int data) => leftBehind['Target 2'] = leftBehind['Target 2'] + data,
          ),
        ],
      ),
    ));

    expect(leftBehind['Target 1'], equals(0));
    expect(leftBehind['Target 2'], equals(0));

    final Offset firstLocation = tester.getCenter(find.text('Source'));
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();

    expect(leftBehind['Target 1'], equals(0));
    expect(leftBehind['Target 2'], equals(0));

    final Offset secondLocation = tester.getCenter(find.text('Target 1'));
    await gesture.moveTo(secondLocation);
    await tester.pump();

    expect(leftBehind['Target 1'], equals(0));
    expect(leftBehind['Target 2'], equals(0));

    final Offset thirdLocation = tester.getCenter(find.text('Target 2'));
    await gesture.moveTo(thirdLocation);
    await tester.pump();

    expect(leftBehind['Target 1'], equals(1));
    expect(leftBehind['Target 2'], equals(0));

    await gesture.moveTo(secondLocation);
    await tester.pump();

    expect(leftBehind['Target 1'], equals(1));
    expect(leftBehind['Target 2'], equals(1));

    await gesture.up();
    await tester.pump();

    expect(leftBehind['Target 1'], equals(1));
    expect(leftBehind['Target 2'], equals(1));
    });

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  testWidgets('Drag and drop - dragging over button', (WidgetTester tester) async {
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    final List<String> events = <String>[];
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    Offset firstLocation, secondLocation;
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    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
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          const Draggable<int>(
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            data: 1,
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            child: const Text('Source'),
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            feedback: const Text('Dragging'),
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          ),
          new Stack(
            children: <Widget>[
              new GestureDetector(
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                behavior: HitTestBehavior.opaque,
                onTap: () {
                  events.add('tap');
                },
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                child: new Container(child: const Text('Button'),
              ),
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            ),
            new DragTarget<int>(
              builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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                return new IgnorePointer(
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                  child: new Container(child: const Text('Target')),
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                );
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              },
              onAccept: (int data) {
                events.add('drop');
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              }),
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            ],
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          ),
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        ],
      ),
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    ));

    expect(events, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Button'), findsOneWidget);

    // taps (we check both to make sure the test is consistent)

    expect(events, isEmpty);
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    await tester.tap(find.text('Button'));
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    expect(events, equals(<String>['tap']));
    events.clear();

    expect(events, isEmpty);
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    await tester.tap(find.text('Target'));
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    expect(events, equals(<String>['tap']));
    events.clear();

    // drag and drop

    firstLocation = tester.getCenter(find.text('Source'));
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    TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
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    secondLocation = tester.getCenter(find.text('Target'));
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    await gesture.moveTo(secondLocation);
    await tester.pump();
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    expect(events, isEmpty);
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    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop']));
    events.clear();

    // drag and tap and drop

    firstLocation = tester.getCenter(find.text('Source'));
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    gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
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    secondLocation = tester.getCenter(find.text('Target'));
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    await gesture.moveTo(secondLocation);
    await tester.pump();
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    expect(events, isEmpty);
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    await tester.tap(find.text('Button'));
    await tester.tap(find.text('Target'));
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['tap', 'tap', 'drop']));
    events.clear();
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  });

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  testWidgets('Drag and drop - tapping button', (WidgetTester tester) async {
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    final List<String> events = <String>[];
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    Offset firstLocation, secondLocation;
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    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
          new Draggable<int>(
            data: 1,
            child: new GestureDetector(
              behavior: HitTestBehavior.opaque,
              onTap: () {
                events.add('tap');
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              },
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              child: new Container(child: const Text('Button')),
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            ),
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            feedback: const Text('Dragging'),
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          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return const Text('Target');
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            },
            onAccept: (int data) {
              events.add('drop');
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            },
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          ),
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        ],
      ),
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    ));

    expect(events, isEmpty);
    expect(find.text('Button'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

    expect(events, isEmpty);
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    await tester.tap(find.text('Button'));
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    expect(events, equals(<String>['tap']));
    events.clear();

    firstLocation = tester.getCenter(find.text('Button'));
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    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
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    await tester.pump();
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    secondLocation = tester.getCenter(find.text('Target'));
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    await gesture.moveTo(secondLocation);
    await tester.pump();
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    expect(events, isEmpty);
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    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop']));
    events.clear();
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  });

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  testWidgets('Drag and drop - long press draggable, short press', (WidgetTester tester) async {
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    final List<String> events = <String>[];
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    Offset firstLocation, secondLocation;
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    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
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          const LongPressDraggable<int>(
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            data: 1,
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            child: const Text('Source'),
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            feedback: const Text('Dragging'),
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          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return const Text('Target');
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            },
            onAccept: (int data) {
              events.add('drop');
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            },
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          ),
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        ],
      ),
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    ));

    expect(events, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

    expect(events, isEmpty);
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    await tester.tap(find.text('Source'));
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    expect(events, isEmpty);

    firstLocation = tester.getCenter(find.text('Source'));
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    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
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    await tester.pump();
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    secondLocation = tester.getCenter(find.text('Target'));
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    await gesture.moveTo(secondLocation);
    await tester.pump();
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    expect(events, isEmpty);
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    await gesture.up();
    await tester.pump();
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    expect(events, isEmpty);
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  });

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  testWidgets('Drag and drop - long press draggable, long press', (WidgetTester tester) async {
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    final List<String> events = <String>[];
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    Offset firstLocation, secondLocation;
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    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
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          const Draggable<int>(
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            data: 1,
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            child: const Text('Source'),
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            feedback: const Text('Dragging'),
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          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return const Text('Target');
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            },
            onAccept: (int data) {
              events.add('drop');
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            },
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          ),
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        ],
      ),
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    ));
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    expect(events, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
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    expect(events, isEmpty);
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    await tester.tap(find.text('Source'));
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    expect(events, isEmpty);
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    firstLocation = tester.getCenter(find.text('Source'));
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    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
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    await tester.pump();
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    await tester.pump(const Duration(seconds: 20));
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    secondLocation = tester.getCenter(find.text('Target'));
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    await gesture.moveTo(secondLocation);
    await tester.pump();
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    expect(events, isEmpty);
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    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop']));
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  });

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  testWidgets('Drag and drop - horizontal and vertical draggables in vertical block', (WidgetTester tester) async {
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    final List<String> events = <String>[];
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    Offset firstLocation, secondLocation, thirdLocation;
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    await tester.pumpWidget(new MaterialApp(
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      home: new ListView(
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        children: <Widget>[
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return const Text('Target');
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            },
            onAccept: (int data) {
              events.add('drop $data');
            }
          ),
          new Container(height: 400.0),
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          const Draggable<int>(
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            data: 1,
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            child: const Text('H'),
            feedback: const Text('Dragging'),
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            affinity: Axis.horizontal,
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          ),
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          const Draggable<int>(
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            data: 2,
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            child: const Text('V'),
            feedback: const Text('Dragging'),
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            affinity: Axis.vertical,
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          ),
          new Container(height: 500.0),
          new Container(height: 500.0),
          new Container(height: 500.0),
          new Container(height: 500.0),
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        ],
      ),
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    ));

    expect(events, isEmpty);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('H'), findsOneWidget);
    expect(find.text('V'), findsOneWidget);

    // vertical draggable drags vertically
    expect(events, isEmpty);
    firstLocation = tester.getCenter(find.text('V'));
    secondLocation = tester.getCenter(find.text('Target'));
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    TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump();
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop 2']));
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    expect(tester.getCenter(find.text('Target')).dy, greaterThan(0.0));
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    events.clear();

    // horizontal draggable drags horizontally
    expect(events, isEmpty);
    firstLocation = tester.getTopLeft(find.text('H'));
    secondLocation = tester.getTopRight(find.text('H'));
    thirdLocation = tester.getCenter(find.text('Target'));
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    gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump();
    await gesture.moveTo(thirdLocation);
    await tester.pump();
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop 1']));
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    expect(tester.getCenter(find.text('Target')).dy, greaterThan(0.0));
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    events.clear();

    // vertical draggable drags horizontally when there's no competition
    // from other gesture detectors
    expect(events, isEmpty);
    firstLocation = tester.getTopLeft(find.text('V'));
    secondLocation = tester.getTopRight(find.text('V'));
    thirdLocation = tester.getCenter(find.text('Target'));
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    gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump();
    await gesture.moveTo(thirdLocation);
    await tester.pump();
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop 2']));
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    expect(tester.getCenter(find.text('Target')).dy, greaterThan(0.0));
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    events.clear();

    // horizontal draggable doesn't drag vertically when there is competition
    // for vertical gestures
    expect(events, isEmpty);
    firstLocation = tester.getCenter(find.text('H'));
    secondLocation = tester.getCenter(find.text('Target'));
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    gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump(); // scrolls off screen!
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>[]));
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    expect(find.text('Target'), findsNothing);
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    events.clear();
  });
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  testWidgets('Drag and drop - horizontal and vertical draggables in horizontal block', (WidgetTester tester) async {
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    final List<String> events = <String>[];
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    Offset firstLocation, secondLocation, thirdLocation;
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    await tester.pumpWidget(new MaterialApp(
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      home: new ListView(
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        scrollDirection: Axis.horizontal,
        children: <Widget>[
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return const Text('Target');
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            },
            onAccept: (int data) {
              events.add('drop $data');
            }
          ),
          new Container(width: 400.0),
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          const Draggable<int>(
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            data: 1,
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            child: const Text('H'),
            feedback: const Text('Dragging'),
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            affinity: Axis.horizontal,
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          ),
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          const Draggable<int>(
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            data: 2,
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            child: const Text('V'),
            feedback: const Text('Dragging'),
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            affinity: Axis.vertical,
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          ),
          new Container(width: 500.0),
          new Container(width: 500.0),
          new Container(width: 500.0),
          new Container(width: 500.0),
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        ],
      ),
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    ));

    expect(events, isEmpty);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('H'), findsOneWidget);
    expect(find.text('V'), findsOneWidget);

    // horizontal draggable drags horizontally
    expect(events, isEmpty);
    firstLocation = tester.getCenter(find.text('H'));
    secondLocation = tester.getCenter(find.text('Target'));
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    TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump();
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop 1']));
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    expect(tester.getCenter(find.text('Target')).dx, greaterThan(0.0));
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    events.clear();

    // vertical draggable drags vertically
    expect(events, isEmpty);
    firstLocation = tester.getTopLeft(find.text('V'));
    secondLocation = tester.getBottomLeft(find.text('V'));
    thirdLocation = tester.getCenter(find.text('Target'));
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    gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump();
    await gesture.moveTo(thirdLocation);
    await tester.pump();
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop 2']));
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    expect(tester.getCenter(find.text('Target')).dx, greaterThan(0.0));
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    events.clear();

    // horizontal draggable drags vertically when there's no competition
    // from other gesture detectors
    expect(events, isEmpty);
    firstLocation = tester.getTopLeft(find.text('H'));
    secondLocation = tester.getBottomLeft(find.text('H'));
    thirdLocation = tester.getCenter(find.text('Target'));
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    gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump();
    await gesture.moveTo(thirdLocation);
    await tester.pump();
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['drop 1']));
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    expect(tester.getCenter(find.text('Target')).dx, greaterThan(0.0));
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    events.clear();

    // vertical draggable doesn't drag horizontally when there is competition
    // for horizontal gestures
    expect(events, isEmpty);
    firstLocation = tester.getCenter(find.text('V'));
    secondLocation = tester.getCenter(find.text('Target'));
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    gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump(); // scrolls off screen!
    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>[]));
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    expect(find.text('Target'), findsNothing);
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    events.clear();
  });
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  testWidgets('Drag and drop - onDraggableCanceled not called if dropped on accepting target', (WidgetTester tester) async {
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    final List<int> accepted = <int>[];
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    bool onDraggableCanceledCalled = false;
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    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
          new Draggable<int>(
            data: 1,
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            child: const Text('Source'),
            feedback: const Text('Dragging'),
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            onDraggableCanceled: (Velocity velocity, Offset offset) {
              onDraggableCanceledCalled = true;
            }
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return new Container(height: 100.0, child: const Text('Target'));
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            },
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            onAccept: accepted.add,
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          ),
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        ],
      ),
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    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

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    final Offset firstLocation = tester.getCenter(find.text('Source'));
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    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
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    await tester.pump();
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    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

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    final Offset secondLocation = tester.getCenter(find.text('Target'));
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    await gesture.moveTo(secondLocation);
    await tester.pump();
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    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

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    await gesture.up();
    await tester.pump();
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    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);
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  });

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  testWidgets('Drag and drop - onDraggableCanceled called if dropped on non-accepting target', (WidgetTester tester) async {
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    final List<int> accepted = <int>[];
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    bool onDraggableCanceledCalled = false;
    Velocity onDraggableCanceledVelocity;
    Offset onDraggableCanceledOffset;

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    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
659 660
          new Draggable<int>(
            data: 1,
661 662
            child: const Text('Source'),
            feedback: const Text('Dragging'),
663 664 665 666
            onDraggableCanceled: (Velocity velocity, Offset offset) {
              onDraggableCanceledCalled = true;
              onDraggableCanceledVelocity = velocity;
              onDraggableCanceledOffset = offset;
667
            },
668 669 670 671 672
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return new Container(
                height: 100.0,
673
                child: const Text('Target')
674 675
              );
            },
676
            onWillAccept: (int data) => false,
677
          ),
678 679
        ],
      ),
680 681 682 683 684 685 686 687
    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

688
    final Offset firstLocation = tester.getTopLeft(find.text('Source'));
689
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
690
    await tester.pump();
691 692 693 694 695 696 697

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

698
    final Offset secondLocation = tester.getCenter(find.text('Target'));
699 700
    await gesture.moveTo(secondLocation);
    await tester.pump();
701 702 703 704 705 706 707

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

708 709
    await gesture.up();
    await tester.pump();
710 711 712 713 714 715 716

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isTrue);
    expect(onDraggableCanceledVelocity, equals(Velocity.zero));
717
    expect(onDraggableCanceledOffset, equals(new Offset(secondLocation.dx, secondLocation.dy)));
718
  });
719

720
  testWidgets('Drag and drop - onDraggableCanceled called if dropped on non-accepting target with correct velocity', (WidgetTester tester) async {
721
    final List<int> accepted = <int>[];
722 723 724 725
    bool onDraggableCanceledCalled = false;
    Velocity onDraggableCanceledVelocity;
    Offset onDraggableCanceledOffset;

726
    await tester.pumpWidget(new MaterialApp(
727 728 729
      home: new Column(children: <Widget>[
        new Draggable<int>(
          data: 1,
730 731
          child: const Text('Source'),
          feedback: const Text('Source'),
732 733 734 735
          onDraggableCanceled: (Velocity velocity, Offset offset) {
            onDraggableCanceledCalled = true;
            onDraggableCanceledVelocity = velocity;
            onDraggableCanceledOffset = offset;
736
          },
737 738 739 740 741
        ),
        new DragTarget<int>(
          builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
            return new Container(
              height: 100.0,
742
              child: const Text('Target'),
743 744 745
            );
          },
          onWillAccept: (int data) => false),
746 747
        ],
      ),
748 749 750 751 752 753 754 755
    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

756
    final Offset flingStart = tester.getTopLeft(find.text('Source'));
757
    await tester.flingFrom(flingStart, const Offset(0.0, 100.0), 1000.0);
758
    await tester.pump();
759 760 761 762 763 764 765 766

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isTrue);
    expect(onDraggableCanceledVelocity.pixelsPerSecond.dx.abs(), lessThan(0.0000001));
    expect((onDraggableCanceledVelocity.pixelsPerSecond.dy - 1000.0).abs(), lessThan(0.0000001));
767
    expect(onDraggableCanceledOffset, equals(new Offset(flingStart.dx, flingStart.dy) + const Offset(0.0, 100.0)));
768
  });
769

770 771 772 773 774 775 776 777 778 779 780 781 782
  testWidgets('Drag and drop - onDragCompleted not called if dropped on non-accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragCompletedCalled = false;

    await tester.pumpWidget(new MaterialApp(
      home: new Column(
        children: <Widget>[
          new Draggable<int>(
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
783
            },
784 785 786 787 788
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return new Container(
                height: 100.0,
789
                child: const Text('Target'),
790 791
              );
            },
792
            onWillAccept: (int data) => false,
793
          ),
794 795
        ],
      ),
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    final Offset firstLocation = tester.getTopLeft(find.text('Source'));
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    final Offset secondLocation = tester.getCenter(find.text('Target'));
    await gesture.moveTo(secondLocation);
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    await gesture.up();
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);
  });

  testWidgets('Drag and drop - onDragCompleted called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragCompletedCalled = false;

    await tester.pumpWidget(new MaterialApp(
      home: new Column(
        children: <Widget>[
          new Draggable<int>(
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
847
            },
848 849 850 851 852
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return new Container(height: 100.0, child: const Text('Target'));
            },
853
            onAccept: accepted.add,
854
          ),
855 856
        ],
      ),
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894
    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    final Offset firstLocation = tester.getCenter(find.text('Source'));
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    final Offset secondLocation = tester.getCenter(find.text('Target'));
    await gesture.moveTo(secondLocation);
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    await gesture.up();
    await tester.pump();

    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isTrue);
  });

895
  testWidgets('Drag and drop - allow pass thru of unaccepted data test', (WidgetTester tester) async {
896 897
    final List<int> acceptedInts = <int>[];
    final List<double> acceptedDoubles = <double>[];
898

899
    await tester.pumpWidget(new MaterialApp(
900 901
      home: new Column(
        children: <Widget>[
902
          const Draggable<int>(
903
            data: 1,
904
            child: const Text('IntSource'),
905
            feedback: const Text('IntDragging'),
906
          ),
907
          const Draggable<double>(
908
            data: 1.0,
909
            child: const Text('DoubleSource'),
910
            feedback: const Text('DoubleDragging'),
911 912 913 914 915 916 917 918
          ),
          new Stack(
            children: <Widget>[
              new DragTarget<int>(
                builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
                  return new IgnorePointer(
                    child: new Container(
                      height: 100.0,
919 920
                      child: const Text('Target1'),
                    ),
921 922
                  );
                },
923
                onAccept: acceptedInts.add,
924 925 926 927 928 929
              ),
              new DragTarget<double>(
                builder: (BuildContext context, List<double> data, List<dynamic> rejects) {
                  return new IgnorePointer(
                    child: new Container(
                      height: 100.0,
930 931
                      child: const Text('Target2'),
                    ),
932 933
                  );
                },
934
                onAccept: acceptedDoubles.add,
935
              ),
936 937 938 939
            ],
          ),
        ],
      ),
940 941 942 943 944 945 946 947 948 949 950
    ));

    expect(acceptedInts, isEmpty);
    expect(acceptedDoubles, isEmpty);
    expect(find.text('IntSource'), findsOneWidget);
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleSource'), findsOneWidget);
    expect(find.text('DoubleDragging'), findsNothing);
    expect(find.text('Target1'), findsOneWidget);
    expect(find.text('Target2'), findsOneWidget);

951 952 953
    final Offset intLocation = tester.getCenter(find.text('IntSource'));
    final Offset doubleLocation = tester.getCenter(find.text('DoubleSource'));
    final Offset targetLocation = tester.getCenter(find.text('Target1'));
954 955

    // Drag the double draggable.
956
    final TestGesture doubleGesture = await tester.startGesture(doubleLocation, pointer: 7);
957
    await tester.pump();
958 959 960 961 962 963

    expect(acceptedInts, isEmpty);
    expect(acceptedDoubles, isEmpty);
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsOneWidget);

964 965
    await doubleGesture.moveTo(targetLocation);
    await tester.pump();
966 967 968 969 970 971

    expect(acceptedInts, isEmpty);
    expect(acceptedDoubles, isEmpty);
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsOneWidget);

972 973
    await doubleGesture.up();
    await tester.pump();
974 975 976 977 978 979 980 981 982

    expect(acceptedInts, isEmpty);
    expect(acceptedDoubles, equals(<double>[1.0]));
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsNothing);

    acceptedDoubles.clear();

    // Drag the int draggable.
983
    final TestGesture intGesture = await tester.startGesture(intLocation, pointer: 7);
984
    await tester.pump();
985 986 987 988 989 990

    expect(acceptedInts, isEmpty);
    expect(acceptedDoubles, isEmpty);
    expect(find.text('IntDragging'), findsOneWidget);
    expect(find.text('DoubleDragging'), findsNothing);

991 992
    await intGesture.moveTo(targetLocation);
    await tester.pump();
993 994 995 996 997 998

    expect(acceptedInts, isEmpty);
    expect(acceptedDoubles, isEmpty);
    expect(find.text('IntDragging'), findsOneWidget);
    expect(find.text('DoubleDragging'), findsNothing);

999 1000
    await intGesture.up();
    await tester.pump();
1001 1002 1003 1004 1005 1006

    expect(acceptedInts, equals(<int>[1]));
    expect(acceptedDoubles, isEmpty);
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsNothing);
  });
1007

1008
  testWidgets('Drag and drop - allow pass thru of unaccepted data twice test', (WidgetTester tester) async {
1009 1010 1011
    final List<DragTargetData> acceptedDragTargetDatas = <DragTargetData>[];
    final List<ExtendedDragTargetData> acceptedExtendedDragTargetDatas = <ExtendedDragTargetData>[];
    final DragTargetData dragTargetData = new DragTargetData();
1012
    await tester.pumpWidget(new MaterialApp(
1013 1014 1015 1016
      home: new Column(
        children: <Widget>[
          new Draggable<DragTargetData>(
            data: dragTargetData,
1017
            child: const Text('Source'),
1018
            feedback: const Text('Dragging'),
1019 1020 1021 1022 1023 1024 1025 1026
          ),
          new Stack(
            children: <Widget>[
              new DragTarget<DragTargetData>(
                builder: (BuildContext context, List<DragTargetData> data, List<dynamic> rejects) {
                  return new IgnorePointer(
                    child: new Container(
                      height: 100.0,
1027 1028
                      child: const Text('Target1'),
                    ),
1029
                  );
1030
                }, onAccept: acceptedDragTargetDatas.add,
1031 1032
              ),
              new DragTarget<ExtendedDragTargetData>(
1033
                builder: (BuildContext context, List<ExtendedDragTargetData> data, List<dynamic> rejects) {
1034 1035 1036
                  return new IgnorePointer(
                    child: new Container(
                      height: 100.0,
1037 1038
                      child: const Text('Target2'),
                    ),
1039 1040
                  );
                },
1041
                onAccept: acceptedExtendedDragTargetDatas.add,
1042
              ),
1043 1044 1045 1046
            ],
          ),
        ],
      ),
1047
    ));
1048

1049 1050
    final Offset dragTargetLocation = tester.getCenter(find.text('Source'));
    final Offset targetLocation = tester.getCenter(find.text('Target1'));
1051

1052
    for (int i = 0; i < 2; i += 1) {
1053
      final TestGesture gesture = await tester.startGesture(dragTargetLocation);
1054 1055 1056 1057 1058
      await tester.pump();
      await gesture.moveTo(targetLocation);
      await tester.pump();
      await gesture.up();
      await tester.pump();
1059

1060 1061
      expect(acceptedDragTargetDatas, equals(<DragTargetData>[dragTargetData]));
      expect(acceptedExtendedDragTargetDatas, isEmpty);
1062

1063
      acceptedDragTargetDatas.clear();
1064
      await tester.pump();
1065
    }
1066
  });
1067

1068
  testWidgets('Drag and drop - maxSimultaneousDrags', (WidgetTester tester) async {
1069
    final List<int> accepted = <int>[];
1070 1071 1072 1073 1074 1075 1076 1077

    Widget build(int maxSimultaneousDrags) {
      return new MaterialApp(
        home: new Column(
          children: <Widget>[
            new Draggable<int>(
              data: 1,
              maxSimultaneousDrags: maxSimultaneousDrags,
1078
              child: const Text('Source'),
1079
              feedback: const Text('Dragging'),
1080 1081 1082
            ),
            new DragTarget<int>(
              builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1083
                return new Container(height: 100.0, child: const Text('Target'));
1084
              },
1085
              onAccept: accepted.add,
1086
            ),
1087 1088
          ],
        ),
1089 1090 1091 1092 1093
      );
    }

    await tester.pumpWidget(build(0));

1094 1095
    final Offset firstLocation = tester.getCenter(find.text('Source'));
    final Offset secondLocation = tester.getCenter(find.text('Target'));
1096 1097 1098 1099 1100 1101

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);

1102
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);

    await gesture.up();

    await tester.pumpWidget(build(2));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);

1119
    final TestGesture gesture1 = await tester.startGesture(firstLocation, pointer: 8);
1120 1121 1122 1123 1124 1125 1126
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

1127
    final TestGesture gesture2 = await tester.startGesture(firstLocation, pointer: 9);
1128 1129 1130 1131 1132 1133 1134
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNWidgets(2));
    expect(find.text('Target'), findsOneWidget);

1135
    final TestGesture gesture3 = await tester.startGesture(firstLocation, pointer: 10);
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNWidgets(2));
    expect(find.text('Target'), findsOneWidget);

    await gesture1.moveTo(secondLocation);
    await gesture2.moveTo(secondLocation);
    await gesture3.moveTo(secondLocation);
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNWidgets(2));
    expect(find.text('Target'), findsOneWidget);

    await gesture1.up();
    await tester.pump();

    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

    await gesture2.up();
    await tester.pump();

    expect(accepted, equals(<int>[1, 1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);

    await gesture3.up();
    await tester.pump();

    expect(accepted, equals(<int>[1, 1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
  });

1178 1179
  testWidgets('Draggable disposes recognizer', (WidgetTester tester) async {
    bool didTap = false;
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
    await tester.pumpWidget(
      new Directionality(
        textDirection: TextDirection.ltr,
        child: new Overlay(
          initialEntries: <OverlayEntry>[
            new OverlayEntry(
              builder: (BuildContext context) => new GestureDetector(
                onTap: () {
                  didTap = true;
                },
                child: new Draggable<dynamic>(
                  child: new Container(
                    color: const Color(0xFFFFFF00),
                  ),
                  feedback: new Container(
                    width: 100.0,
                    height: 100.0,
                    color: const Color(0xFFFF0000),
                  ),
                ),
1200
              ),
1201 1202 1203 1204 1205
            ),
          ],
        ),
      ),
    );
1206

1207
    await tester.startGesture(const Offset(10.0, 10.0));
1208 1209 1210 1211 1212 1213 1214 1215
    expect(didTap, isFalse);

    // This tears down the draggable without terminating the gesture sequence,
    // which used to trigger asserts in the multi-drag gesture recognizer.
    await tester.pumpWidget(new Container(key: new UniqueKey()));
    expect(didTap, isFalse);
  });

1216
  // Regression test for https://github.com/flutter/flutter/issues/6128.
1217
  testWidgets('Draggable plays nice with onTap', (WidgetTester tester) async {
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
    await tester.pumpWidget(
      new Directionality(
        textDirection: TextDirection.ltr,
        child: new Overlay(
          initialEntries: <OverlayEntry>[
            new OverlayEntry(
              builder: (BuildContext context) => new GestureDetector(
                onTap: () { /* registers a tap recognizer */ },
                child: new Draggable<dynamic>(
                  child: new Container(
                    color: const Color(0xFFFFFF00),
                  ),
                  feedback: new Container(
                    width: 100.0,
                    height: 100.0,
                    color: const Color(0xFFFF0000),
                  ),
                ),
1236
              ),
1237 1238 1239 1240 1241
            ),
          ],
        ),
      ),
    );
1242

1243 1244
    final TestGesture firstGesture = await tester.startGesture(const Offset(10.0, 10.0), pointer: 24);
    final TestGesture secondGesture = await tester.startGesture(const Offset(10.0, 20.0), pointer: 25);
1245

1246
    await firstGesture.moveBy(const Offset(100.0, 0.0));
1247 1248
    await secondGesture.up();
  });
1249 1250

  testWidgets('DragTarget does not set state when remove from the tree', (WidgetTester tester) async {
1251
    final List<String> events = <String>[];
1252
    Offset firstLocation, secondLocation;
1253 1254 1255 1256

    await tester.pumpWidget(new MaterialApp(
      home: new Column(
        children: <Widget>[
1257
          const Draggable<int>(
1258
            data: 1,
1259 1260
            child: const Text('Source'),
            feedback: const Text('Dragging')
1261 1262 1263
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1264
              return const Text('Target');
1265 1266 1267
            },
            onAccept: (int data) {
              events.add('drop');
1268
            },
1269
          ),
1270 1271
        ],
      ),
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
    ));

    expect(events, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

    expect(events, isEmpty);
    await tester.tap(find.text('Source'));
    expect(events, isEmpty);

    firstLocation = tester.getCenter(find.text('Source'));
1283
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
    await tester.pump();

    await tester.pump(const Duration(seconds: 20));

    secondLocation = tester.getCenter(find.text('Target'));
    await gesture.moveTo(secondLocation);
    await tester.pump();

    await tester.pumpWidget(new MaterialApp(
      home: new Column(
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        children: const <Widget>[
1295
          const Draggable<int>(
1296
            data: 1,
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            child: const Text('Source'),
            feedback: const Text('Dragging')
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          ),
        ]
      )
    ));

    expect(events, isEmpty);
    await gesture.up();
    await tester.pump();
  });
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  testWidgets('Drag and drop - remove draggable', (WidgetTester tester) async {
1310
    final List<int> accepted = <int>[];
1311 1312

    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
          const Draggable<int>(
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging')
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return new Container(height: 100.0, child: const Text('Target'));
            },
            onAccept: accepted.add,
          ),
        ],
      ),
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    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);

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    final Offset firstLocation = tester.getCenter(find.text('Source'));
1336
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
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    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

    await tester.pumpWidget(new MaterialApp(
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      home: new Column(
        children: <Widget>[
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return new Container(height: 100.0, child: const Text('Target'));
            },
            onAccept: accepted.add,
          ),
        ],
      ),
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    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsNothing);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

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    final Offset secondLocation = tester.getCenter(find.text('Target'));
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    await gesture.moveTo(secondLocation);
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsNothing);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

    await gesture.up();
    await tester.pump();

    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsNothing);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
  });

1380
  testWidgets('Tap above long-press draggable works', (WidgetTester tester) async {
1381
    final List<String> events = <String>[];
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    await tester.pumpWidget(new MaterialApp(
      home: new Material(
        child: new Center(
          child: new GestureDetector(
            onTap: () {
              events.add('tap');
            },
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            child: const LongPressDraggable<int>(
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              feedback: const Text('Feedback'),
              child: const Text('X'),
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            ),
          ),
        ),
      ),
    ));

    expect(events, isEmpty);
    await tester.tap(find.text('X'));
    expect(events, equals(<String>['tap']));
  });
1403

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  testWidgets('long-press draggable calls onDragCompleted called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragCompletedCalled = false;

    await tester.pumpWidget(new MaterialApp(
      home: new Column(
        children: <Widget>[
          new LongPressDraggable<int>(
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
            },
          ),
          new DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return new Container(height: 100.0, child: const Text('Target'));
            },
            onAccept: accepted.add,
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    final Offset firstLocation = tester.getCenter(find.text('Source'));
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    await tester.pump(kLongPressTimeout);

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);


    final Offset secondLocation = tester.getCenter(find.text('Target'));
    await gesture.moveTo(secondLocation);
    await tester.pump();

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);

    await gesture.up();
    await tester.pump();

    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isTrue);
  });

  testWidgets('long-press draggable calls onDragStartedCalled after long press', (WidgetTester tester) async {
    bool onDragStartedCalled = false;

    await tester.pumpWidget(new MaterialApp(
      home: new LongPressDraggable<int>(
        data: 1,
        child: const Text('Source'),
        feedback: const Text('Dragging'),
        onDragStarted: () {
          onDragStartedCalled = true;
        },
      ),
    ));

    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(onDragStartedCalled, isFalse);

    final Offset firstLocation = tester.getCenter(find.text('Source'));
    await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();

    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(onDragStartedCalled, isFalse);

    await tester.pump(kLongPressTimeout);

    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(onDragStartedCalled, isTrue);
  });

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  testWidgets('Drag feedback with child anchor positions correctly', (WidgetTester tester) async {
    await _testChildAnchorFeedbackPosition(tester: tester);
  });

  testWidgets('Drag feedback with child anchor within a non-global Overlay positions correctly', (WidgetTester tester) async {
    await _testChildAnchorFeedbackPosition(tester: tester, left: 100.0, top: 100.0);
  });
}

Future<Null> _testChildAnchorFeedbackPosition({WidgetTester tester, double top: 0.0, double left: 0.0}) async {
1517
  final List<int> accepted = <int>[];
1518 1519
  int dragStartedCount = 0;

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  await tester.pumpWidget(
    new Stack(
      textDirection: TextDirection.ltr,
      children: <Widget>[
        new Positioned(
          left: left,
          top: top,
          right: 0.0,
          bottom: 0.0,
          child: new MaterialApp(
            home: new Column(
              children: <Widget>[
                new Draggable<int>(
                  data: 1,
                  child: const Text('Source'),
                  feedback: const Text('Dragging'),
                  onDragStarted: () {
                    ++dragStartedCount;
                  },
                ),
                new DragTarget<int>(
                  builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
                    return new Container(height: 100.0, child: const Text('Target'));
                  },
                  onAccept: accepted.add,
                ),
              ],
1547
            ),
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          ),
        ),
      ],
    ),
  );
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  expect(accepted, isEmpty);
  expect(find.text('Source'), findsOneWidget);
  expect(find.text('Dragging'), findsNothing);
  expect(find.text('Target'), findsOneWidget);
  expect(dragStartedCount, 0);

1560
  final Offset firstLocation = tester.getCenter(find.text('Source'));
1561
  final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
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  await tester.pump();

  expect(accepted, isEmpty);
  expect(find.text('Source'), findsOneWidget);
  expect(find.text('Dragging'), findsOneWidget);
  expect(find.text('Target'), findsOneWidget);
  expect(dragStartedCount, 1);


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  final Offset secondLocation = tester.getBottomRight(find.text('Target'));
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  await gesture.moveTo(secondLocation);
  await tester.pump();

  expect(accepted, isEmpty);
  expect(find.text('Source'), findsOneWidget);
  expect(find.text('Dragging'), findsOneWidget);
  expect(find.text('Target'), findsOneWidget);
  expect(dragStartedCount, 1);

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  final Offset feedbackTopLeft = tester.getTopLeft(find.text('Dragging'));
  final Offset sourceTopLeft = tester.getTopLeft(find.text('Source'));
1583
  final Offset dragOffset = secondLocation - firstLocation;
1584
  expect(feedbackTopLeft, equals(sourceTopLeft + dragOffset));
1585 1586
}

1587
class DragTargetData { }
1588

1589
class ExtendedDragTargetData extends DragTargetData { }