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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/semantics.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/gestures.dart';
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import 'semantics_tester.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(MaterialApp(
      home: Column(
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        children: <Widget>[
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          Draggable<int>(
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            data: 1,
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            child: const Text('Source'),
            feedback: const Text('Dragging'),
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            onDragStarted: () {
              ++dragStartedCount;
            },
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          ),
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          DragTarget<int>(
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            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return 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,
    };

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    await tester.pumpWidget(MaterialApp(
      home: Column(
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        children: <Widget>[
          const Draggable<int>(
            data: 1,
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            child: Text('Source'),
            feedback: Text('Dragging'),
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          ),
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          DragTarget<int>(
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            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return Container(height: 100.0, child: const Text('Target 1'));
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            },
            onLeave: (int data) => leftBehind['Target 1'] = leftBehind['Target 1'] + data,
          ),
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          DragTarget<int>(
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            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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              return Container(height: 100.0, child: const Text('Target 2'));
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            },
            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(MaterialApp(
      home: Column(
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        children: <Widget>[
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          const Draggable<int>(
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            data: 1,
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            child: Text('Source'),
            feedback: Text('Dragging'),
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          ),
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          Stack(
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            children: <Widget>[
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              GestureDetector(
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                behavior: HitTestBehavior.opaque,
                onTap: () {
                  events.add('tap');
                },
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                child: Container(child: const Text('Button'),
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              ),
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            ),
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            DragTarget<int>(
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              builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
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                return IgnorePointer(
                  child: 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(MaterialApp(
      home: Column(
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        children: <Widget>[
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          Draggable<int>(
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            data: 1,
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            child: GestureDetector(
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              behavior: HitTestBehavior.opaque,
              onTap: () {
                events.add('tap');
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              },
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              child: Container(child: const Text('Button')),
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            ),
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            feedback: const Text('Dragging'),
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          ),
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          DragTarget<int>(
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            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(MaterialApp(
      home: Column(
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        children: <Widget>[
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          const LongPressDraggable<int>(
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            data: 1,
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            child: Text('Source'),
            feedback: Text('Dragging'),
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          ),
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          DragTarget<int>(
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            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(MaterialApp(
      home: Column(
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        children: <Widget>[
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          const Draggable<int>(
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            data: 1,
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            child: Text('Source'),
            feedback: Text('Dragging'),
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          ),
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          DragTarget<int>(
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            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(MaterialApp(
      home: ListView(
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        children: <Widget>[
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          DragTarget<int>(
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            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');
            }
          ),
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          Container(height: 400.0),
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          const Draggable<int>(
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            data: 1,
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            child: Text('H'),
            feedback: 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: Text('V'),
            feedback: Text('Dragging'),
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            affinity: Axis.vertical,
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          ),
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          Container(height: 500.0),
          Container(height: 500.0),
          Container(height: 500.0),
          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(MaterialApp(
      home: ListView(
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        scrollDirection: Axis.horizontal,
        children: <Widget>[
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          DragTarget<int>(
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            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');
            }
          ),
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          Container(width: 400.0),
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          const Draggable<int>(
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            data: 1,
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            child: Text('H'),
            feedback: 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: Text('V'),
            feedback: Text('Dragging'),
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            affinity: Axis.vertical,
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          ),
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          Container(width: 500.0),
          Container(width: 500.0),
          Container(width: 500.0),
          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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  group('Drag and drop - Draggables with a set axis only move along that axis', () {
    final List<String> events = <String>[];

    Widget build() {
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      return MaterialApp(
        home: ListView(
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          scrollDirection: Axis.horizontal,
          children: <Widget>[
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            DragTarget<int>(
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              builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
                return const Text('Target');
              },
              onAccept: (int data) {
                events.add('drop $data');
              }
            ),
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            Container(width: 400.0),
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            const Draggable<int>(
              data: 1,
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              child: Text('H'),
              feedback: Text('H'),
              childWhenDragging: SizedBox(),
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              axis: Axis.horizontal,
            ),
            const Draggable<int>(
              data: 2,
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              child: Text('V'),
              feedback: Text('V'),
              childWhenDragging: SizedBox(),
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              axis: Axis.vertical,
            ),
            const Draggable<int>(
              data: 3,
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              child: Text('N'),
              feedback: Text('N'),
              childWhenDragging: SizedBox(),
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            ),
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            Container(width: 500.0),
            Container(width: 500.0),
            Container(width: 500.0),
            Container(width: 500.0),
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          ],
        ),
      );
    }
    testWidgets('Null axis draggable moves along all axes', (WidgetTester tester) async {
      await tester.pumpWidget(build());
      final Offset firstLocation = tester.getTopLeft(find.text('N'));
      final Offset secondLocation = firstLocation + const Offset(300.0, 300.0);
      final Offset thirdLocation = firstLocation + const Offset(-300.0, -300.0);
      final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
      await tester.pump();
      await gesture.moveTo(secondLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('N')), secondLocation);
      await gesture.moveTo(thirdLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('N')), thirdLocation);
    });

    testWidgets('Horizontal axis draggable moves horizontally', (WidgetTester tester) async {
      await tester.pumpWidget(build());
      final Offset firstLocation = tester.getTopLeft(find.text('H'));
      final Offset secondLocation = firstLocation + const Offset(300.0, 0.0);
      final Offset thirdLocation = firstLocation + const Offset(-300.0, 0.0);
      final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
      await tester.pump();
      await gesture.moveTo(secondLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('H')), secondLocation);
      await gesture.moveTo(thirdLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('H')), thirdLocation);
    });

    testWidgets('Horizontal axis draggable does not move vertically', (WidgetTester tester) async {
      await tester.pumpWidget(build());
      final Offset firstLocation = tester.getTopLeft(find.text('H'));
      final Offset secondDragLocation = firstLocation + const Offset(300.0, 200.0);
      // The horizontal drag widget won't scroll vertically.
      final Offset secondWidgetLocation = firstLocation + const Offset(300.0, 0.0);
      final Offset thirdDragLocation = firstLocation + const Offset(-300.0, -200.0);
      final Offset thirdWidgetLocation = firstLocation + const Offset(-300.0, 0.0);
      final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
      await tester.pump();
      await gesture.moveTo(secondDragLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('H')), secondWidgetLocation);
      await gesture.moveTo(thirdDragLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('H')), thirdWidgetLocation);
    });

     testWidgets('Vertical axis draggable moves vertically', (WidgetTester tester) async {
      await tester.pumpWidget(build());
      final Offset firstLocation = tester.getTopLeft(find.text('V'));
      final Offset secondLocation = firstLocation + const Offset(0.0, 300.0);
      final Offset thirdLocation = firstLocation + const Offset(0.0, -300.0);
      final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
      await tester.pump();
      await gesture.moveTo(secondLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('V')), secondLocation);
      await gesture.moveTo(thirdLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('V')), thirdLocation);
    });

    testWidgets('Vertical axis draggable does not move horizontally', (WidgetTester tester) async {
      await tester.pumpWidget(build());
      final Offset firstLocation = tester.getTopLeft(find.text('V'));
      final Offset secondDragLocation = firstLocation + const Offset(200.0, 300.0);
      // The vertical drag widget won't scroll horizontally.
      final Offset secondWidgetLocation = firstLocation + const Offset(0.0, 300.0);
      final Offset thirdDragLocation = firstLocation + const Offset(-200.0, -300.0);
      final Offset thirdWidgetLocation = firstLocation + const Offset(0.0, -300.0);
      final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
      await tester.pump();
      await gesture.moveTo(secondDragLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('V')), secondWidgetLocation);
      await gesture.moveTo(thirdDragLocation);
      await tester.pump();
      expect(tester.getTopLeft(find.text('V')), thirdWidgetLocation);
    });
  });
719

720

721
  testWidgets('Drag and drop - onDraggableCanceled not called if dropped on accepting target', (WidgetTester tester) async {
722
    final List<int> accepted = <int>[];
723
    bool onDraggableCanceledCalled = false;
724

725 726
    await tester.pumpWidget(MaterialApp(
      home: Column(
727
        children: <Widget>[
728
          Draggable<int>(
729
            data: 1,
730 731
            child: const Text('Source'),
            feedback: const Text('Dragging'),
732 733 734 735
            onDraggableCanceled: (Velocity velocity, Offset offset) {
              onDraggableCanceledCalled = true;
            }
          ),
736
          DragTarget<int>(
737
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
738
              return Container(height: 100.0, child: const Text('Target'));
739
            },
740
            onAccept: accepted.add,
741
          ),
742 743
        ],
      ),
744 745 746 747 748 749 750 751
    ));

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

752
    final Offset firstLocation = tester.getCenter(find.text('Source'));
753
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
754
    await tester.pump();
755 756 757 758 759 760 761

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

762
    final Offset secondLocation = tester.getCenter(find.text('Target'));
763 764
    await gesture.moveTo(secondLocation);
    await tester.pump();
765 766 767 768 769 770 771

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

772 773
    await gesture.up();
    await tester.pump();
774 775 776 777 778 779

    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);
780 781
  });

782
  testWidgets('Drag and drop - onDraggableCanceled called if dropped on non-accepting target', (WidgetTester tester) async {
783
    final List<int> accepted = <int>[];
784 785 786 787
    bool onDraggableCanceledCalled = false;
    Velocity onDraggableCanceledVelocity;
    Offset onDraggableCanceledOffset;

788 789
    await tester.pumpWidget(MaterialApp(
      home: Column(
790
        children: <Widget>[
791
          Draggable<int>(
792
            data: 1,
793 794
            child: const Text('Source'),
            feedback: const Text('Dragging'),
795 796 797 798
            onDraggableCanceled: (Velocity velocity, Offset offset) {
              onDraggableCanceledCalled = true;
              onDraggableCanceledVelocity = velocity;
              onDraggableCanceledOffset = offset;
799
            },
800
          ),
801
          DragTarget<int>(
802
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
803
              return Container(
804
                height: 100.0,
805
                child: const Text('Target')
806 807
              );
            },
808
            onWillAccept: (int data) => false,
809
          ),
810 811
        ],
      ),
812 813 814 815 816 817 818 819
    ));

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

820
    final Offset firstLocation = tester.getTopLeft(find.text('Source'));
821
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
822
    await tester.pump();
823 824 825 826 827 828 829

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

830
    final Offset secondLocation = tester.getCenter(find.text('Target'));
831 832
    await gesture.moveTo(secondLocation);
    await tester.pump();
833 834 835 836 837 838 839

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

840 841
    await gesture.up();
    await tester.pump();
842 843 844 845 846 847 848

    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));
849
    expect(onDraggableCanceledOffset, equals(Offset(secondLocation.dx, secondLocation.dy)));
850
  });
851

852
  testWidgets('Drag and drop - onDraggableCanceled called if dropped on non-accepting target with correct velocity', (WidgetTester tester) async {
853
    final List<int> accepted = <int>[];
854 855 856 857
    bool onDraggableCanceledCalled = false;
    Velocity onDraggableCanceledVelocity;
    Offset onDraggableCanceledOffset;

858 859 860
    await tester.pumpWidget(MaterialApp(
      home: Column(children: <Widget>[
        Draggable<int>(
861
          data: 1,
862 863
          child: const Text('Source'),
          feedback: const Text('Source'),
864 865 866 867
          onDraggableCanceled: (Velocity velocity, Offset offset) {
            onDraggableCanceledCalled = true;
            onDraggableCanceledVelocity = velocity;
            onDraggableCanceledOffset = offset;
868
          },
869
        ),
870
        DragTarget<int>(
871
          builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
872
            return Container(
873
              height: 100.0,
874
              child: const Text('Target'),
875 876 877
            );
          },
          onWillAccept: (int data) => false),
878 879
        ],
      ),
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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);

888
    final Offset flingStart = tester.getTopLeft(find.text('Source'));
889
    await tester.flingFrom(flingStart, const Offset(0.0, 100.0), 1000.0);
890
    await tester.pump();
891 892 893 894 895 896 897 898

    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));
899
    expect(onDraggableCanceledOffset, equals(Offset(flingStart.dx, flingStart.dy) + const Offset(0.0, 100.0)));
900
  });
901

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  testWidgets('Drag and drop - onDragEnd not called if dropped on non-accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragEndCalled = false;
    DraggableDetails onDragEndDraggableDetails;
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          Draggable<int>(
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragEnd: (DraggableDetails details) {
              onDragEndCalled = true;
              onDragEndDraggableDetails = details;
            },
          ),
          DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return Container(
                height: 100.0,
                child: const Text('Target'),
              );
            },
            onWillAccept: (int data) => false,
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragEndCalled, 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(onDragEndCalled, 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(onDragEndCalled, 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(onDragEndCalled, isTrue);
    expect(onDragEndDraggableDetails, isNotNull);
    expect(onDragEndDraggableDetails.wasAccepted, isFalse);
    expect(onDragEndDraggableDetails.velocity, equals(Velocity.zero));
    expect(onDragEndDraggableDetails.offset,
        equals(
            Offset(secondLocation.dx, secondLocation.dy - firstLocation.dy)));
  });

973 974 975 976
  testWidgets('Drag and drop - onDragCompleted not called if dropped on non-accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragCompletedCalled = false;

977 978
    await tester.pumpWidget(MaterialApp(
      home: Column(
979
        children: <Widget>[
980
          Draggable<int>(
981 982 983 984 985
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
986
            },
987
          ),
988
          DragTarget<int>(
989
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
990
              return Container(
991
                height: 100.0,
992
                child: const Text('Target'),
993 994
              );
            },
995
            onWillAccept: (int data) => false,
996
          ),
997 998
        ],
      ),
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
    ));

    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);
  });

1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 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
  testWidgets('Drag and drop - onDragEnd called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragEndCalled = false;
    DraggableDetails onDragEndDraggableDetails;
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          Draggable<int>(
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragEnd: (DraggableDetails details) {
              onDragEndCalled = true;
              onDragEndDraggableDetails = details;
            },
          ),
          DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return 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(onDragEndCalled, 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(onDragEndCalled, 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(onDragEndCalled, isFalse);

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

    final Offset droppedLocation = tester.getTopLeft(find.text('Target'));
    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragEndCalled, isTrue);
    expect(onDragEndDraggableDetails, isNotNull);
    expect(onDragEndDraggableDetails.wasAccepted, isTrue);
    expect(onDragEndDraggableDetails.velocity, equals(Velocity.zero));
    expect(onDragEndDraggableDetails.offset,
        equals(
            Offset(droppedLocation.dx, secondLocation.dy - firstLocation.dy)));
  });

  testWidgets('DragTarget does not call onDragEnd when remove from the tree', (WidgetTester tester) async {
    final List<String> events = <String>[];
    Offset firstLocation, secondLocation;
    int timesOnDragEndCalled = 0;
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          Draggable<int>(
              data: 1,
              child: const Text('Source'),
              feedback: const Text('Dragging'),
              onDragEnd: (DraggableDetails details) {
                timesOnDragEndCalled++;
              },
          ),
          DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return const Text('Target');
            },
            onAccept: (int data) {
              events.add('drop');
            },
          ),
        ],
      ),
    ));

    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'));
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    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(MaterialApp(
        home: Column(
            children: const <Widget>[
              Draggable<int>(
                  data: 1,
                  child: Text('Source'),
                  feedback: Text('Dragging')
              ),
            ]
        )
    ));

    expect(events, isEmpty);
    expect(timesOnDragEndCalled, equals(1));
    await gesture.up();
    await tester.pump();
  });

1169 1170 1171 1172
  testWidgets('Drag and drop - onDragCompleted called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragCompletedCalled = false;

1173 1174
    await tester.pumpWidget(MaterialApp(
      home: Column(
1175
        children: <Widget>[
1176
          Draggable<int>(
1177 1178 1179 1180 1181
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
1182
            },
1183
          ),
1184
          DragTarget<int>(
1185
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1186
              return Container(height: 100.0, child: const Text('Target'));
1187
            },
1188
            onAccept: accepted.add,
1189
          ),
1190 1191
        ],
      ),
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
    ));

    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);
  });

1230
  testWidgets('Drag and drop - allow pass thru of unaccepted data test', (WidgetTester tester) async {
1231 1232
    final List<int> acceptedInts = <int>[];
    final List<double> acceptedDoubles = <double>[];
1233

1234 1235
    await tester.pumpWidget(MaterialApp(
      home: Column(
1236
        children: <Widget>[
1237
          const Draggable<int>(
1238
            data: 1,
1239 1240
            child: Text('IntSource'),
            feedback: Text('IntDragging'),
1241
          ),
1242
          const Draggable<double>(
1243
            data: 1.0,
1244 1245
            child: Text('DoubleSource'),
            feedback: Text('DoubleDragging'),
1246
          ),
1247
          Stack(
1248
            children: <Widget>[
1249
              DragTarget<int>(
1250
                builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1251 1252
                  return IgnorePointer(
                    child: Container(
1253
                      height: 100.0,
1254 1255
                      child: const Text('Target1'),
                    ),
1256 1257
                  );
                },
1258
                onAccept: acceptedInts.add,
1259
              ),
1260
              DragTarget<double>(
1261
                builder: (BuildContext context, List<double> data, List<dynamic> rejects) {
1262 1263
                  return IgnorePointer(
                    child: Container(
1264
                      height: 100.0,
1265 1266
                      child: const Text('Target2'),
                    ),
1267 1268
                  );
                },
1269
                onAccept: acceptedDoubles.add,
1270
              ),
1271 1272 1273 1274
            ],
          ),
        ],
      ),
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
    ));

    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);

1286 1287 1288
    final Offset intLocation = tester.getCenter(find.text('IntSource'));
    final Offset doubleLocation = tester.getCenter(find.text('DoubleSource'));
    final Offset targetLocation = tester.getCenter(find.text('Target1'));
1289 1290

    // Drag the double draggable.
1291
    final TestGesture doubleGesture = await tester.startGesture(doubleLocation, pointer: 7);
1292
    await tester.pump();
1293 1294 1295 1296 1297 1298

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

1299 1300
    await doubleGesture.moveTo(targetLocation);
    await tester.pump();
1301 1302 1303 1304 1305 1306

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

1307 1308
    await doubleGesture.up();
    await tester.pump();
1309 1310 1311 1312 1313 1314 1315 1316 1317

    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.
1318
    final TestGesture intGesture = await tester.startGesture(intLocation, pointer: 7);
1319
    await tester.pump();
1320 1321 1322 1323 1324 1325

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

1326 1327
    await intGesture.moveTo(targetLocation);
    await tester.pump();
1328 1329 1330 1331 1332 1333

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

1334 1335
    await intGesture.up();
    await tester.pump();
1336 1337 1338 1339 1340 1341

    expect(acceptedInts, equals(<int>[1]));
    expect(acceptedDoubles, isEmpty);
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsNothing);
  });
1342

1343
  testWidgets('Drag and drop - allow pass thru of unaccepted data twice test', (WidgetTester tester) async {
1344 1345
    final List<DragTargetData> acceptedDragTargetDatas = <DragTargetData>[];
    final List<ExtendedDragTargetData> acceptedExtendedDragTargetDatas = <ExtendedDragTargetData>[];
1346 1347 1348
    final DragTargetData dragTargetData = DragTargetData();
    await tester.pumpWidget(MaterialApp(
      home: Column(
1349
        children: <Widget>[
1350
          Draggable<DragTargetData>(
1351
            data: dragTargetData,
1352
            child: const Text('Source'),
1353
            feedback: const Text('Dragging'),
1354
          ),
1355
          Stack(
1356
            children: <Widget>[
1357
              DragTarget<DragTargetData>(
1358
                builder: (BuildContext context, List<DragTargetData> data, List<dynamic> rejects) {
1359 1360
                  return IgnorePointer(
                    child: Container(
1361
                      height: 100.0,
1362 1363
                      child: const Text('Target1'),
                    ),
1364
                  );
1365
                }, onAccept: acceptedDragTargetDatas.add,
1366
              ),
1367
              DragTarget<ExtendedDragTargetData>(
1368
                builder: (BuildContext context, List<ExtendedDragTargetData> data, List<dynamic> rejects) {
1369 1370
                  return IgnorePointer(
                    child: Container(
1371
                      height: 100.0,
1372 1373
                      child: const Text('Target2'),
                    ),
1374 1375
                  );
                },
1376
                onAccept: acceptedExtendedDragTargetDatas.add,
1377
              ),
1378 1379 1380 1381
            ],
          ),
        ],
      ),
1382
    ));
1383

1384 1385
    final Offset dragTargetLocation = tester.getCenter(find.text('Source'));
    final Offset targetLocation = tester.getCenter(find.text('Target1'));
1386

1387
    for (int i = 0; i < 2; i += 1) {
1388
      final TestGesture gesture = await tester.startGesture(dragTargetLocation);
1389 1390 1391 1392 1393
      await tester.pump();
      await gesture.moveTo(targetLocation);
      await tester.pump();
      await gesture.up();
      await tester.pump();
1394

1395 1396
      expect(acceptedDragTargetDatas, equals(<DragTargetData>[dragTargetData]));
      expect(acceptedExtendedDragTargetDatas, isEmpty);
1397

1398
      acceptedDragTargetDatas.clear();
1399
      await tester.pump();
1400
    }
1401
  });
1402

1403
  testWidgets('Drag and drop - maxSimultaneousDrags', (WidgetTester tester) async {
1404
    final List<int> accepted = <int>[];
1405 1406

    Widget build(int maxSimultaneousDrags) {
1407 1408
      return MaterialApp(
        home: Column(
1409
          children: <Widget>[
1410
            Draggable<int>(
1411 1412
              data: 1,
              maxSimultaneousDrags: maxSimultaneousDrags,
1413
              child: const Text('Source'),
1414
              feedback: const Text('Dragging'),
1415
            ),
1416
            DragTarget<int>(
1417
              builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1418
                return Container(height: 100.0, child: const Text('Target'));
1419
              },
1420
              onAccept: accepted.add,
1421
            ),
1422 1423
          ],
        ),
1424 1425 1426 1427 1428
      );
    }

    await tester.pumpWidget(build(0));

1429 1430
    final Offset firstLocation = tester.getCenter(find.text('Source'));
    final Offset secondLocation = tester.getCenter(find.text('Target'));
1431 1432 1433 1434 1435 1436

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

1437
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
    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);

1454
    final TestGesture gesture1 = await tester.startGesture(firstLocation, pointer: 8);
1455 1456 1457 1458 1459 1460 1461
    await tester.pump();

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

1462
    final TestGesture gesture2 = await tester.startGesture(firstLocation, pointer: 9);
1463 1464 1465 1466 1467 1468 1469
    await tester.pump();

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

1470
    final TestGesture gesture3 = await tester.startGesture(firstLocation, pointer: 10);
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512
    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);
  });

1513 1514
  testWidgets('Draggable disposes recognizer', (WidgetTester tester) async {
    bool didTap = false;
1515
    await tester.pumpWidget(
1516
      Directionality(
1517
        textDirection: TextDirection.ltr,
1518
        child: Overlay(
1519
          initialEntries: <OverlayEntry>[
1520 1521
            OverlayEntry(
              builder: (BuildContext context) => GestureDetector(
1522 1523 1524
                onTap: () {
                  didTap = true;
                },
1525 1526
                child: Draggable<dynamic>(
                  child: Container(
1527 1528
                    color: const Color(0xFFFFFF00),
                  ),
1529
                  feedback: Container(
1530 1531 1532 1533 1534
                    width: 100.0,
                    height: 100.0,
                    color: const Color(0xFFFF0000),
                  ),
                ),
1535
              ),
1536 1537 1538 1539 1540
            ),
          ],
        ),
      ),
    );
1541

1542
    await tester.startGesture(const Offset(10.0, 10.0));
1543 1544 1545 1546
    expect(didTap, isFalse);

    // This tears down the draggable without terminating the gesture sequence,
    // which used to trigger asserts in the multi-drag gesture recognizer.
1547
    await tester.pumpWidget(Container(key: UniqueKey()));
1548 1549 1550
    expect(didTap, isFalse);
  });

1551
  // Regression test for https://github.com/flutter/flutter/issues/6128.
1552
  testWidgets('Draggable plays nice with onTap', (WidgetTester tester) async {
1553
    await tester.pumpWidget(
1554
      Directionality(
1555
        textDirection: TextDirection.ltr,
1556
        child: Overlay(
1557
          initialEntries: <OverlayEntry>[
1558 1559
            OverlayEntry(
              builder: (BuildContext context) => GestureDetector(
1560
                onTap: () { /* registers a tap recognizer */ },
1561 1562
                child: Draggable<dynamic>(
                  child: Container(
1563 1564
                    color: const Color(0xFFFFFF00),
                  ),
1565
                  feedback: Container(
1566 1567 1568 1569 1570
                    width: 100.0,
                    height: 100.0,
                    color: const Color(0xFFFF0000),
                  ),
                ),
1571
              ),
1572 1573 1574 1575 1576
            ),
          ],
        ),
      ),
    );
1577

1578 1579
    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);
1580

1581
    await firstGesture.moveBy(const Offset(100.0, 0.0));
1582 1583
    await secondGesture.up();
  });
1584 1585

  testWidgets('DragTarget does not set state when remove from the tree', (WidgetTester tester) async {
1586
    final List<String> events = <String>[];
1587
    Offset firstLocation, secondLocation;
1588

1589 1590
    await tester.pumpWidget(MaterialApp(
      home: Column(
1591
        children: <Widget>[
1592
          const Draggable<int>(
1593
            data: 1,
1594 1595
            child: Text('Source'),
            feedback: Text('Dragging')
1596
          ),
1597
          DragTarget<int>(
1598
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1599
              return const Text('Target');
1600 1601 1602
            },
            onAccept: (int data) {
              events.add('drop');
1603
            },
1604
          ),
1605 1606
        ],
      ),
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617
    ));

    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'));
1618
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
1619 1620 1621 1622 1623 1624 1625 1626
    await tester.pump();

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

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

1627 1628
    await tester.pumpWidget(MaterialApp(
      home: Column(
1629
        children: const <Widget>[
1630
          Draggable<int>(
1631
            data: 1,
1632 1633
            child: Text('Source'),
            feedback: Text('Dragging')
1634 1635 1636 1637 1638 1639 1640 1641 1642
          ),
        ]
      )
    ));

    expect(events, isEmpty);
    await gesture.up();
    await tester.pump();
  });
1643 1644

  testWidgets('Drag and drop - remove draggable', (WidgetTester tester) async {
1645
    final List<int> accepted = <int>[];
1646

1647 1648
    await tester.pumpWidget(MaterialApp(
      home: Column(
1649 1650 1651
        children: <Widget>[
          const Draggable<int>(
            data: 1,
1652 1653
            child: Text('Source'),
            feedback: Text('Dragging')
1654
          ),
1655
          DragTarget<int>(
1656
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1657
              return Container(height: 100.0, child: const Text('Target'));
1658 1659 1660 1661 1662
            },
            onAccept: accepted.add,
          ),
        ],
      ),
1663 1664 1665 1666 1667 1668 1669
    ));

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

1670
    final Offset firstLocation = tester.getCenter(find.text('Source'));
1671
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
1672 1673 1674 1675 1676 1677 1678
    await tester.pump();

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

1679 1680
    await tester.pumpWidget(MaterialApp(
      home: Column(
1681
        children: <Widget>[
1682
          DragTarget<int>(
1683
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1684
              return Container(height: 100.0, child: const Text('Target'));
1685 1686 1687 1688 1689
            },
            onAccept: accepted.add,
          ),
        ],
      ),
1690 1691 1692 1693 1694 1695 1696
    ));

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

1697
    final Offset secondLocation = tester.getCenter(find.text('Target'));
1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714
    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);
  });

1715
  testWidgets('Tap above long-press draggable works', (WidgetTester tester) async {
1716
    final List<String> events = <String>[];
1717

1718 1719 1720 1721
    await tester.pumpWidget(MaterialApp(
      home: Material(
        child: Center(
          child: GestureDetector(
1722 1723 1724
            onTap: () {
              events.add('tap');
            },
1725
            child: const LongPressDraggable<int>(
1726 1727
              feedback: Text('Feedback'),
              child: Text('X'),
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
            ),
          ),
        ),
      ),
    ));

    expect(events, isEmpty);
    await tester.tap(find.text('X'));
    expect(events, equals(<String>['tap']));
  });
1738

1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817
  testWidgets('long-press draggable calls onDragEnd called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragEndCalled = false;
    DraggableDetails onDragEndDraggableDetails;

    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          LongPressDraggable<int>(
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragEnd: (DraggableDetails details) {
              onDragEndCalled = true;
              onDragEndDraggableDetails = details;
            },
          ),
          DragTarget<int>(
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
              return 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(onDragEndCalled, 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(onDragEndCalled, isFalse);

    await tester.pump(kLongPressTimeout);

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

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

    final Offset droppedLocation = tester.getTopLeft(find.text('Target'));
    expect(accepted, equals(<int>[1]));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragEndCalled, isTrue);
    expect(onDragEndDraggableDetails, isNotNull);
    expect(onDragEndDraggableDetails.wasAccepted, isTrue);
    expect(onDragEndDraggableDetails.velocity, equals(Velocity.zero));
    expect(onDragEndDraggableDetails.offset,
        equals(
            Offset(droppedLocation.dx, secondLocation.dy - firstLocation.dy)));
  });

1818 1819 1820 1821
  testWidgets('long-press draggable calls onDragCompleted called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool onDragCompletedCalled = false;

1822 1823
    await tester.pumpWidget(MaterialApp(
      home: Column(
1824
        children: <Widget>[
1825
          LongPressDraggable<int>(
1826 1827 1828 1829 1830 1831 1832
            data: 1,
            child: const Text('Source'),
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
            },
          ),
1833
          DragTarget<int>(
1834
            builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
1835
              return Container(height: 100.0, child: const Text('Target'));
1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
            },
            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;

1891 1892
    await tester.pumpWidget(MaterialApp(
      home: LongPressDraggable<int>(
1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920
        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);
  });

1921 1922 1923 1924 1925 1926 1927 1928
  testWidgets('long-press draggable calls Haptic Feedback onStart', (WidgetTester tester) async {
    await _testLongPressDraggableHapticFeedback(tester: tester, hapticFeedbackOnStart: true, expectedHapticFeedbackCount: 1);
  });

  testWidgets('long-press draggable can disable Haptic Feedback', (WidgetTester tester) async {
    await _testLongPressDraggableHapticFeedback(tester: tester, hapticFeedbackOnStart: false, expectedHapticFeedbackCount: 0);
  });

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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);
  });
1936 1937 1938


  testWidgets('Drag and drop can contribute semantics', (WidgetTester tester) async {
1939 1940 1941
    final SemanticsTester semantics = SemanticsTester(tester);
    await tester.pumpWidget(MaterialApp(
        home: ListView(
1942
          scrollDirection: Axis.horizontal,
1943
          addSemanticIndexes: false,
1944
          children: <Widget>[
1945
            DragTarget<int>(
1946 1947 1948 1949
              builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
                return const Text('Target');
              },
            ),
1950
            Container(width: 400.0),
1951 1952
            const Draggable<int>(
              data: 1,
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              child: Text('H'),
              feedback: Text('H'),
              childWhenDragging: SizedBox(),
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              axis: Axis.horizontal,
              ignoringFeedbackSemantics: false,
            ),
            const Draggable<int>(
              data: 2,
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              child: Text('V'),
              feedback: Text('V'),
              childWhenDragging: SizedBox(),
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              axis: Axis.vertical,
              ignoringFeedbackSemantics: false,
            ),
            const Draggable<int>(
              data: 3,
1969 1970 1971
              child: Text('N'),
              feedback: Text('N'),
              childWhenDragging: SizedBox(),
1972 1973 1974 1975
            ),
          ],
        ),
    ));
1976

1977
    expect(semantics, hasSemantics(
1978
      TestSemantics.root(
1979
        children: <TestSemantics>[
1980
          TestSemantics(
1981 1982 1983
            id: 1,
            textDirection: TextDirection.ltr,
            children: <TestSemantics>[
1984
              TestSemantics(
1985 1986 1987
                id: 2,
                flags: <SemanticsFlag>[SemanticsFlag.scopesRoute],
                children: <TestSemantics>[
1988
                  TestSemantics(
1989 1990
                    id: 3,
                    children: <TestSemantics>[
1991
                      TestSemantics(
1992
                        id: 8,
1993
                        flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
1994 1995
                        actions: <SemanticsAction>[SemanticsAction.scrollLeft],
                        children: <TestSemantics>[
1996
                          TestSemantics(
1997 1998 1999 2000 2001
                            id: 4,
                            tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                            label: 'Target',
                            textDirection: TextDirection.ltr,
                          ),
2002
                          TestSemantics(
2003 2004 2005 2006 2007
                            id: 5,
                            tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                            label: 'H',
                            textDirection: TextDirection.ltr,
                          ),
2008
                          TestSemantics(
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                            id: 6,
                            tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                            label: 'V',
                            textDirection: TextDirection.ltr,
                          ),
2014
                          TestSemantics(
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
                            id: 7,
                            tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                            label: 'N',
                            textDirection: TextDirection.ltr,
                          ),
                        ],
                      ),
                    ],
                  ),
                ],
              ),
            ],
          ),
        ],
    ), ignoreTransform: true, ignoreRect: true));

    final Offset firstLocation = tester.getTopLeft(find.text('N'));
    final Offset secondLocation = firstLocation + const Offset(300.0, 300.0);
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump();
2037

2038
    expect(semantics, hasSemantics(
2039
      TestSemantics.root(
2040
        children: <TestSemantics>[
2041
          TestSemantics(
2042 2043 2044
            id: 1,
            textDirection: TextDirection.ltr,
            children: <TestSemantics>[
2045
              TestSemantics(
2046 2047 2048
                id: 2,
                flags: <SemanticsFlag>[SemanticsFlag.scopesRoute],
                children: <TestSemantics>[
2049
                  TestSemantics(
2050 2051
                    id: 3,
                    children: <TestSemantics>[
2052
                      TestSemantics(
2053
                        id: 8,
2054
                        flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
2055
                        children: <TestSemantics>[
2056
                          TestSemantics(
2057 2058 2059 2060 2061
                            id: 4,
                            tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                            label: 'Target',
                            textDirection: TextDirection.ltr,
                          ),
2062
                          TestSemantics(
2063 2064 2065 2066 2067
                            id: 5,
                            tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                            label: 'H',
                            textDirection: TextDirection.ltr,
                          ),
2068
                          TestSemantics(
2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087
                            id: 6,
                            tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                            label: 'V',
                            textDirection: TextDirection.ltr,
                          ),
                          /// N is moved offscreen.
                        ],
                      ),
                    ],
                  ),
                ],
              ),
            ],
          ),
        ],
    ), ignoreTransform: true, ignoreRect: true));
    semantics.dispose();
  });

2088 2089
}

2090
Future<void> _testLongPressDraggableHapticFeedback({WidgetTester tester, bool hapticFeedbackOnStart, int expectedHapticFeedbackCount}) async {
2091 2092 2093 2094 2095 2096 2097 2098 2099
  bool onDragStartedCalled = false;

  int hapticFeedbackCalls = 0;
  SystemChannels.platform.setMockMethodCallHandler((MethodCall methodCall) async {
    if (methodCall.method == 'HapticFeedback.vibrate') {
      hapticFeedbackCalls++;
    }
  });

2100 2101
  await tester.pumpWidget(MaterialApp(
    home: LongPressDraggable<int>(
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      data: 1,
      child: const Text('Source'),
      feedback: const Text('Dragging'),
      hapticFeedbackOnStart: hapticFeedbackOnStart,
      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);
  expect(hapticFeedbackCalls, expectedHapticFeedbackCount);
}

2132
Future<void> _testChildAnchorFeedbackPosition({WidgetTester tester, double top = 0.0, double left = 0.0}) async {
2133
  final List<int> accepted = <int>[];
2134 2135
  int dragStartedCount = 0;

2136
  await tester.pumpWidget(
2137
    Stack(
2138 2139
      textDirection: TextDirection.ltr,
      children: <Widget>[
2140
        Positioned(
2141 2142 2143 2144
          left: left,
          top: top,
          right: 0.0,
          bottom: 0.0,
2145 2146
          child: MaterialApp(
            home: Column(
2147
              children: <Widget>[
2148
                Draggable<int>(
2149 2150 2151 2152 2153 2154 2155
                  data: 1,
                  child: const Text('Source'),
                  feedback: const Text('Dragging'),
                  onDragStarted: () {
                    ++dragStartedCount;
                  },
                ),
2156
                DragTarget<int>(
2157
                  builder: (BuildContext context, List<int> data, List<dynamic> rejects) {
2158
                    return Container(height: 100.0, child: const Text('Target'));
2159 2160 2161 2162
                  },
                  onAccept: accepted.add,
                ),
              ],
2163
            ),
2164 2165 2166 2167 2168
          ),
        ),
      ],
    ),
  );
2169 2170 2171 2172 2173 2174 2175

  expect(accepted, isEmpty);
  expect(find.text('Source'), findsOneWidget);
  expect(find.text('Dragging'), findsNothing);
  expect(find.text('Target'), findsOneWidget);
  expect(dragStartedCount, 0);

2176
  final Offset firstLocation = tester.getCenter(find.text('Source'));
2177
  final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
2178 2179 2180 2181 2182 2183 2184 2185 2186
  await tester.pump();

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


2187
  final Offset secondLocation = tester.getBottomRight(find.text('Target'));
2188 2189 2190 2191 2192 2193 2194 2195 2196
  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);

2197 2198
  final Offset feedbackTopLeft = tester.getTopLeft(find.text('Dragging'));
  final Offset sourceTopLeft = tester.getTopLeft(find.text('Source'));
2199
  final Offset dragOffset = secondLocation - firstLocation;
2200
  expect(feedbackTopLeft, equals(sourceTopLeft + dragOffset));
2201 2202
}

2203
class DragTargetData { }
2204

2205
class ExtendedDragTargetData extends DragTargetData { }