draggable_test.dart 112 KB
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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// TODO(gspencergoog): Remove this tag once this test's state leaks/test
// dependencies have been fixed.
// https://github.com/flutter/flutter/issues/85160
// Fails with "flutter test --test-randomize-ordering-seed=123"
@Tags(<String>['no-shuffle'])

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import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
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import 'package:flutter/semantics.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter_test/flutter_test.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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    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
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    int dragStartedCount = 0;
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    int moveCount = 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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            feedback: const Text('Dragging'),
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            onDragStarted: () {
              ++dragStartedCount;
            },
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            child: const Text('Source'),
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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 SizedBox(height: 100.0, child: Text('Target'));
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            },
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            onMove: (_) => moveCount++,
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            onAccept: accepted.add,
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            onAcceptWithDetails: acceptedDetails.add,
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          ),
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        ],
      ),
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    ));

    expect(accepted, isEmpty);
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    expect(acceptedDetails, isEmpty);
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    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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    expect(moveCount, 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);
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    expect(acceptedDetails, isEmpty);
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    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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    expect(moveCount, 0);
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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);
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    expect(acceptedDetails, isEmpty);
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    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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    expect(moveCount, 1);
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    await gesture.up();
    await tester.pump();
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    expect(accepted, equals(<int>[1]));
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    expect(acceptedDetails, hasLength(1));
    expect(acceptedDetails.first.offset, const Offset(256.0, 74.0));
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    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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    expect(moveCount, 1);
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  });
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  // Regression test for https://github.com/flutter/flutter/issues/76825
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  testWidgets('Drag and drop - onLeave callback fires correctly with generic parameter', (WidgetTester tester) async {
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    final Map<String,int> leftBehind = <String,int>{
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      'Target 1': 0,
      'Target 2': 0,
    };

    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          const Draggable<int>(
            data: 1,
            feedback: Text('Dragging'),
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            child: Text('Source'),
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          ),
          DragTarget<int>(
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
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              return const SizedBox(height: 100.0, child: Text('Target 1'));
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            },
            onLeave: (int? data) {
              if (data != null) {
                leftBehind['Target 1'] = leftBehind['Target 1']! + data;
              }
            },
          ),
          DragTarget<int>(
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
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              return const SizedBox(height: 100.0, child: Text('Target 2'));
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            },
            onLeave: (int? data) {
              if (data != null) {
                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 - onLeave callback fires correctly', (WidgetTester tester) async {
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    final Map<String,int> leftBehind = <String,int>{
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      '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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            feedback: Text('Dragging'),
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            child: Text('Source'),
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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 SizedBox(height: 100.0, child: Text('Target 1'));
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            },
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            onLeave: (Object? data) {
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              if (data is int) {
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                leftBehind['Target 1'] = leftBehind['Target 1']! + data;
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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 const SizedBox(height: 100.0, child: Text('Target 2'));
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            },
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            onLeave: (Object? data) {
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              if (data is int) {
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                leftBehind['Target 2'] = leftBehind['Target 2']! + data;
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              }
            },
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          ),
        ],
      ),
    ));

    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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  });
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  // Regression test for https://github.com/flutter/flutter/issues/76825
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  testWidgets('Drag and drop - onMove callback fires correctly with generic parameter', (WidgetTester tester) async {
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    final Map<String,int> targetMoveCount = <String,int>{
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      'Target 1': 0,
      'Target 2': 0,
    };

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

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

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

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

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

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

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

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

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

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

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  testWidgets('Drag and drop - onMove callback fires correctly', (WidgetTester tester) async {
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    final Map<String,int> targetMoveCount = <String,int>{
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      'Target 1': 0,
      'Target 2': 0,
    };

    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          const Draggable<int>(
            data: 1,
            feedback: Text('Dragging'),
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            child: Text('Source'),
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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 SizedBox(height: 100.0, child: Text('Target 1'));
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            },
            onMove: (DragTargetDetails<dynamic> details) {
              if (details.data is int) {
                targetMoveCount['Target 1'] =
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                    targetMoveCount['Target 1']! + (details.data as int);
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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 SizedBox(height: 100.0, child: Text('Target 2'));
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            },
            onMove: (DragTargetDetails<dynamic> details) {
              if (details.data is int) {
                targetMoveCount['Target 2'] =
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                    targetMoveCount['Target 2']! + (details.data as int);
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              }
            },
          ),
        ],
      ),
    ));

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

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

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

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

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

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

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

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

    expect(targetMoveCount['Target 1'], equals(2));
    expect(targetMoveCount['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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            feedback: Text('Dragging'),
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            child: Text('Source'),
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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: const Text('Button'),
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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 IgnorePointer(
                    child: Text('Target'),
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                  );
                },
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                onAccept: (int? data) {
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                  events.add('drop');
                },
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                onAcceptWithDetails: (DragTargetDetails<int> _) {
                  events.add('details');
                },
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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'), warnIfMissed: false); // (inside IgnorePointer)
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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', 'details']));
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    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'));
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    await tester.tap(find.text('Target'), warnIfMissed: false); // (inside IgnorePointer)
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    await gesture.up();
    await tester.pump();
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    expect(events, equals(<String>['tap', 'tap', 'drop', 'details']));
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    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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            feedback: const Text('Dragging'),
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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: 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 const Text('Target');
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            },
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            onAccept: (int? data) {
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              events.add('drop');
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            },
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            onAcceptWithDetails: (DragTargetDetails<int> _) {
              events.add('details');
            },
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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', 'details']));
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    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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            feedback: Text('Dragging'),
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            child: Text('Source'),
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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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            },
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            onAccept: (int? data) {
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              events.add('drop');
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            },
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            onAcceptWithDetails: (DragTargetDetails<int> _) {
              events.add('details');
            },
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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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            feedback: Text('Dragging'),
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            child: Text('Source'),
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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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            },
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            onAccept: (int? data) {
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              events.add('drop');
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            },
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            onAcceptWithDetails: (DragTargetDetails<int> _) {
              events.add('details');
            },
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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', 'details']));
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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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        dragStartBehavior: DragStartBehavior.down,
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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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            },
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            onAccept: (int? data) {
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              events.add('drop $data');
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            },
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            onAcceptWithDetails: (DragTargetDetails<int> _) {
              events.add('details');
            },
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          ),
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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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            feedback: Text('Dragging'),
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            affinity: Axis.horizontal,
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            child: Text('H'),
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          ),
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          const Draggable<int>(
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            data: 2,
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            feedback: Text('Dragging'),
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            affinity: Axis.vertical,
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            child: Text('V'),
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          ),
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          Container(height: 500.0),
          Container(height: 500.0),
          Container(height: 500.0),
          Container(height: 500.0),
682 683
        ],
      ),
684 685 686 687 688 689 690 691 692 693 694
    ));

    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();
701
    expect(events, equals(<String>['drop 2', 'details']));
702
    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();
718
    expect(events, equals(<String>['drop 1', 'details']));
719
    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'));
728 729 730 731 732 733 734 735
    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();
736
    expect(events, equals(<String>['drop 2', 'details']));
737
    expect(tester.getCenter(find.text('Target')).dy, greaterThan(0.0));
738 739 740 741 742 743 744
    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'));
745 746 747 748 749 750
    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();
751
    expect(events, equals(<String>[]));
752
    expect(find.text('Target'), findsNothing);
753 754
    events.clear();
  });
755

756
  testWidgets('Drag and drop - horizontal and vertical draggables in horizontal block', (WidgetTester tester) async {
757
    final List<String> events = <String>[];
758
    Offset firstLocation, secondLocation, thirdLocation;
759

760 761
    await tester.pumpWidget(MaterialApp(
      home: ListView(
762
        dragStartBehavior: DragStartBehavior.down,
763 764
        scrollDirection: Axis.horizontal,
        children: <Widget>[
765
          DragTarget<int>(
766
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
767
              return const Text('Target');
768
            },
769
            onAccept: (int? data) {
770
              events.add('drop $data');
771
            },
772 773 774
            onAcceptWithDetails: (DragTargetDetails<int> _) {
              events.add('details');
            },
775
          ),
776
          Container(width: 400.0),
777
          const Draggable<int>(
778
            data: 1,
779
            feedback: Text('Dragging'),
780
            affinity: Axis.horizontal,
781
            child: Text('H'),
782
          ),
783
          const Draggable<int>(
784
            data: 2,
785
            feedback: Text('Dragging'),
786
            affinity: Axis.vertical,
787
            child: Text('V'),
788
          ),
789 790 791 792
          Container(width: 500.0),
          Container(width: 500.0),
          Container(width: 500.0),
          Container(width: 500.0),
793 794
        ],
      ),
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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'));
806 807 808 809 810 811
    TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();
    await gesture.moveTo(secondLocation);
    await tester.pump();
    await gesture.up();
    await tester.pump();
812
    expect(events, equals(<String>['drop 1', 'details']));
813
    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'));
821 822 823 824 825 826 827 828
    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();
829
    expect(events, equals(<String>['drop 2', 'details']));
830
    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'));
839 840 841 842 843 844 845 846
    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();
847
    expect(events, equals(<String>['drop 1', 'details']));
848
    expect(tester.getCenter(find.text('Target')).dx, greaterThan(0.0));
849 850 851 852 853 854 855
    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'));
856 857 858 859 860 861
    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();
862
    expect(events, equals(<String>[]));
863
    expect(find.text('Target'), findsNothing);
864 865
    events.clear();
  });
866

867 868 869 870
  group('Drag and drop - Draggables with a set axis only move along that axis', () {
    final List<String> events = <String>[];

    Widget build() {
871 872
      return MaterialApp(
        home: ListView(
873 874
          scrollDirection: Axis.horizontal,
          children: <Widget>[
875
            DragTarget<int>(
876
              builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
877 878
                return const Text('Target');
              },
879
              onAccept: (int? data) {
880
                events.add('drop $data');
881
              },
882 883 884
              onAcceptWithDetails: (DragTargetDetails<int> _) {
                events.add('details');
              },
885
            ),
886
            Container(width: 400.0),
887 888
            const Draggable<int>(
              data: 1,
889 890
              feedback: Text('H'),
              childWhenDragging: SizedBox(),
891
              axis: Axis.horizontal,
892
              child: Text('H'),
893 894 895
            ),
            const Draggable<int>(
              data: 2,
896 897
              feedback: Text('V'),
              childWhenDragging: SizedBox(),
898
              axis: Axis.vertical,
899
              child: Text('V'),
900 901 902
            ),
            const Draggable<int>(
              data: 3,
903 904
              feedback: Text('N'),
              childWhenDragging: SizedBox(),
905
              child: Text('N'),
906
            ),
907 908 909 910
            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);
    });

963
    testWidgets('Vertical axis draggable moves vertically', (WidgetTester tester) async {
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995
      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);
    });
  });
996

997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
  group('Drag and drop - onDragUpdate called if draggable moves along a set axis', () {
    int updated = 0;
    Offset dragDelta = Offset.zero;

    setUp(() {
      updated = 0;
      dragDelta = Offset.zero;
    });

    Widget build() {
      return MaterialApp(
        home: Column(
          children: <Widget>[
            Draggable<int>(
              data: 1,
              feedback: const Text('Dragging'),
              onDragUpdate: (DragUpdateDetails details) {
                dragDelta += details.delta;
                updated++;
              },
1017
              child: const Text('Source'),
1018 1019 1020 1021 1022 1023 1024 1025 1026
            ),
            Draggable<int>(
              data: 2,
              feedback: const Text('Vertical Dragging'),
              onDragUpdate: (DragUpdateDetails details) {
                dragDelta += details.delta;
                updated++;
              },
              axis: Axis.vertical,
1027
              child: const Text('Vertical Source'),
1028 1029 1030 1031 1032 1033 1034 1035 1036
            ),
            Draggable<int>(
              data: 3,
              feedback: const Text('Horizontal Dragging'),
              onDragUpdate: (DragUpdateDetails details) {
                dragDelta += details.delta;
                updated++;
              },
              axis: Axis.horizontal,
1037
              child: const Text('Horizontal Source'),
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
            ),
          ],
        ),
      );
    }

    testWidgets('Null axis onDragUpdate called only if draggable moves in any direction', (WidgetTester tester) async {
      await tester.pumpWidget(build());

      expect(updated, 0);
      expect(find.text('Source'), findsOneWidget);
      expect(find.text('Dragging'), findsNothing);

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

      expect(updated, 0);
      expect(find.text('Source'), findsOneWidget);
      expect(find.text('Dragging'), findsOneWidget);

      await gesture.moveBy(const Offset(10, 10));
      await tester.pump();

      expect(updated, 1);

      await gesture.moveBy(Offset.zero);
      await tester.pump();

      expect(updated, 1);

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

      expect(updated, 1);
      expect(find.text('Source'), findsOneWidget);
      expect(find.text('Dragging'), findsNothing);
      expect(dragDelta.dx, 10);
      expect(dragDelta.dy, 10);
    });

    testWidgets('Vertical axis onDragUpdate only called if draggable moves vertical', (WidgetTester tester) async {
      await tester.pumpWidget(build());

      expect(updated, 0);
      expect(find.text('Vertical Source'), findsOneWidget);
      expect(find.text('Vertical Dragging'), findsNothing);

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

      expect(updated, 0);
      expect(find.text('Vertical Source'), findsOneWidget);
      expect(find.text('Vertical Dragging'), findsOneWidget);

      await gesture.moveBy(const Offset(0, 10));
      await tester.pump();

      expect(updated, 1);

      await gesture.moveBy(const Offset(10 , 0));
      await tester.pump();

      expect(updated, 1);

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

      expect(updated, 1);
      expect(find.text('Vertical Source'), findsOneWidget);
      expect(find.text('Vertical Dragging'), findsNothing);
      expect(dragDelta.dx, 0);
      expect(dragDelta.dy, 10);
    });

    testWidgets('Horizontal axis onDragUpdate only called if draggable moves horizontal', (WidgetTester tester) async {
      await tester.pumpWidget(build());

      expect(updated, 0);
      expect(find.text('Horizontal Source'), findsOneWidget);
      expect(find.text('Horizontal Dragging'), findsNothing);

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

      expect(updated, 0);
      expect(find.text('Horizontal Source'), findsOneWidget);
      expect(find.text('Horizontal Dragging'), findsOneWidget);

      await gesture.moveBy(const Offset(0, 10));
      await tester.pump();

      expect(updated, 0);

      await gesture.moveBy(const Offset(10 , 0));
      await tester.pump();

      expect(updated, 1);

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

      expect(updated, 1);
      expect(find.text('Horizontal Source'), findsOneWidget);
      expect(find.text('Horizontal Dragging'), findsNothing);
      expect(dragDelta.dx, 10);
      expect(dragDelta.dy, 0);
    });
  });
1149

1150
  testWidgets('Drag and drop - onDraggableCanceled not called if dropped on accepting target', (WidgetTester tester) async {
1151
    final List<int> accepted = <int>[];
1152
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
1153
    bool onDraggableCanceledCalled = false;
1154

1155 1156
    await tester.pumpWidget(MaterialApp(
      home: Column(
1157
        children: <Widget>[
1158
          Draggable<int>(
1159
            data: 1,
1160
            feedback: const Text('Dragging'),
1161 1162
            onDraggableCanceled: (Velocity velocity, Offset offset) {
              onDraggableCanceledCalled = true;
1163
            },
1164
            child: const Text('Source'),
1165
          ),
1166
          DragTarget<int>(
1167
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1168
              return const SizedBox(height: 100.0, child: Text('Target'));
1169
            },
1170
            onAccept: accepted.add,
1171
            onAcceptWithDetails: acceptedDetails.add,
1172
          ),
1173 1174
        ],
      ),
1175 1176 1177
    ));

    expect(accepted, isEmpty);
1178
    expect(acceptedDetails, isEmpty);
1179 1180 1181 1182 1183
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

1184
    final Offset firstLocation = tester.getCenter(find.text('Source'));
1185
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
1186
    await tester.pump();
1187 1188

    expect(accepted, isEmpty);
1189
    expect(acceptedDetails, isEmpty);
1190 1191 1192 1193 1194
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

1195
    final Offset secondLocation = tester.getCenter(find.text('Target'));
1196 1197
    await gesture.moveTo(secondLocation);
    await tester.pump();
1198 1199

    expect(accepted, isEmpty);
1200
    expect(acceptedDetails, isEmpty);
1201 1202 1203 1204 1205
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

1206 1207
    await gesture.up();
    await tester.pump();
1208 1209

    expect(accepted, equals(<int>[1]));
1210 1211
    expect(acceptedDetails, hasLength(1));
    expect(acceptedDetails.first.offset, const Offset(256.0, 74.0));
1212 1213 1214 1215
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);
1216 1217
  });

1218
  testWidgets('Drag and drop - onDraggableCanceled called if dropped on non-accepting target', (WidgetTester tester) async {
1219
    final List<int> accepted = <int>[];
1220
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
1221
    bool onDraggableCanceledCalled = false;
1222 1223
    late Velocity onDraggableCanceledVelocity;
    late Offset onDraggableCanceledOffset;
1224

1225 1226
    await tester.pumpWidget(MaterialApp(
      home: Column(
1227
        children: <Widget>[
1228
          Draggable<int>(
1229
            data: 1,
1230
            feedback: const Text('Dragging'),
1231 1232 1233 1234
            onDraggableCanceled: (Velocity velocity, Offset offset) {
              onDraggableCanceledCalled = true;
              onDraggableCanceledVelocity = velocity;
              onDraggableCanceledOffset = offset;
1235
            },
1236
            child: const Text('Source'),
1237
          ),
1238
          DragTarget<int>(
1239
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1240
              return const SizedBox(
1241
                height: 100.0,
1242
                child: Text('Target'),
1243 1244
              );
            },
1245
            onWillAccept: (int? data) => false,
1246
            onAccept: accepted.add,
1247
            onAcceptWithDetails: acceptedDetails.add,
1248
          ),
1249 1250
        ],
      ),
1251 1252 1253
    ));

    expect(accepted, isEmpty);
1254
    expect(acceptedDetails, isEmpty);
1255 1256 1257 1258 1259
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

1260
    final Offset firstLocation = tester.getTopLeft(find.text('Source'));
1261
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
1262
    await tester.pump();
1263 1264

    expect(accepted, isEmpty);
1265
    expect(acceptedDetails, isEmpty);
1266 1267 1268 1269 1270
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

1271
    final Offset secondLocation = tester.getCenter(find.text('Target'));
1272 1273
    await gesture.moveTo(secondLocation);
    await tester.pump();
1274 1275

    expect(accepted, isEmpty);
1276
    expect(acceptedDetails, isEmpty);
1277 1278 1279 1280 1281
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

1282 1283
    await gesture.up();
    await tester.pump();
1284 1285

    expect(accepted, isEmpty);
1286
    expect(acceptedDetails, isEmpty);
1287 1288 1289 1290 1291
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isTrue);
    expect(onDraggableCanceledVelocity, equals(Velocity.zero));
1292
    expect(onDraggableCanceledOffset, equals(Offset(secondLocation.dx, secondLocation.dy)));
1293
  });
1294

1295
  testWidgets('Drag and drop - onDraggableCanceled called if dropped on non-accepting target with correct velocity', (WidgetTester tester) async {
1296
    final List<int> accepted = <int>[];
1297
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
1298
    bool onDraggableCanceledCalled = false;
1299 1300
    late Velocity onDraggableCanceledVelocity;
    late Offset onDraggableCanceledOffset;
1301

1302 1303 1304
    await tester.pumpWidget(MaterialApp(
      home: Column(children: <Widget>[
        Draggable<int>(
1305
          data: 1,
1306
          feedback: const Text('Source'),
1307 1308 1309 1310
          onDraggableCanceled: (Velocity velocity, Offset offset) {
            onDraggableCanceledCalled = true;
            onDraggableCanceledVelocity = velocity;
            onDraggableCanceledOffset = offset;
1311
          },
1312
          child: const Text('Source'),
1313
        ),
1314
        DragTarget<int>(
1315
          builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1316
            return const SizedBox(height: 100.0, child: Text('Target'));
1317
          },
1318
          onWillAccept: (int? data) => false,
1319
          onAccept: accepted.add,
1320 1321
          onAcceptWithDetails: acceptedDetails.add,
        ),
1322 1323
      ]),
    ));
1324 1325

    expect(accepted, isEmpty);
1326
    expect(acceptedDetails, isEmpty);
1327 1328 1329 1330 1331
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDraggableCanceledCalled, isFalse);

1332
    final Offset flingStart = tester.getTopLeft(find.text('Source'));
1333
    await tester.flingFrom(flingStart, const Offset(0.0, 100.0), 1000.0);
1334
    await tester.pump();
1335 1336

    expect(accepted, isEmpty);
1337
    expect(acceptedDetails, isEmpty);
1338 1339 1340 1341 1342 1343
    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));
1344
    expect(onDraggableCanceledOffset, equals(Offset(flingStart.dx, flingStart.dy) + const Offset(0.0, 100.0)));
1345
  });
1346

1347 1348
  testWidgets('Drag and drop - onDragEnd not called if dropped on non-accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
1349
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
1350
    bool onDragEndCalled = false;
1351
    late DraggableDetails onDragEndDraggableDetails;
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          Draggable<int>(
            data: 1,
            feedback: const Text('Dragging'),
            onDragEnd: (DraggableDetails details) {
              onDragEndCalled = true;
              onDragEndDraggableDetails = details;
            },
1362
            child: const Text('Source'),
1363 1364
          ),
          DragTarget<int>(
1365
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1366
              return const SizedBox(height: 100.0, child: Text('Target'));
1367
            },
1368
            onWillAccept: (int? data) => false,
1369
            onAccept: accepted.add,
1370
            onAcceptWithDetails: acceptedDetails.add,
1371 1372 1373 1374 1375 1376
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);
1377
    expect(acceptedDetails, isEmpty);
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
    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);
1388
    expect(acceptedDetails, isEmpty);
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
    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);
1399
    expect(acceptedDetails, isEmpty);
1400 1401 1402 1403 1404 1405 1406 1407 1408
    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);
1409
    expect(acceptedDetails, isEmpty);
1410 1411 1412 1413 1414 1415 1416
    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));
1417 1418 1419 1420
    expect(
      onDragEndDraggableDetails.offset,
      equals(Offset(secondLocation.dx, secondLocation.dy - firstLocation.dy)),
    );
1421 1422
  });

1423 1424 1425 1426 1427 1428 1429
  testWidgets('Drag and drop - DragTarget rebuilds with and without rejected data when a rejected draggable enters and leaves', (WidgetTester tester) async {
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          const Draggable<int>(
            data: 1,
            feedback: Text('Dragging'),
1430
            child: Text('Source'),
1431 1432
          ),
          DragTarget<int>(
1433
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1434
              return SizedBox(
1435 1436 1437 1438 1439 1440
                height: 100.0,
                child: rejects.isNotEmpty
                    ? const Text('Rejected')
                    : const Text('Target'),
              );
            },
1441
            onWillAccept: (int? data) => false,
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487
          ),
        ],
      ),
    ));

    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Rejected'), findsNothing);

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

    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Rejected'), findsNothing);

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

    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsNothing);
    expect(find.text('Rejected'), findsOneWidget);

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

    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Rejected'), findsNothing);
  });


  testWidgets('Drag and drop - Can drag and drop over a non-accepting target multiple times', (WidgetTester tester) async {
    int numberOfTimesOnDraggableCanceledCalled = 0;
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          Draggable<int>(
            data: 1,
            feedback: const Text('Dragging'),
          onDraggableCanceled: (Velocity velocity, Offset offset) {
            numberOfTimesOnDraggableCanceledCalled++;
          },
1488
            child: const Text('Source'),
1489 1490
          ),
          DragTarget<int>(
1491
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1492
              return SizedBox(
1493 1494 1495 1496 1497 1498
                height: 100.0,
                child: rejects.isNotEmpty
                    ? const Text('Rejected')
                    : const Text('Target'),
              );
            },
1499
            onWillAccept: (int? data) => false,
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558
          ),
        ],
      ),
    ));

    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Rejected'), findsNothing);

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

    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Rejected'), findsNothing);

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

    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsNothing);
    expect(find.text('Rejected'), findsOneWidget);

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

    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Rejected'), findsNothing);
    expect(numberOfTimesOnDraggableCanceledCalled, 1);

    // Drag and drop the Draggable onto the Target a second time.
    final TestGesture secondGesture =
    await tester.startGesture(firstLocation, pointer: 7);
    await tester.pump();

    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Rejected'), findsNothing);

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

    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsNothing);
    expect(find.text('Rejected'), findsOneWidget);

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

    expect(numberOfTimesOnDraggableCanceledCalled, 2);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(find.text('Rejected'), findsNothing);
  });

1559 1560
  testWidgets('Drag and drop - onDragCompleted not called if dropped on non-accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
1561
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
1562 1563
    bool onDragCompletedCalled = false;

1564 1565
    await tester.pumpWidget(MaterialApp(
      home: Column(
1566
        children: <Widget>[
1567
          Draggable<int>(
1568 1569 1570 1571
            data: 1,
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
1572
            },
1573
            child: const Text('Source'),
1574
          ),
1575
          DragTarget<int>(
1576
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1577
              return const SizedBox(
1578
                height: 100.0,
1579
                child: Text('Target'),
1580 1581
              );
            },
1582
            onWillAccept: (int? data) => false,
1583
            onAccept: accepted.add,
1584
            onAcceptWithDetails: acceptedDetails.add,
1585
          ),
1586 1587
        ],
      ),
1588 1589 1590
    ));

    expect(accepted, isEmpty);
1591
    expect(acceptedDetails, isEmpty);
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
    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);
1602
    expect(acceptedDetails, isEmpty);
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
    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);
1613
    expect(acceptedDetails, isEmpty);
1614 1615 1616 1617 1618 1619 1620 1621 1622
    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);
1623
    expect(acceptedDetails, isEmpty);
1624 1625 1626 1627 1628 1629
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isFalse);
  });

1630 1631
  testWidgets('Drag and drop - onDragEnd called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
1632
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
1633
    bool onDragEndCalled = false;
1634
    late DraggableDetails onDragEndDraggableDetails;
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          Draggable<int>(
            data: 1,
            feedback: const Text('Dragging'),
            onDragEnd: (DraggableDetails details) {
              onDragEndCalled = true;
              onDragEndDraggableDetails = details;
            },
1645
            child: const Text('Source'),
1646 1647
          ),
          DragTarget<int>(
1648
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1649
              return const SizedBox(height: 100.0, child: Text('Target'));
1650
            },
1651
            onAccept: accepted.add,
1652
            onAcceptWithDetails: acceptedDetails.add,
1653 1654 1655 1656 1657 1658
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);
1659
    expect(acceptedDetails, isEmpty);
1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
    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);
1670
    expect(acceptedDetails, isEmpty);
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
    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);
1681
    expect(acceptedDetails, isEmpty);
1682 1683 1684 1685 1686 1687 1688 1689 1690
    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'));
1691 1692
    final Offset expectedDropOffset = Offset(droppedLocation.dx, secondLocation.dy - firstLocation.dy);

1693
    expect(accepted, equals(<int>[1]));
1694 1695
    expect(acceptedDetails, hasLength(1));
    expect(acceptedDetails.first.offset, const Offset(256.0, 74.0));
1696 1697 1698 1699 1700 1701 1702
    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));
1703
    expect(onDragEndDraggableDetails.offset, equals(expectedDropOffset));
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718
  });

  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,
              feedback: const Text('Dragging'),
              onDragEnd: (DraggableDetails details) {
                timesOnDragEndCalled++;
              },
1719
              child: const Text('Source'),
1720 1721
          ),
          DragTarget<int>(
1722
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1723 1724
              return const Text('Target');
            },
1725
            onAccept: (int? data) {
1726 1727
              events.add('drop');
            },
1728 1729 1730
            onAcceptWithDetails: (DragTargetDetails<int> _) {
              events.add('details');
            },
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
          ),
        ],
      ),
    ));

    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,
1759
                  feedback: Text('Dragging'),
1760
                  child: Text('Source'),
1761
              ),
1762 1763
            ],
        ),
1764 1765 1766 1767 1768 1769 1770 1771
    ));

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

1772 1773
  testWidgets('Drag and drop - onDragCompleted called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
1774
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
1775 1776
    bool onDragCompletedCalled = false;

1777 1778
    await tester.pumpWidget(MaterialApp(
      home: Column(
1779
        children: <Widget>[
1780
          Draggable<int>(
1781 1782 1783 1784
            data: 1,
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
1785
            },
1786
            child: const Text('Source'),
1787
          ),
1788
          DragTarget<int>(
1789
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1790
              return const SizedBox(height: 100.0, child: Text('Target'));
1791
            },
1792
            onAccept: accepted.add,
1793
            onAcceptWithDetails: acceptedDetails.add,
1794
          ),
1795 1796
        ],
      ),
1797 1798 1799
    ));

    expect(accepted, isEmpty);
1800
    expect(acceptedDetails, isEmpty);
1801 1802 1803 1804 1805 1806 1807 1808 1809 1810
    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);
1811
    expect(acceptedDetails, isEmpty);
1812 1813 1814 1815 1816 1817 1818 1819 1820 1821
    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);
1822
    expect(acceptedDetails, isEmpty);
1823 1824 1825 1826 1827 1828 1829 1830 1831
    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]));
1832 1833
    expect(acceptedDetails, hasLength(1));
    expect(acceptedDetails.first.offset, const Offset(256.0, 74.0));
1834 1835 1836 1837 1838 1839
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
    expect(onDragCompletedCalled, isTrue);
  });

1840
  testWidgets('Drag and drop - allow pass through of unaccepted data test', (WidgetTester tester) async {
1841
    final List<int> acceptedInts = <int>[];
1842
    final List<DragTargetDetails<int>> acceptedIntsDetails = <DragTargetDetails<int>>[];
1843
    final List<double> acceptedDoubles = <double>[];
1844
    final List<DragTargetDetails<double>> acceptedDoublesDetails = <DragTargetDetails<double>>[];
1845

1846 1847
    await tester.pumpWidget(MaterialApp(
      home: Column(
1848
        children: <Widget>[
1849
          const Draggable<int>(
1850
            data: 1,
1851
            feedback: Text('IntDragging'),
1852
            child: Text('IntSource'),
1853
          ),
1854
          const Draggable<double>(
1855
            data: 1.0,
1856
            feedback: Text('DoubleDragging'),
1857
            child: Text('DoubleSource'),
1858
          ),
1859
          Stack(
1860
            children: <Widget>[
1861
              DragTarget<int>(
1862
                builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
1863 1864
                  return const IgnorePointer(
                    child: SizedBox(
1865
                      height: 100.0,
1866
                      child: Text('Target1'),
1867
                    ),
1868 1869
                  );
                },
1870
                onAccept: acceptedInts.add,
1871
                onAcceptWithDetails: acceptedIntsDetails.add,
1872
              ),
1873
              DragTarget<double>(
1874
                builder: (BuildContext context, List<double?> data, List<dynamic> rejects) {
1875 1876
                  return const IgnorePointer(
                    child: SizedBox(
1877
                      height: 100.0,
1878
                      child: Text('Target2'),
1879
                    ),
1880 1881
                  );
                },
1882
                onAccept: acceptedDoubles.add,
1883
                onAcceptWithDetails: acceptedDoublesDetails.add,
1884
              ),
1885 1886 1887 1888
            ],
          ),
        ],
      ),
1889 1890 1891
    ));

    expect(acceptedInts, isEmpty);
1892
    expect(acceptedIntsDetails, isEmpty);
1893
    expect(acceptedDoubles, isEmpty);
1894
    expect(acceptedDoublesDetails, isEmpty);
1895 1896 1897 1898 1899 1900 1901
    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);

1902 1903 1904
    final Offset intLocation = tester.getCenter(find.text('IntSource'));
    final Offset doubleLocation = tester.getCenter(find.text('DoubleSource'));
    final Offset targetLocation = tester.getCenter(find.text('Target1'));
1905 1906

    // Drag the double draggable.
1907
    final TestGesture doubleGesture = await tester.startGesture(doubleLocation, pointer: 7);
1908
    await tester.pump();
1909 1910

    expect(acceptedInts, isEmpty);
1911
    expect(acceptedIntsDetails, isEmpty);
1912
    expect(acceptedDoubles, isEmpty);
1913
    expect(acceptedDoublesDetails, isEmpty);
1914 1915 1916
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsOneWidget);

1917 1918
    await doubleGesture.moveTo(targetLocation);
    await tester.pump();
1919 1920

    expect(acceptedInts, isEmpty);
1921
    expect(acceptedIntsDetails, isEmpty);
1922
    expect(acceptedDoubles, isEmpty);
1923
    expect(acceptedDoublesDetails, isEmpty);
1924 1925 1926
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsOneWidget);

1927 1928
    await doubleGesture.up();
    await tester.pump();
1929 1930

    expect(acceptedInts, isEmpty);
1931
    expect(acceptedIntsDetails, isEmpty);
1932
    expect(acceptedDoubles, equals(<double>[1.0]));
1933 1934
    expect(acceptedDoublesDetails, hasLength(1));
    expect(acceptedDoublesDetails.first.offset, const Offset(112.0, 122.0));
1935 1936 1937 1938
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsNothing);

    acceptedDoubles.clear();
1939
    acceptedDoublesDetails.clear();
1940 1941

    // Drag the int draggable.
1942
    final TestGesture intGesture = await tester.startGesture(intLocation, pointer: 7);
1943
    await tester.pump();
1944 1945

    expect(acceptedInts, isEmpty);
1946
    expect(acceptedIntsDetails, isEmpty);
1947
    expect(acceptedDoubles, isEmpty);
1948
    expect(acceptedDoublesDetails, isEmpty);
1949 1950 1951
    expect(find.text('IntDragging'), findsOneWidget);
    expect(find.text('DoubleDragging'), findsNothing);

1952 1953
    await intGesture.moveTo(targetLocation);
    await tester.pump();
1954 1955

    expect(acceptedInts, isEmpty);
1956
    expect(acceptedIntsDetails, isEmpty);
1957
    expect(acceptedDoubles, isEmpty);
1958
    expect(acceptedDoublesDetails, isEmpty);
1959 1960 1961
    expect(find.text('IntDragging'), findsOneWidget);
    expect(find.text('DoubleDragging'), findsNothing);

1962 1963
    await intGesture.up();
    await tester.pump();
1964 1965

    expect(acceptedInts, equals(<int>[1]));
1966 1967
    expect(acceptedIntsDetails, hasLength(1));
    expect(acceptedIntsDetails.first.offset, const Offset(184.0, 122.0));
1968
    expect(acceptedDoubles, isEmpty);
1969
    expect(acceptedDoublesDetails, isEmpty);
1970 1971 1972
    expect(find.text('IntDragging'), findsNothing);
    expect(find.text('DoubleDragging'), findsNothing);
  });
1973

1974
  testWidgets('Drag and drop - allow pass through of unaccepted data twice test', (WidgetTester tester) async {
1975
    final List<DragTargetData> acceptedDragTargetDatas = <DragTargetData>[];
1976
    final List<DragTargetDetails<DragTargetData>> acceptedDragTargetDataDetails = <DragTargetDetails<DragTargetData>>[];
1977
    final List<ExtendedDragTargetData> acceptedExtendedDragTargetDatas = <ExtendedDragTargetData>[];
1978
    final List<DragTargetDetails<ExtendedDragTargetData>> acceptedExtendedDragTargetDataDetails = <DragTargetDetails<ExtendedDragTargetData>>[];
1979 1980 1981
    final DragTargetData dragTargetData = DragTargetData();
    await tester.pumpWidget(MaterialApp(
      home: Column(
1982
        children: <Widget>[
1983
          Draggable<DragTargetData>(
1984
            data: dragTargetData,
1985
            feedback: const Text('Dragging'),
1986
            child: const Text('Source'),
1987
          ),
1988
          Stack(
1989
            children: <Widget>[
1990
              DragTarget<DragTargetData>(
1991
                builder: (BuildContext context, List<DragTargetData?> data, List<dynamic> rejects) {
1992 1993
                  return const IgnorePointer(
                    child: SizedBox(
1994
                      height: 100.0,
1995
                      child: Text('Target1'),
1996
                    ),
1997
                  );
1998
                }, onAccept: acceptedDragTargetDatas.add,
1999
                onAcceptWithDetails: acceptedDragTargetDataDetails.add,
2000
              ),
2001
              DragTarget<ExtendedDragTargetData>(
2002
                builder: (BuildContext context, List<ExtendedDragTargetData?> data, List<dynamic> rejects) {
2003 2004
                  return const IgnorePointer(
                    child: SizedBox(
2005
                      height: 100.0,
2006
                      child: Text('Target2'),
2007
                    ),
2008 2009
                  );
                },
2010
                onAccept: acceptedExtendedDragTargetDatas.add,
2011
                onAcceptWithDetails: acceptedExtendedDragTargetDataDetails.add,
2012
              ),
2013 2014 2015 2016
            ],
          ),
        ],
      ),
2017
    ));
2018

2019 2020
    final Offset dragTargetLocation = tester.getCenter(find.text('Source'));
    final Offset targetLocation = tester.getCenter(find.text('Target1'));
2021

2022
    for (int i = 0; i < 2; i += 1) {
2023
      final TestGesture gesture = await tester.startGesture(dragTargetLocation);
2024 2025 2026 2027 2028
      await tester.pump();
      await gesture.moveTo(targetLocation);
      await tester.pump();
      await gesture.up();
      await tester.pump();
2029

2030
      expect(acceptedDragTargetDatas, equals(<DragTargetData>[dragTargetData]));
2031 2032
      expect(acceptedDragTargetDataDetails, hasLength(1));
      expect(acceptedDragTargetDataDetails.first.offset, const Offset(256.0, 74.0));
2033
      expect(acceptedExtendedDragTargetDatas, isEmpty);
2034
      expect(acceptedExtendedDragTargetDataDetails, isEmpty);
2035

2036
      acceptedDragTargetDatas.clear();
2037
      acceptedDragTargetDataDetails.clear();
2038
      await tester.pump();
2039
    }
2040
  });
2041

2042
  testWidgets('Drag and drop - maxSimultaneousDrags', (WidgetTester tester) async {
2043
    final List<int> accepted = <int>[];
2044
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
2045 2046

    Widget build(int maxSimultaneousDrags) {
2047 2048
      return MaterialApp(
        home: Column(
2049
          children: <Widget>[
2050
            Draggable<int>(
2051 2052
              data: 1,
              maxSimultaneousDrags: maxSimultaneousDrags,
2053
              feedback: const Text('Dragging'),
2054
              child: const Text('Source'),
2055
            ),
2056
            DragTarget<int>(
2057
              builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2058
                return const SizedBox(height: 100.0, child: Text('Target'));
2059
              },
2060
              onAccept: accepted.add,
2061
              onAcceptWithDetails: acceptedDetails.add,
2062
            ),
2063 2064
          ],
        ),
2065 2066 2067 2068 2069
      );
    }

    await tester.pumpWidget(build(0));

2070 2071
    final Offset firstLocation = tester.getCenter(find.text('Source'));
    final Offset secondLocation = tester.getCenter(find.text('Target'));
2072 2073

    expect(accepted, isEmpty);
2074
    expect(acceptedDetails, isEmpty);
2075 2076 2077 2078
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);

2079
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
2080 2081 2082
    await tester.pump();

    expect(accepted, isEmpty);
2083
    expect(acceptedDetails, isEmpty);
2084 2085 2086 2087 2088 2089 2090 2091 2092
    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);
2093
    expect(acceptedDetails, isEmpty);
2094 2095 2096 2097
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);

2098
    final TestGesture gesture1 = await tester.startGesture(firstLocation, pointer: 8);
2099 2100 2101
    await tester.pump();

    expect(accepted, isEmpty);
2102
    expect(acceptedDetails, isEmpty);
2103 2104 2105 2106
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

2107
    final TestGesture gesture2 = await tester.startGesture(firstLocation, pointer: 9);
2108 2109 2110
    await tester.pump();

    expect(accepted, isEmpty);
2111
    expect(acceptedDetails, isEmpty);
2112 2113 2114 2115
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNWidgets(2));
    expect(find.text('Target'), findsOneWidget);

2116
    final TestGesture gesture3 = await tester.startGesture(firstLocation, pointer: 10);
2117 2118 2119
    await tester.pump();

    expect(accepted, isEmpty);
2120
    expect(acceptedDetails, isEmpty);
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130
    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);
2131
    expect(acceptedDetails, isEmpty);
2132 2133 2134 2135 2136 2137 2138 2139
    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]));
2140 2141
    expect(acceptedDetails, hasLength(1));
    expect(acceptedDetails.first.offset, const Offset(256.0, 74.0));
2142 2143 2144 2145 2146 2147 2148 2149
    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]));
2150 2151 2152
    expect(acceptedDetails, hasLength(2));
    expect(acceptedDetails[0].offset, const Offset(256.0, 74.0));
    expect(acceptedDetails[1].offset, const Offset(256.0, 74.0));
2153 2154 2155 2156 2157 2158 2159 2160
    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]));
2161 2162 2163
    expect(acceptedDetails, hasLength(2));
    expect(acceptedDetails[0].offset, const Offset(256.0, 74.0));
    expect(acceptedDetails[1].offset, const Offset(256.0, 74.0));
2164 2165 2166 2167 2168
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
  });

2169 2170
  testWidgets('Draggable disposes recognizer', (WidgetTester tester) async {
    bool didTap = false;
2171
    await tester.pumpWidget(
2172
      Directionality(
2173
        textDirection: TextDirection.ltr,
2174
        child: Overlay(
2175
          initialEntries: <OverlayEntry>[
2176 2177
            OverlayEntry(
              builder: (BuildContext context) => GestureDetector(
2178 2179 2180
                onTap: () {
                  didTap = true;
                },
2181
                child: Draggable<Object>(
2182
                  feedback: Container(
2183 2184 2185 2186
                    width: 100.0,
                    height: 100.0,
                    color: const Color(0xFFFF0000),
                  ),
2187 2188 2189
                  child: Container(
                    color: const Color(0xFFFFFF00),
                  ),
2190
                ),
2191
              ),
2192 2193 2194 2195 2196
            ),
          ],
        ),
      ),
    );
2197

2198
    await tester.startGesture(const Offset(10.0, 10.0));
2199 2200 2201 2202
    expect(didTap, isFalse);

    // This tears down the draggable without terminating the gesture sequence,
    // which used to trigger asserts in the multi-drag gesture recognizer.
2203
    await tester.pumpWidget(Container(key: UniqueKey()));
2204 2205 2206
    expect(didTap, isFalse);
  });

2207
  // Regression test for https://github.com/flutter/flutter/issues/6128.
2208
  testWidgets('Draggable plays nice with onTap', (WidgetTester tester) async {
2209
    await tester.pumpWidget(
2210
      Directionality(
2211
        textDirection: TextDirection.ltr,
2212
        child: Overlay(
2213
          initialEntries: <OverlayEntry>[
2214 2215
            OverlayEntry(
              builder: (BuildContext context) => GestureDetector(
2216
                onTap: () { /* registers a tap recognizer */ },
2217
                child: Draggable<Object>(
2218
                  feedback: Container(
2219 2220 2221 2222
                    width: 100.0,
                    height: 100.0,
                    color: const Color(0xFFFF0000),
                  ),
2223 2224 2225
                  child: Container(
                    color: const Color(0xFFFFFF00),
                  ),
2226
                ),
2227
              ),
2228 2229 2230 2231 2232
            ),
          ],
        ),
      ),
    );
2233

2234 2235
    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);
2236

2237
    await firstGesture.moveBy(const Offset(100.0, 0.0));
2238 2239
    await secondGesture.up();
  });
2240 2241

  testWidgets('DragTarget does not set state when remove from the tree', (WidgetTester tester) async {
2242
    final List<String> events = <String>[];
2243
    Offset firstLocation, secondLocation;
2244

2245 2246
    await tester.pumpWidget(MaterialApp(
      home: Column(
2247
        children: <Widget>[
2248
          const Draggable<int>(
2249
            data: 1,
2250
            feedback: Text('Dragging'),
2251
            child: Text('Source'),
2252
          ),
2253
          DragTarget<int>(
2254
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2255
              return const Text('Target');
2256
            },
2257
            onAccept: (int? data) {
2258
              events.add('drop');
2259
            },
2260 2261 2262
            onAcceptWithDetails: (DragTargetDetails<int> _) {
              events.add('details');
            },
2263
          ),
2264 2265
        ],
      ),
2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276
    ));

    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'));
2277
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
2278 2279 2280 2281 2282 2283 2284 2285
    await tester.pump();

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

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

2286 2287
    await tester.pumpWidget(MaterialApp(
      home: Column(
2288
        children: const <Widget>[
2289
          Draggable<int>(
2290
            data: 1,
2291
            feedback: Text('Dragging'),
2292
            child: Text('Source'),
2293
          ),
2294 2295
        ],
      ),
2296 2297 2298 2299 2300 2301
    ));

    expect(events, isEmpty);
    await gesture.up();
    await tester.pump();
  });
2302 2303

  testWidgets('Drag and drop - remove draggable', (WidgetTester tester) async {
2304
    final List<int> accepted = <int>[];
2305
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
2306

2307 2308
    await tester.pumpWidget(MaterialApp(
      home: Column(
2309 2310 2311
        children: <Widget>[
          const Draggable<int>(
            data: 1,
2312
            feedback: Text('Dragging'),
2313
            child: Text('Source'),
2314
          ),
2315
          DragTarget<int>(
2316
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2317
              return const SizedBox(height: 100.0, child: Text('Target'));
2318
            },
2319
            onAccept: accepted.add,
2320
            onAcceptWithDetails: acceptedDetails.add,
2321 2322 2323
          ),
        ],
      ),
2324 2325 2326
    ));

    expect(accepted, isEmpty);
2327
    expect(acceptedDetails, isEmpty);
2328 2329 2330 2331
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);

2332
    final Offset firstLocation = tester.getCenter(find.text('Source'));
2333
    final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
2334 2335 2336
    await tester.pump();

    expect(accepted, isEmpty);
2337
    expect(acceptedDetails, isEmpty);
2338 2339 2340 2341
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

2342 2343
    await tester.pumpWidget(MaterialApp(
      home: Column(
2344
        children: <Widget>[
2345
          DragTarget<int>(
2346
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2347
              return const SizedBox(height: 100.0, child: Text('Target'));
2348
            },
2349
            onAccept: accepted.add,
2350
            onAcceptWithDetails: acceptedDetails.add,
2351 2352 2353
          ),
        ],
      ),
2354 2355 2356
    ));

    expect(accepted, isEmpty);
2357
    expect(acceptedDetails, isEmpty);
2358 2359 2360 2361
    expect(find.text('Source'), findsNothing);
    expect(find.text('Dragging'), findsOneWidget);
    expect(find.text('Target'), findsOneWidget);

2362
    final Offset secondLocation = tester.getCenter(find.text('Target'));
2363 2364 2365 2366
    await gesture.moveTo(secondLocation);
    await tester.pump();

    expect(accepted, isEmpty);
2367
    expect(acceptedDetails, isEmpty);
2368 2369 2370 2371 2372 2373 2374 2375
    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]));
2376 2377
    expect(acceptedDetails, hasLength(1));
    expect(acceptedDetails.first.offset, const Offset(256.0, 26.0));
2378 2379 2380 2381 2382
    expect(find.text('Source'), findsNothing);
    expect(find.text('Dragging'), findsNothing);
    expect(find.text('Target'), findsOneWidget);
  });

2383
  testWidgets('Tap above long-press draggable works', (WidgetTester tester) async {
2384
    final List<String> events = <String>[];
2385

2386 2387 2388 2389
    await tester.pumpWidget(MaterialApp(
      home: Material(
        child: Center(
          child: GestureDetector(
2390 2391 2392
            onTap: () {
              events.add('tap');
            },
2393
            child: const LongPressDraggable<int>(
2394 2395
              feedback: Text('Feedback'),
              child: Text('X'),
2396 2397 2398 2399 2400 2401 2402 2403 2404 2405
            ),
          ),
        ),
      ),
    ));

    expect(events, isEmpty);
    await tester.tap(find.text('X'));
    expect(events, equals(<String>['tap']));
  });
2406

2407 2408
  testWidgets('long-press draggable calls onDragEnd called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
2409
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
2410
    bool onDragEndCalled = false;
2411
    late DraggableDetails onDragEndDraggableDetails;
2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422

    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          LongPressDraggable<int>(
            data: 1,
            feedback: const Text('Dragging'),
            onDragEnd: (DraggableDetails details) {
              onDragEndCalled = true;
              onDragEndDraggableDetails = details;
            },
2423
            child: const Text('Source'),
2424 2425
          ),
          DragTarget<int>(
2426
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2427
              return const SizedBox(height: 100.0, child: Text('Target'));
2428
            },
2429
            onAccept: accepted.add,
2430
            onAcceptWithDetails: acceptedDetails.add,
2431 2432 2433 2434 2435 2436
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);
2437
    expect(acceptedDetails, isEmpty);
2438 2439 2440 2441 2442 2443 2444 2445 2446 2447
    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);
2448
    expect(acceptedDetails, isEmpty);
2449 2450 2451 2452 2453 2454 2455 2456
    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);
2457
    expect(acceptedDetails, isEmpty);
2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468
    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);
2469
    expect(acceptedDetails, isEmpty);
2470 2471 2472 2473 2474 2475 2476 2477 2478
    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'));
2479 2480
    final Offset expectedDropOffset = Offset(droppedLocation.dx, secondLocation.dy - firstLocation.dy);

2481
    expect(accepted, equals(<int>[1]));
2482 2483
    expect(acceptedDetails, hasLength(1));
    expect(acceptedDetails.first.offset, expectedDropOffset);
2484 2485 2486 2487 2488 2489 2490
    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));
2491
    expect(onDragEndDraggableDetails.offset, equals(expectedDropOffset));
2492 2493
  });

2494 2495
  testWidgets('long-press draggable calls onDragCompleted called if dropped on accepting target', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
2496
    final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
2497 2498
    bool onDragCompletedCalled = false;

2499 2500
    await tester.pumpWidget(MaterialApp(
      home: Column(
2501
        children: <Widget>[
2502
          LongPressDraggable<int>(
2503 2504 2505 2506 2507
            data: 1,
            feedback: const Text('Dragging'),
            onDragCompleted: () {
              onDragCompletedCalled = true;
            },
2508
            child: const Text('Source'),
2509
          ),
2510
          DragTarget<int>(
2511
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2512
              return const SizedBox(height: 100.0, child: Text('Target'));
2513
            },
2514
            onAccept: accepted.add,
2515
            onAcceptWithDetails: acceptedDetails.add,
2516 2517 2518 2519 2520 2521
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);
2522
    expect(acceptedDetails, isEmpty);
2523 2524 2525 2526 2527 2528 2529 2530 2531 2532
    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);
2533
    expect(acceptedDetails, isEmpty);
2534 2535 2536 2537 2538 2539 2540 2541
    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);
2542
    expect(acceptedDetails, isEmpty);
2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
    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);
2553
    expect(acceptedDetails, isEmpty);
2554 2555 2556 2557 2558 2559 2560 2561 2562
    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]));
2563
    expect(acceptedDetails.first.offset, const Offset(256.0, 74.0));
2564 2565 2566 2567 2568 2569 2570 2571 2572
    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;

2573 2574
    await tester.pumpWidget(MaterialApp(
      home: LongPressDraggable<int>(
2575 2576 2577 2578 2579
        data: 1,
        feedback: const Text('Dragging'),
        onDragStarted: () {
          onDragStartedCalled = true;
        },
2580
        child: const Text('Source'),
2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601
      ),
    ));

    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);
  });
2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612

  testWidgets('Custom long press delay for LongPressDraggable', (WidgetTester tester) async {
    bool onDragStartedCalled = false;
    await tester.pumpWidget(MaterialApp(
      home: LongPressDraggable<int>(
        data: 1,
        delay: const Duration(seconds: 2),
        feedback: const Text('Dragging'),
        onDragStarted: () {
          onDragStartedCalled = true;
        },
2613
        child: const Text('Source'),
2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645
      ),
    ));
    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);
    // Halfway into the long press duration.
    await tester.pump(const Duration(seconds: 1));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(onDragStartedCalled, isFalse);
    // Long press draggable should be showing.
    await tester.pump(const Duration(seconds: 1));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(onDragStartedCalled, isTrue);
  });

  testWidgets('Default long press delay for LongPressDraggable', (WidgetTester tester) async {
    bool onDragStartedCalled = false;
    await tester.pumpWidget(MaterialApp(
      home: LongPressDraggable<int>(
        data: 1,
        feedback: const Text('Dragging'),
        onDragStarted: () {
          onDragStartedCalled = true;
        },
2646
        child: const Text('Source'),
2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668
      ),
    ));
    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);
    // Halfway into the long press duration.
    await tester.pump(const Duration(milliseconds: 250));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsNothing);
    expect(onDragStartedCalled, isFalse);
    // Long press draggable should be showing.
    await tester.pump(const Duration(milliseconds: 250));
    expect(find.text('Source'), findsOneWidget);
    expect(find.text('Dragging'), findsOneWidget);
    expect(onDragStartedCalled, isTrue);
  });
2669

2670 2671 2672 2673 2674 2675 2676 2677
  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);
  });

2678 2679 2680 2681 2682 2683 2684
  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);
  });
2685

2686 2687 2688 2689 2690 2691 2692 2693 2694
  testWidgets('Drag feedback is put on root overlay with [rootOverlay] flag', (WidgetTester tester) async {
      final GlobalKey<NavigatorState> rootNavigatorKey = GlobalKey<NavigatorState>();
      final GlobalKey<NavigatorState> childNavigatorKey = GlobalKey<NavigatorState>();
      // Create a [MaterialApp], with a nested [Navigator], which has the
      // [Draggable].
      await tester.pumpWidget(MaterialApp(
        navigatorKey: rootNavigatorKey,
        home: Column(
          children: <Widget>[
2695
            SizedBox(
2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706
              height: 200.0,
              child: Navigator(
                key: childNavigatorKey,
                onGenerateRoute: (RouteSettings settings) {
                  if (settings.name == '/') {
                    return MaterialPageRoute<void>(
                      settings: settings,
                      builder: (BuildContext context) => const Draggable<int>(
                        data: 1,
                        feedback: Text('Dragging'),
                        rootOverlay: true,
2707
                        child: Text('Source'),
2708 2709 2710 2711 2712 2713 2714 2715
                      ),
                    );
                  }
                  throw UnsupportedError('Unsupported route: $settings');
                },
              ),
            ),
            DragTarget<int>(
2716
              builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2717 2718
                return const SizedBox(
                    height: 300.0, child: Center(child: Text('Target 1')),
2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737
                );
              },
            ),
          ],
        ),
      ));

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

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

      // Expect that the feedback widget is a descendant of the root overlay,
      // but not a descendant of the child overlay.
      expect(
2738 2739 2740 2741 2742 2743
        find.descendant(
          of: find.byType(Overlay).first,
          matching: find.text('Dragging'),
        ),
        findsOneWidget,
      );
2744
      expect(
2745 2746 2747 2748 2749 2750
        find.descendant(
          of: find.byType(Overlay).last,
          matching: find.text('Dragging'),
        ),
        findsNothing,
      );
2751
    });
2752

2753 2754 2755 2756 2757 2758 2759 2760 2761
  // Regression test for https://github.com/flutter/flutter/issues/72483
  testWidgets('Drag and drop - DragTarget<Object> can accept Draggable<int> data', (WidgetTester tester) async {
    final List<Object> accepted = <Object>[];
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          const Draggable<int>(
            data: 1,
            feedback: Text('Dragging'),
2762
            child: Text('Source'),
2763 2764 2765
          ),
          DragTarget<Object>(
            builder: (BuildContext context, List<Object?> data, List<dynamic> rejects) {
2766
              return const SizedBox(height: 100.0, child: Text('Target'));
2767
            },
2768
            onAccept: accepted.add,
2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);

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

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

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

    expect(accepted, equals(<int>[1]));
  });

  testWidgets('Drag and drop - DragTarget<int> can accept Draggable<Object> data when runtime type is int', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          const Draggable<Object>(
            data: 1,
            feedback: Text('Dragging'),
2798
            child: Text('Source'),
2799 2800 2801
          ),
          DragTarget<int>(
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2802
              return const SizedBox(height: 100.0, child: Text('Target'));
2803
            },
2804
            onAccept: accepted.add,
2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);

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

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

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

    expect(accepted, equals(<int>[1]));
  });

  testWidgets('Drag and drop - DragTarget<int> should not accept Draggable<Object> data when runtime type null', (WidgetTester tester) async {
    final List<int> accepted = <int>[];
    bool isReceiveNullDataForCheck = false;
    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          const Draggable<Object>(
            feedback: Text('Dragging'),
2834
            child: Text('Source'),
2835 2836 2837
          ),
          DragTarget<int>(
            builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2838
              return const SizedBox(height: 100.0, child: Text('Target'));
2839
            },
2840
            onAccept: accepted.add,
2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867
            onWillAccept: (int? data) {
              if (data == null)
                isReceiveNullDataForCheck = true;
              return data != null;
            },
          ),
        ],
      ),
    ));

    expect(accepted, isEmpty);

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

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

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

    expect(accepted, isEmpty);
    expect(isReceiveNullDataForCheck, true);
  });

2868
  testWidgets('Drag and drop can contribute semantics', (WidgetTester tester) async {
2869 2870 2871
    final SemanticsTester semantics = SemanticsTester(tester);
    await tester.pumpWidget(MaterialApp(
        home: ListView(
2872
          scrollDirection: Axis.horizontal,
2873
          addSemanticIndexes: false,
2874
          children: <Widget>[
2875
            DragTarget<int>(
2876
              builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
2877 2878 2879
                return const Text('Target');
              },
            ),
2880
            Container(width: 400.0),
2881 2882
            const Draggable<int>(
              data: 1,
2883 2884
              feedback: Text('H'),
              childWhenDragging: SizedBox(),
2885 2886
              axis: Axis.horizontal,
              ignoringFeedbackSemantics: false,
2887
              child: Text('H'),
2888 2889 2890
            ),
            const Draggable<int>(
              data: 2,
2891 2892
              feedback: Text('V'),
              childWhenDragging: SizedBox(),
2893 2894
              axis: Axis.vertical,
              ignoringFeedbackSemantics: false,
2895
              child: Text('V'),
2896 2897 2898
            ),
            const Draggable<int>(
              data: 3,
2899 2900
              feedback: Text('N'),
              childWhenDragging: SizedBox(),
2901
              child: Text('N'),
2902 2903 2904 2905
            ),
          ],
        ),
    ));
2906

2907
    expect(semantics, hasSemantics(
2908
      TestSemantics.root(
2909
        children: <TestSemantics>[
2910
          TestSemantics(
2911 2912 2913
            id: 1,
            textDirection: TextDirection.ltr,
            children: <TestSemantics>[
2914
              TestSemantics(
2915 2916
                id: 2,
                children: <TestSemantics>[
2917
                  TestSemantics(
2918
                    id: 3,
2919
                    flags: <SemanticsFlag>[SemanticsFlag.scopesRoute],
2920
                    children: <TestSemantics>[
2921
                      TestSemantics(
2922
                        id: 4,
2923
                        children: <TestSemantics>[
2924
                          TestSemantics(
2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953
                            id: 9,
                            flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
                            actions: <SemanticsAction>[SemanticsAction.scrollLeft],
                            children: <TestSemantics>[
                              TestSemantics(
                                id: 5,
                                tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                                label: 'Target',
                                textDirection: TextDirection.ltr,
                              ),
                              TestSemantics(
                                id: 6,
                                tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                                label: 'H',
                                textDirection: TextDirection.ltr,
                              ),
                              TestSemantics(
                                id: 7,
                                tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                                label: 'V',
                                textDirection: TextDirection.ltr,
                              ),
                              TestSemantics(
                                id: 8,
                                tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                                label: 'N',
                                textDirection: TextDirection.ltr,
                              ),
                            ],
2954 2955 2956 2957 2958 2959 2960 2961 2962 2963
                          ),
                        ],
                      ),
                    ],
                  ),
                ],
              ),
            ],
          ),
        ],
2964 2965 2966 2967
      ),
      ignoreTransform: true,
      ignoreRect: true,
    ));
2968 2969 2970 2971 2972 2973 2974

    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();
2975

2976
    expect(semantics, hasSemantics(
2977
      TestSemantics.root(
2978
        children: <TestSemantics>[
2979
          TestSemantics(
2980 2981 2982
            id: 1,
            textDirection: TextDirection.ltr,
            children: <TestSemantics>[
2983
              TestSemantics(
2984 2985
                id: 2,
                children: <TestSemantics>[
2986
                  TestSemantics(
2987
                    id: 3,
2988
                    flags: <SemanticsFlag>[SemanticsFlag.scopesRoute],
2989
                    children: <TestSemantics>[
2990
                      TestSemantics(
2991
                        id: 4,
2992
                        children: <TestSemantics>[
2993
                          TestSemantics(
2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016
                            id: 9,
                            flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
                            children: <TestSemantics>[
                              TestSemantics(
                                id: 5,
                                tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                                label: 'Target',
                                textDirection: TextDirection.ltr,
                              ),
                              TestSemantics(
                                id: 6,
                                tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                                label: 'H',
                                textDirection: TextDirection.ltr,
                              ),
                              TestSemantics(
                                id: 7,
                                tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
                                label: 'V',
                                textDirection: TextDirection.ltr,
                              ),
                              /// N is moved offscreen.
                            ],
3017 3018 3019 3020 3021 3022 3023 3024 3025 3026
                          ),
                        ],
                      ),
                    ],
                  ),
                ],
              ),
            ],
          ),
        ],
3027 3028 3029 3030
      ),
      ignoreTransform: true,
      ignoreRect: true,
    ));
3031
    semantics.dispose();
3032
  });
3033

3034 3035 3036 3037 3038 3039 3040 3041 3042 3043
  testWidgets('Drag and drop - when a dragAnchorStrategy is provided it gets called', (WidgetTester tester) async {
    bool dragAnchorStrategyCalled = false;

    await tester.pumpWidget(MaterialApp(
      home: Column(
        children: <Widget>[
          Draggable<int>(
            feedback: const Text('Feedback'),
            dragAnchorStrategy: (Draggable<Object> widget, BuildContext context, Offset position) {
              dragAnchorStrategyCalled = true;
3044
              return Offset.zero;
3045
            },
3046
            child: const Text('Source'),
3047
          ),
3048 3049 3050 3051 3052 3053 3054 3055 3056 3057
        ],
      ),
    ));

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

    expect(dragAnchorStrategyCalled, true);
  });

3058 3059 3060 3061 3062 3063
  testWidgets('configurable Draggable hit test behavior', (WidgetTester tester) async {
    const HitTestBehavior hitTestBehavior = HitTestBehavior.deferToChild;

    await tester.pumpWidget(
      MaterialApp(
        home: Column(
3064
          children: const <Widget>[
3065
            Draggable<int>(
3066 3067
              feedback: SizedBox(height: 50.0, child: Text('Draggable')),
              child: SizedBox(height: 50.0, child: Text('Target')),
3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085
            ),
          ],
        ),
      ),
    );

    expect(tester.widget<Listener>(find.byType(Listener).first).behavior, hitTestBehavior);
  });

  testWidgets('configurable DragTarget hit test behavior', (WidgetTester tester) async {
    const HitTestBehavior hitTestBehavior = HitTestBehavior.deferToChild;

    await tester.pumpWidget(
      MaterialApp(
        home: Column(
          children: <Widget>[
            DragTarget<int>(
              hitTestBehavior: hitTestBehavior,
3086
              builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
3087
                return const SizedBox(height: 100.0, child: Text('Target'));
3088 3089 3090 3091 3092 3093 3094 3095 3096
              },
            ),
          ],
        ),
      ),
    );

    expect(tester.widget<MetaData>(find.byType(MetaData)).behavior, hitTestBehavior);
  });
3097 3098 3099 3100 3101

  testWidgets('LongPressDraggable.dragAnchorStrategy', (WidgetTester tester) async {
    const Widget widget1 = Placeholder(key: ValueKey<int>(1));
    const Widget widget2 = Placeholder(key: ValueKey<int>(2));
    Offset dummyStrategy(Draggable<Object> draggable, BuildContext context, Offset position) => Offset.zero;
3102 3103 3104 3105 3106 3107
    expect(const LongPressDraggable<int>(feedback: widget2, child: widget1), isA<Draggable<int>>());
    expect(const LongPressDraggable<int>(feedback: widget2, child: widget1).child, widget1);
    expect(const LongPressDraggable<int>(feedback: widget2, child: widget1).feedback, widget2);
    expect(const LongPressDraggable<int>(feedback: widget2, child: widget1).dragAnchor, DragAnchor.child);
    expect(const LongPressDraggable<int>(feedback: widget2, dragAnchor: DragAnchor.pointer, child: widget1).dragAnchor, DragAnchor.pointer);
    expect(LongPressDraggable<int>(feedback: widget2, dragAnchorStrategy: dummyStrategy, child: widget1).dragAnchorStrategy, dummyStrategy);
3108
  });
3109 3110
}

3111
Future<void> _testLongPressDraggableHapticFeedback({ required WidgetTester tester, required bool hapticFeedbackOnStart, required int expectedHapticFeedbackCount }) async {
3112 3113 3114
  bool onDragStartedCalled = false;

  int hapticFeedbackCalls = 0;
3115
  tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, (MethodCall methodCall) async {
3116 3117 3118
    if (methodCall.method == 'HapticFeedback.vibrate') {
      hapticFeedbackCalls++;
    }
3119
    return null;
3120 3121
  });

3122 3123
  await tester.pumpWidget(MaterialApp(
    home: LongPressDraggable<int>(
3124 3125 3126 3127 3128 3129
      data: 1,
      feedback: const Text('Dragging'),
      hapticFeedbackOnStart: hapticFeedbackOnStart,
      onDragStarted: () {
        onDragStartedCalled = true;
      },
3130
      child: const Text('Source'),
3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153
    ),
  ));

  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);
}

3154
Future<void> _testChildAnchorFeedbackPosition({ required WidgetTester tester, double top = 0.0, double left = 0.0 }) async {
3155
  final List<int> accepted = <int>[];
3156
  final List<DragTargetDetails<int>> acceptedDetails = <DragTargetDetails<int>>[];
3157 3158
  int dragStartedCount = 0;

3159
  await tester.pumpWidget(
3160
    Stack(
3161 3162
      textDirection: TextDirection.ltr,
      children: <Widget>[
3163
        Positioned(
3164 3165 3166 3167
          left: left,
          top: top,
          right: 0.0,
          bottom: 0.0,
3168 3169
          child: MaterialApp(
            home: Column(
3170
              children: <Widget>[
3171
                Draggable<int>(
3172 3173 3174 3175 3176
                  data: 1,
                  feedback: const Text('Dragging'),
                  onDragStarted: () {
                    ++dragStartedCount;
                  },
3177
                  child: const Text('Source'),
3178
                ),
3179
                DragTarget<int>(
3180
                  builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
3181
                    return const SizedBox(height: 100.0, child: Text('Target'));
3182
                  },
3183
                  onAccept: accepted.add,
3184
                  onAcceptWithDetails: acceptedDetails.add,
3185 3186
                ),
              ],
3187
            ),
3188 3189 3190 3191 3192
          ),
        ),
      ],
    ),
  );
3193 3194

  expect(accepted, isEmpty);
3195
  expect(acceptedDetails, isEmpty);
3196 3197 3198 3199 3200
  expect(find.text('Source'), findsOneWidget);
  expect(find.text('Dragging'), findsNothing);
  expect(find.text('Target'), findsOneWidget);
  expect(dragStartedCount, 0);

3201
  final Offset firstLocation = tester.getCenter(find.text('Source'));
3202
  final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
3203 3204 3205
  await tester.pump();

  expect(accepted, isEmpty);
3206
  expect(acceptedDetails, isEmpty);
3207 3208 3209 3210 3211 3212
  expect(find.text('Source'), findsOneWidget);
  expect(find.text('Dragging'), findsOneWidget);
  expect(find.text('Target'), findsOneWidget);
  expect(dragStartedCount, 1);


3213
  final Offset secondLocation = tester.getBottomRight(find.text('Target'));
3214 3215 3216 3217
  await gesture.moveTo(secondLocation);
  await tester.pump();

  expect(accepted, isEmpty);
3218
  expect(acceptedDetails, isEmpty);
3219 3220 3221 3222 3223
  expect(find.text('Source'), findsOneWidget);
  expect(find.text('Dragging'), findsOneWidget);
  expect(find.text('Target'), findsOneWidget);
  expect(dragStartedCount, 1);

3224 3225
  final Offset feedbackTopLeft = tester.getTopLeft(find.text('Dragging'));
  final Offset sourceTopLeft = tester.getTopLeft(find.text('Source'));
3226
  final Offset dragOffset = secondLocation - firstLocation;
3227
  expect(feedbackTopLeft, equals(sourceTopLeft + dragOffset));
3228 3229
}

3230
class DragTargetData { }
3231

3232
class ExtendedDragTargetData extends DragTargetData { }