packages/flutter/test/gestures/transformed_long_press_test.dart

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

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('gets local coordinates', (WidgetTester tester) async {
    int longPressCount = 0;
    int longPressUpCount = 0;
    final List<LongPressEndDetails> endDetails = <LongPressEndDetails>[];
    final List<LongPressMoveUpdateDetails> moveDetails = <LongPressMoveUpdateDetails>[];
    final List<LongPressStartDetails> startDetails = <LongPressStartDetails>[];

    final Key redContainer = UniqueKey();
    await tester.pumpWidget(
        Center(
          child: GestureDetector(
              onLongPress: () {
                longPressCount++;
              },
              onLongPressEnd: (LongPressEndDetails details) {
                endDetails.add(details);
              },
              onLongPressMoveUpdate: (LongPressMoveUpdateDetails details) {
                moveDetails.add(details);
              },
              onLongPressStart: (LongPressStartDetails details) {
                startDetails.add(details);
              },
              onLongPressUp: () {
                longPressUpCount++;
              },
              child: Container(
                key: redContainer,
                width: 100,
                height: 150,
                color: Colors.red,
              ),
          ),
        ),
    );

    await tester.longPressAt(tester.getCenter(find.byKey(redContainer)));
    expect(longPressCount, 1);
    expect(longPressUpCount, 1);
    expect(moveDetails, isEmpty);
    expect(startDetails.single.localPosition, const Offset(50, 75));
    expect(startDetails.single.globalPosition, const Offset(400, 300));
    expect(endDetails.single.localPosition, const Offset(50, 75));
    expect(endDetails.single.globalPosition, const Offset(400, 300));
  });

  testWidgets('scaled up', (WidgetTester tester) async {
    int longPressCount = 0;
    int longPressUpCount = 0;
    final List<LongPressEndDetails> endDetails = <LongPressEndDetails>[];
    final List<LongPressMoveUpdateDetails> moveDetails = <LongPressMoveUpdateDetails>[];
    final List<LongPressStartDetails> startDetails = <LongPressStartDetails>[];

    final Key redContainer = UniqueKey();
    await tester.pumpWidget(
        Center(
          child: Transform.scale(
            scale: 2.0,
            child: GestureDetector(
                onLongPress: () {
                  longPressCount++;
                },
                onLongPressEnd: (LongPressEndDetails details) {
                  endDetails.add(details);
                },
                onLongPressMoveUpdate: (LongPressMoveUpdateDetails details) {
                  moveDetails.add(details);
                },
                onLongPressStart: (LongPressStartDetails details) {
                  startDetails.add(details);
                },
                onLongPressUp: () {
                  longPressUpCount++;
                },
                child: Container(
                  key: redContainer,
                  width: 100,
                  height: 150,
                  color: Colors.red,
                ),
            ),
          ),
        ),
    );

    TestGesture gesture = await tester.startGesture(tester.getCenter(find.byKey(redContainer)));
    await gesture.moveBy(const Offset(0, 10.0));
    await tester.pump(kLongPressTimeout);
    await gesture.up();

    expect(longPressCount, 1);
    expect(longPressUpCount, 1);
    expect(startDetails.single.localPosition, const Offset(50, 75));
    expect(startDetails.single.globalPosition, const Offset(400, 300));
    expect(endDetails.single.localPosition, const Offset(50, 75 + 10.0 / 2.0));
    expect(endDetails.single.globalPosition, const Offset(400, 300.0 + 10.0));
    expect(moveDetails, isEmpty); // moved before long press was detected.

    startDetails.clear();
    endDetails.clear();
    longPressCount = 0;
    longPressUpCount = 0;

    // Move after recognized.
    gesture = await tester.startGesture(tester.getCenter(find.byKey(redContainer)));
    await tester.pump(kLongPressTimeout);
    await gesture.moveBy(const Offset(0, 100));
    await gesture.up();

    expect(longPressCount, 1);
    expect(longPressUpCount, 1);
    expect(startDetails.single.localPosition, const Offset(50, 75));
    expect(startDetails.single.globalPosition, const Offset(400, 300));
    expect(endDetails.single.localPosition, const Offset(50, 75 + 100.0 / 2.0));
    expect(endDetails.single.globalPosition, const Offset(400, 300.0 + 100.0));
    expect(moveDetails.single.localPosition, const Offset(50, 75 + 100.0 / 2.0));
    expect(moveDetails.single.globalPosition, const Offset(400, 300.0 + 100.0));
    expect(moveDetails.single.offsetFromOrigin, const Offset(0, 100.0));
    expect(moveDetails.single.localOffsetFromOrigin, const Offset(0, 100.0 / 2.0));
  });

  testWidgets('scaled down', (WidgetTester tester) async {
    int longPressCount = 0;
    int longPressUpCount = 0;
    final List<LongPressEndDetails> endDetails = <LongPressEndDetails>[];
    final List<LongPressMoveUpdateDetails> moveDetails = <LongPressMoveUpdateDetails>[];
    final List<LongPressStartDetails> startDetails = <LongPressStartDetails>[];

    final Key redContainer = UniqueKey();
    await tester.pumpWidget(
        Center(
          child: Transform.scale(
            scale: 0.5,
            child: GestureDetector(
                onLongPress: () {
                  longPressCount++;
                },
                onLongPressEnd: (LongPressEndDetails details) {
                  endDetails.add(details);
                },
                onLongPressMoveUpdate: (LongPressMoveUpdateDetails details) {
                  moveDetails.add(details);
                },
                onLongPressStart: (LongPressStartDetails details) {
                  startDetails.add(details);
                },
                onLongPressUp: () {
                  longPressUpCount++;
                },
                child: Container(
                  key: redContainer,
                  width: 100,
                  height: 150,
                  color: Colors.red,
                ),
            ),
          ),
        ),
    );

    TestGesture gesture = await tester.startGesture(tester.getCenter(find.byKey(redContainer)));
    await gesture.moveBy(const Offset(0, 10.0));
    await tester.pump(kLongPressTimeout);
    await gesture.up();

    expect(longPressCount, 1);
    expect(longPressUpCount, 1);
    expect(startDetails.single.localPosition, const Offset(50, 75));
    expect(startDetails.single.globalPosition, const Offset(400, 300));
    expect(endDetails.single.localPosition, const Offset(50, 75 + 10.0 * 2.0));
    expect(endDetails.single.globalPosition, const Offset(400, 300.0 + 10.0));
    expect(moveDetails, isEmpty); // moved before long press was detected.

    startDetails.clear();
    endDetails.clear();
    longPressCount = 0;
    longPressUpCount = 0;

    // Move after recognized.
    gesture = await tester.startGesture(tester.getCenter(find.byKey(redContainer)));
    await tester.pump(kLongPressTimeout);
    await gesture.moveBy(const Offset(0, 100));
    await gesture.up();

    expect(longPressCount, 1);
    expect(longPressUpCount, 1);
    expect(startDetails.single.localPosition, const Offset(50, 75));
    expect(startDetails.single.globalPosition, const Offset(400, 300));
    expect(endDetails.single.localPosition, const Offset(50, 75 + 100.0 * 2.0));
    expect(endDetails.single.globalPosition, const Offset(400, 300.0 + 100.0));
    expect(moveDetails.single.localPosition, const Offset(50, 75 + 100.0 * 2.0));
    expect(moveDetails.single.globalPosition, const Offset(400, 300.0 + 100.0));
    expect(moveDetails.single.offsetFromOrigin, const Offset(0, 100.0));
    expect(moveDetails.single.localOffsetFromOrigin, const Offset(0, 100.0 * 2.0));
  });
}