packages/flutter/test/gestures/double_tap_test.dart

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/gestures.dart';
import 'package:quiver/testing/async.dart';

import '../flutter_test_alternative.dart';
import 'gesture_tester.dart';

class TestGestureArenaMember extends GestureArenaMember {
  @override
  void acceptGesture(int key) {
    accepted = true;
  }

  @override
  void rejectGesture(int key) {
    rejected = true;
  }

  bool accepted = false;
  bool rejected = false;
}

void main() {
  setUp(ensureGestureBinding);

  // Down/up pair 1: normal tap sequence
  const PointerDownEvent down1 = PointerDownEvent(
    pointer: 1,
    position: Offset(10.0, 10.0)
  );

  const PointerUpEvent up1 = PointerUpEvent(
    pointer: 1,
    position: Offset(11.0, 9.0)
  );

  // Down/up pair 2: normal tap sequence close to pair 1
  const PointerDownEvent down2 = PointerDownEvent(
    pointer: 2,
    position: Offset(12.0, 12.0)
  );

  const PointerUpEvent up2 = PointerUpEvent(
    pointer: 2,
    position: Offset(13.0, 11.0)
  );

  // Down/up pair 3: normal tap sequence far away from pair 1
  const PointerDownEvent down3 = PointerDownEvent(
    pointer: 3,
    position: Offset(130.0, 130.0)
  );

  const PointerUpEvent up3 = PointerUpEvent(
    pointer: 3,
    position: Offset(131.0, 129.0)
  );

  // Down/move/up sequence 4: intervening motion
  const PointerDownEvent down4 = PointerDownEvent(
    pointer: 4,
    position: Offset(10.0, 10.0)
  );

  const PointerMoveEvent move4 = PointerMoveEvent(
    pointer: 4,
    position: Offset(25.0, 25.0)
  );

  const PointerUpEvent up4 = PointerUpEvent(
    pointer: 4,
    position: Offset(25.0, 25.0)
  );

  // Down/up pair 5: normal tap sequence identical to pair 1 with different pointer
  const PointerDownEvent down5 = PointerDownEvent(
    pointer: 5,
    position: Offset(10.0, 10.0)
  );

  const PointerUpEvent up5 = PointerUpEvent(
    pointer: 5,
    position: Offset(11.0, 9.0)
  );

  testGesture('Should recognize double tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down2);
    expect(doubleTapRecognized, isFalse);

    tester.route(up2);
    expect(doubleTapRecognized, isTrue);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isTrue);

    tap.dispose();
  });

  testGesture('Inter-tap distance cancels double tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down3);
    tester.closeArena(3);
    expect(doubleTapRecognized, isFalse);
    tester.route(down3);
    expect(doubleTapRecognized, isFalse);

    tester.route(up3);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(3);
    expect(doubleTapRecognized, isFalse);

    tap.dispose();
  });

  testGesture('Intra-tap distance cancels double tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down4);
    tester.closeArena(4);
    expect(doubleTapRecognized, isFalse);
    tester.route(down4);
    expect(doubleTapRecognized, isFalse);

    tester.route(move4);
    expect(doubleTapRecognized, isFalse);
    tester.route(up4);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(4);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down2);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tap.dispose();
  });

  testGesture('Inter-tap delay cancels double tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tester.async.elapse(const Duration(milliseconds: 5000));
    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down2);
    expect(doubleTapRecognized, isFalse);

    tester.route(up2);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isFalse);

    tap.dispose();
  });

  testGesture('Inter-tap delay resets double tap, allowing third tap to be a double-tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tester.async.elapse(const Duration(milliseconds: 5000));
    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down2);
    expect(doubleTapRecognized, isFalse);

    tester.route(up2);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isFalse);

    tester.async.elapse(const Duration(milliseconds: 100));
    tap.addPointer(down5);
    tester.closeArena(5);
    expect(doubleTapRecognized, isFalse);
    tester.route(down5);
    expect(doubleTapRecognized, isFalse);

    tester.route(up5);
    expect(doubleTapRecognized, isTrue);
    GestureBinding.instance.gestureArena.sweep(5);
    expect(doubleTapRecognized, isTrue);

    tap.dispose();
  });

  testGesture('Intra-tap delay does not cancel double tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.async.elapse(const Duration(milliseconds: 1000));
    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down2);
    expect(doubleTapRecognized, isFalse);

    tester.route(up2);
    expect(doubleTapRecognized, isTrue);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isTrue);

    tap.dispose();
  });

  testGesture('Should not recognize two overlapping taps', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up2);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isFalse);

    tap.dispose();
  });

  testGesture('Should recognize one tap of group followed by second tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up2);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down1);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isTrue);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isTrue);

    tap.dispose();

  });

  testGesture('Should cancel on arena reject during first tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    final TestGestureArenaMember member = TestGestureArenaMember();
    final GestureArenaEntry entry = GestureBinding.instance.gestureArena.add(1, member);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    entry.resolve(GestureDisposition.accepted);
    expect(member.accepted, isTrue);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down2);
    expect(doubleTapRecognized, isFalse);

    tester.route(up2);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isFalse);

    tap.dispose();
  });

  testGesture('Should cancel on arena reject between taps', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    final TestGestureArenaMember member = TestGestureArenaMember();
    final GestureArenaEntry entry = GestureBinding.instance.gestureArena.add(1, member);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    entry.resolve(GestureDisposition.accepted);
    expect(member.accepted, isTrue);

    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down2);
    expect(doubleTapRecognized, isFalse);

    tester.route(up2);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isFalse);

    tap.dispose();
  });

  testGesture('Should cancel on arena reject during last tap', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    tap.addPointer(down1);
    final TestGestureArenaMember member = TestGestureArenaMember();
    final GestureArenaEntry entry = GestureBinding.instance.gestureArena.add(1, member);
    tester.closeArena(1);
    expect(doubleTapRecognized, isFalse);
    tester.route(down1);
    expect(doubleTapRecognized, isFalse);

    tester.route(up1);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(1);
    expect(doubleTapRecognized, isFalse);

    tap.addPointer(down2);
    tester.closeArena(2);
    expect(doubleTapRecognized, isFalse);
    tester.route(down2);
    expect(doubleTapRecognized, isFalse);

    entry.resolve(GestureDisposition.accepted);
    expect(member.accepted, isTrue);

    tester.route(up2);
    expect(doubleTapRecognized, isFalse);
    GestureBinding.instance.gestureArena.sweep(2);
    expect(doubleTapRecognized, isFalse);

    tap.dispose();
  });

  testGesture('Passive gesture should trigger on double tap cancel', (GestureTester tester) {
    final DoubleTapGestureRecognizer tap = DoubleTapGestureRecognizer();

    bool doubleTapRecognized = false;
    tap.onDoubleTap = () {
      doubleTapRecognized = true;
    };

    FakeAsync().run((FakeAsync async) {
      tap.addPointer(down1);
      final TestGestureArenaMember member = TestGestureArenaMember();
      GestureBinding.instance.gestureArena.add(1, member);
      tester.closeArena(1);
      expect(doubleTapRecognized, isFalse);
      tester.route(down1);
      expect(doubleTapRecognized, isFalse);

      tester.route(up1);
      expect(doubleTapRecognized, isFalse);
      GestureBinding.instance.gestureArena.sweep(1);
      expect(doubleTapRecognized, isFalse);

      expect(member.accepted, isFalse);

      async.elapse(const Duration(milliseconds: 5000));

      expect(member.accepted, isTrue);
    });

    tap.dispose();
  });

}