chromium/third_party/blink/renderer/platform/widget/input/elastic_overscroll_controller_bezier_unittest.cc

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "third_party/blink/renderer/platform/widget/input/elastic_overscroll_controller_bezier.h"

#include "build/build_config.h"
#include "cc/input/input_handler.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/common/input/web_input_event.h"
#include "third_party/blink/public/common/input/web_mouse_wheel_event.h"
#include "ui/gfx/geometry/vector2d_conversions.h"

namespace blink {

Size;
Vector2dF;
PhaseState;

class MockScrollElasticityHelper : public cc::ScrollElasticityHelper { … };

class ElasticOverscrollControllerBezierTest : public testing::Test { … };

// Tests that the scroller "stretches" as expected when an overscroll occurs
// on a non-scrollable area. See ReconcileStretchAndScroll for an overscroll
// stretch on scrollable areas.
TEST_F(ElasticOverscrollControllerBezierTest, OverscrollStretch) { … }

// Verify that synthetic gesture events do not trigger an overscroll.
TEST_F(ElasticOverscrollControllerBezierTest, NoSyntheticEventsOverscroll) { … }

// Verify that ReconcileStretchAndScroll reduces the overscrolled delta.
TEST_F(ElasticOverscrollControllerBezierTest, ReconcileStretchAndScroll) { … }

// Tests that momentum_animation_start_time_ doesn't get reset when the
// overscroll animation is ticking and the scroller is diagonally overscrolled.
TEST_F(ElasticOverscrollControllerBezierTest, VerifyInitialStretchDelta) { … }

// Tests if the overscrolled delta maps correctly to the actual amount that the
// scroller gets stretched.
TEST_F(ElasticOverscrollControllerBezierTest, VerifyOverscrollBounceDistance) { … }

// Tests that the bounce back animation ticks as expected. If the animation was
// successfully created, the call to OverscrollBounceController::Animate should
// tick the animation as expected. When the stretch amount is near 0, the
// scroller should treat the bounce as "completed".
TEST_F(ElasticOverscrollControllerBezierTest, VerifyBackwardAnimationTick) { … }

// Tests that the bounce forward animation ticks as expected.
TEST_F(ElasticOverscrollControllerBezierTest, VerifyForwardAnimationTick) { … }

// Tests that the bounce forward animation is *not* played when the velocity is
// less than kIgnoreForwardBounceVelocityThreshold. This can be verified by
// checking bounce_forwards_distance_ (since it is a function of velocity)
TEST_F(ElasticOverscrollControllerBezierTest,
       VerifyForwardAnimationIsNotPlayed) { … }

// Tests initiating a scroll when a bounce back animation is in progress works
// as expected.
TEST_F(ElasticOverscrollControllerBezierTest, VerifyScrollDuringBounceBack) { … }

// Tests that animation doesn't get created when unused_delta is 0.
TEST_F(ElasticOverscrollControllerBezierTest, VerifyAnimationNotCreated) { … }
}  // namespace blink