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// Copyright 2020 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_ELASTIC_OVERSCROLL_CONTROLLER_BEZIER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_ELASTIC_OVERSCROLL_CONTROLLER_BEZIER_H_
#include "base/macros.h"
#include "cc/input/scroll_elasticity_helper.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/widget/input/elastic_overscroll_controller.h"
#include "ui/gfx/geometry/cubic_bezier.h"
#include "base/memory/ptr_util.h"
#include "base/time/time.h"
#include "third_party/blink/public/platform/web_common.h"
namespace blink {
// Manages scroller stretch and rebounds when overscrolling. This controller
// uses a Bezier curve.
class PLATFORM_EXPORT ElasticOverscrollControllerBezier
: public ElasticOverscrollController {
public:
explicit ElasticOverscrollControllerBezier(
cc::ScrollElasticityHelper* helper);
~ElasticOverscrollControllerBezier() override = default;
void DidEnterMomentumAnimatedState() override;
gfx::Vector2d StretchAmountForTimeDelta(
const base::TimeDelta& delta) const override;
gfx::Vector2d StretchAmountForAccumulatedOverscroll(
const gfx::Vector2dF& accumulated_overscroll) const override;
gfx::Vector2d AccumulatedOverscrollForStretchAmount(
const gfx::Vector2dF& delta) const override;
gfx::Vector2dF OverscrollBoundary(const gfx::Size& scroller_bounds) const;
double StretchAmountForForwardBounce(
const gfx::CubicBezier bounce_forwards_curve,
const base::TimeDelta& delta,
const base::TimeDelta& bounce_forwards_duration,
const double velocity,
const double initial_stretch,
const double bounce_forwards_distance) const;
double StretchAmountForBackwardBounce(
const gfx::CubicBezier bounce_backwards_curve,
const base::TimeDelta& delta,
const base::TimeDelta& bounce_backwards_duration,
const double bounce_forwards_distance) const;
private:
FRIEND_TEST_ALL_PREFIXES(ElasticOverscrollControllerBezierTest,
VerifyInitialStretchDelta);
FRIEND_TEST_ALL_PREFIXES(ElasticOverscrollControllerBezierTest,
VerifyForwardAnimationIsNotPlayed);
// This is the velocity (in px/ms) of the fling at the moment the scroller
// reaches its bounds. This is useful to tweak the Cubic Bezier curve for the
// bounce animation that is about to get played.
gfx::Vector2dF residual_velocity_;
base::TimeDelta bounce_forwards_duration_x_;
base::TimeDelta bounce_forwards_duration_y_;
gfx::Vector2dF bounce_forwards_distance_;
base::TimeDelta bounce_backwards_duration_x_;
base::TimeDelta bounce_backwards_duration_y_;
DISALLOW_COPY_AND_ASSIGN(ElasticOverscrollControllerBezier);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_ELASTIC_OVERSCROLL_CONTROLLER_BEZIER_H_
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