| // 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_EXPONENTIAL_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_ELASTIC_OVERSCROLL_CONTROLLER_EXPONENTIAL_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" |
| |
| namespace blink { |
| // Manages scroller stretch and rebounds when overscrolling. This controller |
| // uses an Exponential curve. |
| class PLATFORM_EXPORT ElasticOverscrollControllerExponential |
| : public ElasticOverscrollController { |
| public: |
| explicit ElasticOverscrollControllerExponential( |
| cc::ScrollElasticityHelper* helper); |
| ~ElasticOverscrollControllerExponential() 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; |
| DISALLOW_COPY_AND_ASSIGN(ElasticOverscrollControllerExponential); |
| }; |
| |
| } // namespace blink |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_ELASTIC_OVERSCROLL_CONTROLLER_EXPONENTIAL_H_ |
