1 /* 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLL_EFFECT_SCROLL_FADE_EFFECT_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLL_EFFECT_SCROLL_FADE_EFFECT_H 18 19 #include "base/utils/macros.h" 20 #include "core/components_ng/pattern/scroll/scroll_edge_effect.h" 21 #include "core/components_ng/pattern/scroll/effect/scroll_fade_controller.h" 22 #include "core/components_ng/pattern/scroll/effect/scroll_fade_painter.h" 23 24 namespace OHOS::Ace::NG { 25 constexpr float SCALE_THRESHOLD = 0.3f; 26 constexpr float OVER_SCROLL_THRESHOLD = 2.0f; 27 28 class ACE_EXPORT ScrollFadeEffect final : public ScrollEdgeEffect { 29 DECLARE_ACE_TYPE(ScrollFadeEffect, ScrollEdgeEffect); 30 31 public: 32 explicit ScrollFadeEffect(const Color& color = Color::GRAY) 33 : ScrollEdgeEffect(EdgeEffect::FADE), fadeColor_(color) {} 34 ~ScrollFadeEffect() override = default; 35 GetFadeColor()36 const Color& GetFadeColor() const 37 { 38 return fadeColor_; 39 } 40 41 void InitialEdgeEffect() override; 42 double CalculateOverScroll(double oldPosition, bool isReachMax) override; 43 void Paint(RSCanvas& canvas, const SizeF& viewPort, const OffsetF& offset) override; 44 void HandleOverScroll(Axis axis, float overScroll, const SizeF& viewPort, 45 bool isScrollFromUpdate = false, bool isNotPositiveScrollableDistance = false) override; 46 void SetHandleOverScrollCallback(const HandleOverScrollCallback& callback) override; 47 48 private: 49 void ResetFadeEffect(const Color& color); 50 void SetOpacityAndScale(float opacity, float scale); 51 void SetPaintDirection(Axis axis, float overScroll, bool isNotPositiveScrollableDistance); 52 53 Color fadeColor_ = Color::GRAY; 54 RefPtr<ScrollFadePainter> fadePainter_; 55 RefPtr<ScrollFadeController> fadeController_; 56 HandleOverScrollCallback handleOverScrollCallback_ = nullptr; 57 }; 58 } // namespace OHOS::Ace::NG 59 60 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLL_EFFECT_SCROLL_FADE_EFFECT_H 61