1 /* 2 * Copyright (c) 2021 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_ANIMATION_SCROLL_MOTION_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_ANIMATION_SCROLL_MOTION_H 18 19 #include "core/animation/friction_motion.h" 20 #include "core/animation/motion.h" 21 #include "core/animation/spring_motion.h" 22 23 namespace OHOS::Ace { 24 25 class ACE_EXPORT ExtentPair { 26 public: ExtentPair(double leading,double trailing)27 ExtentPair(double leading, double trailing) : leading_(leading), trailing_(trailing) {} 28 ExtentPair() = delete; 29 ~ExtentPair() = default; 30 Leading()31 double Leading() const 32 { 33 return leading_; 34 } 35 Trailing()36 double Trailing() const 37 { 38 return trailing_; 39 } 40 41 private: 42 double leading_ = 0.0; 43 double trailing_ = 0.0; 44 }; 45 46 class ACE_EXPORT ScrollMotion : public Motion { 47 public: 48 ScrollMotion(double position, double velocity, const ExtentPair& extent, const ExtentPair& initExtent, 49 const RefPtr<SpringProperty>& spring); 50 ~ScrollMotion() override = default; 51 52 double GetCurrentPosition() override; 53 double GetCurrentVelocity() override; 54 bool IsCompleted() override; 55 56 // Perform motion in each timestamp 57 void Move(float offsetTime) override; 58 59 bool IsValid() const; 60 61 private: MakeUnderScrollMotion(double position,double velocity)62 RefPtr<ScrollSpringMotion> MakeUnderScrollMotion(double position, double velocity) 63 { 64 return AceType::MakeRefPtr<ScrollSpringMotion>(position, leadingExtent_, velocity, spring_); 65 } 66 MakeOverScrollMotion(double position,double velocity)67 RefPtr<ScrollSpringMotion> MakeOverScrollMotion(double position, double velocity) 68 { 69 return AceType::MakeRefPtr<ScrollSpringMotion>(position, trailingExtent_, velocity, spring_); 70 } 71 72 // init position 73 const double position_ { 0.0 }; 74 // init velocity 75 const double velocity_ { 0.0 }; 76 double leadingExtent_ { 0.0 }; 77 double trailingExtent_ { 0.0 }; 78 RefPtr<SpringProperty> spring_; 79 RefPtr<ScrollSpringMotion> springMotion_; 80 }; 81 82 } // namespace OHOS::Ace 83 84 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_ANIMATION_SCROLL_MOTION_H 85