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_CONTROLLER_H
17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLL_EFFECT_SCROLL_FADE_CONTROLLER_H
18 
19 #include <functional>
20 
21 #include "base/geometry/axis.h"
22 #include "base/thread/cancelable_callback.h"
23 #include "core/animation/animation.h"
24 #include "core/animation/animator.h"
25 #include "core/animation/curve_animation.h"
26 
27 namespace OHOS::Ace::NG {
28 using ScrollOverFunc = std::function<void(double, double)>;
29 
30 enum class OverScrollState {
31     IDLE = 0,
32     ABSORB,
33     PULL,
34     RECEDE,
35 };
36 
37 class ScrollFadeController : public AceType {
38     DECLARE_ACE_TYPE(ScrollFadeController, AceType);
39 
40 public:
41     ScrollFadeController();
42     ~ScrollFadeController();
43     void ProcessAbsorb(double velocity);
44     void ProcessPull(double overDistance, double mainAxisExtent, double crossAxisExtent);
45 
SetCallback(const ScrollOverFunc & callback)46     void SetCallback(const ScrollOverFunc& callback)
47     {
48         callback_ = callback;
49     }
50 
51 protected:
52     void ChangeState();
53     void SchedulePullHoldTask();
54 
55 private:
56     void Initialize();
57     void ProcessRecede(int32_t duration);
58     void DecelerateListener(double value);
59 
60     double opacity_ = 0.0;
61     double opacityFloor_ = 0.0;
62     double opacityCeil_ = 0.0;
63     double scaleSize_ = 0.0;
64     double scaleSizeFloor_ = 0.0;
65     double scaleSizeCeil_ = 0.0;
66     double pullDistance_ = 0.0;
67     OverScrollState state_ = OverScrollState::IDLE;
68     RefPtr<Animator> controller_;
69     RefPtr<Animation<double>> decele_;
70     ScrollOverFunc callback_;
71     CancelableCallback<void()> pullTask_;
72 };
73 } // namespace OHOS::Ace::NG
74 
75 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLL_EFFECT_SCROLL_FADE_CONTROLLER_H
76