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_COMPONENTS_SCROLL_SCROLL_FADE_CONTROLLER_H
17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_SCROLL_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 {
28 
29 using ScrollOverFunc = std::function<void(double, double)>;
30 
31 enum class OverScrollState {
32     IDLE = 0,
33     ABSORB,
34     PULL,
35     RECEDE,
36 };
37 
38 class ScrollFadeController : public AceType {
39     DECLARE_ACE_TYPE(ScrollFadeController, AceType);
40 
41 public:
42     explicit ScrollFadeController(const WeakPtr<PipelineBase>& context);
43     ~ScrollFadeController();
44     void ProcessAbsorb(double velocity);
45     void ProcessPull(double overDistance, double mainAxisExtent, double crossAxisExtent);
46 
SetCallback(const ScrollOverFunc & callback)47     void SetCallback(const ScrollOverFunc& callback)
48     {
49         callback_ = callback;
50     }
51 
52 protected:
53     void ChangeState();
54     void SchedulePullHoldTask();
55 
56 private:
57     void Initialize();
58     void ProcessRecede(int32_t duration);
59     void DecelerateListener(double value);
60 
61     double opacity_ = 0.0;
62     double opacityFloor_ = 0.0;
63     double opacityCeil_ = 0.0;
64     double scaleSize_ = 0.0;
65     double scaleSizeFloor_ = 0.0;
66     double scaleSizeCeil_ = 0.0;
67     double pullDistance_ = 0.0;
68     OverScrollState state_ = OverScrollState::IDLE;
69     RefPtr<Animator> controller_;
70     WeakPtr<PipelineBase> context_;
71     RefPtr<Animation<double>> decele_;
72     ScrollOverFunc callback_;
73     CancelableCallback<void()> pullTask_;
74 };
75 
76 } // namespace OHOS::Ace
77 
78 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_SCROLL_SCROLL_FADE_CONTROLLER_H
79