1 /*
2  * Copyright (c) 2024 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_TEXT_PICKER_TEXT_PICKER_OVERSCROLL_H
17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_TEXT_PICKER_TEXT_PICKER_OVERSCROLL_H
18 
19 #include "core/components_ng/pattern/pattern.h"
20 #include "core/gestures/velocity_tracker.h"
21 #include "frameworks/base/memory/ace_type.h"
22 
23 namespace OHOS::Ace::NG {
24 
25 class TextPickerOverscroller final {
26 public:
TextPickerOverscroller()27     TextPickerOverscroller() {}
28 
29     bool ApplyCurrentOffset(float yLast, float offsetY, float scrollDelta);
30 
SetColumn(const WeakPtr<Pattern> & value)31     void SetColumn(const WeakPtr<Pattern>& value)
32     {
33         column_ = value;
34     }
35 
SetOverScroll(float overScroll)36     void SetOverScroll(float overScroll)
37     {
38         overScroll_ = overScroll;
39     }
40 
GetOverScroll()41     float GetOverScroll() const
42     {
43         return overScroll_;
44     }
45 
GetBackScroll()46     float GetBackScroll() const
47     {
48         return backScrollOffset_;
49     }
50 
SetStart(float offsetY)51     void SetStart(float offsetY)
52     {
53         overScrollStartOffsetY_ = offsetY;
54     }
55 
56     bool InMaxOverScroll() const;
57     bool IsOverScroll() const;
58     bool IsBackOverScroll() const;
59 
60     void Reset();
61     void UpdateTossSpring(float offsetY);
62     bool ShouldStartRebound();
63 
ResetVelocity()64     void ResetVelocity()
65     {
66         velocityTracker_.Reset();
67     }
68 
SetLoopTossOffset(float offset)69     void SetLoopTossOffset(float offset)
70     {
71         loopTossOffset_ = offset;
72     }
73 
74     RefPtr<Curve> GetReboundCurve() const;
75 
76 private:
77     float GetOverScrollOffset(float yLast, float offsetY) const;
78     bool CanOverScroll(float scrollDelta) const;
79 
80     float height_ = 0.0;
81     float overScroll_ = 0.0;
82     float backScrollOffset_ = 0.0;
83     float deltaScrollOffset_ = 0.0;
84     float overScrollStartOffsetY_ = 0.0;
85     float loopTossOffset_ = 0.0;
86     bool isFirstStart_ = false;
87 
88     WeakPtr<Pattern> column_;
89     VelocityTracker velocityTracker_;
90     ACE_DISALLOW_COPY_AND_MOVE(TextPickerOverscroller);
91 };
92 } // namespace OHOS::Ace::NG
93 
94 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_TEXT_PICKER_TEXT_PICKER_OVERSCROLL_H