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_LIST_LIST_LAYOUT_MANAGER_H
17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_LIST_LIST_LAYOUT_MANAGER_H
18 
19 #include <functional>
20 #include <vector>
21 
22 #include "core/animation/bilateral_spring_adapter.h"
23 #include "core/animation/simple_spring_chain.h"
24 #include "core/components/common/layout/constants.h"
25 #include "core/components/list/layout_manager.h"
26 #include "core/components/list/render_list.h"
27 #include "core/components/scroll/scrollable.h"
28 
29 namespace OHOS::Ace {
30 
31 class ListLayoutManager : public LayoutManager {
32     DECLARE_ACE_TYPE(ListLayoutManager, LayoutManager);
33 
34 public:
35     explicit ListLayoutManager(RenderList& renderList);
36 
37     ~ListLayoutManager() override = default;
38 
39     void Update() override;
40 
41     void PerformLayout() override;
42 
43     void RefreshLayout() override;
44 
45     void MoveItemToViewPort(double position) override;
46 
47     void MoveItemGroupToViewPort(double position, double size) override;
48 
49     int32_t focusMove(KeyDirection direction) override;
50 
51     void CalculateFocusIndexPosition() override;
52 
53     void LayoutToItem(int32_t toIndex) override;
54 
55     void LayoutToPosition(double position) override;
56 
57     void LayoutMore(double incDistance) override;
58 
59     void NotifyNeedRefresh() override;
60 
AdjustLayoutSize(double size)61     virtual double AdjustLayoutSize(double size)
62     {
63         return size;
64     }
65 
66     double FlushChainAnimation() override;
67 
68     double GetItemAnimationValue(int32_t index) const override;
69 
70 protected:
71     virtual void SetChildPosition(const RefPtr<RenderNode>& child, int32_t index, double mainSize);
72     RenderList& renderList_;
73 
74     LayoutParam MakeInnerLayoutParam(FlexAlign selfAlign) const;
75     LayoutParam AdjustLayoutParam(const RefPtr<RenderNode> child, LayoutParam param);
76     void RequestMoreItemsIfNeeded(int32_t viewBegin, int32_t viewEnd) override;
77     void UpdateItemGroupAttr(RefPtr<RenderNode>& itemChild);
78     void ShowItemFocusAnimation();
79     void AnimationForItemUpdate();
80 
81 private:
82     void CalculateCachedRange(int32_t viewBegin, int32_t viewEnd, int32_t cachedCount, int32_t& cachedBegin,
83         int32_t& cachedEnd) override;
84     bool CalculateStartPosition(double& start);
85     bool CheckNeedAnimation();
86     void InitChainAnimation(int32_t nodeCount);
87     double GetChainDelta(int32_t index) const;
88     void UpdateItemPosition(void);
89     void UpdateMaxEndOffset(int32_t index, double curMainSize);
90 
91     int32_t maxEndIndex_ = LIST_PARAM_INVAID;
92     double maxEndOffset_ = 0.0;
93 
94     int32_t cachedCount_ = 1;
95     int32_t maxCount_ = 0;
96     double mainOffset_ = -1.0;
97     double controlValue_ = 0.0;
98     bool chainOverScroll_ = false;
99     double chainOffset_ = 0.0;
100     RefPtr<BilateralSpringAdapter> chainAdapter_;
101     RefPtr<SimpleSpringChain> chain_;
102 };
103 
104 } // namespace OHOS::Ace
105 
106 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_LIST_LIST_LAYOUT_MANAGER_H
107