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_PATTERN_SCROLL_BAR_SCROLL_BAR_LAYOUT_ALGORITHM_H
17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERN_SCROLL_BAR_SCROLL_BAR_LAYOUT_ALGORITHM_H
18 
19 #include <map>
20 
21 #include "base/geometry/axis.h"
22 #include "base/memory/referenced.h"
23 #include "core/components_ng/layout/layout_algorithm.h"
24 #include "core/components_ng/layout/layout_wrapper.h"
25 
26 namespace OHOS::Ace::NG {
27 
28 class ACE_EXPORT ScrollBarLayoutAlgorithm : public LayoutAlgorithm {
29     DECLARE_ACE_TYPE(ScrollBarLayoutAlgorithm, LayoutAlgorithm);
30 
31 public:
ScrollBarLayoutAlgorithm(float currentOffset)32     explicit ScrollBarLayoutAlgorithm(float currentOffset) : currentOffset_(currentOffset) {}
33     ~ScrollBarLayoutAlgorithm() override = default;
34 
OnReset()35     void OnReset() override {}
36 
GetScrollableDistance()37     float GetScrollableDistance() const
38     {
39         return scrollableDistance_;
40     }
41 
42     void Measure(LayoutWrapper* layoutWrapper) override;
43 
44     void Layout(LayoutWrapper* layoutWrapper) override;
45 
46 private:
47     float currentOffset_ = 0.0f;
48     float scrollableDistance_ = 0.0f;
49 };
50 
51 } // namespace OHOS::Ace::NG
52 
53 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERN_SCROLL_BAR_SCROLL_BAR_LAYOUT_ALGORITHM_H
54