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