1 /* 2 * Copyright (c) 2023 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_SCROLLABLE_SCROLLABLE_UTILS_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLLABLE_SCROLLABLE_UTILS_H 18 19 #include "base/geometry/axis.h" 20 #include "core/components_ng/layout/layout_property.h" 21 22 namespace OHOS::Ace::NG { 23 struct ScrollableUtils { 24 /** 25 * @brief Checks if contentHeight needs to expand based on safeArea property. 26 * 27 * @param layoutProps The layout properties to check. 28 * @param axis The scrollable axis. 29 * @return The height expansion amount. 30 */ 31 static float CheckHeightExpansion(const RefPtr<LayoutProperty>& layoutProps, Axis axis); 32 33 /** 34 * @brief Recycle items which are out of boundary. 35 * 36 * @param axis scroll direction 37 * @param offset scroll offset, positive means scroll down, negative means scroll up. 38 * @param start first item index 39 * @param end last item index 40 * @param wrapper layout wrapper 41 */ 42 static void RecycleItemsOutOfBoundary(Axis axis, float offset, int32_t start, int32_t end, LayoutWrapper* wrapper); 43 }; 44 } // namespace OHOS::Ace::NG 45 46 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLLABLE_SCROLLABLE_UTILS_H 47