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_CUSTOM_CUSTOM_NODE_LAYOUT_ALGORITHM_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERN_CUSTOM_CUSTOM_NODE_LAYOUT_ALGORITHM_H 18 19 #include <optional> 20 #include <string> 21 22 #include "base/utils/noncopyable.h" 23 #include "core/components_ng/base/ui_node.h" 24 #include "core/components_ng/layout/box_layout_algorithm.h" 25 #include "core/components_ng/layout/layout_algorithm.h" 26 #include "core/components_ng/layout/layout_wrapper.h" 27 #include "core/components_ng/pattern/custom/custom_measure_layout_param.h" 28 29 namespace OHOS::Ace::NG { 30 31 using RenderFunction = std::function<RefPtr<UINode>()>; 32 33 // CustomNodeLayoutAlgorithm acts as the underlying @component view. 34 class ACE_EXPORT CustomNodeLayoutAlgorithm : public BoxLayoutAlgorithm { 35 DECLARE_ACE_TYPE(CustomNodeLayoutAlgorithm, BoxLayoutAlgorithm); 36 37 public: CustomNodeLayoutAlgorithm(const RenderFunction & renderFunction)38 explicit CustomNodeLayoutAlgorithm(const RenderFunction& renderFunction) : renderFunction_(renderFunction) {} 39 40 ~CustomNodeLayoutAlgorithm() override = default; 41 OnReset()42 void OnReset() override 43 { 44 renderFunction_ = nullptr; 45 } 46 47 void Measure(LayoutWrapper* layoutWrapper) override; 48 49 void Layout(LayoutWrapper* layoutWrapper) override; 50 MeasureContent(const LayoutConstraintF &,LayoutWrapper *)51 std::optional<SizeF> MeasureContent( 52 const LayoutConstraintF& /*contentConstraint*/, LayoutWrapper* /*layoutWrapper*/) override 53 { 54 return std::nullopt; 55 } 56 MoveBuildItem()57 RefPtr<UINode> MoveBuildItem() 58 { 59 return std::move(buildItem_); 60 } 61 GetMeasureLayoutParam()62 RefPtr<MeasureLayoutParam> GetMeasureLayoutParam() 63 { 64 return children_; 65 } 66 67 private: 68 RenderFunction renderFunction_; 69 RefPtr<MeasureLayoutParam> children_; 70 71 RefPtr<UINode> buildItem_; 72 73 ACE_DISALLOW_COPY_AND_MOVE(CustomNodeLayoutAlgorithm); 74 }; 75 } // namespace OHOS::Ace::NG 76 77 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERN_CUSTOM_CUSTOM_NODE_LAYOUT_ALGORITHM_H 78