1 /* 2 * Copyright (c) 2024 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_INTERFACES_INNER_API_ACE_KIT_INCLUDE_VIEW_LAYOUT_LAYOUT_ALGORITHM_H 17 #define FOUNDATION_ACE_INTERFACES_INNER_API_ACE_KIT_INCLUDE_VIEW_LAYOUT_LAYOUT_ALGORITHM_H 18 19 #include <functional> 20 #include <optional> 21 22 #include "ui/base/ace_type.h" 23 #include "ui/base/geometry/ng/size_t.h" 24 #include "ui/view/frame_node.h" 25 #include "ui/view/layout/layout_info.h" 26 27 namespace OHOS::Ace::NG { 28 template<class T> 29 struct LayoutConstraintT; 30 } 31 32 namespace OHOS::Ace::Kit { 33 34 class LayoutAlgorithm : public AceType { 35 DECLARE_ACE_TYPE(LayoutAlgorithm, AceType); 36 37 public: LayoutAlgorithm(const WeakPtr<FrameNode> & host)38 explicit LayoutAlgorithm(const WeakPtr<FrameNode>& host) : host_(host) {} 39 virtual ~LayoutAlgorithm() = default; 40 Measure(const Kit::LayoutConstraintInfo & contentConstraint)41 virtual void Measure(const Kit::LayoutConstraintInfo& contentConstraint) {} 42 Layout()43 virtual void Layout() {} 44 MeasureContent(const NG::LayoutConstraintT<float> & contentConstraint)45 virtual std::optional<NG::SizeF> MeasureContent(const NG::LayoutConstraintT<float>& contentConstraint) 46 { 47 return std::nullopt; 48 } 49 SetLayoutConstraint(const Kit::LayoutConstraintInfo & contentConstraint)50 virtual void SetLayoutConstraint(const Kit::LayoutConstraintInfo& contentConstraint) 51 { 52 layoutConstraintInfo_ = contentConstraint; 53 } 54 GetLayoutConstraint()55 virtual const LayoutConstraintInfo& GetLayoutConstraint() const 56 { 57 return layoutConstraintInfo_; 58 } 59 60 protected: 61 WeakPtr<FrameNode> host_; 62 LayoutConstraintInfo layoutConstraintInfo_; 63 }; 64 65 } // namespace OHOS::Ace::Kit 66 67 #endif 68