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_FLEX_FLEX_LAYOUT_ALGORITHM_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERN_FLEX_FLEX_LAYOUT_ALGORITHM_H 18 19 #include "core/components/common/layout/constants.h" 20 #include "core/components_ng/layout/layout_algorithm.h" 21 #include "core/components_ng/layout/layout_wrapper.h" 22 #include "core/components_ng/pattern/flex/flex_layout_styles.h" 23 24 namespace OHOS::Ace::NG { 25 26 struct FlexItemProperties { 27 float totalShrink = 0.0f; 28 float totalGrow = 0.0f; 29 RefPtr<LayoutWrapper> lastShrinkChild; 30 RefPtr<LayoutWrapper> lastGrowChild; 31 }; 32 33 struct MagicLayoutNode { 34 LayoutConstraintF layoutConstraint; 35 RefPtr<LayoutWrapper> layoutWrapper; 36 OptionalSizeF calcSize; 37 }; 38 39 struct BaselineProperties { 40 float maxBaselineDistance = 0.0f; 41 float maxDistanceAboveBaseline = 0.0f; 42 float maxDistanceBelowBaseline = 0.0f; 43 ResetBaselineProperties44 void Reset() 45 { 46 maxBaselineDistance = 0.0f; 47 maxDistanceAboveBaseline = 0.0f; 48 maxDistanceBelowBaseline = 0.0f; 49 } 50 }; 51 52 class ACE_EXPORT FlexLayoutAlgorithm : public LayoutAlgorithm { 53 DECLARE_ACE_TYPE(FlexLayoutAlgorithm, LayoutAlgorithm); 54 55 public: 56 FlexLayoutAlgorithm() = default; 57 ~FlexLayoutAlgorithm() override = default; 58 59 void Measure(LayoutWrapper* layoutWrapper) override; 60 61 void Layout(LayoutWrapper* layoutWrapper) override; 62 SetLinearLayoutFeature()63 void SetLinearLayoutFeature() 64 { 65 isLinearLayoutFeature_ = true; 66 } 67 68 private: 69 void InitFlexProperties(LayoutWrapper* layoutWrapper); 70 void TravelChildrenFlexProps(LayoutWrapper* layoutWrapper, const SizeF& realSize); 71 void UpdateAllocatedSize(const RefPtr<LayoutWrapper>& layoutWrapper, float& crossAxisSize); 72 float GetChildMainAxisSize(const RefPtr<LayoutWrapper>& layoutWrapper) const; 73 float GetChildCrossAxisSize(const RefPtr<LayoutWrapper>& layoutWrapper) const; 74 float GetSelfCrossAxisSize(const RefPtr<LayoutWrapper>& layoutWrapper) const; 75 void CheckSizeValidity(const RefPtr<LayoutWrapper>& layoutWrapper); 76 void CheckBaselineProperties(const RefPtr<LayoutWrapper>& layoutWrapper); 77 void CalculateSpace(float remainSpace, float& frontSpace, float& betweenSpace) const; 78 void PlaceChildren( 79 LayoutWrapper* layoutWrapper, float frontSpace, float betweenSpace, const OffsetF& paddingOffset); 80 FlexAlign GetSelfAlign(const RefPtr<LayoutWrapper>& layoutWrapper) const; 81 float GetStretchCrossAxisLimit() const; 82 void MeasureOutOfLayoutChildren(LayoutWrapper* layoutWrapper); 83 void MeasureAndCleanMagicNodes(FlexItemProperties& flexItemProperties); 84 void SecondaryMeasureByProperty(FlexItemProperties& flexItemProperties, LayoutWrapper* layoutWrapper); 85 void UpdateLayoutConstraintOnMainAxis(LayoutConstraintF& layoutConstraint, float size); 86 void UpdateLayoutConstraintOnCrossAxis(LayoutConstraintF& layoutConstraint, float size); 87 void AdjustTotalAllocatedSize(LayoutWrapper* layoutWrapper); 88 89 OptionalSizeF realSize_; 90 float mainAxisSize_ = 0.0f; 91 float crossAxisSize_ = 0.0f; 92 float selfIdealCrossAxisSize_ = -1.0f; 93 float allocatedSize_ = 0.0f; 94 float space_ = 0.0f; 95 float totalFlexWeight_ = 0.0f; 96 int32_t maxDisplayPriority_ = 0; 97 int32_t validSizeCount_ = 0; 98 FlexAlign crossAxisAlign_ = FlexAlign::FLEX_START; 99 FlexAlign mainAxisAlign_ = FlexAlign::FLEX_START; 100 101 std::map<int32_t, std::list<MagicLayoutNode>> magicNodes_; 102 std::map<int32_t, float> magicNodeWeights_; 103 std::list<MagicLayoutNode> secondaryMeasureList_; 104 std::list<RefPtr<LayoutWrapper>> outOfLayoutChildren_; 105 106 FlexDirection direction_ = FlexDirection::ROW; 107 friend class LinearLayoutUtils; 108 BaselineProperties baselineProperties_; 109 bool isLinearLayoutFeature_ = false; 110 bool isInfiniteLayout_ = false; 111 TextDirection textDir_ = TextDirection::LTR; 112 113 ACE_DISALLOW_COPY_AND_MOVE(FlexLayoutAlgorithm); 114 }; 115 } // namespace OHOS::Ace::NG 116 117 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERN_FLEX_FLEX_LAYOUT_ALGORITHM_H 118