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_TEXT_TEXT_LAYOUT_ALGORITHM_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERN_TEXT_TEXT_LAYOUT_ALGORITHM_H 18 19 #include <string> 20 #include <utility> 21 22 #include "core/components_ng/layout/box_layout_algorithm.h" 23 #include "core/components_ng/layout/layout_wrapper.h" 24 #include "core/components_ng/pattern/text/span_node.h" 25 #include "core/components_ng/pattern/text/text_styles.h" 26 #include "core/components_ng/render/drawing.h" 27 #include "core/components_ng/render/paragraph.h" 28 29 namespace OHOS::Ace::NG { 30 class PipelineContext; 31 32 // TextLayoutAlgorithm acts as the underlying text layout. 33 class ACE_EXPORT TextLayoutAlgorithm : public BoxLayoutAlgorithm { 34 DECLARE_ACE_TYPE(TextLayoutAlgorithm, BoxLayoutAlgorithm); 35 36 public: 37 TextLayoutAlgorithm(); 38 TextLayoutAlgorithm(std::list<RefPtr<SpanItem>> spanItemChildren,const RefPtr<Paragraph> & paragraph)39 TextLayoutAlgorithm(std::list<RefPtr<SpanItem>> spanItemChildren, const RefPtr<Paragraph>& paragraph) 40 : spanItemChildren_(std::move(spanItemChildren)), paragraph_(paragraph) 41 {} 42 43 ~TextLayoutAlgorithm() override = default; 44 45 void OnReset() override; 46 47 void Measure(LayoutWrapper* layoutWrapper) override; 48 49 std::optional<SizeF> MeasureContent( 50 const LayoutConstraintF& contentConstraint, LayoutWrapper* layoutWrapper) override; 51 52 const RefPtr<Paragraph>& GetParagraph(); 53 54 std::list<RefPtr<SpanItem>>&& GetSpanItemChildren(); 55 56 float GetBaselineOffset() const; 57 58 private: 59 bool CreateParagraph(const TextStyle& textStyle, std::string content); 60 bool CreateParagraphAndLayout( 61 const TextStyle& textStyle, const std::string& content, const LayoutConstraintF& contentConstraint); 62 bool AdaptMinTextSize(TextStyle& textStyle, const std::string& content, const LayoutConstraintF& contentConstraint, 63 const RefPtr<PipelineContext>& pipeline); 64 bool DidExceedMaxLines(const SizeF& maxSize); 65 static TextDirection GetTextDirection(const std::string& content); 66 float GetTextWidth() const; 67 SizeF GetMaxMeasureSize(const LayoutConstraintF& contentConstraint) const; 68 69 std::list<RefPtr<SpanItem>> spanItemChildren_; 70 RefPtr<Paragraph> paragraph_; 71 float baselineOffset_ = 0.0f; 72 73 ACE_DISALLOW_COPY_AND_MOVE(TextLayoutAlgorithm); 74 }; 75 } // namespace OHOS::Ace::NG 76 77 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERN_TEXT_TEXT_LAYOUT_ALGORITHM_H 78