Flutter Engine
paragraph_builder_skia.h
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1 /*
2  * Copyright 2019 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef LIB_TXT_SRC_PARAGRAPH_BUILDER_SKIA_H_
18 #define LIB_TXT_SRC_PARAGRAPH_BUILDER_SKIA_H_
19 
20 #include "txt/paragraph_builder.h"
21 
22 #include "third_party/skia/modules/skparagraph/include/ParagraphBuilder.h"
23 
24 namespace txt {
25 
26 // Implementation of ParagraphBuilder based on Skia's text layout module.
28  public:
30  std::shared_ptr<FontCollection> font_collection);
31 
32  virtual ~ParagraphBuilderSkia();
33 
34  virtual void PushStyle(const TextStyle& style) override;
35  virtual void Pop() override;
36  virtual const TextStyle& PeekStyle() override;
37  virtual void AddText(const std::u16string& text) override;
38  virtual void AddPlaceholder(PlaceholderRun& span) override;
39  virtual std::unique_ptr<Paragraph> Build() override;
40 
41  private:
42  std::shared_ptr<skia::textlayout::ParagraphBuilder> builder_;
43  TextStyle base_style_;
44  std::stack<TextStyle> txt_style_stack_;
45 };
46 
47 } // namespace txt
48 
49 #endif // LIB_TXT_SRC_PARAGRAPH_BUILDER_SKIA_H_
virtual void AddText(const std::u16string &text) override
ParagraphBuilderSkia(const ParagraphStyle &style, std::shared_ptr< FontCollection > font_collection)
virtual std::unique_ptr< Paragraph > Build() override
virtual void AddPlaceholder(PlaceholderRun &span) override
virtual const TextStyle & PeekStyle() override
virtual void PushStyle(const TextStyle &style) override