paragraph_builder.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_IMPELLER_TOOLKIT_INTEROP_PARAGRAPH_BUILDER_H_
#define FLUTTER_IMPELLER_TOOLKIT_INTEROP_PARAGRAPH_BUILDER_H_
 
#include <memory>
 
#include "flutter/txt/src/txt/paragraph_builder.h"
#include "impeller/toolkit/interop/impeller.h"
#include "impeller/toolkit/interop/object.h"
#include "impeller/toolkit/interop/paragraph.h"
#include "impeller/toolkit/interop/paragraph_style.h"
#include "impeller/toolkit/interop/typography_context.h"
 
namespace impeller::interop {
 
class ParagraphBuilder final
    : public Object<ParagraphBuilder,
                    IMPELLER_INTERNAL_HANDLE_NAME(ImpellerParagraphBuilder)> {
 public:
  explicit ParagraphBuilder(ScopedObject<TypographyContext> context);
 
  ~ParagraphBuilder() override;
 
  ParagraphBuilder(const ParagraphBuilder&) = delete;
 
  ParagraphBuilder& operator=(const ParagraphBuilder&) = delete;
 
  bool IsValid() const;
 
  void PushStyle(const ParagraphStyle& style);
 
  void PopStyle();
 
  void AddText(const uint8_t* data, size_t byte_length);
 
  ScopedObject<Paragraph> Build(Scalar width) const;
 
 private:
  ScopedObject<TypographyContext> context_;
  mutable std::unique_ptr<txt::ParagraphBuilder> lazy_builder_;
 
  const std::unique_ptr<txt::ParagraphBuilder>& GetBuilder(
      const txt::ParagraphStyle& style) const;
 
  const std::unique_ptr<txt::ParagraphBuilder>& GetBuilder() const;
};
 
}  // namespace impeller::interop
 
#endif  // FLUTTER_IMPELLER_TOOLKIT_INTEROP_PARAGRAPH_BUILDER_H_