paragraph.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_H_
#define FLUTTER_IMPELLER_TOOLKIT_INTEROP_PARAGRAPH_H_
 
#include "flutter/txt/src/txt/paragraph.h"
#include "impeller/toolkit/interop/glyph_info.h"
#include "impeller/toolkit/interop/impeller.h"
#include "impeller/toolkit/interop/line_metrics.h"
#include "impeller/toolkit/interop/object.h"
 
namespace impeller::interop {
 
/**
 * An immutable fully laid out paragraph.
 */
class Paragraph final
    : public Object<Paragraph,
                    IMPELLER_INTERNAL_HANDLE_NAME(ImpellerParagraph)> {
 public:
  explicit Paragraph(std::unique_ptr<txt::Paragraph> paragraph);
 
  ~Paragraph() override;
 
  Paragraph(const Paragraph&) = delete;
 
  Paragraph& operator=(const Paragraph&) = delete;
 
  Scalar GetMaxWidth() const;
 
  Scalar GetHeight() const;
 
  Scalar GetLongestLineWidth() const;
 
  Scalar GetMinIntrinsicWidth() const;
 
  Scalar GetMaxIntrinsicWidth() const;
 
  Scalar GetIdeographicBaseline() const;
 
  Scalar GetAlphabeticBaseline() const;
 
  uint32_t GetLineCount() const;
 
  const std::unique_ptr<txt::Paragraph>& GetHandle() const;
 
  ScopedObject<LineMetrics> GetLineMetrics() const;
 
  ScopedObject<GlyphInfo> GetGlyphInfoAtCodeUnitIndex(
      size_t code_unit_index) const;
 
  ScopedObject<GlyphInfo> GetClosestGlyphInfoAtParagraphCoordinates(
      double x,
      double y) const;
 
  ImpellerRange GetWordBoundary(size_t code_unit_index) const;
 
 private:
  std::unique_ptr<txt::Paragraph> paragraph_;
  mutable ScopedObject<LineMetrics> lazy_line_metrics_;
};
 
}  // namespace impeller::interop
 
#endif  // FLUTTER_IMPELLER_TOOLKIT_INTEROP_PARAGRAPH_H_