1// Copyright 2013 The Flutter Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef FLUTTER_LIB_UI_TEXT_PARAGRAPH_H_
6#define FLUTTER_LIB_UI_TEXT_PARAGRAPH_H_
7
8#include "flutter/fml/message_loop.h"
9#include "flutter/lib/ui/dart_wrapper.h"
10#include "flutter/lib/ui/painting/canvas.h"
11#include "flutter/lib/ui/text/line_metrics.h"
12#include "flutter/lib/ui/text/text_box.h"
13#include "flutter/third_party/txt/src/txt/paragraph.h"
14
15namespace flutter {
16
17class Paragraph : public RefCountedDartWrappable<Paragraph> {
18 DEFINE_WRAPPERTYPEINFO();
19 FML_FRIEND_MAKE_REF_COUNTED(Paragraph);
20
21 public:
22 static void Create(Dart_Handle paragraph_handle,
23 std::unique_ptr<txt::Paragraph> txt_paragraph) {
24 auto paragraph = fml::MakeRefCounted<Paragraph>(args: std::move(txt_paragraph));
25 paragraph->AssociateWithDartWrapper(wrappable: paragraph_handle);
26 }
27
28 ~Paragraph() override;
29
30 double width();
31 double height();
32 double longestLine();
33 double minIntrinsicWidth();
34 double maxIntrinsicWidth();
35 double alphabeticBaseline();
36 double ideographicBaseline();
37 bool didExceedMaxLines();
38
39 void layout(double width);
40 void paint(Canvas* canvas, double x, double y);
41
42 tonic::Float32List getRectsForRange(unsigned start,
43 unsigned end,
44 unsigned boxHeightStyle,
45 unsigned boxWidthStyle);
46 tonic::Float32List getRectsForPlaceholders();
47 Dart_Handle getPositionForOffset(double dx, double dy);
48 Dart_Handle getWordBoundary(unsigned offset);
49 Dart_Handle getLineBoundary(unsigned offset);
50 tonic::Float64List computeLineMetrics();
51
52 void dispose();
53
54 private:
55 std::unique_ptr<txt::Paragraph> m_paragraph;
56
57 explicit Paragraph(std::unique_ptr<txt::Paragraph> paragraph);
58};
59
60} // namespace flutter
61
62#endif // FLUTTER_LIB_UI_TEXT_PARAGRAPH_H_
63

source code of flutter_engine/flutter/lib/ui/text/paragraph.h