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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.
#include "flutter/lib/ui/text/paragraph.h"
#include "flutter/common/settings.h"
#include "flutter/common/task_runners.h"
#include "flutter/fml/logging.h"
#include "flutter/fml/task_runner.h"
#include "third_party/tonic/converter/dart_converter.h"
#include "third_party/tonic/dart_args.h"
#include "third_party/tonic/dart_binding_macros.h"
#include "third_party/tonic/dart_library_natives.h"
namespace flutter {
IMPLEMENT_WRAPPERTYPEINFO(ui, Paragraph);
Paragraph::Paragraph(std::unique_ptr<txt::Paragraph> paragraph)
: m_paragraph(std::move(paragraph)) {}
Paragraph::~Paragraph() = default;
size_t Paragraph::GetAllocationSize() const {
// We don't have an accurate accounting of the paragraph's memory consumption,
// so return a fixed size to indicate that its impact is more than the size
// of the Paragraph class.
return 2000;
}
double Paragraph::width() {
return m_paragraph->GetMaxWidth();
}
double Paragraph::height() {
return m_paragraph->GetHeight();
}
double Paragraph::longestLine() {
return m_paragraph->GetLongestLine();
}
double Paragraph::minIntrinsicWidth() {
return m_paragraph->GetMinIntrinsicWidth();
}
double Paragraph::maxIntrinsicWidth() {
return m_paragraph->GetMaxIntrinsicWidth();
}
double Paragraph::alphabeticBaseline() {
return m_paragraph->GetAlphabeticBaseline();
}
double Paragraph::ideographicBaseline() {
return m_paragraph->GetIdeographicBaseline();
}
bool Paragraph::didExceedMaxLines() {
return m_paragraph->DidExceedMaxLines();
}
void Paragraph::layout(double width) {
m_paragraph->Layout(width);
}
void Paragraph::paint(Canvas* canvas, double x, double y) {
SkCanvas* sk_canvas = canvas->canvas();
if (!sk_canvas) {
return;
}
m_paragraph->Paint(sk_canvas, x, y);
}
static tonic::Float32List EncodeTextBoxes(
const std::vector<txt::Paragraph::TextBox>& boxes) {
// Layout:
// First value is the number of values.
// Then there are boxes.size() groups of 5 which are LTRBD, where D is the
// text direction index.
tonic::Float32List result(
Dart_NewTypedData(Dart_TypedData_kFloat32, boxes.size() * 5));
uint64_t position = 0;
for (uint64_t i = 0; i < boxes.size(); i++) {
const txt::Paragraph::TextBox& box = boxes[i];
result[position++] = box.rect.fLeft;
result[position++] = box.rect.fTop;
result[position++] = box.rect.fRight;
result[position++] = box.rect.fBottom;
result[position++] = static_cast<float>(box.direction);
}
return result;
}
tonic::Float32List Paragraph::getRectsForRange(unsigned start,
unsigned end,
unsigned boxHeightStyle,
unsigned boxWidthStyle) {
std::vector<txt::Paragraph::TextBox> boxes = m_paragraph->GetRectsForRange(
start, end, static_cast<txt::Paragraph::RectHeightStyle>(boxHeightStyle),
static_cast<txt::Paragraph::RectWidthStyle>(boxWidthStyle));
return EncodeTextBoxes(boxes);
}
tonic::Float32List Paragraph::getRectsForPlaceholders() {
std::vector<txt::Paragraph::TextBox> boxes =
m_paragraph->GetRectsForPlaceholders();
return EncodeTextBoxes(boxes);
}
Dart_Handle Paragraph::getPositionForOffset(double dx, double dy) {
txt::Paragraph::PositionWithAffinity pos =
m_paragraph->GetGlyphPositionAtCoordinate(dx, dy);
std::vector<size_t> result = {
pos.position, // size_t already
static_cast<size_t>(pos.affinity) // affinity (enum)
};
return tonic::DartConverter<decltype(result)>::ToDart(result);
}
Dart_Handle Paragraph::getWordBoundary(unsigned offset) {
txt::Paragraph::Range<size_t> point = m_paragraph->GetWordBoundary(offset);
std::vector<size_t> result = {point.start, point.end};
return tonic::DartConverter<decltype(result)>::ToDart(result);
}
Dart_Handle Paragraph::getLineBoundary(unsigned offset) {
std::vector<txt::LineMetrics> metrics = m_paragraph->GetLineMetrics();
int line_start = -1;
int line_end = -1;
for (txt::LineMetrics& line : metrics) {
if (offset >= line.start_index && offset <= line.end_index) {
line_start = line.start_index;
line_end = line.end_index;
break;
}
}
std::vector<int> result = {line_start, line_end};
return tonic::DartConverter<decltype(result)>::ToDart(result);
}
tonic::Float64List Paragraph::computeLineMetrics() {
std::vector<txt::LineMetrics> metrics = m_paragraph->GetLineMetrics();
// Layout:
// boxes.size() groups of 9 which are the line metrics
// properties
tonic::Float64List result(
Dart_NewTypedData(Dart_TypedData_kFloat64, metrics.size() * 9));
uint64_t position = 0;
for (uint64_t i = 0; i < metrics.size(); i++) {
const txt::LineMetrics& line = metrics[i];
result[position++] = static_cast<double>(line.hard_break);
result[position++] = line.ascent;
result[position++] = line.descent;
result[position++] = line.unscaled_ascent;
// We add then round to get the height. The
// definition of height here is different
// than the one in LibTxt.
result[position++] = round(line.ascent + line.descent);
result[position++] = line.width;
result[position++] = line.left;
result[position++] = line.baseline;
result[position++] = static_cast<double>(line.line_number);
}
return result;
}
} // namespace flutter