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752 行
29 KiB
752 行
29 KiB
using System;
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using System.Collections.Generic;
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using Unity.UIWidgets.foundation;
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using UnityEngine;
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namespace Unity.UIWidgets.ui {
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public struct Vector2d {
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public double x;
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public double y;
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public Vector2d(double x = 0.0, double y = 0.0) {
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this.x = x;
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this.y = y;
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}
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public static Vector2d operator +(Vector2d a, Vector2d b) {
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return new Vector2d(a.x + b.x, a.y + b.y);
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}
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public static Vector2d operator -(Vector2d a, Vector2d b) {
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return new Vector2d(a.x - b.x, a.y - b.y);
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}
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}
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public class CodeUnitRun {
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public int lineNumber;
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public TextDirection direction;
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public IndexRange codeUnits;
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public FontMetrics fontMetrics;
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public CodeUnitRun(IndexRange cu, int line, FontMetrics fontMetrics, TextDirection direction) {
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this.lineNumber = line;
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this.codeUnits = cu;
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this.fontMetrics = fontMetrics;
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this.direction = direction;
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}
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}
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public class FontMetrics {
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public readonly double ascent;
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public readonly double descent;
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public readonly double? underlineThickness;
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public readonly double? underlinePosition;
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public readonly double? strikeoutPosition;
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public readonly double? fxHeight;
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public FontMetrics(double ascent, double descent,
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double? underlineThickness = null, double? underlinePosition = null, double? strikeoutPosition = null,
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double? fxHeight = null) {
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this.ascent = ascent;
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this.descent = descent;
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this.underlineThickness = underlineThickness;
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this.underlinePosition = underlinePosition;
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this.strikeoutPosition = strikeoutPosition;
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this.fxHeight = fxHeight;
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}
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public static FontMetrics fromFont(Font font, int fontSize, double? height) {
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var ascent = font.ascent * (height ?? 1.0) * fontSize / font.fontSize;
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var descent = (font.lineHeight - font.ascent) * (height ?? 1.0) * fontSize / font.fontSize;
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double? fxHeight = null;
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font.RequestCharactersInTexture("x", fontSize);
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CharacterInfo charInfo;
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if (font.GetCharacterInfo('x', out charInfo, fontSize)) {
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fxHeight = charInfo.glyphHeight;
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}
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return new FontMetrics(ascent, descent, fxHeight: fxHeight);
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}
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}
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public struct IndexRange : IEquatable<IndexRange> {
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public int start, end;
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public IndexRange(int s, int e) {
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this.start = s;
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this.end = e;
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}
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int width() {
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return this.end - this.start;
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}
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void shift(int delta) {
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this.start += delta;
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this.end += delta;
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}
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public bool Equals(IndexRange other) {
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return this.start == other.start && this.end == other.end;
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}
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public override bool Equals(object obj) {
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if (ReferenceEquals(null, obj)) {
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return false;
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}
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return obj is IndexRange && this.Equals((IndexRange) obj);
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}
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public override int GetHashCode() {
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unchecked {
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return (this.start * 397) ^ this.end;
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}
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}
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public static bool operator ==(IndexRange left, IndexRange right) {
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return left.Equals(right);
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}
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public static bool operator !=(IndexRange left, IndexRange right) {
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return !left.Equals(right);
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}
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}
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public class PositionWithAffinity {
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public readonly int position;
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public readonly TextAffinity affinity;
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public PositionWithAffinity(int p, TextAffinity a) {
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this.position = p;
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this.affinity = a;
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}
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}
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public class Paragraph {
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struct Range<T> : IEquatable<Range<T>> {
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public Range(T start, T end) {
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this.start = start;
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this.end = end;
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}
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public bool Equals(Range<T> other) {
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return EqualityComparer<T>.Default.Equals(this.start, other.start) &&
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EqualityComparer<T>.Default.Equals(this.end, other.end);
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}
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public override bool Equals(object obj) {
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if (ReferenceEquals(null, obj)) {
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return false;
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}
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return obj is Range<T> && this.Equals((Range<T>) obj);
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}
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public override int GetHashCode() {
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unchecked {
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return (EqualityComparer<T>.Default.GetHashCode(this.start) * 397) ^
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EqualityComparer<T>.Default.GetHashCode(this.end);
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}
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}
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public static bool operator ==(Range<T> left, Range<T> right) {
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return left.Equals(right);
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}
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public static bool operator !=(Range<T> left, Range<T> right) {
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return !left.Equals(right);
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}
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public T start, end;
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}
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public class LineRange {
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public LineRange(int start, int end, int endExcludingWhitespace, int endIncludingNewLine, bool hardBreak) {
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this.start = start;
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this.end = end;
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this.endExcludingWhitespace = endExcludingWhitespace;
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this.endIncludingNewLine = endIncludingNewLine;
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this.hardBreak = hardBreak;
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}
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public readonly int start;
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public readonly int end;
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public readonly int endExcludingWhitespace;
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public readonly int endIncludingNewLine;
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public readonly bool hardBreak;
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}
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bool _needsLayout = true;
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string _text;
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StyledRuns _runs;
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ParagraphStyle _paragraphStyle;
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List<LineRange> _lineRanges = new List<LineRange>();
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List<double> _lineWidths = new List<double>();
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List<double> _lineBaseLines = new List<double>();
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Vector2d[] _characterPositions;
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double _maxIntrinsicWidth;
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double _minIntrinsicWidth;
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double _alphabeticBaseline;
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double _ideographicBaseline;
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double[] _characterWidths;
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List<double> _lineHeights = new List<double>();
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List<PaintRecord> _paintRecords = new List<PaintRecord>();
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List<CodeUnitRun> _codeUnitRuns = new List<CodeUnitRun>();
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bool _didExceedMaxLines;
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// private double _characterWidth;
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double _width;
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public const char CHAR_NBSP = '\u00A0';
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const double kDoubleDecorationSpacing = 3.0;
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public static bool isWordSpace(char ch) {
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return ch == ' ' || ch == CHAR_NBSP;
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}
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// This function determines whether a character is a space that disappears at end of line.
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// It is the Unicode set: [[:General_Category=Space_Separator:]-[:Line_Break=Glue:]],
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// plus '\n'.
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// Note: all such characters are in the BMP, so it's ok to use code units for this.
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public static bool isLineEndSpace(char c) {
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return c == '\n' || c == ' ' || c == 0x1680 || (0x2000 <= c && c <= 0x200A && c != 0x2007) ||
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c == 0x205F || c == 0x3000;
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}
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public double height {
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get { return this._lineHeights.Count == 0 ? 0 : this._lineHeights[this._lineHeights.Count - 1]; }
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}
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public double minIntrinsicWidth {
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get { return this._minIntrinsicWidth; }
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}
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public double maxIntrinsicWidth {
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get { return this._maxIntrinsicWidth; }
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}
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public double width {
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get { return this._width; }
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}
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public double alphabeticBaseline {
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get { return this._alphabeticBaseline; }
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}
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public double ideographicBaseline {
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get { return this._ideographicBaseline; }
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}
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public bool didExceedMaxLines {
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get { return this._didExceedMaxLines; }
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}
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public void paint(Canvas canvas, Offset offset) {
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foreach (var paintRecord in this._paintRecords) {
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var paint = new Paint {
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color = paintRecord.style.color,
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};
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canvas.drawTextBlob(paintRecord.text, offset, paint);
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this.paintDecorations(canvas, paintRecord, offset);
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}
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}
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public void layout(ParagraphConstraints constraints) {
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if (!this._needsLayout && this._width == constraints.width) {
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return;
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}
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this._needsLayout = false;
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this._width = Math.Floor(constraints.width);
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this.setup();
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this.computeLineBreak();
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var maxLines = this._paragraphStyle.maxLines ?? 0;
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this._didExceedMaxLines = !(maxLines == 0 || this._lineRanges.Count <= maxLines);
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var lineLimits = maxLines == 0 ? this._lineRanges.Count : Math.Min(maxLines, this._lineRanges.Count);
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this.layoutLines(lineLimits);
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double maxWordWidth = 0;
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for (int lineNumber = 0; lineNumber < lineLimits; ++lineNumber) {
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var line = this._lineRanges[lineNumber];
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var words = this.findWords(line.start, line.end);
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words.ForEach((word) => {
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Debug.Assert(word.start < word.end);
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double wordWidth = this._characterPositions[word.end - 1].x -
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this._characterPositions[word.start].x + this._characterWidths[word.end - 1];
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if (wordWidth > maxWordWidth) {
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maxWordWidth = wordWidth;
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}
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});
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if (this._paragraphStyle.TextAlign == TextAlign.justify && !this._lineRanges[lineNumber].hardBreak
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&& lineNumber != lineLimits - 1) {
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this.justifyLine(lineNumber, words);
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} else if (line.endExcludingWhitespace > line.start) {
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Debug.Assert(!isLineEndSpace(this._text[line.endExcludingWhitespace - 1]));
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var lineTotalAdvance = this._characterPositions[line.endExcludingWhitespace - 1].x +
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this._characterWidths[line.endExcludingWhitespace - 1];
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double xOffset = this.getLineXOffset(lineTotalAdvance);
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if (xOffset > 0 || xOffset < 0) {
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offsetCharacters(new Vector2d(xOffset, 0), this._characterPositions, line.start,
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line.endExcludingWhitespace);
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}
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}
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}
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this.computeWidthMetrics(maxWordWidth);
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}
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public void setText(string text, StyledRuns runs) {
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this._text = text;
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this._runs = runs;
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this._needsLayout = true;
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}
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public void setParagraphStyle(ParagraphStyle style) {
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this._needsLayout = true;
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this._paragraphStyle = style;
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}
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public List<TextBox> getRectsForRange(int start, int end) {
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var lineBoxes = new SortedDictionary<int, List<TextBox>>();
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foreach (var run in this._codeUnitRuns) {
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if (run.codeUnits.start >= end) {
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break;
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}
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if (run.codeUnits.end <= start) {
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continue;
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}
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var baseLine = this._lineBaseLines[run.lineNumber];
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double top = baseLine - run.fontMetrics.ascent;
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double bottom = baseLine + run.fontMetrics.descent;
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var from = Math.Max(start, run.codeUnits.start);
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var to = Math.Min(end, run.codeUnits.end);
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if (from < to) {
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List<TextBox> boxs;
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if (!lineBoxes.TryGetValue(run.lineNumber, out boxs)) {
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boxs = new List<TextBox>();
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lineBoxes.Add(run.lineNumber, boxs);
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}
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double left = this._characterPositions[from].x;
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double right = this._characterPositions[to - 1].x + this._characterWidths[to - 1];
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boxs.Add(TextBox.fromLTBD(left, top, right, bottom, run.direction));
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}
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}
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for (int lineNumber = 0; lineNumber < this._lineRanges.Count; ++lineNumber) {
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var line = this._lineRanges[lineNumber];
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if (line.start >= end) {
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break;
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}
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if (line.endIncludingNewLine <= start) {
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continue;
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}
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if (!lineBoxes.ContainsKey(lineNumber)) {
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if (line.end != line.endIncludingNewLine && line.end >= start && line.endIncludingNewLine <= end) {
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var x = this._lineWidths[lineNumber];
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var top = (lineNumber > 0) ? this._lineHeights[lineNumber - 1] : 0;
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var bottom = this._lineHeights[lineNumber];
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lineBoxes.Add(lineNumber, new List<TextBox>() {
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TextBox.fromLTBD(
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x, top, x, bottom, TextDirection.ltr)
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});
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}
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}
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}
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var result = new List<TextBox>();
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foreach (var keyValuePair in lineBoxes) {
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result.AddRange(keyValuePair.Value);
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}
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return result;
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}
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public TextBox getNextLineStartRect() {
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if (this._text.Length == 0 || this._text[this._text.Length - 1] != '\n') {
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return null;
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}
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var lineNumber = this.getLineCount() - 1;
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var top = (lineNumber > 0) ? this._lineHeights[lineNumber - 1] : 0;
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var bottom = this._lineHeights[lineNumber];
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return TextBox.fromLTBD(0, top, 0, bottom, TextDirection.ltr);
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}
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public PositionWithAffinity getGlyphPositionAtCoordinate(double dx, double dy) {
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if (this._lineHeights.Count == 0) {
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return new PositionWithAffinity(0, TextAffinity.downstream);
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}
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int yIndex;
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for (yIndex = 0; yIndex < this._lineHeights.Count - 1; ++yIndex) {
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if (dy < this._lineHeights[yIndex]) {
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break;
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}
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}
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var line = this._lineRanges[yIndex];
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if (line.start >= line.end) {
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return new PositionWithAffinity(line.start, TextAffinity.downstream);
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}
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int index;
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for (index = line.start; index < line.end; ++index) {
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if (dx < this._characterPositions[index].x + this._characterWidths[index]) {
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break;
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}
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}
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if (index >= line.end) {
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return new PositionWithAffinity(line.end, TextAffinity.upstream);
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}
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TextDirection direction = TextDirection.ltr;
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var codeUnit = this._codeUnitRuns.Find((u) => u.codeUnits.start >= index && index < u.codeUnits.end);
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if (codeUnit != null) {
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direction = codeUnit.direction;
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}
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double glyphCenter = (this._characterPositions[index].x + this._characterPositions[index].x +
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this._characterWidths[index]) / 2;
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if ((direction == TextDirection.ltr && dx < glyphCenter) ||
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(direction == TextDirection.rtl && dx >= glyphCenter)) {
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return new PositionWithAffinity(index, TextAffinity.downstream);
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} else {
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return new PositionWithAffinity(index + 1, TextAffinity.upstream);
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}
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}
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public int getLine(TextPosition position) {
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D.assert(!this._needsLayout);
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if (position.offset < 0) {
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return 0;
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}
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var offset = position.offset;
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if (position.affinity == TextAffinity.upstream && offset > 0) {
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offset = _isUtf16Surrogate(this._text[offset - 1]) ? offset - 2 : offset - 1;
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}
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var lineCount = this.getLineCount();
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for (int lineIndex = 0; lineIndex < this.getLineCount(); ++lineIndex) {
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var line = this._lineRanges[lineIndex];
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if ((offset >= line.start && offset < line.endIncludingNewLine)) {
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return lineIndex;
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}
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}
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return Math.Max(lineCount - 1, 0);
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}
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public LineRange getLineRange(int lineIndex) {
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return this._lineRanges[lineIndex];
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}
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public IndexRange getWordBoundary(int offset) {
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WordSeparate s = new WordSeparate(this._text);
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return s.findWordRange(offset);
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}
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public static void offsetCharacters(Vector2d offset, Vector2d[] characterPos, int start, int end) {
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if (characterPos != null) {
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for (int i = start; i < characterPos.Length && i < end; ++i) {
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characterPos[i] = characterPos[i] + offset;
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}
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}
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}
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public int getLineCount() {
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return this._lineHeights.Count;
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}
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void computeWidthMetrics(double maxWordWidth) {
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this._maxIntrinsicWidth = 0;
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double lineBlockWidth = 0;
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for (int i = 0; i < this._lineWidths.Count; ++i) {
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var line = this._lineRanges[i];
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lineBlockWidth += this._lineWidths[i];
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if (line.hardBreak) {
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this._maxIntrinsicWidth = Math.Max(lineBlockWidth, this._maxIntrinsicWidth);
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lineBlockWidth = 0;
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}
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}
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if (this._paragraphStyle.maxLines == 1 || (((this._paragraphStyle.maxLines ?? 0) == 0) &&
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!string.IsNullOrEmpty(this._paragraphStyle.ellipsis))) {
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this._minIntrinsicWidth = this._maxIntrinsicWidth;
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} else {
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this._minIntrinsicWidth = Math.Min(maxWordWidth, this._maxIntrinsicWidth);
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}
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}
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void setup() {
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if (this._characterPositions == null || this._characterPositions.Length < this._text.Length) {
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this._characterPositions = new Vector2d[this._text.Length];
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}
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this._lineHeights.Clear();
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this._lineRanges.Clear();
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this._lineWidths.Clear();
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this._lineBaseLines.Clear();
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this._paintRecords.Clear();
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this._codeUnitRuns.Clear();
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this._characterWidths = new double[this._text.Length];
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for (int i = 0; i < this._runs.size; ++i) {
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var run = this._runs.getRun(i);
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if (run.start < run.end) {
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var font = FontManager.instance.getOrCreate(run.style.fontFamily).font;
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font.RequestCharactersInTexture(this._text.Substring(run.start, run.end - run.start),
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run.style.UnityFontSize,
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run.style.UnityFontStyle);
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}
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}
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}
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void layoutLines(int lineLimits) {
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double yOffset = 0;
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var runIndex = 0;
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double lastDescent = 0.0f;
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var linePaintRecords = new List<PaintRecord>();
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|
|
for (int lineNumber = 0; lineNumber < lineLimits; lineNumber++) {
|
|
var line = this._lineRanges[lineNumber];
|
|
double maxAscent = 0.0f;
|
|
double maxDescent = 0.0f;
|
|
linePaintRecords.Clear();
|
|
for (;;) {
|
|
var run = runIndex < this._runs.size ? this._runs.getRun(runIndex) : null;
|
|
if (run != null && run.start < run.end && run.start < line.end && run.end > line.start) {
|
|
var font = FontManager.instance.getOrCreate(run.style.fontFamily).font;
|
|
var metrics = FontMetrics.fromFont(font, run.style.UnityFontSize, run.style.height);
|
|
if (metrics.ascent > maxAscent) {
|
|
maxAscent = metrics.ascent;
|
|
}
|
|
if (metrics.descent > maxDescent) {
|
|
maxDescent = metrics.descent;
|
|
}
|
|
|
|
int start = Math.Max(run.start, line.start);
|
|
int end = Math.Min(run.end, line.end);
|
|
var width = this._characterPositions[end - 1].x + this._characterWidths[end - 1] -
|
|
this._characterPositions[start].x;
|
|
if (end > start) {
|
|
var bounds = Rect.fromLTWH(0, -metrics.ascent,
|
|
this._characterPositions[end - 1].x + this._characterWidths[end - 1] -
|
|
this._characterPositions[start].x,
|
|
metrics.ascent + metrics.descent);
|
|
|
|
linePaintRecords.Add(new PaintRecord(run.style,
|
|
new Offset(this._characterPositions[start].x, yOffset)
|
|
, new TextBlob(this._text, start, end, this._characterPositions, run.style, bounds),
|
|
metrics,
|
|
lineNumber, width));
|
|
this._codeUnitRuns.Add(new CodeUnitRun(
|
|
new IndexRange(start, end), lineNumber, metrics, TextDirection.ltr));
|
|
}
|
|
}
|
|
|
|
if (runIndex + 1 >= this._runs.size) {
|
|
break;
|
|
}
|
|
|
|
if (run.end < line.end) {
|
|
runIndex++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (lineNumber == 0) {
|
|
this._alphabeticBaseline = maxAscent;
|
|
this._ideographicBaseline = maxAscent; // todo Properly implement ideographic_baseline
|
|
}
|
|
|
|
yOffset = Utils.PixelCorrectRound(yOffset + maxAscent + lastDescent);
|
|
foreach (var record in linePaintRecords) {
|
|
record.offset = new Offset(record.offset.dx, yOffset);
|
|
}
|
|
this._paintRecords.AddRange(linePaintRecords);
|
|
|
|
for (var charIndex = line.start; charIndex < line.end; charIndex++) {
|
|
this._characterPositions[charIndex].y = yOffset;
|
|
}
|
|
|
|
this._lineHeights.Add(
|
|
(this._lineHeights.Count == 0 ? 0 : this._lineHeights[this._lineHeights.Count - 1]) +
|
|
Math.Round(maxAscent + maxDescent));
|
|
this._lineBaseLines.Add(yOffset);
|
|
lastDescent = maxDescent;
|
|
}
|
|
}
|
|
|
|
void computeLineBreak() {
|
|
var newLinePositions = new List<int>();
|
|
for (var i = 0; i < this._text.Length; i++) {
|
|
if (this._text[i] == '\n') {
|
|
newLinePositions.Add(i);
|
|
}
|
|
}
|
|
newLinePositions.Add(this._text.Length);
|
|
|
|
var lineBreaker = new LineBreaker();
|
|
lineBreaker.setup(this._text, this._runs, this._width, this._characterPositions, this._characterWidths);
|
|
|
|
for (var newlineIndex = 0; newlineIndex < newLinePositions.Count; ++newlineIndex) {
|
|
var blockStart = newlineIndex > 0 ? newLinePositions[newlineIndex - 1] + 1 : 0;
|
|
var blockEnd = newLinePositions[newlineIndex];
|
|
var blockSize = blockEnd - blockStart;
|
|
if (blockSize == 0) {
|
|
this._lineRanges.Add(new LineRange(blockStart, blockEnd, blockEnd,
|
|
blockEnd < this._text.Length ? blockEnd + 1 : blockEnd, true));
|
|
this._lineWidths.Add(0);
|
|
continue;
|
|
}
|
|
|
|
lineBreaker.doBreak(blockStart, blockEnd);
|
|
var lines = lineBreaker.getLines();
|
|
for (int i = 0; i < lines.Count; ++i) {
|
|
var line = lines[i];
|
|
var end = i + 1 < lines.Count ? lines[i + 1].start : blockEnd;
|
|
|
|
var nonSpaceEnd = end;
|
|
while (nonSpaceEnd > line.start && isLineEndSpace(this._text[nonSpaceEnd - 1])) {
|
|
nonSpaceEnd--;
|
|
}
|
|
|
|
this._lineRanges.Add(new LineRange(line.start, end, nonSpaceEnd,
|
|
end == blockEnd && end < this._text.Length ? end + 1 : end, end == blockEnd));
|
|
this._lineWidths.Add(line.width);
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
double getLineXOffset(double lineTotalAdvance) {
|
|
if (double.IsInfinity(this._width)) {
|
|
return 0;
|
|
}
|
|
|
|
var align = this._paragraphStyle.TextAlign;
|
|
if (align == TextAlign.right) {
|
|
return this._width - lineTotalAdvance;
|
|
} else if (align == TextAlign.center) {
|
|
return Utils.PixelCorrectRound((this._width - lineTotalAdvance) / 2);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void justifyLine(int lineNumber, List<Range<int>> words) {
|
|
if (words.Count <= 1) {
|
|
return;
|
|
}
|
|
|
|
var line = this._lineRanges[lineNumber];
|
|
Debug.Assert(!isLineEndSpace(this._text[line.endExcludingWhitespace - 1]));
|
|
var lineTotalAdvance = this._characterPositions[line.endExcludingWhitespace - 1].x +
|
|
this._characterWidths[line.endExcludingWhitespace - 1];
|
|
double gapWidth = (this._width - lineTotalAdvance) / (words.Count - 1);
|
|
|
|
double justifyOffset = 0.0;
|
|
foreach (var word in words) {
|
|
offsetCharacters(new Vector2d(justifyOffset), this._characterPositions, word.start, word.end);
|
|
justifyOffset += gapWidth;
|
|
justifyOffset = Utils.PixelCorrectRound(justifyOffset);
|
|
}
|
|
}
|
|
|
|
List<Range<int>> findWords(int start, int end) {
|
|
var inWord = false;
|
|
int wordStart = 0;
|
|
List<Range<int>> words = new List<Range<int>>();
|
|
for (int i = start; i < end; ++i) {
|
|
bool isSpace = isWordSpace(this._text[i]);
|
|
if (!inWord && !isSpace) {
|
|
wordStart = i;
|
|
inWord = true;
|
|
} else if (inWord && isSpace) {
|
|
words.Add(new Range<int>(wordStart, i));
|
|
inWord = false;
|
|
}
|
|
}
|
|
if (inWord) {
|
|
words.Add(new Range<int>(wordStart, end));
|
|
}
|
|
|
|
return words;
|
|
}
|
|
|
|
void paintDecorations(Canvas canvas, PaintRecord record, Offset baseOffset) {
|
|
if (record.style.decoration == null || record.style.decoration == TextDecoration.none) {
|
|
return;
|
|
}
|
|
|
|
var paint = new Paint();
|
|
if (record.style.decorationColor == null) {
|
|
paint.color = record.style.color;
|
|
} else {
|
|
paint.color = record.style.decorationColor;
|
|
}
|
|
|
|
|
|
var width = record.runWidth;
|
|
var metrics = record.metrics;
|
|
double underLineThickness = metrics.underlineThickness ?? (record.style.fontSize / 14.0);
|
|
paint.style = PaintingStyle.stroke;
|
|
paint.strokeWidth = underLineThickness;
|
|
var recordOffset = baseOffset + record.offset;
|
|
var x = recordOffset.dx;
|
|
var y = recordOffset.dy;
|
|
|
|
int decorationCount = 1;
|
|
switch (record.style.decorationStyle) {
|
|
case TextDecorationStyle.doubleLine:
|
|
decorationCount = 2;
|
|
break;
|
|
}
|
|
|
|
|
|
var decoration = record.style.decoration;
|
|
for (int i = 0; i < decorationCount; i++) {
|
|
double yOffset = i * underLineThickness * kDoubleDecorationSpacing;
|
|
double yOffsetOriginal = yOffset;
|
|
if (decoration != null && decoration.contains(TextDecoration.underline)) {
|
|
// underline
|
|
yOffset += metrics.underlinePosition ?? underLineThickness;
|
|
canvas.drawLine(new Offset(x, y + yOffset), new Offset(x + width, y + yOffset), paint);
|
|
yOffset = yOffsetOriginal;
|
|
}
|
|
|
|
if (decoration != null && decoration.contains(TextDecoration.overline)) {
|
|
yOffset -= metrics.ascent;
|
|
canvas.drawLine(new Offset(x, y + yOffset), new Offset(x + width, y + yOffset), paint);
|
|
yOffset = yOffsetOriginal;
|
|
}
|
|
|
|
if (decoration != null && decoration.contains(TextDecoration.lineThrough)) {
|
|
yOffset += (decorationCount - 1.0) * underLineThickness * kDoubleDecorationSpacing / -2.0;
|
|
yOffset += metrics.strikeoutPosition ?? (metrics.fxHeight ?? 0) / -2.0;
|
|
canvas.drawLine(new Offset(x, y + yOffset), new Offset(x + width, y + yOffset), paint);
|
|
yOffset = yOffsetOriginal;
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool _isUtf16Surrogate(int value) {
|
|
return (value & 0xF800) == 0xD800;
|
|
}
|
|
}
|
|
}
|