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882 行
30 KiB
882 行
30 KiB
using System;
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using System.Collections.Generic;
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using Unity.UIWidgets.foundation;
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using Unity.UIWidgets.ui.txt;
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using UnityEngine;
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namespace Unity.UIWidgets.ui
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{
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public struct Vector2d
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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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public int start, end;
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public IndexRange(int s, int e)
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{
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start = s;
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end = e;
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}
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int width()
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{
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return end - start;
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}
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void shift(int delta)
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{
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start += delta;
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end += delta;
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}
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public bool Equals(IndexRange other)
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{
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return start == other.start && end == other.end;
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}
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public override bool Equals(object obj)
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{
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if (ReferenceEquals(null, obj)) return false;
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return obj is IndexRange && Equals((IndexRange) obj);
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}
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public override int GetHashCode()
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{
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unchecked
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{
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return (start * 397) ^ 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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{
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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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{
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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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{
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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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{
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position = p;
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affinity = a;
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}
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}
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public class Paragraph
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{
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struct Range<T>: IEquatable<Range<T>>
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{
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public Range(T start, T end)
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{
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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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{
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return EqualityComparer<T>.Default.Equals(start, other.start) && EqualityComparer<T>.Default.Equals(end, other.end);
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}
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public override bool Equals(object obj)
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{
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if (ReferenceEquals(null, obj)) return false;
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return obj is Range<T> && Equals((Range<T>) obj);
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}
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public override int GetHashCode()
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{
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unchecked
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{
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return (EqualityComparer<T>.Default.GetHashCode(start) * 397) ^ EqualityComparer<T>.Default.GetHashCode(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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{
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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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{
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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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{
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public LineRange(int start, int end, int endExcludingWhitespace, int endIncludingNewLine, bool hardBreak)
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{
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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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private bool _needsLayout = true;
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private string _text;
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private StyledRuns _runs;
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private ParagraphStyle _paragraphStyle;
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private List<LineRange> _lineRanges = new List<LineRange>();
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private List<double> _lineWidths = new List<double>();
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private List<double> _lineBaseLines = new List<double>();
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private Vector2d[] _characterPositions;
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private double _maxIntrinsicWidth;
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private double _minIntrinsicWidth;
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private double _alphabeticBaseline;
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private double _ideographicBaseline;
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private double[] _characterWidths;
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private List<double> _lineHeights = new List<double>();
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private List<PaintRecord> _paintRecords = new List<PaintRecord>();
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private List<CodeUnitRun> _codeUnitRuns = new List<CodeUnitRun>();
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private bool _didExceedMaxLines;
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// private double _characterWidth;
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private double _width;
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public const char CHAR_NBSP = '\u00A0';
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private const double kDoubleDecorationSpacing = 3.0;
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public static bool isWordSpace(char ch)
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{
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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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{
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get { return _lineHeights.Count == 0 ? 0 : _lineHeights[_lineHeights.Count - 1]; }
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}
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public double minIntrinsicWidth
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{
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get { return _minIntrinsicWidth; }
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}
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public double maxIntrinsicWidth
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{
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get { return _maxIntrinsicWidth; }
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}
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public double width
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{
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get { return _width; }
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}
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public double alphabeticBaseline
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{
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get { return _alphabeticBaseline; }
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}
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public double ideographicBaseline
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{
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get { return _ideographicBaseline; }
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}
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public bool didExceedMaxLines
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{
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get { return _didExceedMaxLines; }
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}
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public void paint(Canvas canvas, Offset offset)
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{
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foreach (var paintRecord in _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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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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{
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if (!_needsLayout && _width == constraints.width)
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{
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return;
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}
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_needsLayout = false;
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_width = Math.Floor(constraints.width);
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this.setup();
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computeLineBreak();
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var maxLines = _paragraphStyle.maxLines ?? 0;
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_didExceedMaxLines = !(maxLines == 0 || _lineRanges.Count <= maxLines);
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var lineLimits = maxLines == 0 ? _lineRanges.Count : Math.Min(maxLines, _lineRanges.Count);
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layoutLines(lineLimits);
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double maxWordWidth = 0;
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for (int lineNumber = 0; lineNumber < lineLimits; ++lineNumber)
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{
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var line = _lineRanges[lineNumber];
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var words = findWords(line.start, line.end);
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words.ForEach((word) =>
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{
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Debug.Assert(word.start < word.end);
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double wordWidth = _characterPositions[word.end - 1].x - _characterPositions[word.start].x +
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_characterWidths[word.end - 1];
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if (wordWidth > maxWordWidth)
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{
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maxWordWidth = wordWidth;
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}
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});
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if (_paragraphStyle.TextAlign == TextAlign.justify && !_lineRanges[lineNumber].hardBreak
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&& lineNumber != lineLimits - 1)
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{
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justifyLine(lineNumber, words);
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} else if (line.endExcludingWhitespace > line.start)
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{
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Debug.Assert(!isLineEndSpace(_text[line.endExcludingWhitespace - 1]));
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var lineTotalAdvance = _characterPositions[line.endExcludingWhitespace - 1].x +
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_characterWidths[line.endExcludingWhitespace - 1];
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double xOffset = getLineXOffset(lineTotalAdvance);
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if (xOffset > 0 || xOffset < 0)
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{
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offsetCharacters(new Vector2d(xOffset, 0),
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_characterPositions, line.start, line.endExcludingWhitespace);
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}
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}
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}
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computeWidthMetrics(maxWordWidth);
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}
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public void setText(string text, StyledRuns runs)
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{
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_text = text;
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_runs = runs;
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_needsLayout = true;
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}
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public void setParagraphStyle(ParagraphStyle style)
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{
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_needsLayout = true;
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_paragraphStyle = style;
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}
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public List<TextBox> getRectsForRange(int start, int end)
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{
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var lineBoxes = new SortedDictionary<int, List<TextBox>>();
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foreach (var run in _codeUnitRuns)
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{
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if (run.codeUnits.start >= end)
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{
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break;
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}
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if (run.codeUnits.end <= start)
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{
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continue;
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}
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var baseLine = _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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{
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List<TextBox> boxs;
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if (!lineBoxes.TryGetValue(run.lineNumber, out boxs))
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{
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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 = _characterPositions[from].x;
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double right = _characterPositions[to - 1].x + _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 < _lineRanges.Count; ++lineNumber)
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{
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var line = _lineRanges[lineNumber];
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if (line.start >= end)
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{
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break;
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}
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if (line.endIncludingNewLine <= start)
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{
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continue;
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}
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if (!lineBoxes.ContainsKey(lineNumber))
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{
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if (line.end != line.endIncludingNewLine && line.end >= start && line.endIncludingNewLine <= end)
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{
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var x = _lineWidths[lineNumber];
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var top = (lineNumber > 0) ? _lineHeights[lineNumber - 1] : 0;
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var bottom = _lineHeights[lineNumber];
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lineBoxes.Add(lineNumber, new List<TextBox>(){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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var result = new List<TextBox>();
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foreach (var keyValuePair in lineBoxes)
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{
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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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{
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if (_text.Length == 0 || _text[_text.Length - 1] != '\n')
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{
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return null;
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}
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var lineNumber = getLineCount() - 1;
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var top = (lineNumber > 0) ? _lineHeights[lineNumber - 1] : 0;
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var bottom = _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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{
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if (_lineHeights.Count == 0)
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{
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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 < _lineHeights.Count - 1; ++yIndex)
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{
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if (dy < _lineHeights[yIndex])
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{
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break;
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}
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}
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var line = _lineRanges[yIndex];
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if (line.start >= line.end)
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{
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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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{
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if (dx < _characterPositions[index].x + _characterWidths[index])
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{
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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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{
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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 = _codeUnitRuns.Find((u) => u.codeUnits.start >= index && index < u.codeUnits.end);
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if (codeUnit != null)
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{
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direction = codeUnit.direction;
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}
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double glyphCenter = (_characterPositions[index].x + _characterPositions[index].x + _characterWidths[index]) / 2;
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if ((direction == TextDirection.ltr && dx < glyphCenter) || (direction == TextDirection.rtl && dx >= glyphCenter))
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{
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return new PositionWithAffinity(index, TextAffinity.downstream);
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} else
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{
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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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{
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D.assert(!_needsLayout);
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if (position.offset < 0)
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{
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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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{
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offset = _isUtf16Surrogate(_text[offset - 1]) ? offset - 2 : offset - 1;
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}
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var lineCount = getLineCount();
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for (int lineIndex = 0; lineIndex < getLineCount(); ++lineIndex)
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{
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var line = _lineRanges[lineIndex];
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if ((offset >= line.start && offset < line.endIncludingNewLine))
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{
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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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{
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return _lineRanges[lineIndex];
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}
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public IndexRange getWordBoundary(int offset)
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{
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WordSeparate s = new WordSeparate(_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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{
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if (characterPos != null)
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{
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for (int i = start; i < characterPos.Length && i < end; ++i)
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{
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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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{
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return _lineHeights.Count;
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}
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private void computeWidthMetrics(double maxWordWidth)
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{
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_maxIntrinsicWidth = 0;
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double lineBlockWidth = 0;
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for (int i = 0; i < _lineWidths.Count; ++i)
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{
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var line = _lineRanges[i];
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lineBlockWidth += _lineWidths[i];
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if (line.hardBreak)
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{
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_maxIntrinsicWidth = Math.Max(lineBlockWidth, _maxIntrinsicWidth);
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lineBlockWidth = 0;
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}
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}
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if (_paragraphStyle.maxLines == 1 || (((_paragraphStyle.maxLines??0) == 0) &&
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!string.IsNullOrEmpty(_paragraphStyle.ellipsis)))
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{
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_minIntrinsicWidth = _maxIntrinsicWidth;
|
|
}
|
|
else
|
|
{
|
|
_minIntrinsicWidth = Math.Min(maxWordWidth, _maxIntrinsicWidth);
|
|
}
|
|
}
|
|
|
|
private void setup()
|
|
{
|
|
if (_characterPositions == null || _characterPositions.Length < _text.Length)
|
|
{
|
|
_characterPositions = new Vector2d[_text.Length];
|
|
}
|
|
|
|
_lineHeights.Clear();
|
|
_lineRanges.Clear();
|
|
_lineWidths.Clear();
|
|
_lineBaseLines.Clear();
|
|
_paintRecords.Clear();
|
|
_codeUnitRuns.Clear();
|
|
_characterWidths = new double[_text.Length];
|
|
for (int i = 0; i < _runs.size; ++i)
|
|
{
|
|
var run = _runs.getRun(i);
|
|
if (run.start < run.end)
|
|
{
|
|
var font = FontManager.instance.getOrCreate(run.style.fontFamily).font;
|
|
font.RequestCharactersInTexture(_text.Substring(run.start, run.end - run.start), run.style.UnityFontSize,
|
|
run.style.UnityFontStyle);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void layoutLines(int lineLimits)
|
|
{
|
|
double yOffset = 0;
|
|
var runIndex = 0;
|
|
double lastDescent = 0.0f;
|
|
var linePaintRecords = new List<PaintRecord>();
|
|
|
|
for (int lineNumber = 0; lineNumber < lineLimits; lineNumber++)
|
|
{
|
|
var line = _lineRanges[lineNumber];
|
|
double maxAscent = 0.0f;
|
|
double maxDescent = 0.0f;
|
|
linePaintRecords.Clear();
|
|
for (;;)
|
|
{
|
|
var run = runIndex < _runs.size ? _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 = _characterPositions[end - 1].x + _characterWidths[end - 1] -
|
|
_characterPositions[start].x;
|
|
if (end > start)
|
|
{
|
|
var bounds = Rect.fromLTWH(0, -metrics.ascent,
|
|
_characterPositions[end - 1].x + _characterWidths[end - 1] -
|
|
_characterPositions[start].x,
|
|
metrics.ascent + metrics.descent);
|
|
|
|
linePaintRecords.Add(new PaintRecord(run.style, new Offset(_characterPositions[start].x, yOffset)
|
|
, new TextBlob(
|
|
_text, start, end, _characterPositions, run.style, bounds), metrics,
|
|
lineNumber, width));
|
|
_codeUnitRuns.Add(new CodeUnitRun(
|
|
new IndexRange(start, end), lineNumber, metrics, TextDirection.ltr));
|
|
}
|
|
}
|
|
|
|
if (runIndex + 1 >= _runs.size)
|
|
{
|
|
break;
|
|
}
|
|
|
|
if (run.end < line.end)
|
|
{
|
|
runIndex++;
|
|
}
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (lineNumber == 0)
|
|
{
|
|
_alphabeticBaseline = maxAscent;
|
|
_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);
|
|
}
|
|
_paintRecords.AddRange(linePaintRecords);
|
|
|
|
for (var charIndex = line.start; charIndex < line.end; charIndex++)
|
|
{
|
|
_characterPositions[charIndex].y = yOffset;
|
|
}
|
|
|
|
_lineHeights.Add((_lineHeights.Count == 0 ? 0 : _lineHeights[_lineHeights.Count - 1]) +
|
|
Math.Round(maxAscent + maxDescent));
|
|
_lineBaseLines.Add(yOffset);
|
|
lastDescent = maxDescent;
|
|
}
|
|
}
|
|
|
|
private void computeLineBreak()
|
|
{
|
|
var newLinePositions = new List<int>();
|
|
for (var i = 0; i < _text.Length; i++)
|
|
{
|
|
if (_text[i] == '\n')
|
|
{
|
|
newLinePositions.Add(i);
|
|
}
|
|
}
|
|
newLinePositions.Add(_text.Length);
|
|
|
|
var lineBreaker = new LineBreaker();
|
|
lineBreaker.setup(_text, _runs, _width, _characterPositions, _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)
|
|
{
|
|
_lineRanges.Add(new LineRange(blockStart, blockEnd, blockEnd,
|
|
blockEnd < _text.Length ? blockEnd + 1: blockEnd, true));
|
|
_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(_text[nonSpaceEnd - 1]))
|
|
{
|
|
nonSpaceEnd--;
|
|
}
|
|
|
|
_lineRanges.Add(new LineRange(line.start, end, nonSpaceEnd,
|
|
end == blockEnd && end < _text.Length ? end + 1 : end, end == blockEnd));
|
|
_lineWidths.Add(line.width);
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
private double getLineXOffset(double lineTotalAdvance) {
|
|
if (double.IsInfinity(_width))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
var align = _paragraphStyle.TextAlign;
|
|
if (align == TextAlign.right) {
|
|
return _width - lineTotalAdvance;
|
|
} else if (align == TextAlign.center) {
|
|
return Utils.PixelCorrectRound((_width - lineTotalAdvance) / 2);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
private void justifyLine(int lineNumber, List<Range<int>> words)
|
|
{
|
|
if (words.Count <= 1)
|
|
{
|
|
return;
|
|
}
|
|
|
|
var line = _lineRanges[lineNumber];
|
|
Debug.Assert(!isLineEndSpace(_text[line.endExcludingWhitespace - 1]));
|
|
var lineTotalAdvance = _characterPositions[line.endExcludingWhitespace - 1].x +
|
|
_characterWidths[line.endExcludingWhitespace - 1];
|
|
double gapWidth = (_width - lineTotalAdvance) / (words.Count - 1);
|
|
|
|
double justifyOffset = 0.0;
|
|
foreach (var word in words)
|
|
{
|
|
offsetCharacters(new Vector2d(justifyOffset),
|
|
_characterPositions, word.start, word.end);
|
|
justifyOffset += gapWidth;
|
|
justifyOffset = Utils.PixelCorrectRound(justifyOffset);
|
|
}
|
|
}
|
|
|
|
private 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(_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;
|
|
}
|
|
|
|
private 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;
|
|
}
|
|
}
|
|
}
|
|
|
|
private static bool _isUtf16Surrogate(int value)
|
|
{
|
|
return (value & 0xF800) == 0xD800;
|
|
}
|
|
|
|
}
|
|
}
|