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502 行
17 KiB
502 行
17 KiB
using System;
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using System.Collections.Generic;
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using UIWidgets.ui.txt;
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using UnityEngine;
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namespace 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 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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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 static readonly Shader textShader;
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static Paragraph() {
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textShader = Shader.Find("UIWidgets/Text Shader");
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if (textShader == null) {
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throw new Exception("UIWidgets/Text Shader Lines not found");
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}
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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 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 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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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, double x, double y)
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{
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foreach (var paintRecord in _paintRecords)
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{
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canvas.drawTextBlob(paintRecord.text, x, y);
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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 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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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;
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}
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else
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{
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_minIntrinsicWidth = Math.Min(maxWordWidth, _maxIntrinsicWidth);
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}
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}
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private void setup()
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{
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if (_characterPositions == null || _characterPositions.Length < _text.Length)
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{
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_characterPositions = new Vector2d[_text.Length];
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}
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_lineHeights.Clear();
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_lineRanges.Clear();
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_lineWidths.Clear();
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_paintRecords.Clear();
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_characterWidths = new double[_text.Length];
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for (int i = 0; i < _runs.size; ++i)
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{
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var run = _runs.getRun(i);
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if (run.start < run.end)
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{
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var font = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize);
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font.RequestCharactersInTexture(_text.Substring(run.start, run.end - run.start), 0,
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run.style.UnityFontStyle);
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}
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}
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}
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private void layoutLines(int lineLimits)
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{
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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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for (int lineNumber = 0; lineNumber < lineLimits; lineNumber++)
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{
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var line = _lineRanges[lineNumber];
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double maxAscent = 0.0f;
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double maxDescent = 0.0f;
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for (;;)
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{
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var run = _runs.getRun(runIndex);
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if (run.start < run.end && run.start < line.end && run.end > line.start)
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{
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var font = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize);
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var ascent = font.ascent * (run.style.height??1.0);
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var descent = (font.lineHeight - font.ascent) * (run.style.height??1.0);
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if (ascent > maxAscent)
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{
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maxAscent = ascent;
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}
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if (descent > maxDescent)
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{
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maxDescent = descent;
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}
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int start = Math.Max(run.start, line.start);
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int end = Math.Min(run.end, line.end);
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var width = _characterPositions[end - 1].x + _characterWidths[end - 1] -
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_characterPositions[start].x;
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if (end > start)
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{
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var bounds = Rect.fromLTWH(0, -ascent,
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_characterPositions[end - 1].x + _characterWidths[end - 1] -
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_characterPositions[start].x,
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descent);
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_paintRecords.Add(new PaintRecord(run.style, new TextBlob(
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_text, start, end, _characterPositions, run.style, bounds),
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lineNumber, width));
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}
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}
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if (runIndex + 1 >= _runs.size)
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{
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break;
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}
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if (run.end < line.end)
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{
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runIndex++;
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}
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else
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{
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break;
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}
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}
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if (lineNumber == 0)
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{
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_alphabeticBaseline = maxAscent;
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_ideographicBaseline = maxAscent; // todo Properly implement ideographic_baseline
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}
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lastDescent = maxDescent;
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yOffset = Utils.PixelCorrectRound(yOffset + maxAscent + lastDescent);
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for (var charIndex = line.start; charIndex < line.end; charIndex++)
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{
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_characterPositions[charIndex].y = yOffset;
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}
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_lineHeights.Add((_lineHeights.Count == 0 ? 0 : _lineHeights[_lineHeights.Count - 1]) +
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Math.Round(maxAscent + maxDescent));
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}
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}
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private void computeLineBreak()
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{
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var newLinePositions = new List<int>();
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for (var i = 0; i < _text.Length; i++)
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{
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if (_text[i] == '\n')
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{
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newLinePositions.Add(i);
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}
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}
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newLinePositions.Add(_text.Length);
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var lineBreaker = new LineBreaker();
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lineBreaker.setup(_text, _runs, _width, _characterPositions, _characterWidths);
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for (var newlineIndex = 0; newlineIndex < newLinePositions.Count; ++newlineIndex)
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{
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var blockStart = newlineIndex > 0 ? newLinePositions[newlineIndex - 1] + 1 : 0;
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var blockEnd = newLinePositions[newlineIndex];
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var blockSize = blockEnd - blockStart;
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if (blockSize == 0)
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{
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_lineRanges.Add(new LineRange(blockStart, blockEnd, blockEnd, blockEnd + 1, true));
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_lineWidths.Add(0);
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continue;
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}
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lineBreaker.doBreak(blockStart, blockEnd);
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var lines = lineBreaker.getLines();
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for (int i = 0; i < lines.Count; ++i)
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{
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var line = lines[i];
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var end = i + 1 < lines.Count ? lines[i + 1].start : blockEnd;
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var nonSpaceEnd = end;
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while (nonSpaceEnd > line.start && isLineEndSpace(_text[nonSpaceEnd - 1]))
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{
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nonSpaceEnd--;
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}
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_lineRanges.Add(new LineRange(line.start, end, nonSpaceEnd, end + 1, end == blockEnd));
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_lineWidths.Add(line.width);
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}
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}
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return;
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}
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private double getLineXOffset(double lineTotalAdvance) {
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if (double.IsInfinity(_width))
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{
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return 0;
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}
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var align = _paragraphStyle.TextAlign;
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if (align == TextAlign.right) {
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return _width - lineTotalAdvance;
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} else if (align == TextAlign.center) {
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return Utils.PixelCorrectRound((_width - lineTotalAdvance) / 2);
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} else {
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return 0;
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}
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}
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private void justifyLine(int lineNumber, List<Range<int>> words)
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{
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if (words.Count <= 1)
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{
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return;
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}
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var line = _lineRanges[lineNumber];
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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 gapWidth = (_width - lineTotalAdvance) / (words.Count - 1);
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double justifyOffset = 0.0;
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foreach (var word in words)
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{
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offsetCharacters(new Vector2d(justifyOffset),
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_characterPositions, word.start, word.end);
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justifyOffset += gapWidth;
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justifyOffset = Utils.PixelCorrectRound(justifyOffset);
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}
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}
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private List<Range<int>> findWords(int start, int end)
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{
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var inWord = false;
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int wordStart = 0;
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List<Range<int>> words = new List<Range<int>>();
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for (int i = start; i < end; ++i) {
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bool isSpace = isWordSpace(_text[i]);
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if (!inWord && !isSpace) {
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wordStart = i;
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inWord = true;
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} else if (inWord && isSpace) {
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words.Add(new Range<int>(wordStart, i));
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inWord = false;
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}
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}
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if (inWord) {
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words.Add(new Range<int>(wordStart, end));
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}
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return words;
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}
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}
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}
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