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@ -13,6 +13,7 @@ namespace Avalonia.Media.TextFormatting |
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private readonly TextParagraphProperties _paragraphProperties; |
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private readonly TextTrimming _textTrimming; |
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private readonly TextLine[] _textLines; |
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private readonly CachedMetrics _metrics = new(); |
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private int _textSourceLength; |
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@ -151,12 +152,95 @@ namespace Avalonia.Media.TextFormatting |
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=> _textLines; |
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/// <summary>
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/// Gets the bounds of the layout.
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/// The distance from the top of the first line to the bottom of the last line.
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/// </summary>
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/// <value>
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/// The bounds.
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/// </value>
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public Rect Bounds { get; private set; } |
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public double Height |
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{ |
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get |
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{ |
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return _metrics.Height; |
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} |
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} |
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/// <summary>
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/// The distance from the topmost black pixel of the first line
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/// to the bottommost black pixel of the last line.
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/// </summary>
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public double Extent |
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{ |
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get |
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{ |
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return _metrics.Extent; |
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} |
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} |
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/// <summary>
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/// The distance from the top of the first line to the baseline of the first line.
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/// </summary>
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public double Baseline |
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{ |
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get |
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{ |
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return _metrics.Baseline; |
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} |
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} |
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/// <summary>
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/// The distance from the bottom of the last line to the extent bottom.
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/// </summary>
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public double OverhangAfter |
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{ |
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get |
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{ |
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return _metrics.OverhangAfter; |
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} |
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} |
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/// <summary>
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/// The maximum distance from the leading black pixel to the leading alignment point of a line.
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/// </summary>
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public double OverhangLeading |
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{ |
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get |
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{ |
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return _metrics.OverhangLeading; |
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} |
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} |
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/// <summary>
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/// The maximum distance from the trailing black pixel to the trailing alignment point of a line.
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/// </summary>
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public double OverhangTrailing |
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{ |
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get |
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{ |
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return _metrics.OverhangTrailing; |
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} |
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} |
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/// <summary>
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/// The maximum advance width between the leading and trailing alignment points of a line,
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/// excluding the width of whitespace characters at the end of the line.
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/// </summary>
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public double Width |
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{ |
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get |
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{ |
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return _metrics.Width; |
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} |
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} |
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/// <summary>
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/// The maximum advance width between the leading and trailing alignment points of a line,
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/// including the width of whitespace characters at the end of the line.
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/// </summary>
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public double WidthIncludingTrailingWhitespace |
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{ |
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get |
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{ |
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return _metrics.WidthIncludingTrailingWhitespace; |
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} |
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} |
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/// <summary>
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/// Draws the text layout.
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@ -382,7 +466,7 @@ namespace Avalonia.Media.TextFormatting |
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var textPosition = characterHit.FirstCharacterIndex + characterHit.TrailingLength; |
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var isTrailing = lastTrailingIndex == textPosition && characterHit.TrailingLength > 0 || |
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y > Bounds.Bottom; |
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y > Height; |
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if (textPosition == textLine.FirstTextSourceIndex + textLine.Length) |
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{ |
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@ -422,41 +506,25 @@ namespace Avalonia.Media.TextFormatting |
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textRunStyle, textWrapping, lineHeight, 0, letterSpacing); |
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} |
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/// <summary>
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/// Updates the current bounds.
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/// </summary>
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/// <param name="textLine">The text line.</param>
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/// <param name="left">The current left.</param>
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/// <param name="width">The current width.</param>
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/// <param name="height">The current height.</param>
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private static void UpdateBounds(TextLine textLine, ref double left, ref double width, ref double height) |
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private TextLine[] CreateTextLines() |
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{ |
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var lineWidth = textLine.WidthIncludingTrailingWhitespace; |
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if (width < lineWidth) |
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{ |
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width = lineWidth; |
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} |
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var objectPool = FormattingObjectPool.Instance; |
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var start = textLine.Start; |
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var lineStartOfLongestLine = double.MaxValue; |
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var origin = new Point(); |
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var first = true; |
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if (left > start) |
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{ |
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left = start; |
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} |
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height += textLine.Height; |
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} |
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double accBlackBoxLeft, accBlackBoxTop, accBlackBoxRight, accBlackBoxBottom; |
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private TextLine[] CreateTextLines() |
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{ |
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var objectPool = FormattingObjectPool.Instance; |
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accBlackBoxLeft = accBlackBoxTop = double.MaxValue; |
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accBlackBoxRight = accBlackBoxBottom = double.MinValue; |
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if (MathUtilities.IsZero(MaxWidth) || MathUtilities.IsZero(MaxHeight)) |
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{ |
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var textLine = TextFormatterImpl.CreateEmptyTextLine(0, double.PositiveInfinity, _paragraphProperties); |
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Bounds = new Rect(0, 0, 0, textLine.Height); |
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UpdateMetrics(textLine, ref lineStartOfLongestLine, ref origin, ref first, |
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ref accBlackBoxLeft, ref accBlackBoxTop, ref accBlackBoxRight, ref accBlackBoxBottom); |
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return new TextLine[] { textLine }; |
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} |
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@ -465,8 +533,6 @@ namespace Avalonia.Media.TextFormatting |
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try |
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{ |
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double left = double.PositiveInfinity, width = 0.0, height = 0.0; |
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_textSourceLength = 0; |
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TextLine? previousLine = null; |
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@ -487,7 +553,8 @@ namespace Avalonia.Media.TextFormatting |
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textLines.Add(emptyTextLine); |
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UpdateBounds(emptyTextLine, ref left, ref width, ref height); |
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UpdateMetrics(emptyTextLine, ref lineStartOfLongestLine, ref origin, ref first, |
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ref accBlackBoxLeft, ref accBlackBoxTop, ref accBlackBoxRight, ref accBlackBoxBottom); |
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} |
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break; |
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@ -497,7 +564,7 @@ namespace Avalonia.Media.TextFormatting |
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//Fulfill max height constraint
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if (textLines.Count > 0 && !double.IsPositiveInfinity(MaxHeight) |
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&& height + textLine.Height > MaxHeight) |
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&& Height + textLine.Height > MaxHeight) |
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{ |
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if (previousLine?.TextLineBreak != null && _textTrimming != TextTrimming.None) |
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{ |
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@ -519,7 +586,8 @@ namespace Avalonia.Media.TextFormatting |
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textLines.Add(textLine); |
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UpdateBounds(textLine, ref left, ref width, ref height); |
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UpdateMetrics(textLine, ref lineStartOfLongestLine, ref origin, ref first, |
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ref accBlackBoxLeft, ref accBlackBoxTop, ref accBlackBoxRight, ref accBlackBoxBottom); |
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previousLine = textLine; |
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@ -528,7 +596,7 @@ namespace Avalonia.Media.TextFormatting |
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{ |
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if (textLine.TextLineBreak is { IsSplit: true }) |
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{ |
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textLines[textLines.Count - 1] = textLine.Collapse(GetCollapsingProperties(width)); |
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textLines[textLines.Count - 1] = textLine.Collapse(GetCollapsingProperties(WidthIncludingTrailingWhitespace)); |
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} |
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break; |
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@ -546,18 +614,17 @@ namespace Avalonia.Media.TextFormatting |
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textLines.Add(textLine); |
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UpdateBounds(textLine, ref left, ref width, ref height); |
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UpdateMetrics(textLine, ref lineStartOfLongestLine, ref origin, ref first, |
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ref accBlackBoxLeft, ref accBlackBoxTop, ref accBlackBoxRight, ref accBlackBoxBottom); |
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} |
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Bounds = new Rect(left, 0, width, height); |
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if (_paragraphProperties.TextAlignment == TextAlignment.Justify) |
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{ |
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var justificationWidth = MaxWidth; |
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if (_paragraphProperties.TextWrapping != TextWrapping.NoWrap) |
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{ |
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justificationWidth = width; |
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justificationWidth = WidthIncludingTrailingWhitespace; |
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} |
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if (justificationWidth > 0) |
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@ -582,6 +649,46 @@ namespace Avalonia.Media.TextFormatting |
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} |
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} |
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private void UpdateMetrics( |
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TextLine currentLine, |
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ref double lineStartOfLongestLine, |
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ref Point origin, |
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ref bool first, |
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ref double accBlackBoxLeft, |
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ref double accBlackBoxTop, |
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ref double accBlackBoxRight, |
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ref double accBlackBoxBottom) |
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{ |
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var blackBoxLeft = origin.X + currentLine.Start + currentLine.OverhangLeading; |
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var blackBoxRight = origin.X + currentLine.Start + currentLine.Width - currentLine.OverhangTrailing; |
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var blackBoxBottom = origin.Y + currentLine.Height + currentLine.OverhangAfter; |
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var blackBoxTop = blackBoxBottom - currentLine.Extent; |
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accBlackBoxLeft = Math.Min(accBlackBoxLeft, blackBoxLeft); |
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accBlackBoxRight = Math.Max(accBlackBoxRight, blackBoxRight); |
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accBlackBoxBottom = Math.Max(accBlackBoxBottom, blackBoxBottom); |
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accBlackBoxTop = Math.Min(accBlackBoxTop, blackBoxTop); |
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_metrics.OverhangAfter = currentLine.OverhangAfter; |
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_metrics.Height += currentLine.Height; |
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_metrics.Width = Math.Max(_metrics.Width, currentLine.Width); |
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_metrics.WidthIncludingTrailingWhitespace = Math.Max(_metrics.WidthIncludingTrailingWhitespace, currentLine.WidthIncludingTrailingWhitespace); |
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lineStartOfLongestLine = Math.Min(lineStartOfLongestLine, currentLine.Start); |
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_metrics.Extent = accBlackBoxBottom - accBlackBoxTop; |
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_metrics.OverhangLeading = accBlackBoxLeft - lineStartOfLongestLine; |
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_metrics.OverhangTrailing = _metrics.Width - (accBlackBoxRight - lineStartOfLongestLine); |
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if (first) |
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{ |
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_metrics.Baseline = currentLine.Baseline; |
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first = false; |
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} |
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origin = origin.WithY(origin.Y + currentLine.Height); |
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} |
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/// <summary>
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/// Gets the <see cref="TextCollapsingProperties"/> for current text trimming mode.
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/// </summary>
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@ -605,5 +712,24 @@ namespace Avalonia.Media.TextFormatting |
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line.Dispose(); |
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} |
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} |
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private class CachedMetrics |
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{ |
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// vertical
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public double Height; |
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public double Baseline; |
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// horizontal
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public double Width; |
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public double WidthIncludingTrailingWhitespace; |
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// vertical bounding box metrics
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public double Extent; |
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public double OverhangAfter; |
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// horizontal bounding box metrics
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public double OverhangLeading; |
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public double OverhangTrailing; |
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} |
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} |
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} |
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Benedikt Stebner
3 years ago
