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Remove irrelevant comment in TextPainter (#144308)
This PR removes an irrelevant comment in `TextPainter` for `_computePaintOffsetFraction`. Also some typos are corrected and missing spaces/newlines added. test-exempt: no functional change
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@ -331,10 +331,10 @@ class _TextLayout {
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/// (text.length, downstream), unless maxLines is set to a non-null value, in
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/// which case the caret is placed at the visual end of the last visible line.
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///
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/// This should not be called when the paragraph is emtpy as the implementation
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/// This should not be called when the paragraph is empty as the implementation
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/// relies on line metrics.
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///
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/// When the last bidi level run in the paragraph and the parargraph's bidi
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/// When the last bidi level run in the paragraph and the paragraph's bidi
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/// levels have opposite parities (which implies opposite writing directions),
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/// this makes sure the caret is placed at the same "end" of the line as if the
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/// line ended with a line feed.
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@ -1045,6 +1045,7 @@ class TextPainter {
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}
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ui.Paragraph _getOrCreateLayoutTemplate() => _layoutTemplate ??= _createLayoutTemplate();
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/// The height of a space in [text] in logical pixels.
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///
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/// Not every line of text in [text] will have this height, but this height
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@ -1305,8 +1306,6 @@ class TextPainter {
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return isLowSurrogate(prevCodeUnit) ? offset - 2 : offset - 1;
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}
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// Get the caret metrics (in logical pixels) based off the trailing edge of the
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// character upstream from the given string offset.
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static double _computePaintOffsetFraction(TextAlign textAlign, TextDirection textDirection) {
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return switch ((textAlign, textDirection)) {
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(TextAlign.left, _) => 0.0,
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@ -1327,7 +1326,7 @@ class TextPainter {
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final _LineCaretMetrics? caretMetrics = _computeCaretMetrics(position);
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if (caretMetrics == null) {
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final double paintOffsetAlignment = _computePaintOffsetFraction(textAlign, textDirection!);
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final double paintOffsetAlignment = _computePaintOffsetFraction(textAlign, textDirection!);
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// The full width is not (width - caretPrototype.width), because
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// RenderEditable reserves cursor width on the right. Ideally this
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// should be handled by RenderEditable instead.
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@ -1357,8 +1356,10 @@ class TextPainter {
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final TextBox textBox = _getOrCreateLayoutTemplate().getBoxesForRange(0, 1, boxHeightStyle: ui.BoxHeightStyle.strut).single;
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return textBox.toRect().height;
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}
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bool _isNewlineAtOffset(int offset) => 0 <= offset && offset < plainText.length
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&& WordBoundary._isNewline(plainText.codeUnitAt(offset));
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// Cached caret metrics. This allows multiple invokes of [getOffsetForCaret] and
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// [getFullHeightForCaret] in a row without performing redundant and expensive
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// get rect calls to the paragraph.
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@ -1464,7 +1465,7 @@ class TextPainter {
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.getBoxesForRange(graphemeRange.start, graphemeRange.end, boxHeightStyle: ui.BoxHeightStyle.strut);
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if (boxes.isNotEmpty) {
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final TextBox box = boxes.single;
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metrics =_LineCaretMetrics(
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metrics = _LineCaretMetrics(
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offset: Offset(anchorToLeadingEdge ? box.start : box.end, box.top),
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writingDirection: box.direction,
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);
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