getLabelHeight method
The height of the label (handles labels spanning multiple lines).
Implementation
double getLabelHeight(Iterable<TextElement> labelElements) {
if (labelElements.isEmpty) return 0;
final textHeight = labelElements.first.measurement.verticalSliceWidth;
final numLines = labelElements.length;
return (textHeight * numLines) + (multiLineLabelPadding * (numLines - 1));
}