getLineHeight method
Implementation
double getLineHeight(bool isHighlight, int index) {
if (metrics.isEmpty || index < 0 || index >= metrics.length) return 0;
final mainHeight =
isHighlight ? metrics[index].activeHeight : metrics[index].height;
if (metrics[index].translationHeight == 0) {
return mainHeight;
}
return mainHeight +
metrics[index].translationHeight +
style.translationLineGap;
}