previous method
void
previous()
Completes current active showcase and starts previous one otherwise will finish the entire showcase view
Implementation
void previous() {
if (ids != null && ((activeWidgetId ?? 0) - 1) >= 0 && mounted) {
setState(() {
_onComplete();
activeWidgetId = activeWidgetId! - 1;
_onStart();
if (activeWidgetId! >= ids!.length) {
_cleanupAfterSteps();
widget.onFinish?.call();
}
});
}
}