goBack method
void
goBack()
Implementation
void goBack() {
widget.controller?.play();
animationController!.stop();
if (this.lastShowing == null) {
widget.storyItems.last!.shown = false;
}
if (this.lastShowing == widget.storyItems.first) {
beginPlay();
} else {
this.lastShowing!.shown = false;
int lastPos = widget.storyItems.indexOf(this.lastShowing);
final previous = widget.storyItems[lastPos - 1]!;
previous.shown = false;
beginPlay();
}
}