toggleExpand method
void
toggleExpand()
Implementation
void toggleExpand() async {
if (!_isShow) await this._init();
if (this._histories.isEmpty) {
this._forceHide();
return;
}
this._clearFilter();
this.listOpen.sink.add(!_isShow);
this.listShow.add(!_isShow);
_isShow = !_isShow;
}