showLoadingEntry method
显示Loading Entry
Implementation
void showLoadingEntry(OverlayEntry entry) {
final overlay = _getOverlay();
if (overlay == null) {
Log.console('ComLoading: 无法找到可用的Overlay');
return;
}
// 如果已经有Loading在显示,直接返回
if (_isLoadingShowing) return;
_isLoadingShowing = true;
_loadingEntry = entry;
overlay.insert(entry);
}