handleBuildPage method
Implementation
void handleBuildPage(Route route, Widget widget, BuildContext context) {
if (!_flutterPageMap.containsKey(route)) return;
_flutterPageMap.update(route, (value) {
//is not a new page
if (value.route != null && value.widget != null) return value;
FlutterPage page = _generatePage(route, widget, context);
_flutterPageCache[route] = page;
return page;
});
}