createState method
Creates the mutable state for this widget at a given location in the tree.
Subclasses should override this method to return a newly created instance of their associated State subclass:
@override
State<SomeWidget> createState() => _SomeWidgetState();
The framework can call this method multiple times over the lifetime of a StatefulWidget. For example, if the widget is inserted into the tree in multiple locations, the framework will create a separate State object for each location. Similarly, if the widget is removed from the tree and later inserted into the tree again, the framework will call createState again to create a fresh State object, simplifying the lifecycle of State objects.
Implementation
@override
_SomeCalendarPageState createState() => _SomeCalendarPageState(
startDate: startDate,
lastDate: lastDate,
onTapFunction: onTapFunction,
state: state,
mode: mode,
viewMode: viewMode,
primaryColor: primaryColor,
textColor: textColor);