dispose method Null safety

  1. @override
void dispose()
override

Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener and removeListener will throw after the object is disposed).

This method should only be called by the object's owner.

Implementation

@override
void dispose() {
  if (ServicesBinding.instance!.keyEventManager.keyMessageHandler == _handleKeyMessage) {
    ServicesBinding.instance!.keyEventManager.keyMessageHandler = null;
    GestureBinding.instance!.pointerRouter.removeGlobalRoute(_handlePointerEvent);
  }
  super.dispose();
}