attachToRenderTree method Null safety
- BuildOwner owner,
- [RenderObjectToWidgetElement<
T> ? element]
Inflate this widget and actually set the resulting RenderObject as the child of container.
If element
is null, this function will create a new element. Otherwise,
the given element will have an update scheduled to switch to this widget.
Used by runApp to bootstrap applications.
Implementation
RenderObjectToWidgetElement<T> attachToRenderTree(BuildOwner owner, [ RenderObjectToWidgetElement<T>? element ]) {
if (element == null) {
owner.lockState(() {
element = createElement();
assert(element != null);
element!.assignOwner(owner);
});
owner.buildScope(element!, () {
element!.mount(null, null);
});
} else {
element._newWidget = this;
element.markNeedsBuild();
}
return element!;
}