Stateless & stateful widgets
In this lesson, stateless & stateful widgets are discussed in detail.
We'll cover the following
Stateless widget
- A
Stateless
widget is immutable. Once it’s created, it can’t be changed. It doesn’t preserve its state. - Stateless widget is drawn only once, and it can not be redrawn at a later time.
- Stateless widget’s
build()
method is called only once.
Let’s use the Container
widget to understand creating a custom StatelessWidget
.
Container Widget: A container widget is a convenience widget that combines common painting, positioning, and sizing widgets.
The following code snippet demonstrates how a Container
widget is created in a stateless manner. This widget is created only once.
class MyStatelessWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Container();
}
}
-
Few examples of
Stateless
widgets are below. Once they are created, their value can’t be changed. If the value of the stateless widget needs to be changed then new widgets need to be created with the updated value. -
Some of the examples of
Stateless
widgets are below.Stateless
widgets don’t keep track of their state.
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