The Consumer widget has two main purposes: It allows obtaining a value from a provider when we don’t have a BuildContext that is a descendant of said provider, and therefore cannot use Provider.
Read moreHow do you use the selector in flutter?
Selector is a class in Provider package that is less known compare to Consumer yet useful. As the name suggests, Selector allows you to select a specific value in a Provider to listen to . Then when and only when that selected value changes, the widget that returns by the builder method of Selector will rebuild.16 Oca 2021
Read moreWhat is BuildContext Flutter?
BuildContext is a locator that is used to track each widget in a tree and locate them and their position in the tree . The BuildContext of each widget is passed to their build method. Remember that the build method returns the widget tree a widget renders. Each BuildContext is unique to a widget.
Read moreWhat is Updateshouldnotify in Flutter?
This method is called after rebuilds and always passes in the old widget as an argument . This gives you a chance to check if Flutter should rebuild or not. For example, if your new widget is rebuilt with the same data, then there’s no need to make Flutter do the expensive work.
Read moreWhy is the build () method on state and not Statefulwidgets?
Why is the build method on State, and not StatefulWidget? Putting a Widget build(BuildContext context) method on State rather than putting a Widget build(BuildContext context, State state) method on StatefulWidget gives developers more flexibility when subclassing StatefulWidget.
Read moreHow do I create a stateful widget?
To create a stateful widget in a flutter, use the createState() method . The stateful widget is the widget that describes part of a user interface by building a constellation of other widgets that represent a user interface more concretely. A stateful Widget means a widget that has a mutable state.
Read moreWhat is ephemeral state?
Ephemeral state (sometimes called UI state or local state) is the state you can neatly contain in a single widget .
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