Widget class Null safety Widgets are the central class hierarchy in the Flutter framework . A widget is an immutable description of part of a user interface. Widgets can be inflated into elements, which manage the underlying render tree. Widgets themselves have no mutable state (all their fields must be final).
Read moreWhy we use inherited widget in Flutter?
The inherited widget works in conjunction with a stateful widget and allows you to pass that StatefulWidgets state to all of its ancestors . Its a convenience widget. So you don’t have to type the code in every class to pass state down to its children.
Read moreHow does an inherited widget work?
InheritedWidget is a base class that allows classes that extend it to propagate information down the tree efficiently. Basically, it works by notifying registered build contexts if there is any change . Therefore, the descendant widgets that depend on it will only be rebuilt if necessary.
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.
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