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Flutter & Dart · Concept

Widget tree

A Widget is an immutable description of part of a Flutter user interface. Flutter inflates it into an Element, which manages the underlying render tree; use StatefulWidget when mutable state is needed.

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Syntax

abstract class Widget extends DiagnosticableTree

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  • Element
  • StatefulWidget
  • State
  • BuildContext
  • StatelessWidget

Source: Widget class - widgets library - Dart API description. Checked 2026-11-03.