flutter Widget Element

May 29, 2023

Element # abstract class Element extends DiagnosticableTree implements BuildContext package:flutter/src/widgets/framework.dart An instantiation of a [Widget] at a particular location in the tree. – 在树里的特定位置上的一个Widget的实例。 Widgets describe how to configure a subtree but the same widget can be used to configure multiple subtrees simultaneously because widgets are immutable. An [Element] represents the use of a widget to configure a specific location in the tree. Over time, the widget associated with a given element can change, for example, if the parent widget rebuilds and creates a new widget for this location. ...