Element class abstract

A node in the widget tree, analogous to Flutter's Element.

Elements represent the instantiation of a Widget at a particular location in the tree. They manage the lifecycle and state of their associated widget.

Implementers

Constructors

Element(Widget widget)
Creates an Element for the given widget.

Properties

dirty ↔ bool
Whether this element has been marked as needing to be rebuilt.
getter/setter pair
hashCode → int
The hash code for this object.
no setterinherited
parent → Element?
The parent of this element in the tree, or null if this is the root.
no setter
renderObject → RenderObject?
The RenderObject associated with this element, if any.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
widget ↔ Widget
The current configuration of this element.
getter/setter pair

Methods

dependOnInheritedWidgetOfExactType<T extends InheritedWidget>() → T?
Obtains the nearest InheritedWidget of type T and registers this element as a dependent so it rebuilds when the inherited widget changes.
findAncestorElementOfExactType<T extends InheritedWidget>() → InheritedElement?
Returns the nearest InheritedElement of type T.
findAncestorWidgetOfExactType<T extends Widget>() → T?
Returns the nearest ancestor widget of the given type T.
markNeedsBuild() → void
Marks this element as needing to be rebuilt in the next frame.
mount(Element? parent) → void
Adds this element to the tree at the given parent.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited
unmount() → void
Removes this element from the tree and releases resources.
update(Widget newWidget) → void
Updates the widget configuration to newWidget.
updateChild(Element? child, Widget newWidget) → Element?
Updates the given child to use the given newWidget, returning the updated or newly created child element.
visitChildren(void visitor(Element e)) → void
Calls visitor for each direct child of this element.

Operators

operator ==(Object other) → bool
The equality operator.
inherited