RenderObjectElement class abstract

Base for elements that own a RenderObject.

Inheritance

• Object
• Element
• RenderObjectElement

Implementers

• LeafRenderObjectElement
• MultiChildRenderObjectElement
• SingleChildRenderObjectElement

Available extensions

• FleuryThemeContext
• NavigatorContext

Constructors

RenderObjectElement(RenderObjectWidget widget)

Properties

colors → ColorScheme

Available on BuildContext, provided by the FleuryThemeContext extension

Shorthand for Theme.of(this).colorScheme. Establishes a dependency on the same scope — equivalent to theme.colorScheme.

no setter

depth → int

no setter, inherited

dirty → bool

no setter, inherited

elementParent → Element?

The element this one was mounted under, or null for the root.

no setter, inherited

hashCode → int

The hash code for this object.

no setter, inherited

maybeRenderObject → RenderObject?

The render object, or null when this element never mounted one — an inflate whose createRenderObject threw, say.

no setter

mounted → bool

True while the underlying element is in the tree.

no setter, inherited

navigator → NavigatorState

Available on BuildContext, provided by the NavigatorContext extension

The nearest NavigatorState.

no setter

owner → BuildOwner

no setter, inherited

renderObject → RenderObject

The render object created by this element.

no setter

rootNavigator → NavigatorState

Available on BuildContext, provided by the NavigatorContext extension

The app's root NavigatorState.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

theme → ThemeData

Available on BuildContext, provided by the FleuryThemeContext extension

Shorthand for Theme.of(this). Establishes a dependency.

no setter

widget → RenderObjectWidget

The widget currently mounted at this location.

no setter, override

Methods

activate() → void

Subclass hook mirroring State.activate; the default is a no-op.

inherited

activeChildOrNull(Element? child) → Element?

child if it is still this element's active child, else null.

inherited

attachRenderObject() → void

Reattaches the render objects at the top of this subtree to the nearest ancestor render object. Inverse of detachRenderObject.

override

deactivate() → void

Subclass hook mirroring State.deactivate; the default is a no-op.

inherited

detachRenderObject() → void

Detaches the render objects at the top of this subtree from the ancestor render object. The default walks down through child elements; RenderObjectElement overrides it to detach its own render object and stop (the subtree below that render object travels with it).

override

findAncestorStateOfType<T extends State<StatefulWidget>>() → T?

Walks ancestors looking for an Element whose state is of type T. Does not establish a dependency.

inherited

findRenderObject() → RenderObject?

Walks down through component elements until a render-object element is found, returning that render object (or null when this context isn't mounted or has no render-object descendant). Does not establish a dependency.

inherited

forgetChild(Element child) → void

Called on this element's current parent when the element is being reclaimed by a different parent (via a GlobalKey move) while still active. The parent drops its reference so it won't later try to update or unmount a child that has moved away. The default is a no-op (leaf elements hold no children); container elements override it.

inherited

inflateWidget(Widget newWidget) → Element

Creates an element for newWidget and mounts it under this element.

inherited

insertChildRenderObject(RenderObject child, RenderObjectElement element) → void

Subclasses that hold children override this to install child into their own render object. Default throws; leaves don't hold children.

listen<T extends Listenable>(T source) → T

Observes source during this widget's build and returns the same object.

inherited

markNeedsBuild() → void

Marks this element as needing a rebuild on the next flush.

inherited

mount(Element? parent) → void

Inserts this element into the tree at the given parent.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

performRebuild() → void

Subclasses do the actual rebuild work here. The framework clears the dirty bit BEFORE calling this method.

inherited

pop([Object? result]) → void

Available on BuildContext, provided by the NavigatorContext extension

Pops the current screen with an optional result, ignoring PopScope (see NavigatorState.pop).

popToRoot() → void

Available on BuildContext, provided by the NavigatorContext extension

Pops every screen above the root.

popUntil<T extends Widget>() → void

Available on BuildContext, provided by the NavigatorContext extension

Pops until the top screen is a T.

present<T>(Widget screen, {Alignment alignment = Alignment.center, RouteTransition? transition, Color? barrierColor, bool barrierDismissible = true}) → Future<T?>

Available on BuildContext, provided by the NavigatorContext extension

Presents screen as a modal over the current screen (centered by default), on an opaque fill. Dismiss with pop. barrierColor fills the surround; barrierDismissible (default true) controls Esc.

push<T>(Widget screen, {RouteTransition? transition}) → Future<T?>

Available on BuildContext, provided by the NavigatorContext extension

Pushes screen; awaits its pop result.

pushAndClear<T>(Widget screen, {RouteTransition? transition}) → Future<T?>

Available on BuildContext, provided by the NavigatorContext extension

Pushes screen and clears the stack beneath it (the reset idiom).

pushReplacement<T>(Widget screen, {RouteTransition? transition, Object? result}) → Future<T?>

Available on BuildContext, provided by the NavigatorContext extension

Replaces the current screen with screen (the login → home idiom).

rebuild({bool force = false}) → void

Performs a rebuild if the element is dirty.

override

rebuildDirtyDescendants() → void

Rebuilds the dirty elements below this one, shallowest first.

inherited

removeChildRenderObject(RenderObject child) → void

replaceChildWithError(Element? child, Object error, StackTrace stack) → Element?

Contains a child update that threw the way a thrown build is contained: reports error to BuildOwner.onBuildError and puts the owner's error widget in the slot child occupied.

inherited

runWithBuildTarget<T>(T fn()) → T

Runs fn with this element as the active build target (current), so listenables read inside it (context.listen, Animation.value) subscribe it for this build. Restores the previous target on the way out (stack discipline for nested builds). For any element that invokes a build callback — including outside the build phase (e.g. a layout-time builder).

inherited

scope<T>() → T

Reads the nearest Scope declared with type T and subscribes this widget to it.

inherited

toString() → String

A string representation of this object.

inherited

toStringDeep([String prefix = '']) → String

Multi-line indented dump of this subtree, one element per line. Intended for test failure messages — not for runtime logging.

inherited

toStringShallow() → String

One-line description of this element. Includes runtime type, the widget runtime type, and the key when present.

inherited

unmount() → void

Removes this element from the tree permanently.

override

update(covariant RenderObjectWidget newWidget) → void

Replaces the widget configuration backing this element.

override

updateChild(Element? child, Widget? newWidget) → Element?

Reconciles a single child slot.

inherited

visitChildren(void visitor(Element child)) → void

Visits each direct child element.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited