Element class abstract

Undocumented public member.

Implemented types
Implementers
Available extensions

Constructors

Element(Widget widget)
Creates an element that uses the given widget as its configuration.

Properties

constraints → BoxConstraints?
The cached constraints from the last layout pass.
no setter
depth ↔ int
The depth of this element in the widget tree.
getter/setter pair
hashCode → int
The hash code for this object.
no setterinherited
isDirty ↔ bool
Undocumented public member.
getter/setter pair
layoutTraceId → int
Cached tracer ID for layout of this element.
no setter
mounted → bool
Whether this element is currently mounted in the tree.
no setter
owner ↔ BuildOwner?
The BuildOwner managing this element, resolving up the parent chain.
getter/setter pair
paintTraceId → int
Cached tracer ID for painting this element.
no setter
paintTraceMetadata → Map<String, String>?
Custom metadata for paint tracing.
no setter
parent ↔ Element?
The parent element in the widget tree.
getter/setter pair
rebuildTraceId → int
Cached tracer ID for rebuilding this element.
no setter
relativeOffset ↔ Offset
The cached local position assigned by the parent during layout.
getter/setter pair
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
size → Size
The resolved size of the element from the last layout pass.
no setter
treeDepth ↔ int
Undocumented public member.
getter/setter pair
widget ↔ Widget
The widget that this element represents.
getter/setter pairoverride-getter

Methods

dependOnInheritedWidgetOfExactType<T extends InheritedWidget>() → T?
Obtains the nearest inherited widget of the given type T.
override
getIntrinsicHeight(int width) → int
Returns the intrinsic height of this element.
getIntrinsicWidth(int height) → int
Returns the intrinsic width of this element.
hitTest(Point<int> globalPosition, [Offset parentOffset = Offset.zero]) → List<Element>

Available on Element, provided by the HitTestExtension extension

Recursively finds all elements containing the given global coordinate.
layout(BoxConstraints constraints) → Size
Calculates the size of the element based on the given constraints.
markNeedsBuild() → void
Marks this element as needing a build.
mount(Element? parent) → void
Adds this element to the tree as a child of parent.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
paint(Buffer buffer, Offset offset) → void
Paints the element and records tracing metrics.
performLayout(BoxConstraints constraints) → Size
Hook for subclasses to perform layout within the given constraints.
performPaint(Buffer buffer, Offset offset) → void
Hook for subclasses to implement actual painting.
performRebuild() → void
Performs the actual rebuild and clears the dirty flag.
reassemble() → void
Called during hot reload to invalidate the element and trigger a rebuild.
rebuild() → void
Rebuilds the element.
toString() → String
A string representation of this object.
inherited
unmount() → void
Removes this element from the tree.
update(Widget newWidget) → void
Updates this element to use a new Widget configuration.
visitChildren(void visitor(Element child)) → void
Invokes visitor on each child element of this node.

Operators

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