DecoratedSliver class

A sliver widget that paints a Decoration either before or after its child paints.

Unlike DecoratedBox, this widget expects its child to be a sliver, and must be placed in a widget that expects a sliver.

If the child sliver has infinite SliverGeometry.scrollExtent, then we only draw the decoration down to the bottom SliverGeometry.cacheExtent, and it is necessary to ensure that the bottom border does not creep above the top of the bottom cache. This can happen if the bottom has a border radius larger than the extent of the cache area.

Commonly used with BoxDecoration.

The child is not clipped. To clip a child to the shape of a particular ShapeDecoration, consider using a ClipPath widget.

This sample shows a radial gradient that draws a moon on a night sky:
link

To create a local project with this code sample, run:
flutter create --sample=widgets.DecoratedSliver.1 mysample

See also:

Inheritance

Constructors

DecoratedSliver({Key? key, required Decoration decoration, DecorationPosition position = DecorationPosition.background, Widget? sliver})
Creates a widget that paints a Decoration.
const

Properties

child → Widget?
The widget below this widget in the tree.
finalinherited
decoration → Decoration
What decoration to paint.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
position → DecorationPosition
Whether to paint the box decoration behind or in front of the child.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → SingleChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
createRenderObject(BuildContext context) → RenderDecoratedSliver
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
override
didUnmountRenderObject(covariant RenderObject renderObject) → void
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited
updateRenderObject(BuildContext context, covariant RenderDecoratedSliver renderObject) → void
Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject.
override

Operators

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