SliverLayoutBuilder class Null safety
Builds a sliver widget tree that can depend on its own SliverConstraints.
Similar to the LayoutBuilder widget except its builder should return a sliver widget, and SliverLayoutBuilder is itself a sliver. The framework calls the builder function at layout time and provides the current SliverConstraints. The SliverLayoutBuilder's final SliverGeometry will match the SliverGeometry of its child.
The builder function is called in the following situations:
- The first time the widget is laid out.
- When the parent widget passes different layout constraints.
- When the parent widget updates this widget.
- When the dependencies that the builder function subscribes to change.
The builder function is not called during layout if the parent passes the same constraints repeatedly.
See also:
- LayoutBuilder, the non-sliver version of this widget.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- RenderObjectWidget
- ConstrainedLayoutBuilder<
SliverConstraints> - SliverLayoutBuilder
Constructors
- SliverLayoutBuilder({Key? key, required Widget builder(BuildContext, SliverConstraints)})
-
Creates a sliver widget that defers its building until layout.
const
Properties
- builder → SliverLayoutWidgetBuilder
-
Called at layout time to construct the widget tree.
read-onlyoverride
- hashCode → int
- The hash code for this object.
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
Methods
-
createElement(
) → RenderObjectElement -
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
-
createRenderObject(
BuildContext context) → RenderObject -
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.protected">@protectedinherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
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.
protected">@protectedinherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent 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}) → 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 RenderObject 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.
protected">@protectedinherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
nonVirtual">@nonVirtualinherited