SlottedMultiChildRenderObjectWidgetMixin<S> mixin
Null safety
A mixin for a RenderObjectWidget that configures a RenderObject subclass, which organizes its children in different slots.
Implementers of this mixin have to provide the list of available slots by
overriding slots. The list of slots must never change for a given class
implementing this mixin. In the common case, Enum values are used as slots
and slots is typically implemented to return the value of the enum's
values
getter.
Furthermore, childForSlot must be implemented to return the current widget configuration for a given slot.
The RenderObject returned by createRenderObject and updated by updateRenderObject must implement the SlottedContainerRenderObjectMixin.
The type parameter S
is the type for the slots to be used by this
RenderObjectWidget and the RenderObject it configures. In the typical
case, S
is an Enum type.
flutter create --sample=widgets.SlottedMultiChildRenderObjectWidgetMixin.1 mysample
See also:
- MultiChildRenderObjectWidget, which configures a RenderObject with a single list of children.
- ListTile, which uses SlottedMultiChildRenderObjectWidgetMixin in its internal (private) implementation.
- Superclass Constraints
Properties
-
slots
→ Iterable<
S> -
Returns a list of all available slots.
protected">@protectedread-only
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- hashCode → int
- The hash code for this object.
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
Methods
-
childForSlot(
S slot) → Widget? -
Returns the widget that is currently occupying the provided
slot
.protected">@protected -
createElement(
) → SlottedRenderObjectElement< S> -
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
override
-
createRenderObject(
BuildContext context) → SlottedContainerRenderObjectMixin< S> -
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 SlottedContainerRenderObjectMixin< S> 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.
nonVirtual">@nonVirtualinherited