SubMemoized<T> class
Caches the instance of a complex object.
SubMemoized will immediately call create on first call and store its result. Inside of builder, the previously created instance is provided. The provided value will stay persistent over rebuilds.
A rebuild of SubMemoized with different keys will call create again to create a new instance.
This Widget is just a wrapper around SubValue with less parameters to ease a transition from React Hooks. See also:
- SubValue for more complex states
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- SubValue<
T> - SubMemoized
Constructors
-
SubMemoized({required SubValueCreate<
T> create, required SubValueBuild<T> builder, SubValueKeys? keys}) - Caches the instance of a complex object.
Properties
-
builder
→ SubValueBuild<
T> -
Creates the child of this Widget with the value.
finalinherited
-
create
→ SubValueBuilderCreate<
T> -
Creates the value. Called at least once and everytime keys changes.
finalinherited
-
dispose
→ SubValueBuilderDispose<
T> ? -
Disposes the value. Called before recreation and when disposing. Useful for Listeners, etc.
finalinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- keys → SubValueBuilderKeys?
-
Used to decide when to recreate the value. If null, the value is never recreated.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
update
→ SubValueBuilderUpdate<
T> ? -
Updates the value. Called every build. If null, does nothing.
In the call order, this comes after recreating the value.
finalinherited
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< SubValue< T> > -
Creates the mutable state for this widget at a given location in the tree.
inherited
-
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.
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}) → 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
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited