Base class for stateful widgets that have exactly one inflated instance in the tree.
Such widgets must be given a GlobalKey. This key can be generated by the
subclass from its Type object, e.g. by calling super(key: new
GlobalObjectKey(MyWidget)) where MyWidget is the name of the subclass.
Since only one instance can be inflated at a time, there is only ever one corresponding State object. That object is exposed, for convenience, via the currentState property.
When subclassing UniqueWidget, provide the corresponding State subclass as the type argument.
- Inheritance
- Object
- Widget
- StatefulWidget
- UniqueWidget
Constructors
- UniqueWidget({@required GlobalKey<T> key })
-
Creates a widget that has exactly one inflated instance in the tree.
Properties
- currentState → T
-
The state for the unique inflated instance of this widget.
read-only - hashCode → int
-
Get a hash code for this object.
read-only, inherited - key → Key
-
Controls how one widget replaces another widget in the tree.
read-only, inherited - runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Operators
-
operator ==(
other) → bool -
The equality operator.
inherited
Methods
-
createState(
) → T -
Creates the mutable state for this widget at a given location in the tree.
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited -
debugFillDescription(
List<String> description) → void -
Add additional information to the given description for use by toString.
inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited -
toString(
) → String -
Returns a string representation of this object.
inherited -
toStringShort(
) → String -
A short, textual description of this widget.
inherited