ToggleableStateMixin<S extends StatefulWidget> mixin Null safety

A mixin for StatefulWidgets that implement material-themed toggleable controls with toggle animations (e.g. Switches, Checkboxes, and Radios).

The mixin implements the logic for toggling the control (e.g. when tapped) and provides a series of animation controllers to transition the control from one state to another. It does not have any opinion about the visual representation of the toggleable widget. The visuals are defined by a CustomPainter passed to the buildToggleable. State objects using this mixin should call that method from their build method.

This mixin is used to implement the material components for Switch, Checkbox, and Radio controls.

Superclass Constraints
Annotations

Properties

positionController → AnimationController
Used by subclasses to manipulate the visual value of the control.
read-only
position → CurvedAnimation
The visual value of the control.
read-only
reactionController → AnimationController
Used by subclasses to control the radial reaction animation.
read-only
reaction → Animation<double>
The visual value of the radial reaction animation.
read-only
reactionHoverFade → Animation<double>
Controls the radial reaction's opacity animation for hover changes.
read-only
reactionFocusFade → Animation<double>
Controls the radial reaction's opacity animation for focus changes.
read-only
isInteractive → bool
Whether value of this control can be changed by user interaction.
read-only
onChanged → ValueChanged<bool?>?
Called when the control changes value.
read-only
value → bool?
False if this control is "inactive" (not checked, off, or unselected).
read-only
tristate → bool
If true, value can be true, false, or null, otherwise value must be true or false.
read-only
downPosition → Offset?
The most recent Offset at which a pointer touched the Toggleable.
read-only
states → Set<MaterialState>
Describes the current MaterialState of the Toggleable.
read-only
widget → S
The current configuration.
read-onlyinherited
context → BuildContext
The location in the tree where this widget builds.
read-onlyinherited
mounted → bool
Whether this State object is currently in a tree.
read-onlyinherited
hashCode → int
The hash code for this object.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

activate() → void
Called when this object is reinserted into the tree after having been removed via deactivate.
inherited
animateToValue() → void
Runs the position animation to transition the Toggleable's appearance to match value.
build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
protected">@protectedinherited
buildToggleable({FocusNode? focusNode, bool autofocus = false, required MaterialStateProperty<MouseCursor> mouseCursor, required Size size, required CustomPainter painter}) → Widget
Typically wraps a painter that draws the actual visuals of the Toggleable with logic to toggle it.
createTicker(TickerCallback onTick) → Ticker
Creates a ticker with the given callback.
inherited
deactivate() → void
Called when this object is removed from the tree.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
didChangeDependencies() → void
Called when a dependency of this State object changes.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
didUpdateWidget(covariant S oldWidget) → void
Called whenever the widget configuration changes.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
dispose() → void
Called when this object is removed from the tree permanently.
override
initState() → void
Called when this object is inserted into the tree.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
reassemble() → void
Called whenever the application is reassembled during debugging, for example during hot reload.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
setState(VoidCallback fn) → void
Notify the framework that the internal state of this object has changed.
protected">@protectedinherited
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
toStringShort() → String
A brief description of this object, usually just the runtimeType and the hashCode.
inherited

Operators

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