ScrollAction class Null safety

An Action that scrolls the Scrollable that encloses the current primaryFocus by the amount configured in the ScrollIntent given to it.

If a Scrollable cannot be found above the current primaryFocus, the PrimaryScrollController will be considered for default handling of ScrollActions.

If Scrollable.incrementCalculator is null for the scrollable, the default for a ScrollIntent.type set to ScrollIncrementType.page is 80% of the size of the scroll window, and for ScrollIncrementType.line, 50 logical pixels.

Inheritance

Constructors

ScrollAction()

Properties

callingAction → Action<ScrollIntent>?
The Action overridden by this Action.
@protected, read-only, inherited
hashCode → int
The hash code for this object.
read-only, inherited
intentType → Type
Gets the type of intent this action responds to.
read-only, inherited
isActionEnabled → bool
Whether this Action is inherently enabled.
read-only, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited

Methods

addActionListener(ActionListenerCallback listener) → void
Register a callback to listen for changes to the state of this action.
@mustCallSuper, inherited
consumesKey(ScrollIntent intent) → bool
Indicates whether this action should treat key events mapped to this action as being "handled" when it is invoked via the key event.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
@mustCallSuper, @protected, inherited
invoke(ScrollIntent intent) → void
Called when the action is to be performed.
override
isEnabled(ScrollIntent intent) → bool
Returns true if the action is enabled and is ready to be invoked.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
notifyActionListeners() → void
Call all the registered listeners.
@protected, @visibleForTesting, inherited
removeActionListener(ActionListenerCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
@mustCallSuper, 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
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