FocusArea class

Focus area is required to provide listener for pointer up and down events and then trigger callbacks on FocusPointerDetector widgets when pointer enters the region of such widgets. This widget must be an ancestor of FocusPointerDetector and share same context. It should appear only once anywhere in the widget tree as an ancestor of FocusPointerDetector and it take just one required widget parameter which should contain FocusPointerDetector widgets.

As this widget is essentially a Listener, using listener widgets at any other point in the widget tree would lead to erratic behaviour.

Inheritance

Constructors

FocusArea.new({Key? key, required Widget child, dynamic onPointerDown()?, dynamic onPointerUp()?})
const

Properties

child → Widget
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onPointerDown → dynamic Function()?
This callback that can be set to be called after the pointer is down.
final
onPointerUp → dynamic Function()?
This callback that can be set to be called after the pointer is up.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<FocusArea>
Creates the mutable state for this widget at a given location in the tree.
override
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, int wrapWidth = 65}) → 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