FocusDetector class

Fires callbacks every time the widget appears or disappears from the screen.

Inheritance

Constructors

FocusDetector({@required Widget child, VoidCallback onFocusGained, VoidCallback onFocusLost, VoidCallback onVisibilityGained, VoidCallback onVisibilityLost, VoidCallback onForegroundGained, VoidCallback onForegroundLost, Key key})
const

Properties

child Widget
The widget below this widget in the tree.
final
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
onFocusGained VoidCallback
Called when the widget becomes visible or enters foreground while visible.
final
onFocusLost VoidCallback
Called when the widget becomes invisible or enters background while visible.
final
onForegroundGained VoidCallback
Called when the app entered the foreground while the widget is visible.
final
onForegroundLost VoidCallback
Called when the app is sent to background while the widget was visible.
final
onVisibilityGained VoidCallback
Called when the widget becomes visible.
final
onVisibilityLost VoidCallback
Called when the widget becomes invisible.
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
createState() → _FocusDetectorState
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. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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
Returns 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. [...]
@nonVirtual, inherited