FocusTrap class Null safety

The FocusTrap widget removes focus when a mouse primary pointer makes contact with another region of the screen.

When a primary pointer makes contact with the screen, this widget determines if that pointer contacted an existing focused widget. If not, this asks the FocusScopeNode to reset the focus state. This allows TextFields and other focusable widgets to give up their focus state, without creating a gesture detector that competes with others on screen.

In cases where focus is conceptually larger than the focused render object, a FocusTrapArea can be used to expand the focus area to include all render objects below that. This is used by the TextField widgets to prevent a loss of focus when interacting with decorations on the text area.

See also:

  • FocusTrapArea, the widget that allows expanding the conceptual focus area.
Inheritance

Constructors

FocusTrap({required FocusScopeNode focusScopeNode, required Widget child, Key? key})
Create a new FocusTrap widget scoped to the provided focusScopeNode.
const

Properties

child → Widget?
The widget below this widget in the tree. [...]
final, inherited
focusScopeNode → FocusScopeNode
The focusScopeNode that this focus trap widget operates on.
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
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited

Methods

createElement() → SingleChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
createRenderObject(BuildContext context) → RenderObject
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget. [...]
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
didUnmountRenderObject(covariant RenderObject renderObject) → void
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
@protected, 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
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
updateRenderObject(BuildContext context, covariant RenderObject renderObject) → void
Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject. [...]
override

Operators

operator ==(Object other) → bool
The equality operator. [...]
@nonVirtual, inherited