MouseRegion class Null safety

A widget that tracks the movement of mice.

MouseRegion is used when it is needed to compare the list of objects that a mouse pointer is hovering over between this frame and the last frame. This means entering events, exiting events, and mouse cursors.

To listen to general pointer events, use Listener, or more preferably, GestureDetector.

Layout behavior

See BoxConstraints for an introduction to box layout models.

If it has a child, this widget defers to the child for sizing behavior. If it does not have a child, it grows to fit the parent instead.

This example makes a Container react to being entered by a mouse pointer, showing a count of the number of entries and exits.

To create a local project with this code sample, run:
flutter create --sample=widgets.MouseRegion.1 mysample

Constructors

MouseRegion({Key? key, PointerEnterEventListener? onEnter, PointerExitEventListener? onExit, PointerHoverEventListener? onHover, MouseCursor cursor = MouseCursor.defer, bool opaque = true, HitTestBehavior? hitTestBehavior, Widget? child}): Creates a widget that forwards mouse events to callbacks.
const

Properties

child → Widget?: The widget below this widget in the tree.
final, inherited
cursor → MouseCursor: The mouse cursor for mouse pointers that are hovering over the region.
final
hashCode → int: The hash code for this object.
@nonVirtual, read-only, inherited
hitTestBehavior → HitTestBehavior?: How to behave during hit testing.
final
key → Key?: Controls how one widget replaces another widget in the tree.
final, inherited
onEnter → PointerEnterEventListener?: Triggered when a mouse pointer has entered this widget.
final
onExit → PointerExitEventListener?: Triggered when a mouse pointer has exited this widget when the widget is still mounted.
final
onHover → PointerHoverEventListener?: Triggered when a pointer moves into a position within this widget without buttons pressed.
final
opaque → bool: Whether this widget should prevent other MouseRegions visually behind it from detecting the pointer.
final
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) → RenderMouseRegion: 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.
override
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 RenderMouseRegion 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

Flutter
widgets
MouseRegion class