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

See also:

  • Listener, a similar widget that tracks pointer events when the pointer has buttons pressed.


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.


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.
hashCode int
The hash code for this object.
@nonVirtual, read-only, inherited
hitTestBehavior HitTestBehavior?
How to behave during hit testing.
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.
onExit PointerExitEventListener?
Triggered when a mouse pointer has exited this widget when the widget is still mounted.
onHover PointerHoverEventListener?
Triggered when a pointer moves into a position within this widget without buttons pressed.
opaque bool
Whether this widget should prevent other MouseRegions visually behind it from detecting the pointer.
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


createElement() SingleChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
createRenderObject(BuildContext context) RenderMouseRegion
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.
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.
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.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
toString({DiagnosticLevel minLevel =}) String
A string representation of this object.
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants.
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object.
toStringShort() String
A short, textual description of this widget.
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.


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