MouseRegionModifier class

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.

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

** See code in examples/api/lib/widgets/basic/mouse_region.0.dart ** {@end-tool}

See also:

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

Constructors

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

Properties

cursor → MouseCursor
The mouse cursor for mouse pointers that are hovering over the region.
final
hashCode → int
The hash code for this object.
no setterinherited
hitTestBehavior → HitTestBehavior?
How to behave during hit testing.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
modifierKey → Key?
The actual key of the widget, which Modifier wrapped
finalinherited
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.
no setterinherited

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
inherited
buildWithChild(BuildContext context, Widget? child) → Widget
A build method that receives an extra child parameter.
override
createElement() → SingleChildStatelessElement
Create a SingleChildStatelessElement
inherited
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
modified() → Modifier

Available on Widget, provided by the ModifierTransformer extension

Transform normal widget to Modifier
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