A widget that calls callbacks in response to pointer events.

Rather than listening for raw pointer events, consider listening for higher-level gestures using GestureDetector.

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.

Inheritance

Constructors

Listener({Key key, PointerDownEventListener onPointerDown, PointerMoveEventListener onPointerMove, PointerUpEventListener onPointerUp, PointerCancelEventListener onPointerCancel, HitTestBehavior behavior: HitTestBehavior.deferToChild, Widget child })

Creates a widget that forwards point events to callbacks.

Properties

behavior HitTestBehavior

How to behave during hit testing.

final
onPointerCancel PointerCancelEventListener

Called when the input from a pointer that triggered an onPointerDown is no longer directed towards this receiver.

final
onPointerDown PointerDownEventListener

Called when a pointer comes into contact with the screen at this object.

final
onPointerMove PointerMoveEventListener

Called when a pointer that triggered an onPointerDown changes position.

final
onPointerUp PointerUpEventListener

Called when a pointer that triggered an onPointerDown is no longer in contact with the screen.

final
child Widget

The widget below this widget in the tree.

final, inherited
hashCode int

Get a hash code for this object.

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

Operators

operator ==(other) bool

The equality operator.

inherited

Methods

createRenderObject(BuildContext context) RenderPointerListener

Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.

debugFillDescription(List<String> description) → void

Add additional information to the given description for use by toString.

updateRenderObject(BuildContext context, RenderPointerListener 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.

createElement() SingleChildRenderObjectElement

RenderObjectWidgets always inflate to a RenderObjectElement subclass.

inherited
didUnmountRenderObject(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
toString() String

Returns a string representation of this object.

inherited
toStringShort() String

A short, textual description of this widget.

inherited