VerticalDragGestureRecognizer class Null safety

Recognizes movement in the vertical direction.

Used for vertical scrolling.

See also:

Inheritance

Constructors

VerticalDragGestureRecognizer({Object? debugOwner, @Deprecated('Migrate to supportedDevices. ' 'This feature was deprecated after v2.3.0-1.0.pre.') PointerDeviceKind? kind, Set<PointerDeviceKind>? supportedDevices})
Create a gesture recognizer for interactions in the vertical axis.

Properties

debugDescription String
Returns a very short pretty description of the gesture that the recognizer looks for, like 'tap' or 'horizontal drag'.
read-only, override
debugOwner Object?
The recognizer's owner.
final, inherited
dragStartBehavior DragStartBehavior
Configure the behavior of offsets passed to onStart.
read / write, inherited
gestureSettings DeviceGestureSettings?
Optional device specific configuration for device gestures that will take precedence over framework defaults.
read / write, inherited
hashCode int
The hash code for this object.
read-only, inherited
maxFlingVelocity double?
Fling velocity magnitudes will be clamped to this value.
read / write, inherited
minFlingDistance double?
The minimum distance an input pointer drag must have moved to to be considered a fling gesture.
read / write, inherited
minFlingVelocity double?
The minimum velocity for an input pointer drag to be considered fling.
read / write, inherited
onCancel GestureDragCancelCallback?
The pointer that previously triggered onDown did not complete.
read / write, inherited
onDown GestureDragDownCallback?
A pointer has contacted the screen with a primary button and might begin to move.
read / write, inherited
onEnd GestureDragEndCallback?
A pointer that was previously in contact with the screen with a primary button and moving is no longer in contact with the screen and was moving at a specific velocity when it stopped contacting the screen.
read / write, inherited
onStart GestureDragStartCallback?
A pointer has contacted the screen with a primary button and has begun to move.
read / write, inherited
onUpdate GestureDragUpdateCallback?
A pointer that is in contact with the screen with a primary button and moving has moved again.
read / write, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
team GestureArenaTeam?
The team that this recognizer belongs to, if any.
read / write, inherited
velocityTrackerBuilder GestureVelocityTrackerBuilder
Determines the type of velocity estimation method to use for a potential drag gesture, when a new pointer is added.
read / write, inherited

Methods

acceptGesture(int pointer) → void
Called when this member wins the arena for the given pointer id.
inherited
addAllowedPointer(PointerDownEvent event) → void
Registers a new pointer that's been checked to be allowed by this gesture recognizer.
inherited
addAllowedPointerPanZoom(PointerPanZoomStartEvent event) → void
Registers a new pointer pan/zoom that's been checked to be allowed by this gesture recognizer.
inherited
addPointer(PointerDownEvent event) → void
Registers a new pointer that might be relevant to this gesture detector.
inherited
addPointerPanZoom(PointerPanZoomStartEvent event) → void
Registers a new pointer pan/zoom that might be relevant to this gesture detector.
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
didStopTrackingLastPointer(int pointer) → void
Called when the number of pointers this recognizer is tracking changes from one to zero.
inherited
dispose() → void
Releases any resources used by the object.
inherited
getKindForPointer(int pointer) PointerDeviceKind
For a given pointer ID, returns the device kind associated with it.
@protected, inherited
handleEvent(PointerEvent event) → void
Called when a pointer event is routed to this recognizer.
inherited
handleNonAllowedPointer(PointerDownEvent event) → void
Handles a pointer being added that's not allowed by this recognizer.
@protected, inherited
handleNonAllowedPointerPanZoom(PointerPanZoomStartEvent event) → void
Handles a pointer pan/zoom being added that's not allowed by this recognizer.
@protected, inherited
invokeCallback<T>(String name, RecognizerCallback<T> callback, {String debugReport()?}) → T?
Invoke a callback provided by the application, catching and logging any exceptions.
@protected, inherited
isFlingGesture(VelocityEstimate estimate, PointerDeviceKind kind) bool
Determines if a gesture is a fling or not based on velocity.
override
isPointerAllowed(PointerEvent event) bool
Checks whether or not a pointer is allowed to be tracked by this recognizer.
inherited
isPointerPanZoomAllowed(PointerPanZoomStartEvent event) bool
Checks whether or not a pointer pan/zoom is allowed to be tracked by this recognizer.
@protected, inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
rejectGesture(int pointer) → void
Called when this member loses the arena for the given pointer id.
inherited
resolve(GestureDisposition disposition) → void
Resolves this recognizer's participation in each gesture arena with the given disposition.
@mustCallSuper, @protected, inherited
resolvePointer(int pointer, GestureDisposition disposition) → void
Resolves this recognizer's participation in the given gesture arena with the given disposition.
@mustCallSuper, @protected, inherited
startTrackingPointer(int pointer, [Matrix4? transform]) → void
Causes events related to the given pointer ID to be routed to this recognizer.
@protected, inherited
stopTrackingIfPointerNoLongerDown(PointerEvent event) → void
Stops tracking the pointer associated with the given event if the event is a PointerUpEvent or a PointerCancelEvent event.
@protected, inherited
stopTrackingPointer(int pointer) → void
Stops events related to the given pointer ID from being routed to this recognizer.
@protected, 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 brief description of this object, usually just the runtimeType and the hashCode.
inherited

Operators

operator ==(Object other) bool
The equality operator.
inherited