LongPressGestureRecognizer class Null safety

Recognizes when the user has pressed down at the same location for a long period of time.

The gesture must not deviate in position from its touch down point for 500ms until it's recognized. Once the gesture is accepted, the finger can be moved, triggering onLongPressMoveUpdate callbacks, unless the postAcceptSlopTolerance constructor argument is specified.

LongPressGestureRecognizer may compete on pointer events of kPrimaryButton, kSecondaryButton, and/or kTertiaryButton if at least one corresponding callback is non-null. If it has no callbacks, it is a no-op.

Inheritance

Constructors

LongPressGestureRecognizer({Duration? duration, double? postAcceptSlopTolerance, @Deprecated('Migrate to supportedDevices. ' 'This feature was deprecated after v2.3.0-1.0.pre.') PointerDeviceKind? kind, Set<PointerDeviceKind>? supportedDevices, Object? debugOwner})
Creates a long-press gesture recognizer. [...]

Properties

deadline Duration?
If non-null, the recognizer will call didExceedDeadline after this amount of time has elapsed since starting to track the primary pointer. [...]
final, inherited
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
hashCode int
The hash code for this object. [...]
read-only, inherited
initialPosition OffsetPair?
The location at which the primary pointer contacted the screen. [...]
read-only, inherited
onLongPress GestureLongPressCallback?
Called when a long press gesture by a primary button has been recognized. [...]
read / write
onLongPressCancel GestureLongPressCancelCallback?
Called when a pointer that previously triggered onLongPressDown will not end up causing a long-press. [...]
read / write
onLongPressDown GestureLongPressDownCallback?
Called when a pointer has contacted the screen at a particular location with a primary button, which might be the start of a long-press. [...]
read / write
onLongPressEnd GestureLongPressEndCallback?
Called when the pointer stops contacting the screen after a long-press by a primary button. [...]
read / write
onLongPressMoveUpdate GestureLongPressMoveUpdateCallback?
Called when moving after the long press by a primary button is recognized. [...]
read / write
onLongPressStart GestureLongPressStartCallback?
Called when a long press gesture by a primary button has been recognized. [...]
read / write
onLongPressUp GestureLongPressUpCallback?
Called when the pointer stops contacting the screen after a long-press by a primary button. [...]
read / write
onSecondaryLongPress GestureLongPressCallback?
Called when a long press gesture by a secondary button has been recognized. [...]
read / write
onSecondaryLongPressCancel GestureLongPressCancelCallback?
Called when a pointer that previously triggered onSecondaryLongPressDown will not end up causing a long-press. [...]
read / write
onSecondaryLongPressDown GestureLongPressDownCallback?
Called when a pointer has contacted the screen at a particular location with a secondary button, which might be the start of a long-press. [...]
read / write
onSecondaryLongPressEnd GestureLongPressEndCallback?
Called when the pointer stops contacting the screen after a long-press by a secondary button. [...]
read / write
onSecondaryLongPressMoveUpdate GestureLongPressMoveUpdateCallback?
Called when moving after the long press by a secondary button is recognized. [...]
read / write
onSecondaryLongPressStart GestureLongPressStartCallback?
Called when a long press gesture by a secondary button has been recognized. [...]
read / write
onSecondaryLongPressUp GestureLongPressUpCallback?
Called when the pointer stops contacting the screen after a long-press by a secondary button. [...]
read / write
onTertiaryLongPress GestureLongPressCallback?
Called when a long press gesture by a tertiary button has been recognized. [...]
read / write
onTertiaryLongPressCancel GestureLongPressCancelCallback?
Called when a pointer that previously triggered onTertiaryLongPressDown will not end up causing a long-press. [...]
read / write
onTertiaryLongPressDown GestureLongPressDownCallback?
Called when a pointer has contacted the screen at a particular location with a tertiary button, which might be the start of a long-press. [...]
read / write
onTertiaryLongPressEnd GestureLongPressEndCallback?
Called when the pointer stops contacting the screen after a long-press by a tertiary button. [...]
read / write
onTertiaryLongPressMoveUpdate GestureLongPressMoveUpdateCallback?
Called when moving after the long press by a tertiary button is recognized. [...]
read / write
onTertiaryLongPressStart GestureLongPressStartCallback?
Called when a long press gesture by a tertiary button has been recognized. [...]
read / write
onTertiaryLongPressUp GestureLongPressUpCallback?
Called when the pointer stops contacting the screen after a long-press by a tertiary button. [...]
read / write
postAcceptSlopTolerance double?
The maximum distance in logical pixels the gesture is allowed to drift after the gesture has been accepted. [...]
final, inherited
preAcceptSlopTolerance double?
The maximum distance in logical pixels the gesture is allowed to drift from the initial touch down position before the gesture is accepted. [...]
final, inherited
primaryPointer int?
The ID of the primary pointer this recognizer is tracking. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
state GestureRecognizerState
The current state of the recognizer. [...]
read-only, inherited
team GestureArenaTeam?
The team that this recognizer belongs to, if any. [...]
read / write, inherited

Methods

acceptGesture(int pointer) → void
Called when this member wins the arena for the given pointer id.
override
addAllowedPointer(PointerDownEvent event) → void
Registers a new pointer 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
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
didExceedDeadline() → void
Override to be notified when deadline is exceeded. [...]
override
didExceedDeadlineWithEvent(PointerDownEvent event) → void
Same as didExceedDeadline but receives the event that initiated the gesture. [...]
@protected, 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. [...]
inherited
handlePrimaryPointer(PointerEvent event) → void
Override to provide behavior for the primary pointer when the gesture is still possible.
override
invokeCallback<T>(String name, RecognizerCallback<T> callback, {String debugReport()?}) → T?
Invoke a callback provided by the application, catching and logging any exceptions. [...]
@protected, inherited
isPointerAllowed(PointerDownEvent event) bool
Checks whether or not a pointer is allowed to be tracked by this recognizer.
override
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.
override
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