ForcePressGestureRecognizer class

Recognizes a force press on devices that have force sensors.

Only the force from a single pointer is used to invoke events. A tap recognizer will win against this recognizer on pointer up as long as the pointer has not pressed with a force greater than ForcePressGestureRecognizer.startPressure. A long press recognizer will win when the press down time exceeds the threshold time as long as the pointer's pressure was never greater than ForcePressGestureRecognizer.startPressure in that duration.

As of November, 2018 iPhone devices of generation 6S and higher have force touch functionality, with the exception of the iPhone XR. In addition, a small handful of Android devices have this functionality as well.

Devices with faux screen pressure sensors like the Pixel 2 and 3 will not send any force press related callbacks.

Reported pressure will always be in the range 0.0 to 1.0, where 1.0 is maximum pressure and 0.0 is minimum pressure. If using a custom interpolation callback, the pressure reported will correspond to that custom curve.

Inheritance

Constructors

ForcePressGestureRecognizer({double startPressure = 0.4, double peakPressure = 0.85, GestureForceInterpolation interpolation = _inverseLerp, Object? debugOwner, Set<PointerDeviceKind>? supportedDevices, AllowedButtonsFilter allowedButtonsFilter = _defaultButtonAcceptBehavior})
Creates a force press gesture recognizer.

Properties

allowedButtonsFilter → AllowedButtonsFilter
Called when interaction starts. This limits the dragging behavior for custom clicks (such as scroll click). Its parameter comes from PointerEvent.buttons.
finalinherited
debugDescription → String
Returns a very short pretty description of the gesture that the recognizer looks for, like 'tap' or 'horizontal drag'.
no setteroverride
debugOwner → Object?
The recognizer's owner.
finalinherited
gestureSettings ↔ DeviceGestureSettings?
Optional device specific configuration for device gestures that will take precedence over framework defaults.
getter/setter pairinherited
hashCode → int
The hash code for this object.
no setterinherited
interpolation → GestureForceInterpolation
The function used to convert the raw device pressure values into a value in the range 0.0 to 1.0.
final
onEnd ↔ GestureForcePressEndCallback?
A pointer is no longer in contact with the screen.
getter/setter pair
onPeak ↔ GestureForcePressPeakCallback?
A pointer is in contact with the screen and has just pressed with a force exceeding the peakPressure. This is an arbitrary second level action threshold and isn't necessarily the maximum possible device pressure (which is 1.0).
getter/setter pair
onStart ↔ GestureForcePressStartCallback?
A pointer is in contact with the screen and has just pressed with a force exceeding the startPressure. Consequently, if there were other gesture detectors, only the force press gesture will be detected and all others will be rejected.
getter/setter pair
onUpdate ↔ GestureForcePressUpdateCallback?
A pointer is in contact with the screen and is either moving on the plane of the screen, pressing the screen with varying forces or both simultaneously.
getter/setter pair
peakPressure → double
The pressure of the press required to peak a force press.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
startPressure → double
The pressure of the press required to initiate a force press.
final
supportedDevices ↔ Set<PointerDeviceKind>?
The kind of devices that are allowed to be recognized as provided by supportedDevices in the constructor, or the currently deprecated kind. These cannot both be set. If both are null, events from all device kinds will be tracked and recognized.
getter/setter pairinherited
team ↔ GestureArenaTeam?
The team that this recognizer belongs to, if any.
getter/setter pairinherited

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.
override
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.
override
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.
inherited
handleEvent(PointerEvent event) → void
Called when a pointer event is routed to this recognizer.
override
handleNonAllowedPointer(PointerDownEvent event) → void
Handles a pointer being added that's not allowed by this recognizer.
inherited
handleNonAllowedPointerPanZoom(PointerPanZoomStartEvent event) → void
Handles a pointer pan/zoom being added that's not allowed by this recognizer.
inherited
invokeCallback<T>(String name, RecognizerCallback<T> callback, {String debugReport()?}) → T?
Invoke a callback provided by the application, catching and logging any exceptions.
inherited
isPointerAllowed(PointerDownEvent 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.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
rejectGesture(int pointer) → void
Called when this member loses the arena for the given pointer id.
override
resolve(GestureDisposition disposition) → void
Resolves this recognizer's participation in each gesture arena with the given disposition.
inherited
resolvePointer(int pointer, GestureDisposition disposition) → void
Resolves this recognizer's participation in the given gesture arena with the given disposition.
inherited
startTrackingPointer(int pointer, [Matrix4? transform]) → void
Causes events related to the given pointer ID to be routed to this recognizer.
inherited
stopTrackingIfPointerNoLongerDown(PointerEvent event) → void
Stops tracking the pointer associated with the given event if the event is a PointerUpEvent or a PointerCancelEvent event.
inherited
stopTrackingPointer(int pointer) → void
Stops events related to the given pointer ID from being routed to this recognizer.
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 brief description of this object, usually just the runtimeType and the hashCode.
inherited

Operators

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