VerticalDragGestureRecognizer class
Recognizes movement in the vertical direction.
Used for vertical scrolling.
See also:
- HorizontalDragGestureRecognizer, for a similar recognizer but for horizontal movement.
- MultiDragGestureRecognizer, for a family of gesture recognizers that track each touch point independently.
- Inheritance
- Object
- GestureArenaMember
- GestureRecognizer
- OneSequenceGestureRecognizer
- DragGestureRecognizer
- VerticalDragGestureRecognizer
Constructors
- VerticalDragGestureRecognizer({Object debugOwner })
- 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
- 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 and might begin to move. [...]
read / write, inherited
- onEnd ↔ GestureDragEndCallback
-
A pointer that was previously in contact with the screen 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 and has begun to move. [...]
read / write, inherited
- onUpdate ↔ GestureDragUpdateCallback
-
A pointer that is in contact with the screen 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
Methods
-
acceptGesture(
int pointer) → void -
Called when this member wins the arena for the given pointer id.
inherited
-
addPointer(
PointerEvent 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
-
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
-
handleEvent(
PointerEvent event) → void -
Called when a pointer event is routed to 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. [...]
@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
-
startTrackingPointer(
int pointer) → 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 toStringDeep. [...]
inherited
-
toString(
{DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String -
Returns 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 ==(
dynamic other) → bool -
The equality operator. [...]
inherited