Recognizes movement.
In contrast to MultiDragGestureRecognizer, DragGestureRecognizer recognizes a single gesture sequence for all the pointers it watches, which means that the recognizer has at most one drag sequence active at any given time regardless of how many pointers are in contact with the screen.
DragGestureRecognizer is not intended to be used directly. Instead, consider using one of its subclasses to recognize specific types for drag gestures.
See also:
- Inheritance
- Object
- GestureArenaMember
- GestureRecognizer
- OneSequenceGestureRecognizer
- DragGestureRecognizer
- Implemented by
Constructors
Properties
- onCancel → GestureDragCancelCallback
-
The pointer that previously triggered onDown did not complete.
read / write - onDown → GestureDragDownCallback
-
A pointer has contacted the screen and might begin to move.
read / write - 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 - onStart → GestureDragStartCallback
-
A pointer has contacted the screen and has begun to move.
read / write - onUpdate → GestureDragUpdateCallback
-
A pointer that is in contact with the screen and moving has moved again.
read / write - hashCode → int
-
Get a hash code for this object.
read-only, inherited - runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Operators
-
operator ==(
other) → bool -
The equality operator.
inherited
Methods
-
acceptGesture(
int pointer) → void -
Called when this member wins the arena for the given pointer id.
-
addPointer(
PointerEvent event) → void -
Registers a new pointer that might be relevant to this gesture detector.
-
didStopTrackingLastPointer(
int pointer) → void -
Called when the number of pointers this recognizer is tracking changes from one to zero.
-
dispose(
) → void -
Releases any resources used by the object.
-
handleEvent(
PointerEvent event) → void -
Called when a pointer event is routed to this recognizer.
-
rejectGesture(
int pointer) → void -
Called when this member loses the arena for the given pointer id.
-
invokeCallback(
String name, RecognizerCallback callback) → dynamic -
Invoke a callback provided by the application and log any exceptions.
inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited -
resolve(
GestureDisposition disposition) → void -
Resolves this recognizer's participation in each gesture arena with the given disposition.
inherited -
startTrackingPointer(
int pointer) → 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 -
toString(
) → String -
Returns a string representation of this object.
inherited -
toStringShort(
) → String -
Returns a very short pretty description of the gesture that the recognizer looks for, like 'tap' or 'horizontal drag'.
inherited