MultiDragGestureRecognizer<T extends MultiDragPointerState> class

Recognizes movement on a per-pointer basis.

In contrast to DragGestureRecognizer, MultiDragGestureRecognizer watches each pointer separately, which means multiple drags can be recognized concurrently if multiple pointers are in contact with the screen.

MultiDragGestureRecognizer is not intended to be used directly. Instead, consider using one of its subclasses to recognize specific types for drag gestures.

See also:

Implemented by


MultiDragGestureRecognizer({@required Object debugOwner })
Initialize the object.


onStart GestureMultiDragStartCallback
Called when this class recognizes the start of a drag gesture. [...]
read / write
debugDescription String
Returns a very short pretty description of the gesture that the recognizer looks for, like 'tap' or 'horizontal drag'.
read-only, inherited
debugOwner Object
The recognizer's owner. [...]
final, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


acceptGesture(int pointer) → void
Called when this member wins the arena for the given pointer id.
addPointer(PointerDownEvent event) → void
Registers a new pointer that might be relevant to this gesture detector. [...]
createNewPointerState(PointerDownEvent event) → T
Subclasses should override this method to create per-pointer state objects to track the pointer associated with the given event.
dispose() → void
Releases any resources used by the object. [...]
rejectGesture(int pointer) → void
Called when this member loses the arena for the given pointer id.
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
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. [...]
@pragma('vm:entry-point'), inherited
toDiagnosticsNode({String name, DiagnosticsTreeStyle style }) DiagnosticsNode
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this object.
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this node and its descendants. [...]
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a one-line detailed description of the object. [...]
toStringShort() String


operator ==(dynamic other) bool
The equality operator. [...]