BaseGestureRecognizer

    • BaseGestureRecognizer serves as the foundation for gesture recognition in Sceneform, such as drag, pinch, and twist gestures.

    • It processes touch input to identify gesture starts and triggers corresponding events.

    • Developers can listen to gesture object events to track gesture updates and completion.

    • Gesture Recognizers are extended by concrete classes like DragGestureRecognizer , PinchGestureRecognizer , and TwistGestureRecognizer to handle specific user interactions.

    • BaseGestureRecognizer includes methods to add and remove gesture start listeners, as well as an abstract method tryCreateGestures to be implemented by subclasses for gesture creation logic.
    public abstract class BaseGestureRecognizer
    Known Direct Subclasses
    DragGestureRecognizer Gesture Recognizer for when the user performs a drag motion on the touch screen. 
    PinchGestureRecognizer Gesture Recognizer for when the user performs a two-finger pinch motion on the touch screen. 
    TwistGestureRecognizer Gesture Recognizer for when the user performs a two-finger twist motion on the touch screen. 

    Base class for all Gesture Recognizers (i.e. DragGestureRecognizer).

    A Gesture recognizer processes touch input to determine if a gesture should start and fires an event when the gesture is started.

    To determine when an gesture is finished/updated, listen to the events on the gesture object.

    Nested Classes

    interface
    BaseGestureRecognizer.OnGestureStartedListener <T extends  BaseGesture <T>>
    Interface definition for a callbacks to be invoked when a BaseGesture starts. 

    Fields

    protected final GesturePointersUtility gesturePointersUtility *
    protected final ArrayList <T extends  BaseGesture <T>> gestures *

    Public Constructors

    BaseGestureRecognizer ( GesturePointersUtility gesturePointersUtility)

    Public Methods

    void
    addOnGestureStartedListener ( OnGestureStartedListener <T> listener)
    void
    onTouch ( HitTestResult hitTestResult, MotionEvent motionEvent)
    void
    removeOnGestureStartedListener ( OnGestureStartedListener <T> listener)

    Protected Methods

    abstract void
    tryCreateGestures ( HitTestResult hitTestResult, MotionEvent motionEvent)

    Inherited Methods

    Fields

    protected final GesturePointersUtility gesturePointersUtility

    protected final ArrayList <T extends  BaseGesture <T>> gestures

    Public Constructors

    public BaseGestureRecognizer ( GesturePointersUtility gesturePointersUtility)

    Parameters
    gesturePointersUtility

    Public Methods

    public void addOnGestureStartedListener ( OnGestureStartedListener <T> listener)

    Parameters
    listener

    public void onTouch ( HitTestResult hitTestResult, MotionEvent motionEvent)

    Parameters
    hitTestResult
    motionEvent

    public void removeOnGestureStartedListener ( OnGestureStartedListener <T> listener)

    Parameters
    listener

    Protected Methods

    protected abstract void tryCreateGestures ( HitTestResult hitTestResult, MotionEvent motionEvent)

    Parameters
    hitTestResult
    motionEvent
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