BaseGesture

    • BaseGesture is an abstract class serving as the foundation for gesture recognition in Sceneform, representing a sequence of touch events like dragging or pinching.

    • It is created and updated by BaseGestureRecognizer and offers subclasses such as DragGesture , PinchGesture , and TwistGesture for specific touch interactions.

    • Key methods include canStart , onStart , updateGesture , onFinish , and onCancel , which define the gesture lifecycle and behavior.

    • Developers can utilize the OnGestureEventListener interface to receive callbacks during various stages of a gesture's execution.

    • The targetNode field indicates the Sceneform node associated with the gesture, while gesturePointersUtility assists with managing touch points.
    public abstract class BaseGesture
    Known Direct Subclasses
    DragGesture Gesture for when the user performs a drag motion on the touch screen. 
    PinchGesture Gesture for when the user performs a two-finger pinch motion on the touch screen. 
    TwistGesture Gesture for when the user performs a two-finger twist motion on the touch screen. 

    Base class for a gesture.

    A gesture represents a sequence of touch events that are detected to represent a particular type of motion (i.e. Dragging, Pinching).

    Gestures are created and updated by BaseGestureRecognizer's.

    Nested Classes

    interface
    BaseGesture.OnGestureEventListener <T extends  BaseGesture <T>>
    Interface definition for callbacks to be invoked by a BaseGesture . 

    Fields

    protected final GesturePointersUtility gesturePointersUtility *
    protected Node targetNode *

    Public Constructors

    BaseGesture ( GesturePointersUtility gesturePointersUtility)

    Public Methods

    Node
    getTargetNode ()
    boolean
    hasFinished ()
    boolean
    hasStarted ()
    float
    inchesToPixels (float inches)
    boolean
    justStarted ()
    void
    onTouch ( HitTestResult hitTestResult, MotionEvent motionEvent)
    float
    pixelsToInches (float pixels)
    void
    setGestureEventListener ( OnGestureEventListener <T> listener)
    boolean
    wasCancelled ()

    Protected Methods

    abstract boolean
    canStart ( HitTestResult hitTestResult, MotionEvent motionEvent)
    void
    cancel ()
    void
    complete ()
    abstract T
    getSelf ()
    abstract void
    onCancel ()
    abstract void
    onFinish ()
    abstract void
    onStart ( HitTestResult hitTestResult, MotionEvent motionEvent)
    abstract boolean
    updateGesture ( HitTestResult hitTestResult, MotionEvent motionEvent)

    Inherited Methods

    Fields

    protected final GesturePointersUtility gesturePointersUtility

    protected Node targetNode

    Public Constructors

    public BaseGesture ( GesturePointersUtility gesturePointersUtility)

    Parameters
    gesturePointersUtility

    Public Methods

    public Node getTargetNode ()

    public boolean hasFinished ()

    public boolean hasStarted ()

    public float inchesToPixels (float inches)

    Parameters
    inches

    public boolean justStarted ()

    public void onTouch ( HitTestResult hitTestResult, MotionEvent motionEvent)

    Parameters
    hitTestResult
    motionEvent

    public float pixelsToInches (float pixels)

    Parameters
    pixels

    public void setGestureEventListener ( OnGestureEventListener <T> listener)

    Parameters
    listener

    public boolean wasCancelled ()

    Protected Methods

    protected abstract boolean canStart ( HitTestResult hitTestResult, MotionEvent motionEvent)

    Parameters
    hitTestResult
    motionEvent

    protected void cancel ()

    protected void complete ()

    protected abstract T getSelf ()

    protected abstract void onCancel ()

    protected abstract void onFinish ()

    protected abstract void onStart ( HitTestResult hitTestResult, MotionEvent motionEvent)

    Parameters
    hitTestResult
    motionEvent

    protected abstract boolean updateGesture ( HitTestResult hitTestResult, MotionEvent motionEvent)

    Parameters
    hitTestResult
    motionEvent
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