Double Tap recognition

Hello,

I want to use a double Tap gesture. I noticed, that the InputClickedEventData provides a TapCount.

But when I try the follwoing, only the Signle Tap is displayed.

Am I missing something? Or do I need to set up some timer to recognize two single Taps in a short time?

    public void OnInputClicked(InputClickedEventData eventData)
    {
      if (eventData.TapCount > 1)
        Debug.Log("Double Tap");
      else
        Debug.Log("Single Tap");
    }

Thanks in advance.

[killerantz]

Honestly, if we have to check the tap count and wait for seconds to tell the difference between a single and double tap, then the double tap functionality is not really in place. If it were, there would be a DoubleTap Event and the system would handle all this. So it may be best to roll your own for now, it’s the same amount of code and less hassle.

private Coroutine _tapRoutine;
void Start()
{
    _gestureRecognizer = new GestureRecognizer();
    _gestureRecognizer.TappedEvent += GestureRecognizerOnTappedEvent;
    _gestureRecognizer.SetRecognizableGestures(GestureSettings.Tap);
    _gestureRecognizer.StartCapturingGestures();
    _gestureRecognizer.TappedEvent += (source, tapCount, ray) =>
    {
            if (_tapRoutine == null)
            {
                _tapRoutine = StartCoroutine(TapTimer());
            }
            else
            {
                StopCoroutine(_tapRoutine);
                _tapRoutine = null;
                print("doubleTap!");
                Shoot();
            }
    };
}

private IEnumerator TapTimer()
{
      yield return new WaitForSeconds(0.3f);
      print("singleTap!");
      _tapRoutine = null;
      Shoot1();
}

[killerantz]

I have not been able to get double-tap to work with the IPointerClickHandler, I only get zeros as the clickCount. You’ll need to have EventSystem added to the scene for IPointerClickEvents to occur. Just add a UI button to the scene and the EventSystem comes in as well.

I was able to get double-taps to work using IInputClickHandler and OnInputClicked(InputClickedEventData eventData) though.

First thing is the GesturesInput is not setup to handle double-tap detection, so you need to add it to the recognizable gestures by opening HoloToolkit/UI/Scripts/InputSources/GesturesInput.cs

On line 46 add GestureSettings.DoubleTap to the gestureRecognizer like this.

gestureRecognizer.SetRecognizableGestures(GestureSettings.Tap | GestureSettings.ManipulationTranslate | GestureSettings.Hold | GestureSettings.DoubleTap);

Then in the OnInputClicked handler look at the tapCount which should be 1 or 2. public virtual void OnInputClicked(InputClickedEventData eventData) { print(eventData.TapCount); }

Two events will fire on a double-tap (1 and 2), so if you want to capture both single-taps and double-taps on the same object, you will have to delay the single-tap execution to see if a double-tap does not immediately follow. I hope that makes sense.

Maybe there’s a part of the EventSystem that needs to register to listen for double taps to get the IPointer stuff working, but I haven’t dug that far into it yet.