ScaleGestureRecognizer: make pointerCount public #127310

kseino · 2023-05-22T10:46:21Z

make pointCount in ScaleGestureRecognizer public to handle pointer event depending on the number of pointers.

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Renzo-Olivares · 2023-05-30T17:13:06Z

Hi @kseino, thank you for the contribution! I have read through your proposal but I don't completely understand the use-case for this. Is there some functionality that pointerCount provided by ScaleStartDetails/ScaleUpdateDetails/ScaleEndDetails does not allow you to accomplish?

Would something like this work?

void onScaleStart(ScaleStartDetails details) {
    if (details.pointerCount == 2) {
        // Some logic.
    }
}

goderbauer · 2023-06-27T22:18:56Z

(Triage) @kseino Do you still have plans to follow up on the feedback given above?

kseino · 2023-07-10T13:58:39Z

@Renzo-Olivares @goderbauer
sorry for the late reply, I was on vacation.

we need to call resolve or reject by pointCount in handleEvent instead of ScaleStartDetails/ScaleUpdateDetails/ScaleEndDetails

class CustomScaleGestureRecognizer extends ScaleGestureRecognizer {
  @override
  void handleEvent(PointerEvent event) {
    super.handleEvent(event);
    if (pointerCount == 2) {
      // resolve or reject
    }
  }
}

if this is not a common use case, I think this PR will be closed..

Renzo-Olivares · 2023-07-20T19:48:12Z

@kseino, so the use-case is that you would like a way to resolve/reject a scale gesture based on the number of pointers? For example reject a 4-pointer scale. If so, this sounds like a reasonable change to me, and we already expose pointerCount publicly through the details objects.

kseino · 2023-07-21T00:42:47Z

@Renzo-Olivares

@kseino, so the use-case is that you would like a way to resolve/reject a scale gesture based on the number of pointers?

yes, that is exactly what we want!

Piinks · 2023-08-15T21:51:57Z

Since this is already supported, should we close this PR? In the test cases, the pointer count is already available through the Scale*Details objects as @Renzo-Olivares pointed out.

kseino · 2023-08-16T14:26:46Z

@Piinks
we want know the pointer count in handleEvent method, but this is not supported..

Piinks · 2023-08-16T17:33:15Z

we want know the pointer count in handleEvent method, but this is not supported..

Oh I think I see... This case only provides the PointerEvent

Piinks

Piinks · 2023-09-11T21:29:11Z

@Renzo-Olivares would you be able to give second approval for this?

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HansMuller requested a review from Renzo-Olivares May 26, 2023 21:36

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ScaleGestureRecognizer: make pointerCount public

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kseino commented May 22, 2023

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