I’m using M3 `ModalNavigationDrawer` with `gesturesEnabled = true`. I noticed that when the `Scaffol...

# compose

[Mark]

I’m using M3 ModalNavigationDrawer with gesturesEnabled = true. I noticed that when the Scaffold content is something like HorziontalPager the open drawer gesture doesn’t work, with the pager seeming taking priority. This is good. However, when the scaffold content contains my custom composable where the user can draw strokes (I use Modifier.pointerInteropFilter for this), then the drawer gestures take priority and so no strokes can be drawn. My current workaround is to explicitly disable drawer gestures when that composable is visible. But is there a better way perhaps involving priority with which pointer events are consumed?

[Albert Chang]

There is a requestDisallowInterceptTouchEvent parameter. You should invoke the lambda if you don’t want pointer input to be stolen by parent, same as in the view world.

[Mark]

Thank Albert. So I see I can pass an instance of RequestDisallowInterceptTouchEvent() to pointerInteropFilter and the documentation says “you can later call it” but when should it be called?

[Albert Chang]

When you detected that a gesture has started and you want to handle the following events of the gesture.

[Mark]

Do you mean at the ACTION_DOWN here? Seems weird though seems to work!

val requestDisallowInterceptTouchEvent = remember { RequestDisallowInterceptTouchEvent() }
modifier = Modifier
    .pointerInteropFilter(
        requestDisallowInterceptTouchEvent = requestDisallowInterceptTouchEvent,
    ) { event ->
        val offset = Offset(event.x, event.y)
        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                requestDisallowInterceptTouchEvent(true)
                onStartStroke(offset)
            }
            MotionEvent.ACTION_MOVE -> onPushPoint(offset)
            MotionEvent.ACTION_UP -> onFinishStroke(offset)
        }
        true
    }

[Albert Chang]

Yeah that's how it works.

[Mark]

Seems I don’t need to requestDisallowInterceptTouchEvent(false) in ACTION_UP

[Albert Chang]

Yes, it will be reset for each gesture.