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Thanks for this! Love the writing style.

• The idea is right to prevent overscroll on the top when dismissing, however it doesn't disable the gesture when you're not at the top of the ScrollView. If you scroll down, release the gesture, then scroll up again it shouldn't dismiss the modal. We'd need to use gesturesEnabled and set it to false when the ScrollView isn't at the top (scroll offset <= 0, negative offset is overscroll bounce).
• We need to add some y offset failure criteria to the PanGestureHandler in https://github.com/react-navigation/react-navigation-stack/blob/master/src/views/StackView/StackViewLayout.js - right now there's a delay when you try to scroll.
• It may be easier to disable the gestures entirely and re-implement the gesture entirely for the modal, because I think we won't be able to implement it properly otherwise without adding y offset failure criteria. A good starting point would be this: https://github.com/react-navigation/react-navigation-stack/blob/master/example/src/TransparentStack.js

Oh man, I initially didn't notice the delay, but now that you point it out it's awful! You're right, we can do better. I'll take a look at that TransparentStack!

Thanks for the feedback :)

Hmm any pointers how to build this interaction? This proposed solution doesn't really work every time. This would be nice to document, as a scrollable + modal is a pretty common use case, and it seems to be possible now that RN3.0 uses react-native-gesture-handler. I don't really know where to start however.

@jfrolich Ditto. @ryan-gilb did you manage to ever fix the issue where pressing down sometimes works (starting the modal close gestures), sometimes doesn't (still pulling from the scrollview)?