Implement maxDeltaY for PanGestureHandler on (for iOS only currently)

[brentvatne]

No need to use this exact implementation, it was quick to just get a proof of concept working. It does seem like a valuable prop to add, however. I was able to implement SwipeActions like this:

render() {
  const translateX = this.state._translateX;

  return (
    <View>
      <PanGestureHandler
        id={this.props.gestureId}
        minDeltaX={50}
        maxDeltaY={5}
        onGestureEvent={this._onGestureEvent}
        onHandlerStateChange={this._onHandlerStateChange}>
        <Animated.View
          style={{ transform: [{ translateX: translateX }] }}
          onLayout={this._onLayoutChildren}>
          {this.props.children}
        </Animated.View>
      </PanGestureHandler>

      {this._renderButtons()}
    </View>
  );
}

And on the parent ScrollView I wait for the pan gestures to fail.

[kmagiera]

I think setting "max" bounds shouldn't affect _hasCustomCriteria as when you for example only set "max" but no min, then gesture will never fire. The purpose of _hasCustomCriteria was so that we can use platform default settings of UIPanGestureHandler if no other criteria are set, but the way it works is that if some "min" constrains are set we have a custom logic that is responsible for testing if handler should activate. So if there are no "min" props set and hasCustomCriteria is true the gesture will never activate.

[kmagiera]

This should go in the configure step of gesture handler subclass

[kmagiera]

There are few small things that require fixing but I want to get this in so will fix this on my own. ty