NativeViewGestureHandler.js

import DiscreteGestureHandler from './DiscreteGestureHandler';
import * as NodeManager from './NodeManager';
import PressGestureHandler from './PressGestureHandler';
import { TEST_MIN_IF_NOT_NAN, VEC_LEN_SQ } from './utils';

class NativeViewGestureHandler extends PressGestureHandler {
  onRawEvent(ev) {
    super.onRawEvent(ev);
    if (!ev.isFinal) {
      // if (this.ref instanceof ScrollView) {
      if (TEST_MIN_IF_NOT_NAN(VEC_LEN_SQ({ x: ev.deltaX, y: ev.deltaY }), 10)) {
        if (this.config.disallowInterruption) {
          const gestures = Object.values(NodeManager.getNodes()).filter(gesture => {
            const { handlerTag, view, isGestureRunning } = gesture;
            return (
              // Check if this gesture isn't self
              handlerTag !== this.handlerTag &&
              // Ensure the gesture needs to be cancelled
              isGestureRunning &&
              // ScrollView can cancel discrete gestures like taps and presses
              gesture instanceof DiscreteGestureHandler &&
              // Ensure a view exists and is a child of the current view
              view &&
              this.view.contains(view)
            );
          });
          // Cancel all of the gestures that passed the filter
          for (const gesture of gestures) {
            // TODO: Bacon: Send some cached event.
            gesture.forceInvalidate(ev);
          }
        }
      }
    }
  }
}

export default NativeViewGestureHandler;