react-native-gesture-handler/lib/module/handlers/gestures/GestureDetector/needsToReattach.js

Declarative API exposing native platform touch and gesture system to React Native

// Checks whether the gesture should be reattached to the view, this will happen when:
// - The number of gestures in the preparedGesture is different than the number of gestures in the gesture
// - The handlerName is different in any of the gestures
// - At least one of the gestures changed the thread it runs on
export function needsToReattach(preparedGesture, newGestures) {
  if (newGestures.length !== preparedGesture.attachedGestures.length) {
    return true;
  }

  for (let i = 0; i < newGestures.length; i++) {
    if (newGestures[i].handlerName !== preparedGesture.attachedGestures[i].handlerName || newGestures[i].shouldUseReanimated !== preparedGesture.attachedGestures[i].shouldUseReanimated) {
      return true;
    }
  }

  return false;
}
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