GESTURE_STATE DoubletapDetector::Detect()

in PlayAssetDelivery/NativeSample/common/ndk_helper/gestureDetector.cpp [85:117]

• 30 lines of code
• 7 McCabe index (conditional complexity)

GESTURE_STATE DoubletapDetector::Detect(const AInputEvent* motion_event) {
  if (AMotionEvent_getPointerCount(motion_event) > 1) {
    // Only support single double tap
    return false;
  }

  bool tap_detected = tap_detector_.Detect(motion_event);

  int32_t action = AMotionEvent_getAction(motion_event);
  unsigned int flags = action & AMOTION_EVENT_ACTION_MASK;
  switch (flags) {
    case AMOTION_EVENT_ACTION_DOWN: {
      int64_t eventTime = AMotionEvent_getEventTime(motion_event);
      if (eventTime - last_tap_time_ <= DOUBLE_TAP_TIMEOUT) {
        float x = AMotionEvent_getX(motion_event, 0) - last_tap_x_;
        float y = AMotionEvent_getY(motion_event, 0) - last_tap_y_;
        if (x * x + y * y < DOUBLE_TAP_SLOP * DOUBLE_TAP_SLOP * dp_factor_) {
          LOGI("DoubletapDetector: Doubletap detected");
          return GESTURE_STATE_ACTION;
        }
      }
      break;
    }
    case AMOTION_EVENT_ACTION_UP:
      if (tap_detected) {
        last_tap_time_ = AMotionEvent_getEventTime(motion_event);
        last_tap_x_ = AMotionEvent_getX(motion_event, 0);
        last_tap_y_ = AMotionEvent_getY(motion_event, 0);
      }
      break;
  }
  return GESTURE_STATE_NONE;
}