GESTURE_STATE TapDetector::Detect()

in PlayAssetDelivery/NativeSample/common/ndk_helper/gestureDetector.cpp [42:73]

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

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

  int32_t action = AMotionEvent_getAction(motion_event);
  unsigned int flags = action & AMOTION_EVENT_ACTION_MASK;
  switch (flags) {
    case AMOTION_EVENT_ACTION_DOWN:
      down_pointer_id_ = AMotionEvent_getPointerId(motion_event, 0);
      down_x_ = AMotionEvent_getX(motion_event, 0);
      down_y_ = AMotionEvent_getY(motion_event, 0);
      break;
    case AMOTION_EVENT_ACTION_UP: {
      int64_t eventTime = AMotionEvent_getEventTime(motion_event);
      int64_t downTime = AMotionEvent_getDownTime(motion_event);
      if (eventTime - downTime <= TAP_TIMEOUT) {
        if (down_pointer_id_ == AMotionEvent_getPointerId(motion_event, 0)) {
          float x = AMotionEvent_getX(motion_event, 0) - down_x_;
          float y = AMotionEvent_getY(motion_event, 0) - down_y_;
          if (x * x + y * y < TOUCH_SLOP * TOUCH_SLOP * dp_factor_) {
            LOGI("TapDetector: Tap detected");
            return GESTURE_STATE_ACTION;
          }
        }
      }
      break;
    }
  }
  return GESTURE_STATE_NONE;
}