采样函数返回的用户输入数据

enum UserInputEventType {
  kInvalidEventType = 0,
  kMouseMove = 1,
  kMouseLButtonDown = 2,
  kMouseLButtonUp = 3,
  kMouseLButtonDblClk,
  kMouseMButtonDown,
  kMouseMButtonUp,
  kMouseMButtonDblClk,
  kMouseWheel,
  kMouseRButtonDown,
  kMouseRButtonUp,
  kMouseRButtonDblClk,
  kKeyboardIn
};