* @brief Returns maximum of the allowed value range. * \sa setMaximum, setRange */

* @brief Returns minimum of the allowed value range. * \sa setMinimum, setRange */

* @brief Return position (in degrees) of minimum value. * \sa setNullPosition */

* @brief Returns width of the outline circle pen. */

\brief 绘制左上角按钮 \param painter 设置好绘制设备的painter \param btn 左上角按钮,左上角按钮指针，Painter已经把此按钮设置为此绘制设备

\brief 移除并隐藏所有的dock

\brief 显示指定序号的dock \param index 指定序号，如果不指定，则会显示所有

\brief 数字转换为26字母 1->A 26->Z \param data \return

* @brief Returns current value shown on the widget. * \sa setValue() */