Support for the page slider function in presentation mode.
对presentation模式中页面侧边栏功能的支持。
Note that when the currently active audio output device does not support volume control (such as an A2DP device), the volume slider is replaced by the appropriate device name.
注意如果当前的声音输出设备不支持音量控制(就像设备A2DP)，音量滑块就不会显示，取而代之的是设备名称。
The location slider of the support arm is cooperated to the sliding-groove of the sliding column to form to sliding mechanism.
在支撑臂定位座的上壁顶口处对应支撑臂的滑动槽设置凸形滑动块；
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