QSlider

The slider is the classic widget for controlling a bounded value.
 It lets the user move a slider handle along a horizontal or vertical groove and translates the handle's position into an integer value within the legal range.
滑块是用于控制有界值的经典小部件。
它允许用户沿着水平或垂直凹槽移动滑块手柄，并将手柄的位置转换为合法范围内的整数值。

QSS 代码