QT custom QSlider with cursor

Recently, I have a look at 6 I wrote an article about years ago QSlider The blog of ：Qt Custom with cursor slider, Displays the current value directly above the slider
Found that there are many problems , For example, the coordinates of the cursor are not accurate ; If the cursor width is slightly larger , Slide to Slider The leftmost or rightmost display is incomplete ; The cursor is not beautiful enough .
PS： Here is a beautiful Slider Style sheets https://blog.csdn.net/caoshangpa/article/details/53389517

One . effect

So I realized it again today , It is still subclassing QSlider, The effect is as follows , Supports setting the size of the cursor ：

  Two . Realization

This time the implementation is much simpler than before , Just... Again paintEvent and mouseMoveEvent Can completely achieve the desired effect , because QSlider Bring their own isSliderDown Method to determine whether the mouse is in the slider （handle） Press up
Because on the slider hover Need to display cursor , So you need to add... To the constructor setMouseTracking(true); The key here is how to get the slider rect,