QSlider之指哪打哪

可以使用事件过滤，代码如下
switch(event->type())
{      
case QEvent::MouseButtonPress:
            {
                if(((QMouseEvent *)event)->button() == Qt::LeftButton)
                {
                    int max = ((QSlider*)obj)->maximum();
                    int min = ((QSlider*)obj)->minimum();
                    int pointPos = ((double)((QMouseEvent *)event)->x()) / ((QSlider*)obj)->width()*(max - min)+min;
                    if(abs(pointPos - ((QSlider*)obj)->value())> (((QSlider*)obj)->pageStep()) )
                    {
                        ((QSlider*)obj)->setValue(pointPos);
                        return true;
                    }
                    else
                    {
                        return false;
                    }
                }
                else
                    return false;
           }
}
这样,在滑块与鼠标距离很近时(小于pageStep)，return false使用QSlider默认的点击处理，距离比较大时(大于pageStep)，自己手动处理，避免了很近时点击乱动的现象