QListView 滚动条的两种滚动模式

一种是按Item滚动, 一种是按像素滚动.  两种方式 , 按需所用.

enum QAbstractItemView::ScrollModeConstantValueDescriptionQAbstractItemView::ScrollPerItem0The view will scroll the contents one item at a time.QAbstractItemView::ScrollPerPixel1The view will scroll the contents one pixel at a time.

setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);