在QDesigner中拖入一个QScrollArea,为QScrollArea添加widget的方法。-Drag in QDesigner in a QScrollArea, as QScrollArea add widget method.

QScrollArea的基本应用，当图片大小超过窗口大小，自动产生滚动条-The basic application of QScrollArea, when the image size exceeds the window size, scroll bars automatically generated

The QScrollArea class provides a scrolling view onto another widget for Linux.