Popup dialog with standard buttons and a title, used for short-term interaction with the user.

The ability to inject C++ data into a QML object is made possible by the QQmlContext class. This class exposes data to the context of a QML object so that the data can be referred to directly from within the scope of the QML code

• QQmlContext
• context of a QML object

GroupBox is used to layout a logical group of controls together, within a titled visual frame.
关键点：

• layout
• group of controls
• titled visual frame

效果图：

Use Qt Quick Layouts to arrange items in a user interface. Qt Quick Layouts resize their items, which makes them well suited for resizeable user interfaces.