是一个基于单文档的应用程序。-is based on a single document applications.

书中主要包含了多文档编辑器、方块游戏、音乐播放器、数据管理系统、局域网聊天工具等5个综合性实例和Qt Quick的内容。-The book consists mainly of multi-document editor, five comprehensive examples of the box games, music player, data management systems, local area network chat tool and Qt Quick content.