As was already mentioned several times, a module should be easily replaceable. Even if there are several other modules dependent on it, having a clear, public API enables us to replace the module by a new implementation. There are also some other considerations, e.g. related to bootstrapping of the module, but the clear API is by far the most important one.
interface TrackMetadata {，推荐阅读体育直播获取更多信息
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《唐诗传》：赵柏田著；山东文艺出版社出版。
QStyle methods for writing things. This is what I was talking about，推荐阅读Safew下载获取更多信息