本文深入探讨了QAbstractScrollArea的实现细节，着重解决在使用QScrollArea无法满足特定需求时的问题。具体包括：1. 无法显示视图窗口，需在scrollArea的paintEvent中调用viewport的paintEvent。2. 如果其他功能仍存在问题，则遵循步骤1操作。本文旨在为开发者提供一种灵活的滚动区域定制方法。
As your guys know, QScrollArea is simple and useful, but it can't always fullfil our requirement, so sometimes we need to customize our ScrollArea, QAbstractScrollArea is a good choice, here I only desribe some issues met about how to implement QAbstractScrollArea.
1. can't show viewport, you need to call the viewport's paint event in scrollArea's paint event.
2. if other functions still can't work, follow step 1.
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