我通过 addDockWidget 将各种停靠小部件添加到我的窗口，并通过 setCentralWidget 添加一个主要小部件。使用 addDockWidget 添加的小部件会自动添加（上下文菜单由 Qt 生成）到右键单击时出现的上下文菜单列表，允许用户切换可见性各种停靠小部件的：
但是，通过 setCentralWidget 添加的小部件在此菜单中不存在，并且如果它“关闭”，则无法通过上下文菜单再次使其可见。如何将中央小部件添加到此菜单？
I add various dock widgets to my window through addDockWidget, and one main widget through setCentralWidget. The widgets added with addDockWidget are automatically added (the context menu is generated by Qt) to a context menu list that appear when right-clicking, allowing the user to toggle the visibility of the various dock widgets:
However, the widget added through setCentralWidget is absent from this menu, and if it's "closed" it can't be made visible again through the context menu. How can I add the central widget to this menu?
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