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``AbstractViewer`` provides a generalized API to view, save, and print a
document. Properties of both the document and the viewer can be queried:
* Does the document have content?
* Has it been modified?
* Is an overview (thumbnails or bookmarks) supported?
``AbstractViewer`` provides protected methods for derived classes to create
actions and menus on the main window. In order to display these assets on the
main window, they are parented to it. ``AbstractViewer`` is responsible for
removing and destroying the UI assets it creates. It inherits from ``QObject``
to implement signals and slots.
The ``uiInitialized()`` signal is emitted after a viewer receives all necessary
information about UI assets on the main window.
The ``printingEnabledChanged()`` signal is emitted when document printing is
either enabled or disabled. This happens after a new document was successfully
loaded, or, for example, all content was removed.
The ``printStatusChanged`` signal notifies about changes in its progress after
starting the printing process.
The ``documentLoaded()`` signal notifies the application that a document was
successfully loaded.
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