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    <p>The <a href="http://qt-project.org/doc/qt-4.8/eventsandfilters.html" rel="nofollow noreferrer">Qt documentation</a> probably explains it best:</p> <blockquote> <p>In Qt, events are objects, derived from the abstract QEvent class, that represent things that have happened either within an application or as a result of outside activity that the application needs to know about. Events can be received and handled by any instance of a QObject subclass, but they are especially relevant to widgets. This document describes how events are delivered and handled in a typical application.</p> </blockquote> <p>So events and signal/slots are two parallel mechanisms accomplishing the same things. In general, an event will be generated by an outside entity (for example, keyboard or mouse wheel) and will be delivered through the event loop in QApplication. In general, unless you set up the code, you will not be generating events. You might filter them through <code>QObject::installEventFilter()</code> or handle events in subclassed object by overriding the appropriate functions.</p> <p>Signals and Slots are much easier to generate and receive and you can connect any two QObject subclasses. They are handled through the Metaclass (have a look at your moc_classname.cpp file for more), but most of the interclass communication that you will produce will probably use signals and slots. Signals can get delivered immediately or deferred via a queue (if you are using threads).</p> <p>A signal can be generated.</p>
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    1. USPeter Mortensen
    1. USHarald Scheirich
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    1. COthe deferred queue is the same as the queue event loop, or it exists two queues? one for deffered signals and on for event ?
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      1. USGuillaume07
    2. CO@Raphael shame on you for accepting this answer. – The cited paragraph does not even contain the words “signal” or “slot”!
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      1. USRobert Siemer
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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