relation between QEventloop and QAbstractEventDispatcher

What is the relation between QEventloop an开发者_JAVA百科d QAbstractEventDispatcher ?

Event loop is a loop that runs the event dispatcher until the loop is broken.

But in Documentation of QEventLoop there is no single method that takes an QAbstractEventDispatcher as argument.

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Why should there be a method in QEventLoop that takes a Subclass of QAbstractEventDispatcher?

In every application, or more precise in every thread there is only one QAbstractEventDispatcher subclass instance which is only processing incomint system/Qt events and dispatches them to the Q(Core)Application. The QAbstractEventDispatcher is only a helper, it isn't listening to events, it has to be triggered, for example by a QEventLoop. The Eventloop is basically a infinite loop which uses the thread global event dispatcher to dispatch events if need be. I hope that clears it up a little.