Hi Steven,
yes, that's right.
HandleEvent() mainly is called by the class mitkGlobalInteraction. This
method should not be changed, because it handles the changes of the
statemachine (changes to a next state, calling actions etc.).
Within this method ExecuteAction() is as many times as there are actions
to be processed.
There are special states called guard states that check special
conditions (e.g. will the set of points be full after addition of a
point?). The condition is checked within the method ExecuteAction() and
then HandleEvent() is called again but now with different parameters
containing the result of the check. Thus ExecuteAction() is reentrant,
yes! But every time a different switch case block is used.
See http://docs.mitk.org/nightly-qt4/InteractionPage.html
for a more detailed documentation.
Best Regards,
Ingmar
Von: Steven Wu [mailto:[email protected]]
Gesendet: Sonntag, 12. Juli 2009 22:42
An: [email protected]
Betreff: [mitk-users] question on reentrant of HandleEvent and
ExecutAction?
Hi All,
I have a question regarding HandleEvent and ExecutAction in a
StateMachine. Are these function reentrant? I just read
mitkPointSetInteractor and found It's ExecuteAction has several actions
to call this->HandleEvent again, which means
mitkPointSetInteracor::ExecuteAction will be called again. Can someone
clear me for that? Thanks!
Regards,
Steven
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