how to abort a function taking to long to process

[Ginsengelf]

QCoreApplication::processEvents is static. Just add a call to your for loop:

for (i=0;i<Lots_of_calculation && !bAbort ;i++) // set bAbort in keyPressEvent or wherever you like
{
    ....
     lots of calculation;
     QCoreApplication::processEvents (); // <-- new
     blablabla...;
     more calculation;
     .....
}

for (i=0;i<Lots_of_calculation && !bAbort ;i++) // set bAbort in keyPressEvent or wherever you like
{
    ....
     lots of calculation;
     QCoreApplication::processEvents (); // <-- new
     blablabla...;
     more calculation;
     .....
}

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Ginsengelf