how to override QState and use it

[mrjj]

@AndreAhmed
From your own constructor, you also call base class constructor
as part of constructing your QState child.

[AndreAhmed]

what should I pass a dummy QState or a QStatemachine ?

[mrjj]

@AndreAhmed
I think u can pass a Dummy but not sure u need to do it?

[mrjj]

hi
this sample also inherited QState
http://doc.qt.io/qt-5/qtwidgets-statemachine-pingpong-example.html

[AndreAhmed]

do you know how should I keep the state active until a condition occurs ? How to implement that ?

[mrjj]

@AndreAhmed
well a given state is active when no Transition has happened.

do you mean like a function being called over and over while in a state?

[AndreAhmed]

yes I mean a function that's called over and over , then after a condition like if(cnt==5) go to next state.

[AndreAhmed]

a giving state is active but it only calls onEnter() just once.

[mrjj]

@AndreAhmed
Hi
Look here
https://doc.qt.io/archives/4.6/statemachine-trafficlight.html

They use a timer.
You could do the same and simply enable onEnter
and turn off onExit.

[AndreAhmed]

hi,

thanks for the answer. How would I put a timer for onEntry() I'm so confused

[mrjj]

@AndreAhmed
Add a QTimer timer; to your state
add a slot to your state
connect timer to slot

OnEnter
timer.start(1000); // call ur slot every 1 sec

OnExit
timer.stop();

[AndreAhmed]

Can I say addtransition inside the slot of the timer so that to move to another state ?

how to manage states then, they should be in one cpp file ?

[mrjj]

@AndreAhmed
You can use any normal QState function in the slot to advance state.

Well, I guess keeping related states in same cpp sounds like good plan.

You did see
http://doc.qt.io/qt-5/statemachine-api.html
?

[AndreAhmed]

Yes I did but didn't know how to use the classes of the QState,..etc.

So the steps now

1. Inherit from QState and implement onEnter on Exit
2. make a timer
3. start the timer in onEnter()
4. do the logic inside the slot of the timer
5. add the transition there

[mrjj]

hi
Yes something like that. Please make Timer a class member.

Just a note:
Well it has signals also
void entered()
void exited()
http://doc.qt.io/qt-5/qabstractstate.html#entered
So you dont need to subclass to use Enter/exit.