Hi, On Monday 23 June 2014 09:30:23 Turunen Tuukka wrote: > The CLA is now in place and you are able to proceed with the contributions.
great news! > Based on the discussions at QtCS and the mailing lists, what was seen as the > best approach for the repositories? A new playground project for both QQSM > and Replicant? Based on the suggestions we got at QtCS we would like to try to get QQSM directly into qtdeclarative. It's a fairly small plugin as it's basically just QML API for the existing QStateMachine classes, and we are further reducing it by improving the Q_PROPERTY interface of QStateMachine in QtCore directly (three patches for that are on Gerrit already, awaiting review). regards, Volker > From: Tuukka Turunen > <[email protected]<mailto:[email protected]>> Date: Monday 2 > June 2014 09:55 > To: "Stottlemyer, Brett (B.S.)" > <[email protected]<mailto:[email protected]>>, > "[email protected]<mailto:[email protected]>" > <[email protected]<mailto:[email protected]>> Subject: > Re: [Development] Request for sandbox area: QQSM > > > Hi Brett, > > Thank you for the initiative. I also think there is indeed a lot of > unleashed potential in the Qt State Machine Framework for such applications > that benefit from having a solid state machine based development approach. > Qt State Machine Framework is not yet hooked into the Qt Quick world, so > also from that viewpoint your proposal looks good. Whether it is the right > approach to hook into Qt Quick will be found out when the detailed > discussions and reviews are done. > > Making a playground project for QQSM would be a good first step. However, > the CLA needs to be signed prior to you being able to contribute the code. > You can find the Corporate CLA, accepted by other companies contributing to > Qt, at: > https://qt-project.org/legal/Corporate_QtContributionLicenseAgreement.pdf. > If you can get it signed before the Qt Contributor Summit, it would make > it easier to discuss the details about QQSM. > > Looking forward in seeing you in Berlin. > > Yours, > > -- > > Tuukka Turunen > Director, R&D > Digia, Qt > > Address: Piippukatu 11, 40100 Jyväskylä, FINLAND > Email: [email protected]<mailto:[email protected]> > Mobile: + 358 40 7655 800 > > Qt Website: http://qt.digia.com<http://qt.digia.com/> > Qt Blog: http://blog.qt.digia.com<http://blog.qt.digia.com/> > Qt Project: http://www.qt-project.org<http://www.qt-project.org/> > > ------------------------------------------------------------------ > PRIVACY AND CONFIDENTIALITY NOTICE > This message and any attachments are intended only for use by the named > addressee and may contain privileged and/or confidential information. If > you are not the named addressee you should not disseminate, copy or take > any action in reliance on it. If you have received this message in error, > please contact the sender immediately and delete the message and any > attachments accompanying it. Digia Plc does not accept liability for any > corruption, interception, amendment, tampering or viruses occurring to this > message. ------------------------------------------------------------------ > > From: <Stottlemyer>, "Brett (B.S.)" > <[email protected]<mailto:[email protected]>> Date: Saturday 31 May 2014 > 01:14 > To: "[email protected]<mailto:[email protected]>" > <[email protected]<mailto:[email protected]>> Subject: > [Development] Request for sandbox area: QQSM > > Hi list, > > My name is Brett Stottlemyer. I work for Ford Motor Company, and Ford has > graciously agreed to let us contribute some of the cool stuff we’ve > developed back to Qt. We aren’t quite done with everything yet (still > waiting on the Corporate CLA), but I will be at Qt Contributors Summit in a > week and a half to discuss this and a 2nd project, and answer (hopefully a > bunch) of good questions. > > I’d like to officially request a sandbox for: QQSM > > What is it? > QQSM is the Qt QML State Machine. Simply put, it is a QML module to allow > you to create Qt State Machine Framework instances via the QML engine. > > What need does this module solve? > QQSM makes it a lot easier to create state machines. You get all of the > benefits of the maturity of Qt's State Machine Framework, the ability to > introspect/debug the machine with tools like gammaray, but with a > simplified syntax and QML's runtime bindings. An example of the > simplification? A guard condition for a transition can use QML/javascript > and use signal parameters in deciding whether to trigger a transition – > entirely in QML markup. > > Detailed description > QQSM is basically a Domain Specific Language (in QML) for simplified > descriptions of State Machines. While the C++ State Machine Framework is > complete, it requires a lot of boilerplate code. The examples I've seen > have created numerous QSignalTransition derived classes, one for each > boolean condition required to test for a transition. > > While QML already has a State type, this is not a complete, deterministic > state machine. This is an overly simplified state machine, in that it > provides little in terms of error checking or nested states. > > The proposed QQSM module, on the other hand, provides BasicState (to not > conflict with existing State type), HistoryState and FinalState, plus > StateMachine, SignalTransition and TimeoutTransition types. The benefit of > QML for State Machines is much more than just having to write less code, > though. Two features of the QML engine are runtime processing of scripted > code, and dynamic Signal/Slot connections. Since all SignalTransition > classes provide a boolean result for eventTest(), a single C++ > implementation was created that uses a boolean property ("guard") for the > eventTest result. This allows any QML/Javascript expression that resolves > to a boolean to be used. The dynamic connections make is easy to bind > onEntry and onExit signals to non-state machine QObjects. > > The end result is an environment that allows State Machines to be developed > rapidly and succinctly. > > Hope you like the idea, and approve the sandbox area. > > Looking forward to your thoughts! > > Sincerely, > Brett Stottlemyer > Ford Motor Company -- Volker Krause | [email protected] | Senior Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel. Germany +49-30-521325470, Sweden (HQ) +46-563-540090 KDAB - Qt Experts - Platform-independent software solutions
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