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Calling static function from QML? Doable?

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  • M Offline
    M Offline
    mlong
    wrote on last edited by
    #6

    Perhaps you could write a small utility wrapper class which you can instantiate, which then has methods which pass things back and from from the singleton.

    Software Engineer
    My views and opinions do not necessarily reflect those of anyone -- living or dead, real or fictional -- in this universe or any other similar multiverse node. Void where prohibited. Your mileage may vary. Caveat emptor.

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    • S Offline
      S Offline
      SnowmanX
      wrote on last edited by
      #7

      Yeah, doable, but not exactly feasible ... Furthermore I seem to have more problems with enums at this point - the enum declared in the class declaring the static function (the singleton) is not visible to QML when used from the other helper class ... another bummer :(

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      • T Offline
        T Offline
        task_struct
        wrote on last edited by
        #8

        You can write a wrapper class that can be instantiated multiple times in QML and communicates with the singleton. It's not pretty, but I don't know what else can be done.

        Edit:
        Sorry. I was too slow and there wasn't warning that there are new posts :(

        "Most good programmers do programming not because they expect to get paid or get adulation by the public, but because it is fun to program."

        • Linu...
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        • S Offline
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          SnowmanX
          wrote on last edited by
          #9

          Thanks guys, I guess I'll try to enter in issue that static functions should be directly callable from QML, as not having this feature is making certain patterns difficult if not impossible (the mentioned problem with enum coming from a different class ...).

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          • M Offline
            M Offline
            mlong
            wrote on last edited by
            #10

            Sounds like a good idea.

            As an aside, as a workaround, you could -- and yes, I know it's dirty and nasty -- always mirror the enum in the class that's visible to QML.

            Software Engineer
            My views and opinions do not necessarily reflect those of anyone -- living or dead, real or fictional -- in this universe or any other similar multiverse node. Void where prohibited. Your mileage may vary. Caveat emptor.

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            • S Offline
              S Offline
              SnowmanX
              wrote on last edited by
              #11

              Thanks for the tip. It might do it for at least some of the usecases.

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              • M Offline
                M Offline
                mlong
                wrote on last edited by
                #12

                If you do add a jira request for the issue, please be sure and add a link to it here for future reference.

                Software Engineer
                My views and opinions do not necessarily reflect those of anyone -- living or dead, real or fictional -- in this universe or any other similar multiverse node. Void where prohibited. Your mileage may vary. Caveat emptor.

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                • M Offline
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                  mbrasser
                  wrote on last edited by
                  #13

                  Hi,

                  For QtQuick 2.0 we are introducing an additional "module API", which should allow you to implement the singleton pattern more easily.

                  The docs for this don't seem to be correctly generated at the moment, but you can view them in source at https://qt.gitorious.org/qt/qtdeclarative/blobs/master/src/declarative/qml/qdeclarative.h (look for qmlRegisterModuleApi)

                  Regards,
                  Michael

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                  • L Offline
                    L Offline
                    lgeyer
                    wrote on last edited by
                    #14

                    [quote author="mbrasser" date="1317857789"]Hi, For QtQuick 2.0 we are introducing an additional "module API", which should allow you to implement the singleton pattern more easily.[/quote]

                    Do you coincidentally know if there is a (provisional) changelog for QtQuick 2.0, a compiled list of (planned) changes or something like that?

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                    • sierdzioS Offline
                      sierdzioS Offline
                      sierdzio
                      Moderators
                      wrote on last edited by
                      #15

                      [quote author="Lukas Geyer" date="1317904148"][quote author="mbrasser" date="1317857789"]Hi, For QtQuick 2.0 we are introducing an additional "module API", which should allow you to implement the singleton pattern more easily.[/quote]

                      Do you coincidentally know if there is a (provisional) changelog for QtQuick 2.0, a compiled list of (planned) changes or something like that?[/quote]

                      Not a real changelog, but at least a glimpse on what's to come: http://doc.qt.nokia.com/qt5-snapshot/qtquick2-whatsnew.html

                      (Z(:^

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                      • L Offline
                        L Offline
                        lgeyer
                        wrote on last edited by
                        #16

                        Thanks.

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                        • S Offline
                          S Offline
                          spiritqt
                          wrote on last edited by
                          #17

                          Hi,
                          you can use approach described "here":http://doc.qt.nokia.com/4.7-snapshot/qtbinding.html#embedding-c-objects-into-qml-components. It works fine for me.

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                          • S Offline
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                            steno
                            wrote on last edited by
                            #18

                            [quote author="mbrasser" date="1317857789"]Hi,

                            For QtQuick 2.0 we are introducing an additional "module API", which should allow you to implement the singleton pattern more easily.

                            [/quote]

                            So, is the new module api the function qmlRegisterSingletonType?

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