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How to get layout type from base class?

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  • SPlattenS Offline
    SPlattenS Offline
    SPlatten
    wrote on last edited by
    #1

    I am supporting all the layouts by storing an instance of the base class, is there a way to determine the type of layout from the base class?

    This is so I know if I can cast the base back to for example QFormLayout to allow use of the form related functions.

    Kind Regards,
    Sy

    jsulmJ 2 Replies Last reply
    0
    • SPlattenS SPlatten

      I am supporting all the layouts by storing an instance of the base class, is there a way to determine the type of layout from the base class?

      This is so I know if I can cast the base back to for example QFormLayout to allow use of the form related functions.

      jsulmJ Online
      jsulmJ Online
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #2

      @SPlatten https://doc.qt.io/qt-5/qobject.html#metaObject
      https://doc.qt.io/qt-5/qmetaobject.html#className

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      SPlattenS 1 Reply Last reply
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      • jsulmJ jsulm

        @SPlatten https://doc.qt.io/qt-5/qobject.html#metaObject
        https://doc.qt.io/qt-5/qmetaobject.html#className

        SPlattenS Offline
        SPlattenS Offline
        SPlatten
        wrote on last edited by
        #3

        @jsulm thank you

        Kind Regards,
        Sy

        1 Reply Last reply
        0
        • SPlattenS SPlatten

          I am supporting all the layouts by storing an instance of the base class, is there a way to determine the type of layout from the base class?

          This is so I know if I can cast the base back to for example QFormLayout to allow use of the form related functions.

          jsulmJ Online
          jsulmJ Online
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #4

          @SPlatten said in How to get layout type from base class?:

          This is so I know if I can cast the base back to for example QFormLayout

          You can always try to cast, if the type is wrong you'll get nullptr.
          https://doc.qt.io/qt-5/qobject.html#qobject_cast

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          SPlattenS 1 Reply Last reply
          1
          • jsulmJ jsulm

            @SPlatten said in How to get layout type from base class?:

            This is so I know if I can cast the base back to for example QFormLayout

            You can always try to cast, if the type is wrong you'll get nullptr.
            https://doc.qt.io/qt-5/qobject.html#qobject_cast

            SPlattenS Offline
            SPlattenS Offline
            SPlatten
            wrote on last edited by
            #5

            @jsulm , I like that idea:

                        QFormLayout* pobjForm(qobject_cast<QFormLayout*>(pobjLayout));
                        QGridLayout* pobjGrid(qobject_cast<QGridLayout*>(pobjLayout));
                        QHBoxLayout* pobjHBox(qobject_cast<QHBoxLayout*>(pobjLayout));
                        QVBoxLayout* pobjVBox(qobject_cast<QVBoxLayout*>(pobjLayout));
            

            Simple and elegant.

            Kind Regards,
            Sy

            1 Reply Last reply
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