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MVC pattern with QGraphicsItem

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  • D Offline
    D Offline
    Desfell
    wrote on last edited by
    #1

    Hi, I have made a simple MVC with a box that contains text. I have controller, which handles all the requests from outside, the model which stores the data and view which represents the cube itself on QGraphicsScene. My question is how to register a double-click, or mouse release on the view, when it cannot send signals, nor can include the controller, because of circular include?

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    0
    • D Desfell

      @SGaist I would like to do that, but QGraphicsItem cannot emit signals :{

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by
      #6

      @Desfell said in MVC pattern with QGraphicsItem:

      QGraphicsItem cannot emit signals :{

      No but QGraphicsObject Class adds just that if it's what you are missing.

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #2

        Hi and welcome to devnet,

        Why do you have circular dependencies ?

        What type of item are you using ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        D 1 Reply Last reply
        0
        • SGaistS SGaist

          Hi and welcome to devnet,

          Why do you have circular dependencies ?

          What type of item are you using ?

          D Offline
          D Offline
          Desfell
          wrote on last edited by
          #3

          @SGaist No circular dependencies just yet - that was just a horrible idea I had and thankfully did not implement :D So far there is a QGraphicsItem that is the view, with another class, of QWidget, which is supposed to be the controller. I am just curious how to detect on the controller, that the view was double-clicked for example.

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #4

            Emit a signal from the view that you will connect on the controller.

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            D 1 Reply Last reply
            0
            • SGaistS SGaist

              Emit a signal from the view that you will connect on the controller.

              D Offline
              D Offline
              Desfell
              wrote on last edited by
              #5

              @SGaist I would like to do that, but QGraphicsItem cannot emit signals :{

              JonBJ 1 Reply Last reply
              0
              • D Desfell

                @SGaist I would like to do that, but QGraphicsItem cannot emit signals :{

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by
                #6

                @Desfell said in MVC pattern with QGraphicsItem:

                QGraphicsItem cannot emit signals :{

                No but QGraphicsObject Class adds just that if it's what you are missing.

                1 Reply Last reply
                1

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