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QListWidget with dynamic icons

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  • H Offline
    H Offline
    Harry123
    wrote on last edited by Harry123
    #3

    I would really prefer to avoid creating icons that will never be looked at, if possible.
    I might find myself creating 1000 icons, while the user will never look at more than the first few screens.

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

      Sorry, I just saw that my suggestion is incomplete. Your model should be queried when needed for the icons so what I was suggesting is that when one is queried, you start loading it and then trigger the dataChanged signal.

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

      H 1 Reply Last reply
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      • SGaistS SGaist

        Sorry, I just saw that my suggestion is incomplete. Your model should be queried when needed for the icons so what I was suggesting is that when one is queried, you start loading it and then trigger the dataChanged signal.

        H Offline
        H Offline
        Harry123
        wrote on last edited by
        #5

        @SGaist

        Could you please add more details about this procedure.
        I never used model/view.

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #6

          Which part would like to have more detail on ?

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

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          • SGaistS SGaist

            Which part would like to have more detail on ?

            H Offline
            H Offline
            Harry123
            wrote on last edited by Harry123
            #7

            @SGaist

            I would prefer to use QListWidget, because it is much simpler than using model/view with which I have no experience.
            I need some pointers as to what should be done - classes and functions to call.

            I myself was thinking more in the direction of connecting to the vertical scrollbar of QListWidget and anticipating scrolls, but I'm not sure I would guess correctly from the scroll events exactly which items will be displayed.

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #8

              If you use QListWidget then you don't have any control over the model so you won't be able to move the image loading part outside of it.

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

              H 1 Reply Last reply
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              • SGaistS SGaist

                If you use QListWidget then you don't have any control over the model so you won't be able to move the image loading part outside of it.

                H Offline
                H Offline
                Harry123
                wrote on last edited by
                #9

                @SGaist

                I have basically given up on using QListWidget that efficiently.

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  What option did you choose ?

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

                  H 1 Reply Last reply
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                  • SGaistS SGaist

                    What option did you choose ?

                    H Offline
                    H Offline
                    Harry123
                    wrote on last edited by
                    #11

                    @SGaist

                    I have divided the list into sections, and modified the UI to show only one section at a time.
                    This solved the performance problem (and maybe even made the UI more user-friendly).

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #12

                      It's good when it's more friendly :)

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

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