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Model View

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  • E Offline
    E Offline
    EugeneT
    wrote on last edited by
    #1

    Hi, I need to write an app which shows a lot of items at the same time some items update and undefined quantity new items come over the network. The list of items persistently grows.
    I wrote a Model inherited of QAbstractItemModel, and the some time it works well, but after a while the app starts to slow down.
    Do you know a decision how to fix it? Thanks.

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    • Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #2

      @EugeneT said in Model View:

      Do you know a decision how to fix it?

      I would say - fix your model or don't add more than maybe 100k items to it.

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      • gde23G Offline
        gde23G Offline
        gde23
        wrote on last edited by
        #3

        You can try to implement fetchMore() for your model, so only the data that you want to see gets loaded dynamically.

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        • Christian EhrlicherC Christian Ehrlicher

          @EugeneT said in Model View:

          Do you know a decision how to fix it?

          I would say - fix your model or don't add more than maybe 100k items to it.

          E Offline
          E Offline
          EugeneT
          wrote on last edited by
          #4

          @Christian-Ehrlicher , hello. I thought that Qt doesn't use or handle items which aren't visible, and it doesn't matter how many items you insert into a view. Approximately 100k items and the app is slow

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          • gde23G gde23

            You can try to implement fetchMore() for your model, so only the data that you want to see gets loaded dynamically.

            E Offline
            E Offline
            EugeneT
            wrote on last edited by
            #5

            @gde23 thanks, I'll try your decision

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