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Using QAbstractItemModel in Models that haven't any list.

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    overlord
    wrote on 12 Aug 2019, 15:28 last edited by
    #1

    I want to show instant datas like speed,coordinate etc. on ui that I designed with Qml and I want to use model class derived from QAbstractItemModel.

    But as I understand it,QAbstractItemModel designed for class that have table,list ... elements.
    How can I use it for my design?

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      SGaist
      Lifetime Qt Champion
      wrote on 12 Aug 2019, 18:18 last edited by SGaist 8 Dec 2019, 21:44
      #2

      Hi,

      From the looks of it, it seems you rather want a QObject based class with various Q_PROPERTY for the values you want to show.

      In any case, you should give more details about the data source and what you plan to show.

      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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        overlord
        wrote on 12 Aug 2019, 18:32 last edited by
        #3

        There are datas from ethernet include sensor data and gps information. I want to show all sensor datas on a chart and actual gps information on some labels and a map.
        Do you have any suggestion for this scenario?

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          SGaist
          Lifetime Qt Champion
          wrote on 12 Aug 2019, 18:36 last edited by
          #4

          So you have a list with two columns:

          • Sensor name
          • Sensor value

          Correct ?

          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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            overlord
            wrote on 12 Aug 2019, 19:41 last edited by
            #5

            No. I have a one sensor. I want to show all output on a chart,actual(last) gps info(speed,course,time,hdop,pdop etc. on labels and actual(last) coordinate on map. Previous GPS datas will not be stored.

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              SGaist
              Lifetime Qt Champion
              wrote on 12 Aug 2019, 20:05 last edited by
              #6

              So you have some form of history you want to show ?

              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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                overlord
                wrote on 12 Aug 2019, 20:18 last edited by
                #7

                No,I haven't.

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                  SGaist
                  Lifetime Qt Champion
                  wrote on 12 Aug 2019, 20:37 last edited by
                  #8

                  I fail to see the use of chart for that then. Do you have a drawing of the UI you want to make ?

                  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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                    overlord
                    wrote on 12 Aug 2019, 20:49 last edited by
                    #9

                    Actually I wonder that can I use QAbstractItemModel for model that generate instant data. So view of that model will show only actual instant data.
                    Can I use QAbstractListModel for this purpose.That model have only one row and I will update that row periodically because I want to show only one data at the same time.
                    Is this usage correct?

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                      SGaist
                      Lifetime Qt Champion
                      wrote on 12 Aug 2019, 21:04 last edited by
                      #10

                      You can use it that way. It likely overkill but you can do it.

                      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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                        overlord
                        wrote on 12 Aug 2019, 21:15 last edited by
                        #11

                        Or, should I use model derived from QObject and define variable that accessed from qml with Q_PROPERTY.
                        I have never use qml for commercial project before.Therefore I am invastigating proper way to use model/view pattern.

                        J 1 Reply Last reply 12 Aug 2019, 21:48
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                        • O overlord
                          12 Aug 2019, 21:15

                          Or, should I use model derived from QObject and define variable that accessed from qml with Q_PROPERTY.
                          I have never use qml for commercial project before.Therefore I am invastigating proper way to use model/view pattern.

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                          JKSH
                          Moderators
                          wrote on 12 Aug 2019, 21:48 last edited by JKSH
                          #12

                          @overlord said in Using QAbstractItemModel in Models that haven't any list.:

                          I am invastigating proper way to use model/view pattern.

                          The model/view pattern in Qt is designed for cases where you have an arbitrary number of rows of data. Your sensors don't quite match this use-case. Therefore, the model/view pattern is not suitable for your sensors.

                          I suggest you choose the right tool for the job: Just use a data structure for your sensors, like @SGaist suggested.

                          If you want to investigate how to use the model/view pattern, try implementing a model with rows. For example, an address book.

                          Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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