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Reimplementing QFileSystemModel Checkboxes using QMap inconsistent results

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  • moffa13M moffa13

    Any help please

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #6

    @moffa13
    Add some qDebug() statement to see what index are sent and what it set pr index.
    I think its one of those cases where debugger and tools are more useful than guessing looking at code.

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    • moffa13M Offline
      moffa13M Offline
      moffa13
      wrote on last edited by
      #7

      @mrjj said in Reimplementing QFileSystemModel Checkboxes using QMap inconsistent results:

      @moffa13
      Add some qDebug() statement to see what index are sent and what it set pr index.
      I think its one of those cases where debugger and tools are more useful than guessing looking at code.

      If it was that simple I wouldn't have asked.

      qDebug is showing me correct paths before calling setData. The problem is that for whatever reason, some checkboxes won't get checked. I almost always get a different result whenever I run this code.

      qDebug in setData tells me that the function receives Qt::Checked but it's not the case.

      mrjjM 1 Reply Last reply
      0
      • moffa13M moffa13

        @mrjj said in Reimplementing QFileSystemModel Checkboxes using QMap inconsistent results:

        @moffa13
        Add some qDebug() statement to see what index are sent and what it set pr index.
        I think its one of those cases where debugger and tools are more useful than guessing looking at code.

        If it was that simple I wouldn't have asked.

        qDebug is showing me correct paths before calling setData. The problem is that for whatever reason, some checkboxes won't get checked. I almost always get a different result whenever I run this code.

        qDebug in setData tells me that the function receives Qt::Checked but it's not the case.

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #8

        @moffa13
        Hi
        Hmm, i would suspect the QSet<QPersistentModelIndex>
        could contain incorrect indexes.
        Im wondering if QFileSystemModel might invalidate QPersistentModelIndexes i have seen with QSqlTableModel.

        moffa13M 1 Reply Last reply
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        • mrjjM mrjj

          @moffa13
          Hi
          Hmm, i would suspect the QSet<QPersistentModelIndex>
          could contain incorrect indexes.
          Im wondering if QFileSystemModel might invalidate QPersistentModelIndexes i have seen with QSqlTableModel.

          moffa13M Offline
          moffa13M Offline
          moffa13
          wrote on last edited by
          #9

          @mrjj It only has this behavior when I use QMap if I do this with QSet everything works fine. That's what I don't get

          mrjjM 1 Reply Last reply
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          • moffa13M moffa13

            @mrjj It only has this behavior when I use QMap if I do this with QSet everything works fine. That's what I don't get

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #10

            @moffa13
            Hmm. yes that is odd.
            One difference with Set/QMap is if u ask QMap for non existing value
            a default-constructed value is returned but you seem to check with contains so
            should not happen?

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            • moffa13M Offline
              moffa13M Offline
              moffa13
              wrote on last edited by
              #11

              @mrjj

              Yeah, exactly, for me it should work.

              However I noticed something which may be useful. I added a QEventLoop when doing setData to look for the dataChanged signal but when I do this and I use qDebug to show the files returned by model::index, I get something like this :

              Normal dir is
              a.txt
              b.txt
              c.txt

              filePath in the loop returns this :

              a.txt
              b.txt
              b.txt

              And c.txt does not get checked which is also odd.

              mrjjM 1 Reply Last reply
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              • moffa13M moffa13

                @mrjj

                Yeah, exactly, for me it should work.

                However I noticed something which may be useful. I added a QEventLoop when doing setData to look for the dataChanged signal but when I do this and I use qDebug to show the files returned by model::index, I get something like this :

                Normal dir is
                a.txt
                b.txt
                c.txt

                filePath in the loop returns this :

                a.txt
                b.txt
                b.txt

                And c.txt does not get checked which is also odd.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #12

                @moffa13
                Hmm. you know how b.txt is included twice ?

                moffa13M 1 Reply Last reply
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                • mrjjM mrjj

                  @moffa13
                  Hmm. you know how b.txt is included twice ?

                  moffa13M Offline
                  moffa13M Offline
                  moffa13
                  wrote on last edited by
                  #13

                  @mrjj this is absolutely not normal. It' a for loop iterating from 0 to rowCount(parent). Then it uses model->index(i, 0, parent). So this is not possible to output twice the same file.

                  mrjjM 1 Reply Last reply
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                  • moffa13M moffa13

                    @mrjj this is absolutely not normal. It' a for loop iterating from 0 to rowCount(parent). Then it uses model->index(i, 0, parent). So this is not possible to output twice the same file.

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #14

                    @moffa13
                    Could you try to do the same for loop from say a button and use
                    no localEvent loop or anything like that and see if its
                    reproducible in other context ?

                    1 Reply Last reply
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                    • moffa13M Offline
                      moffa13M Offline
                      moffa13
                      wrote on last edited by
                      #15

                      Ok I found what was causing this awful bug.

                      When I check if the map contains the index, I actually check the raw index not the QPersistantModelIndex so this is not the same object and I think qmap does not check equality using == operator .

                      So I have to iterate over the map and check using QPersistantModelIndex "==" operators which can compare from a QModelIndex.

                      1 Reply Last reply
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