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Reimplementing QFileSystemModel Checkboxes using QMap inconsistent results

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  • moffa13M Offline
    moffa13M Offline
    moffa13
    wrote on last edited by
    #5

    Any help please

    mrjjM 1 Reply Last reply
    0
    • 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.

      1 Reply Last reply
      1
      • 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
                0
                • 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
                  0
                  • 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
                    0
                    • 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
                      0
                      • 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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