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QStandardItemModel appendRow doesn't update QML TreeView

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qt quickmodeltreeview
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  • BitteWendenB Offline
    BitteWendenB Offline
    BitteWenden
    wrote on last edited by
    #9

    Do I need to tell my view somehow that the model got updated?

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

      I'd emit dataChanged with the new index passing your custom roles.

      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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      • BitteWendenB Offline
        BitteWendenB Offline
        BitteWenden
        wrote on last edited by
        #11

        I added emit dataChanged(QModelIndex(), QModelIndex(), roles); after my appendRow, which should update the whole view(?), but it still doesn't work.

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        • BitteWendenB Offline
          BitteWendenB Offline
          BitteWenden
          wrote on last edited by
          #12

          This is my whole class right now, in case that helps:

          ProjectTreeModel::ProjectTreeModel(QObject *parent) :
              QStandardItemModel(parent)
          {
          
              m_roleNameMapping[ProjectTreeModel_Role_Name] = "name_role";
              m_roleNameMapping[ProjectTreeModel_Role_Type] = "type_role";
              m_roleNameMapping[ProjectTreeModel_Role_Icon] = "icon_role";
          
          
          }
          
          void ProjectTreeModel::addRootEntry( const QString& name, const QString& type, const QString& icon)
          {
              auto rootEntry = new QStandardItem( name );
          
              rootEntry->setData( icon, ProjectTreeModel_Role_Icon );
              rootEntry->setData( type, ProjectTreeModel_Role_Type );
              rootEntry->setData( name, ProjectTreeModel_Role_Name );
          
              invisibleRootItem()->appendRow(rootEntry);
              qDebug() << rootEntry;
              qDebug() << this->rowCount();
          
              QVector<int> vector(0);
              vector.append(ProjectTreeModel_Role_Icon);
              vector.append(ProjectTreeModel_Role_Type);
              vector.append(ProjectTreeModel_Role_Name);
          
              emit dataChanged(QModelIndex(), QModelIndex(), vector);
          }
          
          
          QHash<int, QByteArray> ProjectTreeModel::roleNames() const
          {
              return m_roleNameMapping;
          }
          
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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #13

            AFAIK, no. You are passing two invalid indexes. If you want to trigger a refresh, give the top left and bottom right indexes of the part of the model that should get refreshed on the view.

            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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            • BitteWendenB Offline
              BitteWendenB Offline
              BitteWenden
              wrote on last edited by
              #14

              Okay, tried it with emit dataChanged(invisibleRootItem()->index(), rootEntry->index(), vector); which should work, but it doesn't.

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              • BitteWendenB Offline
                BitteWendenB Offline
                BitteWenden
                wrote on last edited by
                #15

                Or at least I think that should update everything from the root item to the newly created entry.

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #16

                  How are you adding that new row outside the constructor ?

                  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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                  • BitteWendenB Offline
                    BitteWendenB Offline
                    BitteWenden
                    wrote on last edited by
                    #17

                    With the appendRow() method (on the invisible root item) as mentioned earlier.

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #18

                      I meant, where are you calling appendRow ?

                      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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                      • BitteWendenB Offline
                        BitteWendenB Offline
                        BitteWenden
                        wrote on last edited by
                        #19

                        In a function that is called in response to a button click. (that function calls addRootItem multiple times)

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                        • OrkbluttO Offline
                          OrkbluttO Offline
                          Orkblutt
                          wrote on last edited by Orkblutt
                          #20

                          What about using beginInsertRows() / endInsertRow() ?

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                          • BitteWendenB Offline
                            BitteWendenB Offline
                            BitteWenden
                            wrote on last edited by
                            #21

                            That doesn't seem to work either.

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                            • BitteWendenB Offline
                              BitteWendenB Offline
                              BitteWenden
                              wrote on last edited by
                              #22

                              Does anyone know of some piece of sample code for a dynamic model with Qt Quick and QStandardItemModel where you can add rows and edit items after the construction?

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                              • BitteWendenB Offline
                                BitteWendenB Offline
                                BitteWenden
                                wrote on last edited by
                                #23

                                Oh, Damnit. I had a ProjectTreeViewModel { id:projecttreeviewmodel } in my UI components and used that instead of my treeviewmodel added as a context property.

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                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #24

                                  Sneaky one !

                                  Glad you found out :)

                                  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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