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Using a custom data type and editor in QStandardItemModel

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  • C Online
    C Online
    Christian Ehrlicher
    Lifetime Qt Champion
    wrote on 16 Oct 2019, 17:21 last edited by
    #2

    How do you set the data? Please show some code.

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    L 1 Reply Last reply 16 Oct 2019, 17:32
    0
    • C Christian Ehrlicher
      16 Oct 2019, 17:21

      How do you set the data? Please show some code.

      L Offline
      L Offline
      Lurkki
      wrote on 16 Oct 2019, 17:32 last edited by Lurkki
      #3

      @Christian-Ehrlicher
      Setting the data initially:

          std::function<void(tc_assignable_node_t*, QStandardItem*)> traverse;
          traverse = [=, &traverse](tc_assignable_node_t *node, QStandardItem *item) {
              if (node == NULL) {
                  return;
              }
              
              if (node->name != NULL) { 
                  qDebug() << node->name;
              }
              
              // List for adding the name and editor on the same row
              QList <QStandardItem*> rowItems;
              
              QStandardItem *nameItem = new QStandardItem;
              nameItem->setText(node->name);
              nameItem->setEditable(false);
              rowItems.append(nameItem);
              
              // Don't add editor item for TC_ASSIGNABLE_NONE nodes
              if (node->value_category != TC_ASSIGNABLE_NONE) {
                  QStandardItem *editorItem = new QStandardItem;
                  QVariant v;
                  AssignableData data(node);
                  v.setValue(data);
                  editorItem->setData(v, Qt::EditRole);
                  //editorItem->setText(node->name);
                  rowItems.append(editorItem);
              }
              
              item->appendRow(rowItems);
              
              for (uint32_t i = 0; i < node->children_count; i++) {
                  traverse(node->children_nodes[i], nameItem);
              }
          };
      

      setModelData() of my delegate:

          AssignableData data = qvariant_cast<AssignableData>(index.model()->data(index));
          QVariant v;
          QStandardItemModel *s_model = static_cast<QStandardItemModel*>(model);
      ...
      IntRangeEditor *ed = static_cast<IntRangeEditor*>(editor);
                          data.setValue(ed->value());
                          v.setValue(data);
                          s_model->setData(index, v, Qt::EditRole);
                          //s_model->itemFromIndex(index)->setText("");
      

      without the last line uncommented, it seems to overwrite the item's entire data and it becomes ineditable

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      • C Online
        C Online
        Christian Ehrlicher
        Lifetime Qt Champion
        wrote on 16 Oct 2019, 18:04 last edited by
        #4

        @Lurkki said in Using a custom data type and editor in QStandardItemModel:

        without the last line uncommented,

        You mean '//s_model->itemFromIndex(index)->setText("");' ?
        This will set the Qt::DisplayRole and Qt::EditRole as explained in the documentation

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        Visit the Qt Academy at https://academy.qt.io/catalog

        L 1 Reply Last reply 16 Oct 2019, 19:16
        1
        • C Christian Ehrlicher
          16 Oct 2019, 18:04

          @Lurkki said in Using a custom data type and editor in QStandardItemModel:

          without the last line uncommented,

          You mean '//s_model->itemFromIndex(index)->setText("");' ?
          This will set the Qt::DisplayRole and Qt::EditRole as explained in the documentation

          L Offline
          L Offline
          Lurkki
          wrote on 16 Oct 2019, 19:16 last edited by
          #5

          @Christian-Ehrlicher s_model->setData(index,"a", Qt::DisplayRole); has the same effect, it overwrites my custom data

          C 1 Reply Last reply 16 Oct 2019, 20:09
          0
          • M Offline
            M Offline
            mrjj
            Lifetime Qt Champion
            wrote on 16 Oct 2019, 19:35 last edited by
            #6

            Hi
            I might have missed something but i only see you using
            Qt::EditRole
            so where is this custom data stored and in what way
            "becomes ineditable" its still shown but you can type in it or ?

            L 1 Reply Last reply 16 Oct 2019, 19:54
            0
            • M mrjj
              16 Oct 2019, 19:35

              Hi
              I might have missed something but i only see you using
              Qt::EditRole
              so where is this custom data stored and in what way
              "becomes ineditable" its still shown but you can type in it or ?

              L Offline
              L Offline
              Lurkki
              wrote on 16 Oct 2019, 19:54 last edited by
              #7

              @mrjj My mistake, yeah I can edit it but my custom data disappears. The data is stored in the model.

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              • L Lurkki
                16 Oct 2019, 19:16

                @Christian-Ehrlicher s_model->setData(index,"a", Qt::DisplayRole); has the same effect, it overwrites my custom data

                C Online
                C Online
                Christian Ehrlicher
                Lifetime Qt Champion
                wrote on 16 Oct 2019, 20:09 last edited by
                #8

                @Lurkki said in Using a custom data type and editor in QStandardItemModel:

                has the same effect, it overwrites my custom data

                I would say it's a bug if it's not - see the documentation...

                Note: The default implementation treats Qt::EditRole and Qt::DisplayRole as referring to the same data.

                Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                Visit the Qt Academy at https://academy.qt.io/catalog

                L 1 Reply Last reply 16 Oct 2019, 20:58
                0
                • C Christian Ehrlicher
                  16 Oct 2019, 20:09

                  @Lurkki said in Using a custom data type and editor in QStandardItemModel:

                  has the same effect, it overwrites my custom data

                  I would say it's a bug if it's not - see the documentation...

                  Note: The default implementation treats Qt::EditRole and Qt::DisplayRole as referring to the same data.

                  L Offline
                  L Offline
                  Lurkki
                  wrote on 16 Oct 2019, 20:58 last edited by Lurkki
                  #9

                  @Christian-Ehrlicher How should I go about subclassing QStandardItem and reimplementing setData then? I can't seem to find much information about it.

                  M 1 Reply Last reply 18 Oct 2019, 11:16
                  0
                  • L Lurkki
                    16 Oct 2019, 20:58

                    @Christian-Ehrlicher How should I go about subclassing QStandardItem and reimplementing setData then? I can't seem to find much information about it.

                    M Offline
                    M Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on 18 Oct 2019, 11:16 last edited by mrjj
                    #10

                    @Lurkki

                    Hi
                    Can you please make a small example showing this ?,

                    I have a bad feeling its just incorrect use / expectations and
                    not an actual bug.

                    Qt::EditRole and Qt::DisplayRole is the same so that is expected.

                    try to use Qt::UserRole for your custom data end see.

                    To use custom data, you can use

                    setData(index,"a", Qt::UserRole );
                    setData(index,"a", Qt::UserRole +1);
                    setData(index,"a", Qt::UserRole +2);

                    L 1 Reply Last reply 24 Oct 2019, 11:46
                    2
                    • M mrjj
                      18 Oct 2019, 11:16

                      @Lurkki

                      Hi
                      Can you please make a small example showing this ?,

                      I have a bad feeling its just incorrect use / expectations and
                      not an actual bug.

                      Qt::EditRole and Qt::DisplayRole is the same so that is expected.

                      try to use Qt::UserRole for your custom data end see.

                      To use custom data, you can use

                      setData(index,"a", Qt::UserRole );
                      setData(index,"a", Qt::UserRole +1);
                      setData(index,"a", Qt::UserRole +2);

                      L Offline
                      L Offline
                      Lurkki
                      wrote on 24 Oct 2019, 11:46 last edited by Lurkki
                      #11

                      @mrjj Thanks, that works for my use case

                      Setting the data:

                              if (node->value_category != TC_ASSIGNABLE_NONE) {
                                  QStandardItem *editorItem = new QStandardItem;
                                  QVariant v;
                                  AssignableData data(node);
                                  v.setValue(data);
                                  editorItem->setData(v, Qt::UserRole);
                                  //editorItem->setText(node->name);
                                  rowItems.append(editorItem);
                              }
                      
                      

                      Setting editor data in the delegate:

                      void AssignableEditorDelegate::setEditorData(QWidget* editor, const QModelIndex &index) const {
                          AssignableData data = qvariant_cast<AssignableData>(index.model()->data(index, Qt::UserRole));
                          
                          switch (data.m_valueCategory) {
                              case TC_ASSIGNABLE_RANGE:
                                  switch (data.m_rangeInfo.range_data_type) {
                                      case TC_ASSIGNABLE_RANGE_INT: {
                                          IntRangeEditor *ed = static_cast<IntRangeEditor*>(editor);
                                          ed->setValue(data.value().toInt());
                                          break;
                                      }
                                      default:
                                          break;
                                  }
                              default:
                                  break;
                          }
                      }
                      

                      Setting model data:

                      void AssignableEditorDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const {
                          AssignableData data = qvariant_cast<AssignableData>(index.model()->data(index, Qt::UserRole));
                          QVariant v;
                          QStandardItemModel *s_model = static_cast<QStandardItemModel*>(model);
                          
                          switch (data.m_valueCategory) {
                              ...
                              case TC_ASSIGNABLE_RANGE:
                                  switch (data.m_rangeInfo.range_data_type) {
                                      case TC_ASSIGNABLE_RANGE_INT: {
                                          IntRangeEditor *ed = static_cast<IntRangeEditor*>(editor);
                                          data.setValue(ed->value());
                                          v.setValue(data);
                                          s_model->setData(index, v, Qt::UserRole);
                                          s_model->setData(index, ed->value(), Qt::DisplayRole);
                                          break;
                                          }
                                      default:
                                          break;
                                  }
                              default:
                                  break;
                          }
                      }
                      

                      I also had to do setAutoFillBackground(true); in my editor widget to make the display text not overlap with the editor.

                      1 Reply Last reply
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                      24 Oct 2019, 11:46

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