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Changes in table with combo boxes

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  • K koahnig

    @VRonin

    Thanks for help

    You are listing a number of classes, I have not used before. Therefore, it is easy to get lost.

    Do you have a small example?

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by mrjj
    #4

    @koahnig
    Hi
    I think this could be good ?
    https://wiki.qt.io/Combo_Boxes_in_Item_Views

    Note that is does
    if (index.column() != 1) checks which is not super design.
    Much better with setItemDelegateForColumn than check internally on col as it
    breaks so easy with sorting etc and ties the delegate to the model.

    K 1 Reply Last reply
    2
    • mrjjM mrjj

      @koahnig
      Hi
      I think this could be good ?
      https://wiki.qt.io/Combo_Boxes_in_Item_Views

      Note that is does
      if (index.column() != 1) checks which is not super design.
      Much better with setItemDelegateForColumn than check internally on col as it
      breaks so easy with sorting etc and ties the delegate to the model.

      K Offline
      K Offline
      koahnig
      wrote on last edited by
      #5

      @mrjj

      I am playing already with the example code and found that it does add a combo box only in second col. Was a lucky shot to start there ;)

      This is certainly a very good start.

      PS: I will leave the thread open, if there are follow up questions. I am pretty sure that someone is going tokick me, if I forget to mark as solved ;)

      Vote the answer(s) that helped you to solve your issue(s)

      mrjjM 1 Reply Last reply
      0
      • K koahnig

        @mrjj

        I am playing already with the example code and found that it does add a combo box only in second col. Was a lucky shot to start there ;)

        This is certainly a very good start.

        PS: I will leave the thread open, if there are follow up questions. I am pretty sure that someone is going tokick me, if I forget to mark as solved ;)

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

        @koahnig

        Hi, ok super !
        If you have not played with delegates before, there will be questions.
        Or at least i had many :)

        1 Reply Last reply
        0
        • VRoninV Offline
          VRoninV Offline
          VRonin
          wrote on last edited by VRonin
          #7

          This is a small class from one of my projects. It supports Qt::EditRole and Qt::UserRole. It also automatically sorts the entries (which I'm unsure if it's something you want). You'll just have to change createEditor slightly to allow the combobox to be typed into

          header

          #ifndef COMBOBOXDELEGATE_H
          #define COMBOBOXDELEGATE_H
          
          #include <QStyledItemDelegate>
          #include <QString>
          class QComboBox;
          class QStandardItemModel;
          class QSortFilterProxyModel;
          class ComboBoxDelegate : public QStyledItemDelegate
          {
              Q_OBJECT
              Q_DISABLE_COPY(ComboBoxDelegate)
          public:
              explicit ComboBoxDelegate(QObject *parent = Q_NULLPTR);
              virtual QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
              virtual void setEditorData(QWidget *editor, const QModelIndex &index) const override;
              virtual void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const override;
              virtual void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
              virtual QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index)  const override;
              virtual void clear();
              virtual void addItem(const QString& txt, const QVariant& val);
              virtual void addItem(const QString& txt);
              virtual QString textForData(const QVariant& val);
              virtual void setItemData(int index, const QVariant& data, int role=256);
              virtual QVariant itemData(int index, int role = 256);
              virtual void removeItem(int index);
              virtual int findText(const QString & text) const;
              virtual int findData(const QVariant & data, int role = Qt::UserRole) const;
          protected:
              QStandardItemModel* m_comboModel;
              QSortFilterProxyModel* m_comboProxy;
          };
          
          #endif // COMBOBOXDELEGATE_H
          

          source

          #include "ComboBoxDelegate.h"
          #include <QComboBox>
          #include <QStandardItemModel>
          #include <QApplication>
          #include <QSortFilterProxyModel>
          ComboBoxDelegate::ComboBoxDelegate(QObject *parent)
              : QStyledItemDelegate(parent)
          {
              m_comboModel = new QStandardItemModel(this);
              m_comboModel->insertColumn(0);
              m_comboProxy = new QSortFilterProxyModel(this);
              m_comboProxy->setSourceModel(m_comboModel);
          }
          
          QWidget* ComboBoxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &, const QModelIndex &) const
          {
              QComboBox* result = new QComboBox(parent);
              m_comboProxy->sort(0);
              result->setModel(m_comboProxy);
              return result;
          }
          
          void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
          {
              if (index.data(Qt::EditRole).isNull())
                  qobject_cast<QComboBox*>(editor)->setCurrentIndex(-1);
              else
                  qobject_cast<QComboBox*>(editor)->setCurrentText(index.model()->data(index, Qt::EditRole).toString());
          }
          
          void ComboBoxDelegate::clear()
          {
              m_comboModel->removeRows(0,m_comboModel->rowCount());
          }
          
          void ComboBoxDelegate::addItem(const QString& txt, const QVariant& val)
          {
              m_comboModel->insertRow(m_comboModel->rowCount());
              m_comboModel->setData(m_comboModel->index(m_comboModel->rowCount()-1,0),txt);
              m_comboModel->setData(m_comboModel->index(m_comboModel->rowCount() - 1, 0), val,Qt::UserRole);
          }
          
          void ComboBoxDelegate::addItem(const QString& txt)
          {
              addItem(txt, QVariant());
          }
          
          QString ComboBoxDelegate::textForData(const QVariant& val)
          {
              for (int i = 0; i < m_comboModel->rowCount();++i){
                  if (m_comboModel->index(i, 0).data(Qt::UserRole) == val)
                      return m_comboModel->index(i, 0).data().toString();
              }
              return QString();
          }
          
          void ComboBoxDelegate::setItemData(int index, const QVariant& data, int role)
          {
              if (index < 0 || index >= m_comboProxy->rowCount())
                  return;
              m_comboModel->setData(m_comboProxy->mapToSource(m_comboProxy->index(index, 0)), data, role);
          }
          
          QVariant ComboBoxDelegate::itemData(int index, int role)
          {
              if (index < 0 || index >= m_comboProxy->rowCount())
                  return QVariant();
              return m_comboProxy->index(index, 0).data(role);
          }
          
          void ComboBoxDelegate::removeItem(int index)
          {
              if (index < 0 || index >= m_comboProxy->rowCount())
                  return;
              m_comboModel->removeRow(m_comboProxy->mapToSource(m_comboProxy->index(index,0)).row());
          }
          
          int ComboBoxDelegate::findText(const QString & text) const
          {
              for (int i = 0; i < m_comboProxy->rowCount(); ++i) {
                  if (m_comboProxy->index(i, 0).data().toString().compare(text, Qt::CaseInsensitive) == 0)
                      return i;
              }
              return -1;
          }
          
          int ComboBoxDelegate::findData(const QVariant & data, int role /*= Qt::UserRole*/) const
          {
              for (int i = 0; i < m_comboProxy->rowCount(); ++i) {
                  if (m_comboProxy->index(i, 0).data(role) == data)
                      return i;
              }
              return -1;
          }
          
          void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
          {
              auto combo = qobject_cast<QComboBox*>(editor);
              if (combo->currentIndex() < 0) {
                  model->setData(index, QVariant(), Qt::EditRole);
                  model->setData(index, QVariant(), Qt::UserRole);
              }
              else {
                  model->setData(index, combo->currentText(), Qt::EditRole);
                  model->setData(index, combo->currentData(), Qt::UserRole);
              }
          }
          void ComboBoxDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &) const
          {
              editor->setGeometry(option.rect);
          }
          
          QSize ComboBoxDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &) const
          {
              int MaxWid = 0;
              for (int i = 0; i < m_comboProxy->rowCount(); ++i) {
                  const int optWid = option.fontMetrics.width(displayText(m_comboProxy->index(i, 0).data(),QLocale()));
                  if (optWid>MaxWid)
                      MaxWid = optWid;
              }
              return qApp->style()->sizeFromContents(
                  QStyle::CT_ComboBox,
                  &option,
                  QSize(MaxWid, option.fontMetrics.height())
                  );
          }
          

          "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
          ~Napoleon Bonaparte

          On a crusade to banish setIndexWidget() from the holy land of Qt

          K 1 Reply Last reply
          4
          • VRoninV VRonin

            This is a small class from one of my projects. It supports Qt::EditRole and Qt::UserRole. It also automatically sorts the entries (which I'm unsure if it's something you want). You'll just have to change createEditor slightly to allow the combobox to be typed into

            header

            #ifndef COMBOBOXDELEGATE_H
            #define COMBOBOXDELEGATE_H
            
            #include <QStyledItemDelegate>
            #include <QString>
            class QComboBox;
            class QStandardItemModel;
            class QSortFilterProxyModel;
            class ComboBoxDelegate : public QStyledItemDelegate
            {
                Q_OBJECT
                Q_DISABLE_COPY(ComboBoxDelegate)
            public:
                explicit ComboBoxDelegate(QObject *parent = Q_NULLPTR);
                virtual QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
                virtual void setEditorData(QWidget *editor, const QModelIndex &index) const override;
                virtual void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const override;
                virtual void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
                virtual QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index)  const override;
                virtual void clear();
                virtual void addItem(const QString& txt, const QVariant& val);
                virtual void addItem(const QString& txt);
                virtual QString textForData(const QVariant& val);
                virtual void setItemData(int index, const QVariant& data, int role=256);
                virtual QVariant itemData(int index, int role = 256);
                virtual void removeItem(int index);
                virtual int findText(const QString & text) const;
                virtual int findData(const QVariant & data, int role = Qt::UserRole) const;
            protected:
                QStandardItemModel* m_comboModel;
                QSortFilterProxyModel* m_comboProxy;
            };
            
            #endif // COMBOBOXDELEGATE_H
            

            source

            #include "ComboBoxDelegate.h"
            #include <QComboBox>
            #include <QStandardItemModel>
            #include <QApplication>
            #include <QSortFilterProxyModel>
            ComboBoxDelegate::ComboBoxDelegate(QObject *parent)
                : QStyledItemDelegate(parent)
            {
                m_comboModel = new QStandardItemModel(this);
                m_comboModel->insertColumn(0);
                m_comboProxy = new QSortFilterProxyModel(this);
                m_comboProxy->setSourceModel(m_comboModel);
            }
            
            QWidget* ComboBoxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &, const QModelIndex &) const
            {
                QComboBox* result = new QComboBox(parent);
                m_comboProxy->sort(0);
                result->setModel(m_comboProxy);
                return result;
            }
            
            void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
            {
                if (index.data(Qt::EditRole).isNull())
                    qobject_cast<QComboBox*>(editor)->setCurrentIndex(-1);
                else
                    qobject_cast<QComboBox*>(editor)->setCurrentText(index.model()->data(index, Qt::EditRole).toString());
            }
            
            void ComboBoxDelegate::clear()
            {
                m_comboModel->removeRows(0,m_comboModel->rowCount());
            }
            
            void ComboBoxDelegate::addItem(const QString& txt, const QVariant& val)
            {
                m_comboModel->insertRow(m_comboModel->rowCount());
                m_comboModel->setData(m_comboModel->index(m_comboModel->rowCount()-1,0),txt);
                m_comboModel->setData(m_comboModel->index(m_comboModel->rowCount() - 1, 0), val,Qt::UserRole);
            }
            
            void ComboBoxDelegate::addItem(const QString& txt)
            {
                addItem(txt, QVariant());
            }
            
            QString ComboBoxDelegate::textForData(const QVariant& val)
            {
                for (int i = 0; i < m_comboModel->rowCount();++i){
                    if (m_comboModel->index(i, 0).data(Qt::UserRole) == val)
                        return m_comboModel->index(i, 0).data().toString();
                }
                return QString();
            }
            
            void ComboBoxDelegate::setItemData(int index, const QVariant& data, int role)
            {
                if (index < 0 || index >= m_comboProxy->rowCount())
                    return;
                m_comboModel->setData(m_comboProxy->mapToSource(m_comboProxy->index(index, 0)), data, role);
            }
            
            QVariant ComboBoxDelegate::itemData(int index, int role)
            {
                if (index < 0 || index >= m_comboProxy->rowCount())
                    return QVariant();
                return m_comboProxy->index(index, 0).data(role);
            }
            
            void ComboBoxDelegate::removeItem(int index)
            {
                if (index < 0 || index >= m_comboProxy->rowCount())
                    return;
                m_comboModel->removeRow(m_comboProxy->mapToSource(m_comboProxy->index(index,0)).row());
            }
            
            int ComboBoxDelegate::findText(const QString & text) const
            {
                for (int i = 0; i < m_comboProxy->rowCount(); ++i) {
                    if (m_comboProxy->index(i, 0).data().toString().compare(text, Qt::CaseInsensitive) == 0)
                        return i;
                }
                return -1;
            }
            
            int ComboBoxDelegate::findData(const QVariant & data, int role /*= Qt::UserRole*/) const
            {
                for (int i = 0; i < m_comboProxy->rowCount(); ++i) {
                    if (m_comboProxy->index(i, 0).data(role) == data)
                        return i;
                }
                return -1;
            }
            
            void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
            {
                auto combo = qobject_cast<QComboBox*>(editor);
                if (combo->currentIndex() < 0) {
                    model->setData(index, QVariant(), Qt::EditRole);
                    model->setData(index, QVariant(), Qt::UserRole);
                }
                else {
                    model->setData(index, combo->currentText(), Qt::EditRole);
                    model->setData(index, combo->currentData(), Qt::UserRole);
                }
            }
            void ComboBoxDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &) const
            {
                editor->setGeometry(option.rect);
            }
            
            QSize ComboBoxDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &) const
            {
                int MaxWid = 0;
                for (int i = 0; i < m_comboProxy->rowCount(); ++i) {
                    const int optWid = option.fontMetrics.width(displayText(m_comboProxy->index(i, 0).data(),QLocale()));
                    if (optWid>MaxWid)
                        MaxWid = optWid;
                }
                return qApp->style()->sizeFromContents(
                    QStyle::CT_ComboBox,
                    &option,
                    QSize(MaxWid, option.fontMetrics.height())
                    );
            }
            
            K Offline
            K Offline
            koahnig
            wrote on last edited by
            #8

            @VRonin

            Thanks for your code.

            I have played, probably better to say messed around, a bit and seem to semi-understand what you are doing there.
            For my trial I have basically used the wiki example and added your ComboBoxDelegate.

            The wiki example starts out with an empty 4 by 10 table.

            When simply adding a line

            results->setEditable(true);
            

            in createEditor I got something to work.
            The only problem was the line

            m_comboProxy->sort(0);
            

            The behaviour of the QComboBox was not as expected. It basically showed only a blank line and last value entered. When choosing a different column, it showed the performance as expected, but that should be wrong, since the number of columns stays at 1. I guess it has to do with the incomplete use of the whole model.

            The moment I will bypass the QSortFilterProxyModel and use directly the instance of the QStandardItemModel instead.

            When I am using your source mostly as is, it provides an increasing list of entries of the whole table already done. Since I need the same basically for column-wise different entries, the solution will be a couple of instances of QStandardItemModel.

            Can you offer an explanation why the sort does not work?

            Vote the answer(s) that helped you to solve your issue(s)

            VRoninV 1 Reply Last reply
            0
            • K koahnig

              @VRonin

              Thanks for your code.

              I have played, probably better to say messed around, a bit and seem to semi-understand what you are doing there.
              For my trial I have basically used the wiki example and added your ComboBoxDelegate.

              The wiki example starts out with an empty 4 by 10 table.

              When simply adding a line

              results->setEditable(true);
              

              in createEditor I got something to work.
              The only problem was the line

              m_comboProxy->sort(0);
              

              The behaviour of the QComboBox was not as expected. It basically showed only a blank line and last value entered. When choosing a different column, it showed the performance as expected, but that should be wrong, since the number of columns stays at 1. I guess it has to do with the incomplete use of the whole model.

              The moment I will bypass the QSortFilterProxyModel and use directly the instance of the QStandardItemModel instead.

              When I am using your source mostly as is, it provides an increasing list of entries of the whole table already done. Since I need the same basically for column-wise different entries, the solution will be a couple of instances of QStandardItemModel.

              Can you offer an explanation why the sort does not work?

              VRoninV Offline
              VRoninV Offline
              VRonin
              wrote on last edited by VRonin
              #9

              @koahnig said in Changes in table with combo boxes:

              Since I need the same basically for column-wise different entries, the solution will be a couple of instances of QStandardItemModel.

              No, just call setItemDelegateForColumn in the view with a different instance of the delegate for every column. This way is more reusable and scalable

              @koahnig said in Changes in table with combo boxes:

              When choosing a different column

              strange, [this] should take care of the resorting. Otherwise use QComboBox::InsertAlphabetically sort policy on the combobox directly

              "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
              ~Napoleon Bonaparte

              On a crusade to banish setIndexWidget() from the holy land of Qt

              K 1 Reply Last reply
              0
              • VRoninV VRonin

                @koahnig said in Changes in table with combo boxes:

                Since I need the same basically for column-wise different entries, the solution will be a couple of instances of QStandardItemModel.

                No, just call setItemDelegateForColumn in the view with a different instance of the delegate for every column. This way is more reusable and scalable

                @koahnig said in Changes in table with combo boxes:

                When choosing a different column

                strange, [this] should take care of the resorting. Otherwise use QComboBox::InsertAlphabetically sort policy on the combobox directly

                K Offline
                K Offline
                koahnig
                wrote on last edited by
                #10

                @VRonin said in Changes in table with combo boxes:

                @koahnig said in Changes in table with combo boxes:

                Since I need the same basically for column-wise different entries, the solution will be a couple of instances of QStandardItemModel.

                No, just call setItemDelegateForColumn in the view with a different instance of the delegate for every column. This way is more reusable and scalable

                Yep, found already that I was thinking too complecated ;)

                @VRonin said in Changes in table with combo boxes:

                @koahnig said in Changes in table with combo boxes:

                When choosing a different column

                strange, [this] should take care of the resorting. Otherwise use QComboBox::InsertAlphabetically sort policy on the combobox directly

                InsertAlphabetically does the trick.

                However, I still have to bypass the proxymodel as in here:

                //#define USE_COMBO_PROXY
                QWidget* ComboBoxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &, const QModelIndex &) const
                {
                    QComboBox* result = new QComboBox(parent);
                    result->setEditable( true );
                    result->setInsertPolicy( QComboBox::InsertAlphabetically );
                
                #ifdef USE_COMBO_PROXY
                    m_comboProxy->sort( 0 );
                    result->setModel(m_comboProxy);
                #else
                    result->setModel(m_comboModel);
                #endif 
                
                    return result;
                }
                

                Vote the answer(s) that helped you to solve your issue(s)

                1 Reply Last reply
                0
                • K Offline
                  K Offline
                  koahnig
                  wrote on last edited by
                  #11

                  Currently I am testing with this class derived from QTablewidget
                  header

                  #ifndef MYTABLEWIDGET_H
                  #define MYTABLEWIDGET_H
                  
                  #include <QTableWidget>
                  
                  class MyTableWidget : public QTableWidget
                  {
                  public:
                      MyTableWidget();
                  
                      void setItem ( int row, int col, const QString & text );
                  };
                  
                  #endif // MYTABLEWIDGET_H
                  

                  Source

                  #include "MyTableWidget.h"
                  
                  #include "ComboBoxDelegate.h"
                  
                  MyTableWidget::MyTableWidget()
                  {
                      ComboBoxDelegate *vr = new ComboBoxDelegate ( this );
                      setColumnCount(4);
                      setItemDelegateForColumn ( 1, vr );
                      setItemDelegateForColumn ( 2, new ComboBoxDelegate ( this ) );
                      setItemDelegateForColumn ( 3, new ComboBoxDelegate ( this ) );
                      setRowCount(10);
                      resize(600,400);
                      setItem ( 1, 0, "test 1 0" );
                      setItem ( 1, 1, "test 1 1" );
                      setItem ( 1, 2, "test 1 2" );
                  
                  }
                  
                  void MyTableWidget::setItem ( int row, int col, const QString & text )
                  {
                      QTableWidget::setItem ( row, col, new QTableWidgetItem ( text ) );
                      ComboBoxDelegate *vr = qobject_cast < ComboBoxDelegate * > ( this->itemDelegateForColumn ( col ) );
                      if ( vr )
                      {
                          vr->addItem ( text, row );
                      }
                  }
                  

                  And a main

                  #include <QApplication>
                  #include "MyTableWidget.h"
                  
                  int main(int argc, char *argv[])
                  {
                      QApplication a(argc, argv);
                  
                      MyTableWidget tw;
                  
                      tw.show();
                  
                      return a.exec();
                  }
                  

                  Vote the answer(s) that helped you to solve your issue(s)

                  1 Reply Last reply
                  0
                  • VRoninV Offline
                    VRoninV Offline
                    VRonin
                    wrote on last edited by VRonin
                    #12

                    You probably need to tweak the setEditorData method. qobject_cast<QComboBox*>(editor)->setCurrentText(index.model()->data(index, Qt::EditRole).toString()); assumes the index.data(Qt::EditRole).toString() is already in the combo box list which might not be the case. change it to:

                    {
                    auto comboEditor =qobject_cast<QComboBox*>(editor);
                    Q_ASSERT(comboEditor);
                    const QString& textToFind = index.data(Qt::EditRole).toString();
                    int itemIdx = comboEditor->findText(textToFind);
                    if(itemIdx<0){
                    comboEditor->addItem(textToFind);
                    itemIdx  = comboEditor->findText(textToFind);
                    }
                    Q_ASSERT(itemIdx>=0);
                    comboEditor->setCurrentIndex(itemIdx);
                    }
                    

                    EDIT fixed compile fail and wrong Q_ASSERT condition

                    "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                    ~Napoleon Bonaparte

                    On a crusade to banish setIndexWidget() from the holy land of Qt

                    K 1 Reply Last reply
                    1
                    • VRoninV VRonin

                      You probably need to tweak the setEditorData method. qobject_cast<QComboBox*>(editor)->setCurrentText(index.model()->data(index, Qt::EditRole).toString()); assumes the index.data(Qt::EditRole).toString() is already in the combo box list which might not be the case. change it to:

                      {
                      auto comboEditor =qobject_cast<QComboBox*>(editor);
                      Q_ASSERT(comboEditor);
                      const QString& textToFind = index.data(Qt::EditRole).toString();
                      int itemIdx = comboEditor->findText(textToFind);
                      if(itemIdx<0){
                      comboEditor->addItem(textToFind);
                      itemIdx  = comboEditor->findText(textToFind);
                      }
                      Q_ASSERT(itemIdx>=0);
                      comboEditor->setCurrentIndex(itemIdx);
                      }
                      

                      EDIT fixed compile fail and wrong Q_ASSERT condition

                      K Offline
                      K Offline
                      koahnig
                      wrote on last edited by
                      #13

                      @VRonin

                      Thanks for update.

                      Unfortunately, the tweaking does not work. setEditorData is a const method. Therefore, the compiler complains about addItem use.

                      Just for completeness. The main tests on my side are on Win 10 and Qt 5.4.2 with MinGW. I have checked it also with Qt 5.9.1 for MinGW. The use of proxy model is always an issue. However, the behaviour is different for both versions.
                      The major issue is for Qt 5.4.2 that ComboBox entries held are 2 text plus a varying number blank lines at top.
                      For Qt 5.9.1 it is the opposite. Apparently, two blank lines at the end and varying number of entries at top, but also some are missing.
                      I am giving up for testing at the time, since my knowledge is not sound enough, yet. Also is the functionality with by-passing of proxy model sufficient for my current use case.

                      However, it is time give the following statements.
                      Even though I am "complaining" about some deficiencies in your code, I see it more as a feedback in case you need some input.
                      Your assistance helped significantly improving my speed in getting a workable solution.

                      A huge thanks for turbo-teaching!!

                      Vote the answer(s) that helped you to solve your issue(s)

                      VRoninV 1 Reply Last reply
                      0
                      • K koahnig

                        @VRonin

                        Thanks for update.

                        Unfortunately, the tweaking does not work. setEditorData is a const method. Therefore, the compiler complains about addItem use.

                        Just for completeness. The main tests on my side are on Win 10 and Qt 5.4.2 with MinGW. I have checked it also with Qt 5.9.1 for MinGW. The use of proxy model is always an issue. However, the behaviour is different for both versions.
                        The major issue is for Qt 5.4.2 that ComboBox entries held are 2 text plus a varying number blank lines at top.
                        For Qt 5.9.1 it is the opposite. Apparently, two blank lines at the end and varying number of entries at top, but also some are missing.
                        I am giving up for testing at the time, since my knowledge is not sound enough, yet. Also is the functionality with by-passing of proxy model sufficient for my current use case.

                        However, it is time give the following statements.
                        Even though I am "complaining" about some deficiencies in your code, I see it more as a feedback in case you need some input.
                        Your assistance helped significantly improving my speed in getting a workable solution.

                        A huge thanks for turbo-teaching!!

                        VRoninV Offline
                        VRoninV Offline
                        VRonin
                        wrote on last edited by
                        #14

                        @koahnig said in Changes in table with combo boxes:

                        the compiler complains about addItem use.

                        you can still copy the entire content of additem in that block or exploit the combo and call comboEditor->addItem instead. also, probably it's worth preventing empty (or even whitespace only) strings to be added

                        The blank lines are weird. you could check what is going on by inquiring m_comboProxy->rowCount()

                        "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                        ~Napoleon Bonaparte

                        On a crusade to banish setIndexWidget() from the holy land of Qt

                        K VRoninV 2 Replies Last reply
                        0
                        • VRoninV VRonin

                          @koahnig said in Changes in table with combo boxes:

                          the compiler complains about addItem use.

                          you can still copy the entire content of additem in that block or exploit the combo and call comboEditor->addItem instead. also, probably it's worth preventing empty (or even whitespace only) strings to be added

                          The blank lines are weird. you could check what is going on by inquiring m_comboProxy->rowCount()

                          K Offline
                          K Offline
                          koahnig
                          wrote on last edited by
                          #15

                          @VRonin

                          Code of setEditorData

                          {
                              auto comboEditor =qobject_cast<QComboBox*>(editor);
                              Q_ASSERT(comboEditor);
                              const QString& textToFind = index.data(Qt::EditRole).toString();
                              int itemIdx = comboEditor->findText(textToFind);
                              if(itemIdx<0){
                                  comboEditor->addItem(textToFind);
                                  itemIdx  = comboEditor->findText(textToFind);
                                  qDebug() << "addItem " << textToFind << " " << itemIdx << " " << m_comboProxy->rowCount() << " " << m_comboProxy->columnCount();
                              }
                              Q_ASSERT ( itemIdx >= 0 );
                              comboEditor->setCurrentIndex(itemIdx);
                              qDebug() << "in combo box " << comboEditor->currentText() << " " << itemIdx << " " << m_comboProxy->rowCount() << " " << m_comboProxy->columnCount();;
                          }
                          

                          Double click on 4, 2
                          Typing "Testing" <enter>
                          Double click on 6, 2
                          Typing "erf"
                          Double click 8, 2
                          Typing "Zufall"

                          output window:

                          Starting r:\build-AnotherComboBoxTest-Desktop_Qt_5_9_1_MinGW_32bit-Debug\debug\AnotherComboBoxTest.exe...
                          addItem  ""   0   2   1
                          in combo box  ""   0   2   1
                          in combo box  "testing"   2   3   1
                          in combo box  "testing"   2   3   1
                          in combo box  ""   0   3   1
                          in combo box  "erf"   1   4   1
                          in combo box  "erf"   1   4   1
                          in combo box  ""   0   4   1
                          in combo box  ""   0   5   1
                          in combo box  ""   0   5   1
                          

                          That's the outcome
                          0_1504276956694_b09f76a4-5adb-4721-b3d9-57667fced486-image.png

                          Vote the answer(s) that helped you to solve your issue(s)

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                          0
                          • VRoninV VRonin

                            @koahnig said in Changes in table with combo boxes:

                            the compiler complains about addItem use.

                            you can still copy the entire content of additem in that block or exploit the combo and call comboEditor->addItem instead. also, probably it's worth preventing empty (or even whitespace only) strings to be added

                            The blank lines are weird. you could check what is going on by inquiring m_comboProxy->rowCount()

                            VRoninV Offline
                            VRoninV Offline
                            VRonin
                            wrote on last edited by VRonin
                            #16

                            Yep, that's what I meant with:

                            @VRonin said in Changes in table with combo boxes:

                            also, probably it's worth preventing empty (or even whitespace only) strings

                            void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
                            {
                                if (index.data(Qt::EditRole).isNull())
                                    qobject_cast<QComboBox*>(editor)->setCurrentIndex(-1);
                                else
                            {
                                auto comboEditor =qobject_cast<QComboBox*>(editor);
                                Q_ASSERT(comboEditor);
                                const QString& textToFind = index.data(Qt::EditRole).toString();
                                //make sure you are not just searching whitespace
                            const QRegularExpression realTextRegExp("\S+");
                            if(!realTextRegExp.match(textToFind).hasMatch()){
                            comboEditor->setCurrentIndex(-1);
                            return;
                            }
                            int itemIdx = comboEditor->findText(textToFind);
                                if(itemIdx<0){
                                    comboEditor->addItem(textToFind);
                                    itemIdx  = comboEditor->findText(textToFind);
                                    qDebug() << "addItem " << textToFind << " " << itemIdx << " " << m_comboProxy->rowCount() << " " << m_comboProxy->columnCount();
                                }
                                Q_ASSERT ( itemIdx >= 0 );
                                comboEditor->setCurrentIndex(itemIdx);
                                qDebug() << "in combo box " << comboEditor->currentText() << " " << itemIdx << " " << m_comboProxy->rowCount() << " " << m_comboProxy->columnCount();
                            }
                            }
                            

                            "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                            ~Napoleon Bonaparte

                            On a crusade to banish setIndexWidget() from the holy land of Qt

                            K 1 Reply Last reply
                            1
                            • VRoninV VRonin

                              Yep, that's what I meant with:

                              @VRonin said in Changes in table with combo boxes:

                              also, probably it's worth preventing empty (or even whitespace only) strings

                              void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
                              {
                                  if (index.data(Qt::EditRole).isNull())
                                      qobject_cast<QComboBox*>(editor)->setCurrentIndex(-1);
                                  else
                              {
                                  auto comboEditor =qobject_cast<QComboBox*>(editor);
                                  Q_ASSERT(comboEditor);
                                  const QString& textToFind = index.data(Qt::EditRole).toString();
                                  //make sure you are not just searching whitespace
                              const QRegularExpression realTextRegExp("\S+");
                              if(!realTextRegExp.match(textToFind).hasMatch()){
                              comboEditor->setCurrentIndex(-1);
                              return;
                              }
                              int itemIdx = comboEditor->findText(textToFind);
                                  if(itemIdx<0){
                                      comboEditor->addItem(textToFind);
                                      itemIdx  = comboEditor->findText(textToFind);
                                      qDebug() << "addItem " << textToFind << " " << itemIdx << " " << m_comboProxy->rowCount() << " " << m_comboProxy->columnCount();
                                  }
                                  Q_ASSERT ( itemIdx >= 0 );
                                  comboEditor->setCurrentIndex(itemIdx);
                                  qDebug() << "in combo box " << comboEditor->currentText() << " " << itemIdx << " " << m_comboProxy->rowCount() << " " << m_comboProxy->columnCount();
                              }
                              }
                              
                              K Offline
                              K Offline
                              koahnig
                              wrote on last edited by
                              #17

                              @VRonin

                              I am sorry to correct, but it doesn't help either.

                              The problem is with the index coming into setEditorData

                              Here is my latest code:

                              void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
                              {
                                  if (index.data(Qt::EditRole).isNull())
                                      qobject_cast<QComboBox*>(editor)->setCurrentIndex(-1);
                                  else
                                  {
                                      auto comboEditor =qobject_cast<QComboBox*>(editor);
                                      Q_ASSERT(comboEditor);
                                      qDebug() << " index " << index;
                                      const QString& textToFind = index.data(Qt::EditRole).toString();
                                      qDebug() << "textToFind before reg exp " << textToFind;
                                      //make sure you are not just searching whitespace
                                      const QRegularExpression realTextRegExp("\\S+");
                                      if( ! realTextRegExp.match(textToFind).hasMatch()){
                                          qDebug() << "textToFind " << textToFind;
                                          comboEditor->setCurrentIndex(-1);
                                          return;
                                      }
                                      int itemIdx = comboEditor->findText(textToFind);
                                      if(itemIdx<0){
                                          comboEditor->addItem(textToFind);
                                          itemIdx  = comboEditor->findText(textToFind);
                                          qDebug() << "addItem " << textToFind << " " << itemIdx << " " << m_comboProxy->rowCount() << " " << m_comboProxy->columnCount();
                                      }
                                      Q_ASSERT ( itemIdx >= 0 );
                                      comboEditor->setCurrentIndex(itemIdx);
                                      qDebug() << "in combo box " << comboEditor->currentText() << " " << itemIdx << " " << m_comboProxy->rowCount() << " " << m_comboProxy->columnCount();
                                  }
                              }
                              

                              That is the latest output:

                              Starting r:\build-AnotherComboBoxTest-Desktop_Qt_5_9_1_MinGW_32bit-Debug\debug\AnotherComboBoxTest.exe...
                              no delegate found
                              addItem  "test 1 1"   E:\Source\AnotherComboBoxTest\MyTableWidget.cpp 28
                              addItem  "test 1 2"   E:\Source\AnotherComboBoxTest\MyTableWidget.cpp 28
                               index  QModelIndex(3,1,0x0,QTableModel(0x175fb6a8))
                              textToFind before reg exp  "testing"
                              in combo box  "testing"   1   2   1
                               index  QModelIndex(3,1,0x0,QTableModel(0x175fb6a8))
                              textToFind before reg exp  "testing"
                              in combo box  "testing"   1   2   1
                               index  QModelIndex(5,1,0x0,QTableModel(0x175fb6a8))
                              textToFind before reg exp  "erf"
                              in combo box  "erf"   0   3   1
                               index  QModelIndex(5,1,0x0,QTableModel(0x175fb6a8))
                              textToFind before reg exp  "erf"
                              in combo box  "erf"   0   3   1
                               index  QModelIndex(7,1,0x0,QTableModel(0x175fb6a8))
                              textToFind before reg exp  ""
                              textToFind  ""
                               index  QModelIndex(7,1,0x0,QTableModel(0x175fb6a8))
                              textToFind before reg exp  ""
                              textToFind  ""
                              

                              In additiion the update problems there are also the initial input for this test "test 1 1" not covered anymore after some input directly to the table.

                              Vote the answer(s) that helped you to solve your issue(s)

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                              • VRoninV Offline
                                VRoninV Offline
                                VRonin
                                wrote on last edited by
                                #18

                                Isn't that the correct output? what were you expecting?

                                "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                                ~Napoleon Bonaparte

                                On a crusade to banish setIndexWidget() from the holy land of Qt

                                K 1 Reply Last reply
                                0
                                • VRoninV VRonin

                                  Isn't that the correct output? what were you expecting?

                                  K Offline
                                  K Offline
                                  koahnig
                                  wrote on last edited by
                                  #19

                                  @VRonin

                                  Nope, I did the same as with the previous tests. Only lower case letters this time. The input was:

                                  • Double click on 4, 2
                                  • Typing "testing" <enter>
                                  • Double click on 6, 2
                                  • Typing "erf" <enter>
                                  • Double click 8, 2
                                  • Typing "zufall" <enter>

                                  Vote the answer(s) that helped you to solve your issue(s)

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                                  0
                                  • K Offline
                                    K Offline
                                    koahnig
                                    wrote on last edited by
                                    #20

                                    We are back to the start :(

                                    #define USE_COMBO_PROXY
                                    QWidget* ComboBoxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &, const QModelIndex &) const
                                    {
                                        QComboBox* result = new QComboBox(parent);
                                        result->setEditable( true );
                                        result->setInsertPolicy( QComboBox::InsertAlphabetically );
                                    
                                    #ifdef USE_COMBO_PROXY
                                    //    m_comboProxy->sort( 0 );
                                        result->setModel(m_comboProxy);
                                    #else
                                        result->setModel(m_comboModel);
                                    #endif
                                    
                                        return result;
                                    }
                                    

                                    Commenting out m_comboProxy->sort( 0 ) or by-passing the whole proxy model do work correctly.

                                    Vote the answer(s) that helped you to solve your issue(s)

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                                    • VRoninV Offline
                                      VRoninV Offline
                                      VRonin
                                      wrote on last edited by
                                      #21

                                      Sorry but now I'm lost. could you describe what the expected output was?

                                      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                                      ~Napoleon Bonaparte

                                      On a crusade to banish setIndexWidget() from the holy land of Qt

                                      1 Reply Last reply
                                      0
                                      • VRoninV Offline
                                        VRoninV Offline
                                        VRonin
                                        wrote on last edited by
                                        #22

                                        for anyone ending in this post from google, you should add m_comboProxy->setDynamicSortFilter(false); in the constructor of the delegate

                                        "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                                        ~Napoleon Bonaparte

                                        On a crusade to banish setIndexWidget() from the holy land of Qt

                                        K 1 Reply Last reply
                                        2
                                        • VRoninV VRonin

                                          for anyone ending in this post from google, you should add m_comboProxy->setDynamicSortFilter(false); in the constructor of the delegate

                                          K Offline
                                          K Offline
                                          koahnig
                                          wrote on last edited by
                                          #23

                                          @VRonin

                                          Yes, this does the trick.
                                          After introducing the line in the constructor the test example is working.

                                          Once again, many thanks for your help.

                                          Vote the answer(s) that helped you to solve your issue(s)

                                          1 Reply Last reply
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