Width QTableView for QCombobox with multiple columns

[spirit]

I´m joing to your thread, but I need a how to get a QComboBox with multple columns like VBasic does.

what do you mean? do you mean that a combobox displays in a popup a table with many columns?

[ness]

Hello,

I've just had the same problem, here's my solution :

QTableView* coilView = new QTableView(this);                        //create the tableview
            ui->coilComboBox->setView(coilView);                                //set it to the comboBox before making changes
            coilView->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);      //fine tuning of some options
            coilView->setSelectionMode(QAbstractItemView::SingleSelection);
            coilView->setSelectionBehavior(QAbstractItemView::SelectRows);
            coilView->setAutoScroll(false);
            ui->coilComboBox->setModel(model);                                  //set the model
            coilView->resizeColumnsToContents();                                //resise to content after setting model (needs data)
            coilView->resizeRowsToContents();
            coilView->setMinimumWidth(coilView->horizontalHeader()->length());  //to have a good width on the drop down widget

QTableView* coilView = new QTableView(this);                        //create the tableview
            ui->coilComboBox->setView(coilView);                                //set it to the comboBox before making changes
            coilView->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);      //fine tuning of some options
            coilView->setSelectionMode(QAbstractItemView::SingleSelection);
            coilView->setSelectionBehavior(QAbstractItemView::SelectRows);
            coilView->setAutoScroll(false);
            ui->coilComboBox->setModel(model);                                  //set the model
            coilView->resizeColumnsToContents();                                //resise to content after setting model (needs data)
            coilView->resizeRowsToContents();
            coilView->setMinimumWidth(coilView->horizontalHeader()->length());  //to have a good width on the drop down widget

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Hope it helps

[bascuppen]

From Qt Assistant:

void QComboBox::setView ( QAbstractItemView * itemView ):
Sets the view to be used in the combobox popup to the given itemView. The combobox takes ownership of the view.
Note: If you want to use the convenience views (like QListWidget, QTableWidget or QTreeWidget), make sure to call setModel() on the combobox with the convenience widgets model before calling this function.

Example: (written in Python)

box = QtGui.QComboBox()
        box.setObjectName('somename')
 
        view = QtGui.QTableView()
        model = QtSql.QSqlQueryModel()
        model.setQuery('select something as somename, somethingother from somewhere')
        view.setModel(model)
 
        #Do with the view whatever you like
        view.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
        view.setSelectionMode(QAbstractItemView.SingleSelection)
        view.setSelectionBehavior(QAbstractItemView.SelectRows)
        view.setAutoScroll(False)
        view.resizeColumnsToContents()
        view.resizeRowsToContents()
        #view.setSortingEnabled(True)
        view.verticalHeader().setVisible(False) #Rownumbers 
        view.setMinimumWidth(view.horizontalHeader().length())
 
        #The important part: First set the model, then the view on the box
        box.setModel(model)
        box.setView(view)

box = QtGui.QComboBox()
        box.setObjectName('somename')
        
        view = QtGui.QTableView()
        model = QtSql.QSqlQueryModel()
        model.setQuery('select something as somename, somethingother from somewhere')
        view.setModel(model)

        #Do with the view whatever you like
        view.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
        view.setSelectionMode(QAbstractItemView.SingleSelection)
        view.setSelectionBehavior(QAbstractItemView.SelectRows)
        view.setAutoScroll(False)
        view.resizeColumnsToContents()
        view.resizeRowsToContents()
        #view.setSortingEnabled(True)
        view.verticalHeader().setVisible(False) #Rownumbers 
        view.setMinimumWidth(view.horizontalHeader().length())

        #The important part: First set the model, then the view on the box
        box.setModel(model)
        box.setView(view)

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As with every solution, it comes with new problems. In the previous example, it is possible to set the QComboBox with any value from the QTable. Or, in other words, if you click the first value from the first row the QComboBox will show a different value as when you would click the second value from the first row.

I'm open to suggestions as how to solve that problem.