[solved] How to make cell in the Table View a QCombobox when an user edits ?

Ratzz

I am using QFileSystemModel to set model and view it using Qtableview.
When any user edits the cell of the table i want the cell to be editable and make that particular cell as combobox .

Sam

Hi,

You can use a QStyledItemDelegate to your tableView. You can also have a look at this WIKI documentation that uses a combobox delegate.

Ratzz

This post is deleted!

Ratzz

@Sam
My code looks like this
Mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QTableView>
#include <QWidget>
#include <QApplication>
#include <QFileSystemModel>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
    
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    
private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

main.cpp

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    return a.exec();
}

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QFileSystemModel *model = new QFileSystemModel;//creating model
     model->setRootPath(QDir::currentPath());

    QTableView *view = new QTableView; //creating view
     view->setModel(model);
     view->show();//viewing
}

MainWindow::~MainWindow()
{
    delete ui;
}

How to use QStyledItemDelegate on the above code?

Sam

@Ratzz

You need to create a separate class as shown in the WIKI document link , Then create an instance and set it to your tableView.

e,g

ComboBoxDelegate *comboDelegate = new ComboBoxDelegate(this);
m_tableView->setItemDelegateForColumn(col,comboDelegate );

Ratzz

@Sam
Thanks for the reply .
I am newbie to QT i did not understand how to create an instance and set it to your tableView.
I am now trying with QItemDelegate now.
Can you just tell which part of the code need to be edited ?

Ratzz

@Sam
I tried with QStandardItemModel . But i want tableview be the combobox when edited.

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QStandardItemModel *model = new QStandardItemModel(4,2,this);
    ui->tableView->setModel(model);
     for(int row = 0; row < 4; row++)
             {
                 for(int col = 0; col < 2; col++)
                 {
                     QModelIndex index= model->index(row,col,QModelIndex());

                     // 0 for all data
                     model->setData(index, 0) ;
                 }
             }

     QComboBox *combo = new QComboBox(this);
     combo->setModel(model);
}

SGaist

Hi

e,g

ComboBoxDelegate *comboDelegate = new ComboBoxDelegate(this);
m_tableView->setItemDelegateForColumn(col,comboDelegate );

@Sam gave you the example there ^^^^

Ratzz

@sam @SGaist
I have created a separate class ComboBoxDelegate which contains same code as the above wiki document .
where to create an instance and set it to tableView ? in main.cpp or in mainwindow.cpp? or in comboboxitemdelegate.cpp

Sam

The place where you can access the instance of tableView or where you instantiate your tableView. So in this case it should be in the constructor of MainWindow

view->setItemDelegateForColumn(col,comboDelegate );

Ratzz

@sam
Thanks it works :)

Ratzz

@Sam
I have 2 column and 4 rows if i set

view->setItemDelegateForColumn(1,comboDelegate );

Entire column "1 " will be a combobox .

If i set

view->setItemDelegateForRow(1,comboDelegate );

only row 1 corresponding to first column will be combobox (one cell only )
What if i want only one row to be a combobox?

Ratzz

@Sam now its working fine :)

Is there any option to make particular cell a combobox ?(not entire row or column )

Sam

So you mean to say you want to display the combobox only for one specific cell, In this case you can also try with setIndexWidget() which will display a combobox for a particular modelIndex.

Ratzz

@Sam
Thanks you :)
Why can't i set using? can't we do it for tableview? is it only for widgets?

 tableView->setIndexWidget(index,comboDelegate);

'QAbstractItemView::setIndexWidget' : cannot convert parameter 2 from 'ComboBoxDelegate *' to 'QWidget *' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

This works fine

 tableView->setIndexWidget(index,new QLineEdit);