Display numbers in a model as strings in table view

[Dimis]

Hi all,

I'm new to Qt and I need your help in the task I'm trying to do.
I have a table model with numbers which is set and displayed in a table view.
Is there any way to display each number as a different string (word) depending on the number? I would like to keep the data stored in the model as numbers/integers.

If the information I gave is not sufficient please let me know, as I'm not sure I'm explaining my case well enough.

Thank you in advance.

[VRonin]

#ifndef WORDIFIER_H
#define WORDIFIER_H
#include <QStyledItemDelegate>
#include <QVariant>
class Wordifier : public QStyledItemDelegate{
Q_OBJECT
Q_DISABLE_COPY(Wordifier)
public:
Wordifier(QObject* parent = Q_NULLPTR) : QStyledItemDelegate(parent){}
QString displayText(const QVariant &value, const QLocale &locale) const Q_DECL_OVERRIDE{
if(value.canConvert(QMetaType::Int)){
switch(value.toInt()){
case 1: return QStringLiteral("One");
case 2: return QStringLiteral("Two");
case 3: return QStringLiteral("Three");
}
}
return QStyledItemDelegate::displayText(value,locale);
};
#endif

then in your call tableView->setItemDelegate(new Wordifier(this));

[Dimis]

Thank you VRonin for your reply.

As I mentioned I'm new to to Qt and C++. So my apologies if my question is silly.
The code you gave me should I input it in my header file and then create an instance of this class in my .cpp file? Also I guess I need to include the QStleItemDelegate class in the header file, isn't it?

[VRonin]

Correct, I also added the include guards and includes to the code above. Put everything in a header file, #include it in the .cpp where you are creating the table view and call that last line

[Dimis]

Many thanks again for this.
An error appears in the line " QString displayText(const QVariant &value, const QLocale &locale) const Q_DECL_OVERRIDE
" saying "expected {".
I tried to figure out where this is missing, but I couldn't. Any ideas?

EDIT:
I think I fixed it. I added a {} in the line before. Now no error appears.
I'll try to see what's happening and how this works and get back with any questions.

Many thanks again for your time.

[VRonin]

It's actually the line above the problem (i forgot {} in the constructor). Fixed now

[Dimis]

@VRonin the code seems to work, but probably I don't know how to use it.
I've added the last line in my code but nothin appears in the tableview.

Any ideas?

[VRonin]

@Dimis said in Display numbers in a model as strings in table view:

nothin appears in the tableview

You don't see anything anymore? If you remove the last line everything is displayed?

[Dimis]

@VRonin Sorry my bad, when I include the last line, these errors return:

mainwindow.obj:-1: error: LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl Wordifier::metaObject(void)const " (?metaObject@Wordifier@@UEBAPEBUQMetaObject@@XZ)

mainwindow.obj:-1: error: LNK2001: unresolved external symbol "public: virtual void * __cdecl Wordifier::qt_metacast(char const *)" (?qt_metacast@Wordifier@@UEAAPEAXPEBD@Z)

mainwindow.obj:-1: error: LNK2001: unresolved external symbol "public: virtual int __cdecl Wordifier::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@Wordifier@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)

debug\tool1_1.exe:-1: error: LNK1120: 3 unresolved externals

[VRonin]

re-run qmake

[Dimis]

@VRonin I did it and no error returns but nothing appears in the table view.
Maybe I'm missing something?

[VRonin]

I tested it on this minimal example and it works:

#include <QApplication>
#include <QTableView>
#include <QStandardItemModel>
#include <QStyledItemDelegate>
#include <QVariant>
class Wordifier : public QStyledItemDelegate{
    Q_DISABLE_COPY(Wordifier)
public:
    Wordifier(QObject* parent = Q_NULLPTR) : QStyledItemDelegate(parent){}
    QString displayText(const QVariant &value, const QLocale &locale) const Q_DECL_OVERRIDE{
        if(value.canConvert(QMetaType::Int)){
            switch(value.toInt()){
                case 1: return QStringLiteral("One");
                case 2: return QStringLiteral("Two");
                case 3: return QStringLiteral("Three");
                default: break;
            }
        }
        return QStyledItemDelegate::displayText(value,locale);
    }
};
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QStandardItemModel model;
    model.insertColumn(0);
    model.insertRows(0,3);
    model.setData(model.index(0,0),1);
    model.setData(model.index(1,0),2);
    model.setData(model.index(2,0),QStringLiteral("Test"));
    QTableView tableView;
    tableView.setItemDelegate(new Wordifier(&tableView));
    tableView.setModel(&model);
    tableView.show();
    return a.exec();
}

[Dimis]

@VRonin This works for me as well. I'll figure it out.
Many thanks again for your kind contribution and time.