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.