How to extend a class ?

[agent007se]

Hello !

It's my first post so please be patient .

I work on Code::Blocks and Qt 4.1.

I wonder how it is possible to extend, for exemple, a QListView ?

Here is what I tried without positive result :

QListViewExt.h :

// promoted widget QListView -> QListViewExt
#ifndef QLISTVIEWEXT_H
#define QLISTVIEWEXT_H
 
#include <qlistview.h>
 
 
class QListViewExt : public QListView
{
    Q_OBJECT
public:
    QListViewExt(QWidget *parent = 0, const char *name = 0);
    ~QListViewExt();
};
 
#endif

// promoted widget QListView -> QListViewExt
#ifndef QLISTVIEWEXT_H
#define QLISTVIEWEXT_H

#include <qlistview.h>


class QListViewExt : public QListView
{
    Q_OBJECT
public:
    QListViewExt(QWidget *parent = 0, const char *name = 0);
    ~QListViewExt();
};

#endif

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and the associated moc file where the problem is :

/****************************************************************************
** Meta object code from reading C++ file 'qlistviewext.h'
**
** Created: dim. 25. juin 10:56:43 2006
**      by: The Qt Meta Object Compiler version 59 (Qt 4.1.3)
**
** WARNING! All changes made in this file will be lost!
*****************************************************************************/
 
#include "qlistviewext.h"
#if !defined(Q_MOC_OUTPUT_REVISION)
#error "The header file 'qlistviewext.h' doesn't include <QObject>."
#elif Q_MOC_OUTPUT_REVISION != 59
#error "This file was generated using the moc from 4.1.3. It"
#error "cannot be used with the include files from this version of Qt."
#error "(The moc has changed too much.)"
#endif
 
// The problem is at this line
// The problem is at this line
static const uint qt_meta_data_QListViewExt[] = {
// error : 'uint' does not name a type
// error : 'uint' does not name a type
 
 // content:
       1,       // revision
       0,       // classname
       0,    0, // classinfo
       0,    0, // methods
       0,    0, // properties
       0,    0, // enums/sets
 
       0        // eod
};
 
static const char qt_meta_stringdata_QListViewExt[] = {
    "QListViewExt\0"
};
 
const QMetaObject QListViewExt::staticMetaObject = {
    { &QListView::staticMetaObject, qt_meta_stringdata_QListViewExt,
// The problem is at this line
// The problem is at this line
      qt_meta_data_QListViewExt, 0 }
// error :  : 'qt_meta_data_QListViewExt' was not declared in this scope
// error :  : 'qt_meta_data_QListViewExt' was not declared in this scope
};
 
const QMetaObject *QListViewExt::metaObject() const
{
    return &staticMetaObject;
}
 
void *QListViewExt::qt_metacast(const char *_clname)
{
    if (!_clname) return 0;
    if (!strcmp(_clname, qt_meta_stringdata_QListViewExt))
	return static_cast<void*>(const_cast<QListViewExt*>(this));
    return QListView::qt_metacast(_clname);
}
 
int QListViewExt::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
    _id = QListView::qt_metacall(_c, _id, _a);
    if (_id < 0)
        return _id;
    return _id;
}

/****************************************************************************
** Meta object code from reading C++ file 'qlistviewext.h'
**
** Created: dim. 25. juin 10:56:43 2006
**      by: The Qt Meta Object Compiler version 59 (Qt 4.1.3)
**
** WARNING! All changes made in this file will be lost!
*****************************************************************************/

#include "qlistviewext.h"
#if !defined(Q_MOC_OUTPUT_REVISION)
#error "The header file 'qlistviewext.h' doesn't include <QObject>."
#elif Q_MOC_OUTPUT_REVISION != 59
#error "This file was generated using the moc from 4.1.3. It"
#error "cannot be used with the include files from this version of Qt."
#error "(The moc has changed too much.)"
#endif

// The problem is at this line
// The problem is at this line
static const uint qt_meta_data_QListViewExt[] = {
// error : 'uint' does not name a type
// error : 'uint' does not name a type

 // content:
       1,       // revision
       0,       // classname
       0,    0, // classinfo
       0,    0, // methods
       0,    0, // properties
       0,    0, // enums/sets

       0        // eod
};

static const char qt_meta_stringdata_QListViewExt[] = {
    "QListViewExt\0"
};

const QMetaObject QListViewExt::staticMetaObject = {
    { &QListView::staticMetaObject, qt_meta_stringdata_QListViewExt,
// The problem is at this line
// The problem is at this line
      qt_meta_data_QListViewExt, 0 }
// error :  : 'qt_meta_data_QListViewExt' was not declared in this scope
// error :  : 'qt_meta_data_QListViewExt' was not declared in this scope
};

const QMetaObject *QListViewExt::metaObject() const
{
    return &staticMetaObject;
}

void *QListViewExt::qt_metacast(const char *_clname)
{
    if (!_clname) return 0;
    if (!strcmp(_clname, qt_meta_stringdata_QListViewExt))
	return static_cast<void*>(const_cast<QListViewExt*>(this));
    return QListView::qt_metacast(_clname);
}

int QListViewExt::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
    _id = QListView::qt_metacall(_c, _id, _a);
    if (_id < 0)
        return _id;
    return _id;
}

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(so there are two erros (in red comments))

If you need more information... just ask !

Thanks !

edit:
1) added semi-colon at and of class definition