[Qt-interest] inheritance problem

[Malyushytsky, Alex]

You derive from the class you need to derive from.

If I understood your problem (which I am not sure) you want  to use your derived class instead of QTabWidget.
In this case you might use "Promoting Widgets" technique.
http://doc.trolltech.com/4.6/designer-using-custom-widgets.html

In your case:

- You subclass from the QTabWidget
- in designer place QTabWidget and then promote it.

Hope this helps,
   Alex



-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of franki
Sent: Thursday, February 25, 2010 8:11 AM
To: qt-interest at trolltech.com
Subject: [Qt-interest] inheritance problem

Hi,

I've application with QMainWindow and tabWidget as a centralWidget,
class that maintains this tabWidget is called custPanel_TabWidget
some piece of custpanel.h:

#ifndef CUSTPANEL_H
#define CUSTPANEL_H
#include "ui_custpanel.h"

class custPanel_TabWidget: public QTabWidget
{
        Q_OBJECT
public:
        custPanel_TabWidget (QWidget *parent,QVariant cust_id,ItSql *itsql);
        ~custPanel_TabWidget();
        Ui::custPanel_TabWidget cp;
}

I wanted each tab to be maintained by its own class, because there is so many
functions that custPanel_TabWidget started to be huge mess.
so I did class e.g. Notify
header notify.h:

#ifndef NOTIFY_H
#define NOTIFY_H
#include <QObject>
#include "custpanel.h"

class custPanel_TabWidget;

class Notify: public custPanel_TabWidget
{
public:
        Notify ();
        ~Notify();
};

but during compilation, I get error:
invalid use of incomplete type 'struct custPanel_TabWidget'

I've googled somewhere that I should derive from Ui::custPanel_TabWidget
instead of custPanel_TabWidget, because this class is called that way in
ui_custpanel.h - which is true.
But, when I've tried to derive from Ui::custPanel_TabWidget, program compile
fine, but I can't access any widget on tabWidget, and in fact which class do
I derive from?

Second sollution for me, that I've proven to work earlier, was to pass some
variables to new class instead of deriving from custPanel_TabWindow, and
maintain all function related to this tab in that new class.
So in that case, the constructor is like this:

Abonament::Abonament(Ui::custPanel_TabWidget cp,ItSql *itsql,QVariant
cust_id,custPanel_TabWidget *parent) : QWidget ()

And this second approach works fine for me, but which one is better, or which
one is recommended?

Thanks in advance
Marek
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