Dialog UI and heritage

[cfdev]

The best solution (iMHO) is to define access funtions in DialogInvoiceList
Like SetDate( QDate &) and use those from DialogPurchase

I'm agree with you, but I'm the only dev in this case and I want to access directly if possible, I tried to declare ui in protected but I have some error :)

D:\code\mcercle-trunk\src\dialog\dialogpurchase.cpp:17: error: invalid use of incomplete type 'class Ui::DialogInvoiceList' ui -> dateEdit -> setDate( QDate::currentDate());
and
D:\code\mcercle-trunk\src\dialog\dialoginvoicelist.h:10: error: forward declaration of 'class Ui::DialogInvoiceList' class DialogInvoiceList;

[mrjj]

the implementation of your function must be in the .cpp file.

so where you call ui -> dateEdit -> setDate( QDate::currentDate());
should be in a .cpp file and not .h

Is it in .cpp?

[cfdev]

@mrjj Yes, not in header file

[mrjj]

@cfdev
ok, so not that error.
Well, I have not tried to move it to protected.
I can try it a bit later and see :)

[Jakob]

@cfdev How did you embed Ui::DialogInvoiceList into your DialogInvoiceList? In your example the ui-class is nowhere!

Anyways, if you wanted to create a hierarchy of classes that derive from your ui-class, then the logical thing I'd do:

namespace Ui { class DialogInvoiceList; }

class DialogInvoiceList: protected DialogInvoiceList, public QDialog
{
    Q_OBJECT
public:
    explicit DialogInvoiceList(QWidget* parent) 
        : QDialog(parent)
    {
        setupUi(this);
    }
}

class DialogPurchase : protected DialogInvoiceList
{
    Q_OBJECT
public:
    explicit DialogPurchase(QWidget* parent)
        : DialogInvoiceList(parent)
    {}
}

I haven't tested, but I'm almost certain you can now access anything in the ui class directly, i.e. a member checkbox can be accessed directly in the DialogPurchase class.

[Jakob]

@cfdev To be more precize, you'd use the 'Multiple Inheritance' approach described here http://doc.qt.io/qt-5/designer-using-a-ui-file.html#the-multiple-inheritance-approach

[cfdev]

@Jakob If I use this code, I've some error 'inaccessible' :

D:\code\qt\4.8.7\src\gui\dialogs\qdialog.h:90: error: 'void QDialog::setModal(bool)' is inaccessible void setModal(bool modal);

D:\code\mcercle-trunk\src\mainwindow.cpp:323: error: 'QDialog' is not an accessible base of 'DialogPurchase'
...

PS: What is the markdown code to use the syntax color ?!

[cfdev]

It's ok like this:

namespace Ui { class DialogInvoiceList; }

class DialogInvoiceList: public QDialog, protected Ui::DialogInvoiceList
{
Q_OBJECT
public:
explicit DialogInvoiceList(QWidget* parent)
: QDialog(parent)
{
setupUi(this);
}
}

class DialogPurchase : public DialogInvoiceList
{
Q_OBJECT
public:
explicit DialogPurchase(QWidget* parent)
: DialogInvoiceList(parent)
{}
}

Many Thanks ;)

[Jakob]

@cfdev Aaahhh, of course, that actually rings some bells somewhere in the back of my head. I think I read somewhere that if you use multiple inheritance, the QObject-derived class must be the first in the list. This has something to do with the moc compiler I think.

You get the syntax highlighted using a single backtick for inline highlighting and backtick plus return for a code block.

[Jakob]

@cfdev Btw, please remember to mark as 'Solved' using the 'Topic Tools' at the bottom right corner of the topic thread.

[Jakob]

@cfdev Damn browser cache, never mind the remark as marking as 'Solved' - you already did .......

[SGaist]

Hi,

Just a side note, you have now a "Code" button with </> as an icon to help you write code blocks