How to Use Q_PROPERTY

[mitesh_modi]

Hi All,

I am a newbie to QT and using QT4.1.1 on Ubuntu-linux. i have to port C#'s class porperties in QT. so i think Q_PROPERTY might be useful. so any one let me know how to use Q_PROPERTY and it is great help if i can get sample example.

Thanks,
Mitesh.

[munna]

This should help you

[e8johan]

This could also help: http://qt4.digitalfanatics.org/tiqt/chapter-2.html .

[jacek]

And this.

[mitesh_modi]

Thanks All for quick reply.

I have a one more question how can i use this property from other class which derive this class.

like

class NumberHolder : public QObject
{
Q_OBJECT
Q_PROPERTY( int number READ number WRITE setNumber )

public:
NumberHolder( int value = 0 );
~NumberHolder();

int number() const;

void showNumber() const;

public slots:
void setNumber( int value );

private:
int m_value;
};

class DeriveClass : NumberHolder
{
private:
int der_no;
public:
void assignProp()
{
der_no=NumberHolder.number; //HOW CAN I USE PROPERTY?
}

};

Again Thanks for your help.

Mitesh

[jacek]

In this case you just have to use the proper method:

void assignProp()
{
   der_no = number();
}

void assignProp()
{
   der_no = number();
}

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[mitesh_modi]

Hi jacek,

Thanks for quick reply,

Thats right i can use method but then what is use of Q_PROPERTY? means i am missing some knowledge regarding Q_PROPERTY. I think that because of Q_PROPERTY macro one sholud not get the knowledge of class members and do get set of property defined in a class.

Can you briefly give what is the exact use of Q_PROPERTY.

Thanks,
Mitesh..

[jacek]

Can you briefly give what is the exact use of Q_PROPERTY.

You can use QObject::property() and QObject::setProperty() to change the value of given property without knowing anything about the object.

http://www.qtcentre.org/forum/f-newb...erty-1596.html