making a class aware of the gui

[aegis]

hi,

i have a form design that i implement using the multiple inheritance approach, so i have a class {i name it gui} that represents my form

class gui : public QDialog, private Ui::mainFormGUI
 {
     Q_OBJECT
 
     //the constructor
     public:
     	gui (QWidget *parent = 0);
 
     //the buttons of the functions....
     private slots:
 
     private:
     typeA test;
};

class gui : public QDialog, private Ui::mainFormGUI
 {
     Q_OBJECT

     //the constructor
     public:
     	gui (QWidget *parent = 0);

     //the buttons of the functions....
     private slots:

     private:
     typeA test;
};

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the problem is that i want to make typeA access the gui interface....{for example write on a QTextEdit..... How can i do this?

i thought that i could pass to the typeA class a {this}pointer of gui {i.e. gui* p_gui} and then access the QTextEdit from p_gui but unfortunatelly it doesn't work....

any other ideas?

thanks in advance ,
N.A

[marcel]

Is the testA object in another thread. Because if it is, then you will need some synchronization.

To access a QTextEdit from the interface, you could add public wrapper functions in the gui class for the QTextEdit members that you need ( because the text edit is private in the gui, you cannot access it from the testA object ).

For example, for the setText method:

void gui::setText( QString text )
{

mTextEdit->setText( text );

}

Another solution would be to change the inheritance from the UI from private to public.

Hope this helps.

Marcel.

[Brandybuck]

If I understand your question correctly, then make typeA a friend of class gui.

[aegis]

thank you all for your answers
unfortunatelly nothing worked....

caseChangerClass.h

#ifndef caseChangerClass_H
#define caseChangerClass_H
 
#include "ui_caseChanger.h"
#include "classA.h"
 
#include <QDialog>
#include <QMenu>
 
 
//class caseChangerClass : public QDialog, private Ui::mainFormCaseChanger
 class caseChangerClass : public QDialog, private Ui::mainFormCaseChanger
 {
     Q_OBJECT
 
     //the constructor
     public:
     	caseChangerClass(QWidget *parent = 0);
 
 
     private:
     typeA test;
 
public: void caseChangerClass::setText( QString text );
 
};
 
#endif

#ifndef caseChangerClass_H
#define caseChangerClass_H

#include "ui_caseChanger.h"
#include "classA.h"

#include <QDialog>
#include <QMenu>


//class caseChangerClass : public QDialog, private Ui::mainFormCaseChanger
 class caseChangerClass : public QDialog, private Ui::mainFormCaseChanger
 {
     Q_OBJECT

     //the constructor
     public:
     	caseChangerClass(QWidget *parent = 0);


     private:
     typeA test;

public: void caseChangerClass::setText( QString text );

};

#endif

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caseChangerClass.cpp

#include "caseChangerClass.h"
 
#include <QtGui>
#include <QString>
 
caseChangerClass::caseChangerClass(QWidget* parent):QDialog(parent),test(this)
		{
 
			setupUi(this);
 
 
		}
 
void caseChangerClass::setText( QString text )
{
 
    textEdit->setText( text );
 
}

#include "caseChangerClass.h"

#include <QtGui>
#include <QString>

caseChangerClass::caseChangerClass(QWidget* parent):QDialog(parent),test(this)
		{

			setupUi(this);


		}

void caseChangerClass::setText( QString text )
{

    textEdit->setText( text );

}

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classA.h

#ifndef classA_H
#define classA_H
 
#include "caseChangerClass.h"
 
class caseChangerClass;
 
 class  typeA
 {
 
 
     //the constructor
     public:
     	typeA(caseChangerClass* gui);
     	~typeA();
 
     caseChangerClass* m_gui;
 
};
 
#endif

#ifndef classA_H
#define classA_H

#include "caseChangerClass.h"

class caseChangerClass;

 class  typeA
 {


     //the constructor
     public:
     	typeA(caseChangerClass* gui);
     	~typeA();

     caseChangerClass* m_gui;

};

#endif

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classA.cpp

#include "classA.h"
 
typeA::typeA(caseChangerClass* gui);
{
 
m_gui = gui;
 
//this is what i tryied to do earlier....
//m_gui->textEdit->append("hi!");
 
gui->setText( "HI" );
 
}

#include "classA.h"

typeA::typeA(caseChangerClass* gui);
{

m_gui = gui;

//this is what i tryied to do earlier....
//m_gui->textEdit->append("hi!");

gui->setText( "HI" );

}

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main.cpp

#include <QApplication>
 
#include "caseChangerClass.h"
 
int main(int argc, char *argv[])
{
     QApplication app(argc, argv);
     caseChangerClass myApp;
     myApp.setWindowFlags(Qt::WindowStaysOnTopHint);
     myApp.show();
     return app.exec();
}

#include <QApplication>

#include "caseChangerClass.h"

int main(int argc, char *argv[])
{
     QApplication app(argc, argv);
     caseChangerClass myApp;
     myApp.setWindowFlags(Qt::WindowStaysOnTopHint);
     myApp.show();
     return app.exec();
}

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ui_caseChanger.h

/********************************************************************************
** Form generated from reading ui file 'caseChanger.ui'
**
** Created: Mon 2. Apr 20:23:18 2007
**      by: Qt User Interface Compiler version 4.2.2
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/
 
#ifndef UI_CASECHANGER_H
#define UI_CASECHANGER_H
 
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QTextEdit>
#include <QtGui/QWidget>
 
class Ui_mainFormCaseChanger
{
public:
    QTextEdit *textEdit;
 
    void setupUi(QWidget *mainFormCaseChanger)
    {
    mainFormCaseChanger->setObjectName(QString::fromUtf8("mainFormCaseChanger"));
    textEdit = new QTextEdit(mainFormCaseChanger);
    textEdit->setObjectName(QString::fromUtf8("textEdit"));
    textEdit->setGeometry(QRect(80, 20, 251, 171));
 
    retranslateUi(mainFormCaseChanger);
 
    QSize size(444, 207);
    size = size.expandedTo(mainFormCaseChanger->minimumSizeHint());
    mainFormCaseChanger->resize(size);
 
 
    QMetaObject::connectSlotsByName(mainFormCaseChanger);
    } // setupUi
 
    void retranslateUi(QWidget *mainFormCaseChanger)
    {
    mainFormCaseChanger->setWindowTitle(QApplication::translate("mainFormCaseChanger", "test", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(mainFormCaseChanger);
    } // retranslateUi
 
};
 
namespace Ui {
    class mainFormCaseChanger: public Ui_mainFormCaseChanger {};
} // namespace Ui
 
#endif // UI_CASECHANGER_H

/********************************************************************************
** Form generated from reading ui file 'caseChanger.ui'
**
** Created: Mon 2. Apr 20:23:18 2007
**      by: Qt User Interface Compiler version 4.2.2
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/

#ifndef UI_CASECHANGER_H
#define UI_CASECHANGER_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QTextEdit>
#include <QtGui/QWidget>

class Ui_mainFormCaseChanger
{
public:
    QTextEdit *textEdit;

    void setupUi(QWidget *mainFormCaseChanger)
    {
    mainFormCaseChanger->setObjectName(QString::fromUtf8("mainFormCaseChanger"));
    textEdit = new QTextEdit(mainFormCaseChanger);
    textEdit->setObjectName(QString::fromUtf8("textEdit"));
    textEdit->setGeometry(QRect(80, 20, 251, 171));

    retranslateUi(mainFormCaseChanger);

    QSize size(444, 207);
    size = size.expandedTo(mainFormCaseChanger->minimumSizeHint());
    mainFormCaseChanger->resize(size);


    QMetaObject::connectSlotsByName(mainFormCaseChanger);
    } // setupUi

    void retranslateUi(QWidget *mainFormCaseChanger)
    {
    mainFormCaseChanger->setWindowTitle(QApplication::translate("mainFormCaseChanger", "test", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(mainFormCaseChanger);
    } // retranslateUi

};

namespace Ui {
    class mainFormCaseChanger: public Ui_mainFormCaseChanger {};
} // namespace Ui

#endif // UI_CASECHANGER_H

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why this doesn't work??

[marcel]

I noticed typeA* test, in classChangerClass, is initialized in the constructor list. This cannot be a good thing because setupUi is called after you set the text in the text edit, in the constructor of typeA.

Try constructing "test" after setupUi.

Marcel

[aegis]

unfortunatelly i cant setup test after because c++ will try to initialize it implicitly with a default constructor...and since i dont have a default constructor i will get an error message....

any other ideas??

[marcel]

Don't call setText in the constructor of testA!
Make another method that calls setText, which will be called after setupUI. It's not really that hard to make this work.

[aegis]

Don't call setText in the constructor of testA!
Make another method that calls setText, which will be called after setupUI. It's not really that hard to make this work.

i didn't understand correctly what you said, but i do now and i get the same error that typeA does not name a type...

[aegis]

if in classA.h i remove the line4 {#include "caseChangerClass.h"}
then it proceeds with compilation and i get this error:

classA.cpp:9: error: invalid use of undefined type `struct caseChangerClass'

any ideas...?

[Brandybuck]

caseChangerClass has a typeA member, but the typeA class takes a caseChangerClass in the constructor. Though it is permitted in C++, it is a sign of a bad design.

[aegis]

caseChangerClass has a typeA member, but the typeA class takes a caseChangerClass in the constructor. Though it is permitted in C++, it is a sign of a bad design.

yes but i cant find any other way to make typeA now about the gui.....in particular about the textEdit field of the gui...