Creating a Dialog in a Slot of QMainWindow

[tilm]

Hello,

I created a MainWindow and a very simple Dialog using the Qt Designer. I want to use both components with a single inheritance approach. In a Slot of the MainWindow (connected to an Action of the MainWindow) I want to create and execute an instance of the Dialog class. But when I try to compile the programm there is the error:

release\MainWindow.o(.text+0x28f):MainWindow.cpp: undefined reference to 'Dialog::Dialog(QWidget*)'

I think the proplem might be connected with the fact that I want to create the Dialog in a class derived from QMainWindow. In my project I previously created the Dialog in a Slot of a QAbstractTableModel and it worked fine. Than I decided that this class wasn't the right place to do this and wanted to create the Dialog in a slot of the MainWindow instead ending up with this error.

Here are the files of a minimal example:

MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include "ui_MainWindow.h"
 
class MainWindow : public QMainWindow {
	Q_OBJECT
 
public:	
	MainWindow(QWidget *parent=0,Qt::WFlags flags=0);
 
public slots:
	void createDialog();
 
private:
	Ui::MainWindow *ui;
};
 
#endif

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "ui_MainWindow.h"

class MainWindow : public QMainWindow {
	Q_OBJECT
	
public:	
	MainWindow(QWidget *parent=0,Qt::WFlags flags=0);
	
public slots:
	void createDialog();
	
private:
	Ui::MainWindow *ui;
};

#endif

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MainWindow.cpp

#include "MainWindow.h"
#include "Dialog.h"
 
MainWindow::MainWindow(QWidget *parent,Qt::WFlags flags){
	ui = new Ui::MainWindow;
	ui->setupUi(this);
 
	connect(ui->actionCreate,SIGNAL(activated()),this,SLOT(createDialog()));
}
 
void MainWindow::createDialog(){
	Dialog *d = new Dialog;
	d->exec();
}

#include "MainWindow.h"
#include "Dialog.h"

MainWindow::MainWindow(QWidget *parent,Qt::WFlags flags){
	ui = new Ui::MainWindow;
	ui->setupUi(this);
	
	connect(ui->actionCreate,SIGNAL(activated()),this,SLOT(createDialog()));
}

void MainWindow::createDialog(){
	Dialog *d = new Dialog;
	d->exec();
}

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Dialog.h

#ifndef MYDIALOG_H
#define MYDIALOG_H
 
#include <QDialog>
#include "ui_Dialog.h"
 
class Dialog : public QDialog {
public:
	Dialog(QWidget *parent = 0);
 
};
 
#endif

#ifndef MYDIALOG_H
#define MYDIALOG_H

#include <QDialog>
#include "ui_Dialog.h"

class Dialog : public QDialog {
public:
	Dialog(QWidget *parent = 0);
	
};

#endif

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Dialog.cpp

#include "Dialog.h"
 
Dialog::Dialog(QWidget *parent = 0) : QWidget(parent){
	Ui::Dialog *ui = new Ui::Dialog;
	ui.setupUi(this);
}

#include "Dialog.h"

Dialog::Dialog(QWidget *parent = 0) : QWidget(parent){
	Ui::Dialog *ui = new Ui::Dialog;
	ui.setupUi(this);
}

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