Adding own UI to dialog

[aney]

Hey,

I'm a very beginner to Qt. That's my question:

I created a main window with a button. When I click on the button a new widget appears, but I want to have a dialog. So how do I add an ownmade .ui-file to the
dialog-class? When I try it the way I did it for the main window I get errors.

Also I would be happy if you could have a look if I can code something easier or in a better way.

Thanks a lot for your help!

main.cpp

#include "mondev.h"
#include <QtWidgets/QApplication>
#include <qt_windows.h>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MonDev window;
	window.setWindowFlags(Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint);				
	window.show();																			
	return a.exec();
}

mondev.cpp

#include "mondev.h"
#include "ui_mondev.h"
#include <QtWidgets>
#include "DialogDreh.h"

MonDev::MonDev(QWidget *parent)
	: QMainWindow(parent),
	ui(new Ui::MonDevClass)
{
	ui->setupUi(this);
}

MonDev::~MonDev()
{
}

void MonDev::on_menuDreh_clicked()
{
	dialogdreh = new DialogDreh(this);
	dialogdreh->show();
}

mondev.h

#ifndef MONDEV_H
#define MONDEV_H

#include <QtWidgets/QMainWindow>
#include "ui_mondev.h"
#include "DialogDreh.h"

namespace Ui {
	class MonDev;
}

class MonDev : public QMainWindow
{
	Q_OBJECT

	public:
		MonDev(QWidget *parent = 0);
		~MonDev();

	private slots:
		void on_menuDreh_clicked();

	private:
		Ui::MonDevClass *ui;
		DialogDreh *dialogdreh;
};
#endif // MONDEV_H

DialogDreh.cpp

#include <QtWidgets>
#include "DialogDreh.h"
#include "ui_DialogDreh.h"
#include <qdialog.h>
#include <qmainwindow.h>

DialogDreh::DialogDreh(QWidget *parent) 
	: QDialog(parent)
{
}

DialogDreh::~DialogDreh()
{
}

DialogDreh.h

#ifndef DIALOGDREH_H
#define DIALOGDREH_H

#include <qdialog.h>
#include "ui_DialogDreh.h"
#include <qmainwindow.h>

namespace Ui {
	class DialogDreh;
}

class DialogDreh : public QDialog
{
	Q_OBJECT

	public:
		DialogDreh(QWidget *parent=0);
		~DialogDreh();
};

#endif //DIALOGDREH_H

[mrjj]

hi , you would create new dialog via
New ->Qt->Form designer Class->Dialog Without buttons
then it should have a blank UI file just like mainwindow and you can just add
widgets to it.

It seems you almost did that but constructor for you dialog should be like this
Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
}

to use the UI file
ui(new Ui::Dialog) and ui->setupUi(this);
so please try via the new menu

[aney]

@mrjj

Hi mrjj,

thanks a lot for your answer!
so I created a new Widget and without the ui(new UI::DialogDreh) and ui->setupUI(this); part everythings ok. When I push the button the window appears.

But with this part I get an error references to the ui (error C2512: no appropriate default constructor available; and some more).

What could that be?

[mrjj]

@aney
Hi, if you create a new dialog via the New menu, it all should be ok. ?

that error "no appropriate default constructor available;"
normally means you create the object with

A * = new A();

but A dont have a constructor that takes zero parameters
A constructor might be
a(Widget *Parent)
and wants to be constructed
A * = new A(this);

Bot if you copy & paste the error and the line it talks about , it will be easier to guess.

[aney]

@mrjj

the lines 8 - 13:

DialogDreh::DialogDreh(QWidget *parent)
	: QDialog(parent),
	ui(new Ui::DialogDreh)
	{
		ui->setupUi(this);
	}

the errors:

1>dialogdreh.cpp(10): error C2512: 'Ui::DialogDreh': no appropriate default constructor available
1>dialogdreh.cpp(11): error C2614: 'DialogDreh': illegal member initialization: 'ui' is not a base or member
1>dialogdreh.cpp(12): error C2065: 'ui': undeclared identifier
1>dialogdreh.cpp(12): error C2227: left of '->setupUi' must point to class/struct/union

thanks again!

[mrjj]

@aney said:
Hi it seems you just added the lines to your existing dialog ?
Like the " ui->setupUi(this);"
you should create DialogDreh via the New ->Qt->Form designer Class->Dialog Without buttons
so all the needed files are created.
It seems no UI files has been generated.
So I guessing you just added the lines ?
Or?

[aney]

@mrjj
My active window in Qt Designer was my main window (mondev), there I made a new Dialog without Buttons, a new window/file opened, I added a label and saved it in the mondev-folder.

I'm coding in Visual Studio, so then I had to add the new dialogdreh.ui to my project manually. Also I had to create dialogdreh.cpp and dialogdreh.h manually.
Is there any way it creates them automatically in my project?

[mrjj]

@aney
Ah, if you use Visual Studio, then you must make
sure that moc.exe is also run as it creates
the needed ui_ file with c++ code.

Do you use the qt plugin for Visual Studio ?

--create dialogdreh.cpp and dialogdreh.h manually.
that sounds a bit wrong as the wizard normally create the files for you.

Are you using Express version of studio ?

could u try this test project.
its default mainwindow that open dialog when u press button.
https://www.dropbox.com/s/svg1skt3ikvj0r1/defaultwithdialog.zip?dl=0

If it dont work, I guess your are not properly setup to use UI files.

[aney]

@mrjj

Ok, I tried the same code in QtCreator and it worked :D
So maybe I just use QtCreator for the beginning... seems to be easier!

I used Visual Studio Professional with the Add-In. And yes, know I see under Debug -> moc_mondev.cpp etc. there's a red-minus-sign :/
I think I have insufficient knowledge about Qt + VS, maybe just start with QtCreator+Designer :D

But thanks so much for your help!

[mrjj]

@aney
Hi, seems something up with the setup. Normally the Add-In does all the work but
if using QCreator is fine then its a good solution. :)
Its a nice editor with many hidden gems.

[aney]

@mrjj
Yes, I think I will have a look later, maybe install the Add-In again. But I'm glad, that it wasn't the code - I already doubted me :D
Another question: where can I tag this topic as solved?

[mrjj]

@aney
Yeah when meta compiler doesn't run, it all get a bit strange. :)

In first post , under it. to the right. is Topic Tools button. It can mark as solved.