Q_OBJECT, vtables and basic GUI control.

[ChrisW67]

If you want to replace the entire central widget of the QMainWindow with your tab widget then just call QMainWindow::setCentralWidget() (the existing central widget will be destroyed). If you intend to switch back and forth between several different central widgets then you should look at QStackedWidget.

If that is not what you want than you should post a small compilable example that shows what you are doing and then explain what you want it to do.

[Diath]

Well, I'm using QDialog, not QMainWindow, but yeah, it'll be easier to explain on code, here is it:

main.cpp:

#include <QApplication>
#include "LoginInterface.h"
 
int main(int argc, char *argv[])
{
        QApplication app(argc, argv);
 
        LoginInterface li;
        li.show();
 
        return app.exec();
}

#include <QApplication>
#include "LoginInterface.h"

int main(int argc, char *argv[])
{
        QApplication app(argc, argv);

        LoginInterface li;
        li.show();

        return app.exec();
}

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LoginInterface.cpp:

#include "LoginInterface.h"
 
LoginInterface::LoginInterface(QWidget *parent, Qt::WindowFlags flags) :
    QDialog(parent, flags)
{
	MainLayout = new QGridLayout;
 
	// GUI Controls
	UserLabel = new QLabel(tr("User:"));
	UserInput = new QLineEdit;
 
	PasswordLabel = new QLabel(tr("Password:"));
	PasswordInput = new QLineEdit;
 
	LoginButton = new QPushButton(tr("Login"));
	ExitButton = new QPushButton(tr("Exit"));
 
	connect(LoginButton, SIGNAL(clicked()), this, SLOT(Login()));
	connect(ExitButton, SIGNAL(clicked()), this, SLOT(Exit()));
 
	// Adding Widgets
	MainLayout->addWidget(UserLabel);
	MainLayout->addWidget(UserInput);
 
	MainLayout->addWidget(PasswordLabel);
	MainLayout->addWidget(PasswordInput);
 
	MainLayout->addWidget(LoginButton);
	MainLayout->addWidget(ExitButton);
 
	// Display
	setLayout(MainLayout);
	setWindowTitle("Login");
}
 
void LoginInterface::Run()
{
	// Totalny rozpierdol!
	delete UserLabel;
	delete UserInput;
 
	delete PasswordLabel;
	delete PasswordInput;
 
	delete LoginButton;
	delete ExitButton;
 
	// Title
	data[1].clear();
	data[1] = "Logged as " + data[0];
	setWindowTitle(data[1]);
	data[1].clear();
 
	// Basic Tab
	BasicWidget = new QWidget;
	BasicLayout = new QGridLayout;
 
	// // Basic Tab - Kontrolki
	UsernameLabel = new QLabel("User:");
	UsernameEdit = new QLineEdit(data[0]);
	UsernameEdit->setReadOnly(true);
	data[0].clear();
 
	// // Basic Tab - Dodawanie Widgetow
	BasicLayout->addWidget(UsernameLabel);
	BasicLayout->addWidget(UsernameEdit);
 
	// // Basic Tab - Ustawianie Layoutu
	BasicWidget->setLayout(BasicLayout);
 
	// Tabs
	Tabs = new QTabWidget;
	Tabs->addTab(BasicWidget, tr("Basic Info"));
	MainLayout->addWidget(Tabs);
}
 
void LoginInterface::Login()
{
	data[0] = UserInput->text();
	data[1] = PasswordInput->text();
 
	QMessageBox *Box = new QMessageBox;
	Box->setWindowTitle("Login");
 
	if(data[0] != "Diath" && data[1] != "test") // have to see QMySQLDriver later
	{
		Box->setText("You did enter wrong login data.");
		Box->setIcon(QMessageBox::Critical);
		Box->setStandardButtons(QMessageBox::Ok);
	}
	else
	{
		Box->setText("Welcome!");
		Box->setIcon(QMessageBox::Information);
		Box->setStandardButtons(QMessageBox::Ok);
 
		Run();
	}
 
	Box->exec();
}
 
void LoginInterface::Exit()
{
	exit(0);
}

#include "LoginInterface.h"

LoginInterface::LoginInterface(QWidget *parent, Qt::WindowFlags flags) :
    QDialog(parent, flags)
{
	MainLayout = new QGridLayout;

	// GUI Controls
	UserLabel = new QLabel(tr("User:"));
	UserInput = new QLineEdit;

	PasswordLabel = new QLabel(tr("Password:"));
	PasswordInput = new QLineEdit;

	LoginButton = new QPushButton(tr("Login"));
	ExitButton = new QPushButton(tr("Exit"));

	connect(LoginButton, SIGNAL(clicked()), this, SLOT(Login()));
	connect(ExitButton, SIGNAL(clicked()), this, SLOT(Exit()));

	// Adding Widgets
	MainLayout->addWidget(UserLabel);
	MainLayout->addWidget(UserInput);

	MainLayout->addWidget(PasswordLabel);
	MainLayout->addWidget(PasswordInput);

	MainLayout->addWidget(LoginButton);
	MainLayout->addWidget(ExitButton);

	// Display
	setLayout(MainLayout);
	setWindowTitle("Login");
}

void LoginInterface::Run()
{
	// Totalny rozpierdol!
	delete UserLabel;
	delete UserInput;

	delete PasswordLabel;
	delete PasswordInput;

	delete LoginButton;
	delete ExitButton;

	// Title
	data[1].clear();
	data[1] = "Logged as " + data[0];
	setWindowTitle(data[1]);
	data[1].clear();

	// Basic Tab
	BasicWidget = new QWidget;
	BasicLayout = new QGridLayout;

	// // Basic Tab - Kontrolki
	UsernameLabel = new QLabel("User:");
	UsernameEdit = new QLineEdit(data[0]);
	UsernameEdit->setReadOnly(true);
	data[0].clear();

	// // Basic Tab - Dodawanie Widgetow
	BasicLayout->addWidget(UsernameLabel);
	BasicLayout->addWidget(UsernameEdit);

	// // Basic Tab - Ustawianie Layoutu
	BasicWidget->setLayout(BasicLayout);

	// Tabs
	Tabs = new QTabWidget;
	Tabs->addTab(BasicWidget, tr("Basic Info"));
	MainLayout->addWidget(Tabs);
}

void LoginInterface::Login()
{
	data[0] = UserInput->text();
	data[1] = PasswordInput->text();

	QMessageBox *Box = new QMessageBox;
	Box->setWindowTitle("Login");

	if(data[0] != "Diath" && data[1] != "test") // have to see QMySQLDriver later
	{
		Box->setText("You did enter wrong login data.");
		Box->setIcon(QMessageBox::Critical);
		Box->setStandardButtons(QMessageBox::Ok);
	}
	else
	{
		Box->setText("Welcome!");
		Box->setIcon(QMessageBox::Information);
		Box->setStandardButtons(QMessageBox::Ok);

		Run();
	}

	Box->exec();
}

void LoginInterface::Exit()
{
	exit(0);
}

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LoginInterface.h:

#ifndef LOGININTERFACE_H
#define LOGININTERFACE_H
 
#include <QtGui>
#include <QDialog>
 
class LoginInterface : public QDialog
{
	Q_OBJECT
	public:
		LoginInterface(QWidget *parent = 0, Qt::WindowFlags flags = 0);
	public slots:
		void Login();
		void Exit();
	private:
		void Run();
		QString data[2];
 
		// Main Layout and its controls.
		QGridLayout *MainLayout;
		QLabel *UserLabel, *PasswordLabel;
		QLineEdit *UserInput, *PasswordInput;
		QPushButton *LoginButton, *ExitButton;
 
		// Client Layouts and their controls.
		QGridLayout *BasicLayout;
		QWidget *BasicWidget;
		QTabWidget *Tabs;
 
		// Basic Tab
		QLabel *UsernameLabel;
		QLineEdit *UsernameEdit;
};
 
#endif // LOGININTERFACE_H

#ifndef LOGININTERFACE_H
#define LOGININTERFACE_H

#include <QtGui>
#include <QDialog>

class LoginInterface : public QDialog
{
	Q_OBJECT
	public:
		LoginInterface(QWidget *parent = 0, Qt::WindowFlags flags = 0);
	public slots:
		void Login();
		void Exit();
	private:
		void Run();
		QString data[2];

		// Main Layout and its controls.
		QGridLayout *MainLayout;
		QLabel *UserLabel, *PasswordLabel;
		QLineEdit *UserInput, *PasswordInput;
		QPushButton *LoginButton, *ExitButton;

		// Client Layouts and their controls.
		QGridLayout *BasicLayout;
		QWidget *BasicWidget;
		QTabWidget *Tabs;

		// Basic Tab
		QLabel *UsernameLabel;
		QLineEdit *UsernameEdit;
};

#endif // LOGININTERFACE_H

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Now, I want to delete MainLayout while deleting old controls like UserInput, and then I have to replace this one:

MainLayout->addWidget(Tabs);

MainLayout->addWidget(Tabs);

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With something that will set Tabs widget as parent windows "central widget", also I have to access somehow to parent window and set its size.

[Diath]

B.u.m.p.

[ChrisW67]

Your approach at the moment makes more work than you need. To apply a new layout in place of the old you need to delete the existing layout (see QWidget::setLayout() docs) and then apply the new one. That does not remove the original widgets (they are children of the QDialog not the layout) which you would then have to hide or delete yourself. See http://www.qtcentre.org/threads/3295...932#post152932

I would use QStackedWidget. In the constructor set up your login user name and password layout on one page and the running stuff on the other and set the login page to be current. Then when they successfully log in switch the stacked layout current page. If there is a log out function then that just switches the pages back.

[Diath]

Thanks for your advice, now I have such code so far:

#include "LoginInterface.h"
 
LoginInterface::LoginInterface(QWidget *parent, Qt::WindowFlags flags) :
    QDialog(parent, flags)
{
	// Main
	MainLayout = new QGridLayout;
 
	// GUI Controls
	UserLabel = new QLabel(tr("User:"));
	UserInput = new QLineEdit;
 
	PasswordLabel = new QLabel(tr("Password:"));
	PasswordInput = new QLineEdit;
	PasswordInput->setEchoMode(QLineEdit::Password);
 
	LoginButton = new QPushButton(tr("Login"));
	ExitButton = new QPushButton(tr("Exit"));
 
	connect(LoginButton, SIGNAL(clicked()), this, SLOT(Login()));
	connect(ExitButton, SIGNAL(clicked()), this, SLOT(Exit()));
 
	// Adding Widgets
	MainLayout->addWidget(UserLabel);
	MainLayout->addWidget(UserInput);
 
	MainLayout->addWidget(PasswordLabel);
	MainLayout->addWidget(PasswordInput);
 
	MainLayout->addWidget(LoginButton);
	MainLayout->addWidget(ExitButton);
 
	// Client
	ClientLayout = new QGridLayout;
	// Basic Tab
	BasicWidget = new QWidget;
	BasicLayout = new QGridLayout;
 
	// // Basic Tab - Kontrolki
	UsernameLabel = new QLabel("User:");
	UsernameEdit = new QLineEdit();
	UsernameEdit->setReadOnly(true);
 
	// // Basic Tab - Dodawanie Widgetow
	BasicLayout->addWidget(UsernameLabel);
	BasicLayout->addWidget(UsernameEdit);
 
	// // Basic Tab - Ustawianie Layoutu
	BasicWidget->setLayout(BasicLayout);
 
	// Tabs
	Tabs = new QTabWidget;
 
	Tabs->addTab(BasicWidget, tr("Basic Info"));
 
	// misc.
	ClientLayout->addWidget(Tabs);
 
	setLayout(MainLayout);
	setWindowTitle("Login");
}
 
void LoginInterface::Run()
{
	delete UserInput;
	delete UserLabel;
	delete PasswordInput;
	delete PasswordLabel;
	delete LoginButton;
	delete ExitButton;
	delete MainLayout;
	// Title
	data[1].clear();
	data[1] = "Logged as " + data[0];
	QWidget::setWindowTitle(data[1]);
	data[1].clear();
 
	UsernameEdit->insert(data[0]);
	data[0].clear();
 
	// Layout
	QWidget::setFixedWidth(250);
	QWidget::setLayout(ClientLayout);
}
 
void LoginInterface::Login()
{
	data[0] = UserInput->text();
	data[1] = PasswordInput->text();
 
	QMessageBox *Box = new QMessageBox;
	Box->setWindowTitle("Login");
 
	if(data[0] != "Diath" && data[1] != "test")
	{
		Box->setText("You did enter wrong login data.");
		Box->setIcon(QMessageBox::Critical);
		Box->setStandardButtons(QMessageBox::Ok);
	}
	else
	{
		Box->setText("Welcome!");
		Box->setIcon(QMessageBox::Information);
		Box->setStandardButtons(QMessageBox::Ok);
 
		Run();
	}
 
	Box->exec();
	delete Box;
}
 
void LoginInterface::Exit()
{
	exit(0);
}

#include "LoginInterface.h"

LoginInterface::LoginInterface(QWidget *parent, Qt::WindowFlags flags) :
    QDialog(parent, flags)
{
	// Main
	MainLayout = new QGridLayout;

	// GUI Controls
	UserLabel = new QLabel(tr("User:"));
	UserInput = new QLineEdit;

	PasswordLabel = new QLabel(tr("Password:"));
	PasswordInput = new QLineEdit;
	PasswordInput->setEchoMode(QLineEdit::Password);

	LoginButton = new QPushButton(tr("Login"));
	ExitButton = new QPushButton(tr("Exit"));

	connect(LoginButton, SIGNAL(clicked()), this, SLOT(Login()));
	connect(ExitButton, SIGNAL(clicked()), this, SLOT(Exit()));

	// Adding Widgets
	MainLayout->addWidget(UserLabel);
	MainLayout->addWidget(UserInput);

	MainLayout->addWidget(PasswordLabel);
	MainLayout->addWidget(PasswordInput);

	MainLayout->addWidget(LoginButton);
	MainLayout->addWidget(ExitButton);

	// Client
	ClientLayout = new QGridLayout;
	// Basic Tab
	BasicWidget = new QWidget;
	BasicLayout = new QGridLayout;

	// // Basic Tab - Kontrolki
	UsernameLabel = new QLabel("User:");
	UsernameEdit = new QLineEdit();
	UsernameEdit->setReadOnly(true);

	// // Basic Tab - Dodawanie Widgetow
	BasicLayout->addWidget(UsernameLabel);
	BasicLayout->addWidget(UsernameEdit);

	// // Basic Tab - Ustawianie Layoutu
	BasicWidget->setLayout(BasicLayout);

	// Tabs
	Tabs = new QTabWidget;

	Tabs->addTab(BasicWidget, tr("Basic Info"));

	// misc.
	ClientLayout->addWidget(Tabs);

	setLayout(MainLayout);
	setWindowTitle("Login");
}

void LoginInterface::Run()
{
	delete UserInput;
	delete UserLabel;
	delete PasswordInput;
	delete PasswordLabel;
	delete LoginButton;
	delete ExitButton;
	delete MainLayout;
	// Title
	data[1].clear();
	data[1] = "Logged as " + data[0];
	QWidget::setWindowTitle(data[1]);
	data[1].clear();

	UsernameEdit->insert(data[0]);
	data[0].clear();

	// Layout
	QWidget::setFixedWidth(250);
	QWidget::setLayout(ClientLayout);
}

void LoginInterface::Login()
{
	data[0] = UserInput->text();
	data[1] = PasswordInput->text();

	QMessageBox *Box = new QMessageBox;
	Box->setWindowTitle("Login");

	if(data[0] != "Diath" && data[1] != "test")
	{
		Box->setText("You did enter wrong login data.");
		Box->setIcon(QMessageBox::Critical);
		Box->setStandardButtons(QMessageBox::Ok);
	}
	else
	{
		Box->setText("Welcome!");
		Box->setIcon(QMessageBox::Information);
		Box->setStandardButtons(QMessageBox::Ok);

		Run();
	}

	Box->exec();
	delete Box;
}

void LoginInterface::Exit()
{
	exit(0);
}

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But is there any way to resize QTabWidget like on following screen:

[ChrisW67]

Yes.
You really should use Qt Assistant: QLayout::setContentsMargins()

[Diath]

Finally, I have excepted result thank you very much .

[Diath]

Oh, I'll probably annoy you guys, but you are much better at explaination and examples than documentation :x.

So, I have file named "resource.rcc" in main project directory, with contents:

<!DOCTYPE RCC>
<RCC version="1.0">
	<qresource>
		<file>res/basic.ico</file>
	</qresource>
</RCC>

<!DOCTYPE RCC>
<RCC version="1.0">
	<qresource>
		<file>res/basic.ico</file>
	</qresource>
</RCC>

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Also, in main.cpp I have this above QApplication app()~:

Q_INIT_RESOURCE(resource);

Q_INIT_RESOURCE(resource);

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Also I have added file to project in Qt Creator, now I'm using following code to insert TAB (this code is in another file named LoginInterface.cpp):

Tabs->addTab(BasicWidget, QIcon(":/res/basic.ico"), tr("Basic Info"));

Tabs->addTab(BasicWidget, QIcon(":/res/basic.ico"), tr("Basic Info"));

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But after compiling (CTRL+R) and running binary it doesn't seem to work (Just TAB width changed, but I don't see icon.).

Any tips? (A)

[ChrisW67]

Add the resource file to the RESOURCES entry in your PRO file and dispense with the Q_INIT_RESOURCE() (unless you have a specific reason you require it).

You might try ":res/basic.ico" as the file name, or make your QRC file read

...
<qresource prefix="/">
...

...
<qresource prefix="/">
...

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[Diath]

Of course I have resource info in my pro file, it looks like:

QT       += core gui
 
TARGET = client_launcher
TEMPLATE = app
 
RESOURCES = resource.rcc
 
SOURCES += \
    src/main.cpp \
    src/LoginInterface.cpp
 
HEADERS  += \
    src/LoginInterface.h
 
FORMS    +=

QT       += core gui

TARGET = client_launcher
TEMPLATE = app

RESOURCES = resource.rcc

SOURCES += \
    src/main.cpp \
    src/LoginInterface.cpp

HEADERS  += \
    src/LoginInterface.h

FORMS    +=

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I tried with ":/res/basic.ico", but then, Qt Creator simply doesn't compile code:

:: error: [obj/qrc_resource.cpp] Error 1

:: error: [obj/qrc_resource.cpp] Error 1

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Okay, I've removed Q_INIT_RESOURCE() but I don't think so it helped .

Well, I have open Qt Resource System documentation, and saw this example:

QResource::registerResource("/path/to/myresource.rcc");

QResource::registerResource("/path/to/myresource.rcc");

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So I've added in LoginInterface.cpp (in constructor) this:

QResource::registerResource("../myresource.rcc");

QResource::registerResource("../myresource.rcc");

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(With 2 dots, because my resource file is in higher directory than source files.)
But still I'm failing, any idea? :|

[ChrisW67]

Assuming a simple application without the complications of dynamically loaded plugins etc. you should not need do anything to register the resource file other than list it in the PRO file. No need to code anything, just use it.

I tried with ":/res/basic.ico", but then, Qt Creator simply doesn't compile code:

:: error: [obj/qrc_resource.cpp] Error 1

:: error: [obj/qrc_resource.cpp] Error 1

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I wrote that you might try ":res/basic.ico" as the filename meaning in the cpp source where you load the QIcon, not in the QRC file. Note, there is no "/" between the ":" and the "res". Given that the example below works either way, I doubt this is your problem.

Have you bothered to check if Windows ICO files are listed under QImageReader::supportedImageFormats()?

Here is a complete example:

#include <QtGui>
 
class MainWindow: public QMainWindow {
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        QWidget *central = new QWidget(this);
        QLabel *widget1 = new QLabel(this);
        QPixmap pixmap1(":/res/stop.png");
        widget1->setPixmap(pixmap1);
        QLabel *widget2 = new QLabel(this);
        QPixmap pixmap2(":res/stop.png");
        widget2->setPixmap(pixmap2);
        QVBoxLayout *layout = new QVBoxLayout(central);
        layout->addWidget(widget1);
        layout->addWidget(widget2);
        central->setLayout(layout);
        setCentralWidget(central);
    }
};
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    MainWindow m;
    m.show();
    return app.exec();
}

#include <QtGui>

class MainWindow: public QMainWindow {
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        QWidget *central = new QWidget(this);
        QLabel *widget1 = new QLabel(this);
        QPixmap pixmap1(":/res/stop.png");
        widget1->setPixmap(pixmap1);
        QLabel *widget2 = new QLabel(this);
        QPixmap pixmap2(":res/stop.png");
        widget2->setPixmap(pixmap2);
        QVBoxLayout *layout = new QVBoxLayout(central);
        layout->addWidget(widget1);
        layout->addWidget(widget2);
        central->setLayout(layout);
        setCentralWidget(central);
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    MainWindow m;
    m.show();
    return app.exec();
}

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<!DOCTYPE RCC>
<RCC version="1.0">
<qresource>
<file>res/stop.png</file>
</qresource>
</RCC>

<!DOCTYPE RCC>
<RCC version="1.0">
<qresource>
<file>res/stop.png</file>
</qresource>
</RCC>

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TEMPLATE = app
TARGET = 
RESOURCES+= simple_example.qrc
SOURCES += main.cpp

TEMPLATE = app
TARGET = 
RESOURCES+= simple_example.qrc
SOURCES += main.cpp

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