Child widget does not get resized when main widget is.

[anr78]

I'm getting started with layouts and have some problems. I created a simple project with a QWidget as base class. I setup layouts in the ui file, and everything compiled, ran and resized fine. Then I added a base class that's supposed to keep track of multiple classes with their own ui-files. When I resize base, the widget contents doesn't follow. What am I doing wrong?

// main.cpp
#include <QtGui/QApplication>
#include "base.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    base b;
    b.show();
 
    return a.exec();
}
 
//base.h
 
#ifndef BASE_H
#define BASE_H
 
#include <QWidget>
 
class Widget;
 
class base : public QWidget
{
    Q_OBJECT
public:
    explicit base(QWidget *parent = 0);
 
signals:
 
public slots:
 
private:
    Widget * w;
};
 
#endif // BASE_H
 
//base.cpp
 
#include "base.h"
#include "widget.h"
 
base::base(QWidget *parent) :
    QWidget(parent),
    w(new Widget(this))
{
    w->show();
}
 
// widget.h
 
#ifndef WIDGET_H
#define WIDGET_H
 
#include <QWidget>
 
namespace Ui {
    class Widget;
}
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
 
private:
    Ui::Widget *ui;
};
 
#endif // WIDGET_H
 
// widget.cpp
 
#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}
 
Widget::~Widget()
{
    delete ui;
}

// main.cpp
#include <QtGui/QApplication>
#include "base.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    base b;
    b.show();

    return a.exec();
}

//base.h

#ifndef BASE_H
#define BASE_H

#include <QWidget>

class Widget;

class base : public QWidget
{
    Q_OBJECT
public:
    explicit base(QWidget *parent = 0);

signals:

public slots:

private:
    Widget * w;
};

#endif // BASE_H

//base.cpp

#include "base.h"
#include "widget.h"

base::base(QWidget *parent) :
    QWidget(parent),
    w(new Widget(this))
{
    w->show();
}

// widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
    class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

// widget.cpp

#include "widget.h"
#include "ui_widget.h"

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

Widget::~Widget()
{
    delete ui;
}

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---

Added after 13 minutes:

I solved it by using a stacked layout in base, and adding widget to that.