qt-solutions/qtpropertybrowser/examples/object_controller/main.cpp

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#include <QtGui/QApplication>
#include <QtGui/QSpinBox>
#include <QtGui/QDialogButtonBox>
#include <QtGui/QLineEdit>
#include <QtGui/QDialog>
#include <QtGui/QComboBox>
#include <QtGui/QToolButton>
#include <QtGui/QPushButton>
#include <QtGui/QBoxLayout>
#include <QtGui/QTreeWidget>
#include <QtGui/QAction>
#include <QtGui/QDesktopWidget>
#include <QtGui/QTextDocument>
#include <QtGui/QCalendarWidget>
#include <QtCore/QTimeLine>
#include "objectcontroller.h"

class MyController : public QDialog
{
    Q_OBJECT
public:
    MyController(QWidget *parent = 0);
    ~MyController();
private slots:
    void createAndControl();
private:
    QComboBox *theClassCombo;
    ObjectController *theController;
    QStringList theClassNames;
    QObject *theControlledObject;
};

MyController::MyController(QWidget *parent)
    : QDialog(parent), theControlledObject(0)
{
    theClassCombo = new QComboBox(this);
    QToolButton *button = new QToolButton(this);
    theController = new ObjectController(this);
    QDialogButtonBox *buttonBox = new QDialogButtonBox(this);

    connect(button, SIGNAL(clicked()), this, SLOT(createAndControl()));
    connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));

    button->setText(tr("Create And Control"));
    buttonBox->setStandardButtons(QDialogButtonBox::Close);

    QVBoxLayout *layout = new QVBoxLayout(this);
    QHBoxLayout *internalLayout = new QHBoxLayout();
    internalLayout->addWidget(theClassCombo);
    internalLayout->addWidget(button);
    layout->addLayout(internalLayout);
    layout->addWidget(theController);
    layout->addWidget(buttonBox);

    theClassNames.append(QLatin1String("QWidget"));
    theClassNames.append(QLatin1String("QPushButton"));
    theClassNames.append(QLatin1String("QDialogButtonBox"));
    theClassNames.append(QLatin1String("QTreeWidget"));
    theClassNames.append(QLatin1String("QCalendarWidget"));
    theClassNames.append(QLatin1String("QAction"));
    theClassNames.append(QLatin1String("QTimeLine"));
    theClassNames.append(QLatin1String("QTextDocument"));

    theClassCombo->addItems(theClassNames);
}

MyController::~MyController()
{
    if (theControlledObject)
        delete theControlledObject;
}

void MyController::createAndControl()
{
    QObject *newObject = 0;
    QString className = theClassNames.at(theClassCombo->currentIndex());
    if (className == QLatin1String("QWidget"))
        newObject = new QWidget();
    else if (className == QLatin1String("QPushButton"))
        newObject = new QPushButton();
    else if (className == QLatin1String("QDialogButtonBox"))
        newObject = new QDialogButtonBox();
    else if (className == QLatin1String("QTreeWidget"))
        newObject = new QTreeWidget();
    else if (className == QLatin1String("QCalendarWidget"))
        newObject = new QCalendarWidget();
    else if (className == QLatin1String("QAction"))
        newObject = new QAction(0);
    else if (className == QLatin1String("QTimeLine"))
        newObject = new QTimeLine();
    else if (className == QLatin1String("QTextDocument"))
        newObject = new QTextDocument();

    if (!newObject)
        return;

    QWidget *newWidget = qobject_cast<QWidget *>(newObject);
    if (newWidget) {
        QRect r = newWidget->geometry();
        r.setSize(newWidget->sizeHint());
        r.setWidth(qMax(r.width(), 150));
        r.setHeight(qMax(r.height(), 50));
        r.moveCenter(QApplication::desktop()->geometry().center());
        newWidget->setGeometry(r);
        newWidget->setWindowTitle(tr("Controlled Object: %1").arg(className));
        newWidget->show();
    }

    if (theControlledObject)
        delete theControlledObject;

    theControlledObject = newObject;
    theController->setObject(theControlledObject);
}

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

    MyController *controller = new MyController();
    controller->show();

    int ret = app.exec();

    return ret;
}

#include "main.moc"