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# window.cpp Example File
painting/concentriccircles/window.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #include <QtGui>

    #include "circlewidget.h"
    #include "window.h"

    Window::Window()
    {
        aliasedLabel = createLabel(tr("Aliased"));
        antialiasedLabel = createLabel(tr("Antialiased"));
        intLabel = createLabel(tr("Int"));
        floatLabel = createLabel(tr("Float"));

        QGridLayout *layout = new QGridLayout;
        layout->addWidget(aliasedLabel, 0, 1);
        layout->addWidget(antialiasedLabel, 0, 2);
        layout->addWidget(intLabel, 1, 0);
        layout->addWidget(floatLabel, 2, 0);

        QTimer *timer = new QTimer(this);

        for (int i = 0; i < 2; ++i) {
            for (int j = 0; j < 2; ++j) {
                circleWidgets[i][j] = new CircleWidget;
                circleWidgets[i][j]->setAntialiased(j != 0);
                circleWidgets[i][j]->setFloatBased(i != 0);

                connect(timer, SIGNAL(timeout()),
                        circleWidgets[i][j], SLOT(nextAnimationFrame()));

                layout->addWidget(circleWidgets[i][j], i + 1, j + 1);
            }
        }
        timer->start(100);
        setLayout(layout);

        setWindowTitle(tr("Concentric Circles"));
    }

    QLabel *Window::createLabel(const QString &text)
    {
        QLabel *label = new QLabel(text);
        label->setAlignment(Qt::AlignCenter);
        label->setMargin(2);
        label->setFrameStyle(QFrame::Box | QFrame::Sunken);
        return label;
    }