Qt 4.8: window.cpp Example File (painting/concentriccircles/window.cpp)

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# window.cpp Example File

painting/concentriccircles/window.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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     #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;
     }