imagescaling.h Example File

qtconcurrent/imagescaling/imagescaling.h
 /****************************************************************************
 **
 ** Copyright (C) 2015 The Qt Company Ltd.
 ** Contact: http://www.qt.io/licensing/
 **
 ** 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 The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** 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
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
 #ifndef IMAGESCALING_H
 #define IMAGESCALING_H

 #include <QtGui>

 #ifndef QT_NO_CONCURRENT

 class Images : public QWidget
 {
 Q_OBJECT
 public:
     Images(QWidget *parent = 0);
     ~Images();
 public Q_SLOTS:
     void open();
     void showImage(int num);
     void finished();
 private:
     QPushButton *openButton;
     QPushButton *cancelButton;
     QPushButton *pauseButton;
     QVBoxLayout *mainLayout;
     QList<QLabel *> labels;
     QGridLayout *imagesLayout;
     QFutureWatcher<QImage> *imageScaling;
 };

 #else

 // Dummy class required because QT_NO_CONCURRENT is not set when moc is run.
 class Images : public QWidget
 {
 Q_OBJECT
 public Q_SLOTS:
     void open() {}
     void showImage(int) {}
     void finished() {}
 };

 #endif // QT_NO_CONCURRENT

 #endif // IMAGESCALING_H