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Diffstat (limited to 'examples/qtconcurrent/progressdialog/main.cpp')
-rw-r--r-- | examples/qtconcurrent/progressdialog/main.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/examples/qtconcurrent/progressdialog/main.cpp b/examples/qtconcurrent/progressdialog/main.cpp new file mode 100644 index 0000000000..307baed45b --- /dev/null +++ b/examples/qtconcurrent/progressdialog/main.cpp @@ -0,0 +1,99 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** 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 Nokia Corporation 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. +** +** 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." +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtGui> + +#ifndef QT_NO_CONCURRENT + +using namespace QtConcurrent; + +const int iterations = 20; + +void spin(int &iteration) +{ + const int work = 1000 * 1000 * 40; + volatile int v = 0; + for (int j = 0; j < work; ++j) + ++v; + + qDebug() << "iteration" << iteration << "in thread" << QThread::currentThreadId(); +} + +int main(int argc, char **argv) +{ + QApplication app(argc, argv); + + // Prepare the vector. + QVector<int> vector; + for (int i = 0; i < iterations; ++i) + vector.append(i); + + // Create a progress dialog. + QProgressDialog dialog; + dialog.setLabelText(QString("Progressing using %1 thread(s)...").arg(QThread::idealThreadCount())); + + // Create a QFutureWatcher and connect signals and slots. + QFutureWatcher<void> futureWatcher; + QObject::connect(&futureWatcher, SIGNAL(finished()), &dialog, SLOT(reset())); + QObject::connect(&dialog, SIGNAL(canceled()), &futureWatcher, SLOT(cancel())); + QObject::connect(&futureWatcher, SIGNAL(progressRangeChanged(int,int)), &dialog, SLOT(setRange(int,int))); + QObject::connect(&futureWatcher, SIGNAL(progressValueChanged(int)), &dialog, SLOT(setValue(int))); + + // Start the computation. + futureWatcher.setFuture(QtConcurrent::map(vector, spin)); + + // Display the dialog and start the event loop. + dialog.exec(); + + futureWatcher.waitForFinished(); + + // Query the future to check if was canceled. + qDebug() << "Canceled?" << futureWatcher.future().isCanceled(); +} + +#else + +int main() +{ + qDebug() << "Qt Concurrent is not yet supported on this platform"; +} + +#endif + |