4 files changed, 307 insertions, 0 deletions
diff --git a/examples/qtconcurrent/imagescaling/imagescaling.cpp b/examples/qtconcurrent/imagescaling/imagescaling.cpp
new file mode 100644
index 0000000000..6ed7ae7511
--- /dev/null
+++ b/examples/qtconcurrent/imagescaling/imagescaling.cpp
@@ -0,0 +1,146 @@
+/****************************************************************************
+**
+** 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 "imagescaling.h"
+#include "math.h"
+
+#ifndef QT_NO_CONCURRENT
+
+const int imageSize = 100;
+
+QImage scale(const QString &imageFileName)
+{
+    QImage image(imageFileName);
+    return image.scaled(QSize(imageSize, imageSize), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+}
+
+Images::Images(QWidget *parent) 
+: QWidget(parent)
+{
+    setWindowTitle(tr("Image loading and scaling example"));
+    resize(800, 600);
+
+    imageScaling = new QFutureWatcher<QImage>(this);
+    connect(imageScaling, SIGNAL(resultReadyAt(int)), SLOT(showImage(int)));
+    connect(imageScaling, SIGNAL(finished()), SLOT(finished()));
+
+    openButton = new QPushButton(tr("Open Images"));
+    connect(openButton, SIGNAL(clicked()), SLOT(open()));
+
+    cancelButton = new QPushButton(tr("Cancel"));
+    cancelButton->setEnabled(false);
+    connect(cancelButton, SIGNAL(clicked()), imageScaling, SLOT(cancel()));
+   
+    pauseButton = new QPushButton(tr("Pause/Resume"));
+    pauseButton->setEnabled(false);
+    connect(pauseButton, SIGNAL(clicked()), imageScaling, SLOT(togglePaused()));
+   
+    QHBoxLayout *buttonLayout = new QHBoxLayout();
+    buttonLayout->addWidget(openButton);
+    buttonLayout->addWidget(cancelButton);
+    buttonLayout->addWidget(pauseButton);
+    buttonLayout->addStretch();
+
+    imagesLayout = new QGridLayout();
+
+    mainLayout = new QVBoxLayout();
+    mainLayout->addLayout(buttonLayout);
+    mainLayout->addLayout(imagesLayout);
+    mainLayout->addStretch();
+    setLayout(mainLayout);
+}
+
+Images::~Images()
+{
+    imageScaling->cancel();
+    imageScaling->waitForFinished();
+}
+
+void Images::open()
+{
+    // Cancel and wait if we are already loading images.
+    if (imageScaling->isRunning()) {
+        imageScaling->cancel();
+        imageScaling->waitForFinished();
+    }
+
+    // Show a file open dialog at QDesktopServices::PicturesLocation.
+    QStringList files = QFileDialog::getOpenFileNames(this, tr("Select Images"), 
+                            QDesktopServices::storageLocation(QDesktopServices::PicturesLocation),
+                            "*.jpg *.png");
+
+    if (files.count() == 0)
+        return;
+
+    // Do a simple layout.
+    qDeleteAll(labels);
+    labels.clear();
+
+    int dim = sqrt(qreal(files.count())) + 1;
+    for (int i = 0; i < dim; ++i) {
+        for (int j = 0; j < dim; ++j) {
+            QLabel *imageLabel = new QLabel;
+            imageLabel->setFixedSize(imageSize,imageSize);
+            imagesLayout->addWidget(imageLabel,i,j);
+            labels.append(imageLabel);
+        }
+    }
+
+    // Use mapped to run the thread safe scale function on the files.
+    imageScaling->setFuture(QtConcurrent::mapped(files, scale));
+
+    openButton->setEnabled(false);
+    cancelButton->setEnabled(true);
+    pauseButton->setEnabled(true);
+}
+
+void Images::showImage(int num)
+{
+    labels[num]->setPixmap(QPixmap::fromImage(imageScaling->resultAt(num)));
+}
+
+void Images::finished()
+{
+    openButton->setEnabled(true);
+    cancelButton->setEnabled(false);
+    pauseButton->setEnabled(false);
+}
+
+#endif // QT_NO_CONCURRENT
+
diff --git a/examples/qtconcurrent/imagescaling/imagescaling.h b/examples/qtconcurrent/imagescaling/imagescaling.h
new file mode 100644
index 0000000000..096e880b1b
--- /dev/null
+++ b/examples/qtconcurrent/imagescaling/imagescaling.h
@@ -0,0 +1,81 @@
+/****************************************************************************
+**
+** 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."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#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
diff --git a/examples/qtconcurrent/imagescaling/imagescaling.pro b/examples/qtconcurrent/imagescaling/imagescaling.pro
new file mode 100644
index 0000000000..b9601ad48b
--- /dev/null
+++ b/examples/qtconcurrent/imagescaling/imagescaling.pro
@@ -0,0 +1,17 @@
+TEMPLATE = app
+DEPENDPATH += .
+INCLUDEPATH += .
+
+# Input
+SOURCES += main.cpp imagescaling.cpp
+HEADERS += imagescaling.h
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/qtbase/qtconcurrent/imagescaling
+sources.files = $$SOURCES $$HEADERS $$FORMS $$RESOURCES *.pro *.png
+sources.path = $$[QT_INSTALL_EXAMPLES]/qtbase/qtconcurrent/imagescaling
+INSTALLS += target sources
+
+symbian: include($$QT_SOURCE_TREE/examples/symbianpkgrules.pri)
+
+wince*: DEPLOYMENT_PLUGIN += qgif qjpeg qtiff
diff --git a/examples/qtconcurrent/imagescaling/main.cpp b/examples/qtconcurrent/imagescaling/main.cpp
new file mode 100644
index 0000000000..de64116f1c
--- /dev/null
+++ b/examples/qtconcurrent/imagescaling/main.cpp
@@ -0,0 +1,63 @@
+/****************************************************************************
+**
+** 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
+
+#include "imagescaling.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc,argv);
+
+    Images imageView;
+    imageView.show();
+
+    return app.exec();
+}
+
+#else
+
+int main()
+{
+    qDebug() << "Qt Concurrent is not supported on this platform";
+}
+
+#endif