main.cpp Example File

gestures/imagegestures/main.cpp
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 #include <QtGui>

 #include "mainwidget.h"
 #include "imagewidget.h"

 static const char helpText[] =
 "Usage: ./imagegestures [options] Directory\n\
 Image Gestures Example\n\
 \n\
 Options:\n\
   --no-pan    Disable pan gesture\n\
   --no-pinch  Disable pinch gesture\n\
   --no-swipe  Disable swipe gesture\n\
   -h, --help  Displays this help.\n\
 \n\
 Arguments:\n\
   Directory   Directory to display\n";

 static void showHelp(const QString errorMessage = QString())
 {
     QString text;
     QTextStream str(&text);
     str << "<html><head/><body>";
     if (!errorMessage.isEmpty())
         str << "<p>" << errorMessage << "</p>";
     str << "<pre>" << helpText << "</pre></body></html>";
     QMessageBox box(errorMessage.isEmpty() ? QMessageBox::Information : QMessageBox::Warning,
                     QLatin1String("Image Gestures Example"), text,
                     QMessageBox::Ok);
     box.exec();
 }

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     QCoreApplication::setApplicationVersion(QT_VERSION_STR);
     QCoreApplication::setApplicationName(QLatin1String("imagegestures"));

     QStringList arguments = QApplication::arguments();

     QString directory;
     QList<Qt::GestureType> gestures;
     gestures << Qt::PanGesture << Qt::PinchGesture << Qt::SwipeGesture;
     for (int a = 1; a < arguments.size(); ++a) {
         const QString &argument = arguments.at(a);
         if (argument.startsWith(QLatin1Char('-'))) {
             if (argument == QLatin1String("--no-pan"))
                 gestures.removeAll(Qt::PanGesture);
             else if (argument == QLatin1String("--no-pinch"))
                 gestures.removeAll(Qt::PinchGesture);
             else if (argument == QLatin1String("--no-swipe"))
                 gestures.removeAll(Qt::SwipeGesture);
             else if (argument == QLatin1String("--verbose"))
                 ImageWidget::setVerbose(true);
             else if (argument == QLatin1String("-h") || argument == QLatin1String("--help")) {
                 showHelp();
                 return 0;
             } else {
                 showHelp(QLatin1String("Invalid option: ") + argument);
                 return 1;
             }
         } else
             directory = argument;
     }

     MainWidget w;
     w.grabGestures(gestures);
     w.show();

     if (directory.isEmpty()) {
         const QString picturesLocation = QDesktopServices::storageLocation(QDesktopServices::PicturesLocation);
         directory =
             QFileDialog::getExistingDirectory(&w, "Select image folder",
                                               picturesLocation.isEmpty() ? QString() : picturesLocation);
         if (directory.isEmpty())
             return 0;
     }

     w.openDirectory(directory);

     return app.exec();
 }