main.cpp 范例文件

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();
}