main.cpp Example File

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#include <QtWidgets> #include "mainwidget.h" static void showHelp(QCommandLineParser &parser, const QString errorMessage = QString()) { QString text; QTextStream str(&text); str << "<html><head/><body>"; if (!errorMessage.isEmpty()) str << "<p>" << errorMessage << "</p>"; str << "<pre>" << parser.helpText() << "</pre></body></html>"; QMessageBox box(errorMessage.isEmpty() ? QMessageBox::Information : QMessageBox::Warning, QGuiApplication::applicationDisplayName(), text, QMessageBox::Ok); box.setTextInteractionFlags(Qt::TextBrowserInteraction); box.exec(); } int main(int argc, char *argv[]) { QApplication app(argc, argv); QCoreApplication::setApplicationVersion(QT_VERSION_STR); QCoreApplication::setApplicationName(QStringLiteral("imagegestures")); QGuiApplication::setApplicationDisplayName(QStringLiteral("Image Gestures Example")); QCommandLineParser commandLineParser; const QCommandLineOption disablePanOption("no-pan", "Disable pan gesture"); commandLineParser.addOption(disablePanOption); const QCommandLineOption disablePinchOption("no-pinch", "Disable pinch gesture"); commandLineParser.addOption(disablePinchOption); const QCommandLineOption disableSwipeOption("no-swipe", "Disable swipe gesture"); commandLineParser.addOption(disableSwipeOption); const QCommandLineOption helpOption = commandLineParser.addHelpOption(); commandLineParser.addPositionalArgument(QStringLiteral("Directory"), QStringLiteral("Directory to display")); const QString description = QGuiApplication::applicationDisplayName() + QLatin1String("\n\nEnable \"debug\" on the logging category \"qt.examples.imagegestures\" in order to\n" "in order to obtain verbose information about Qt's gesture event processing,\n" "for example by setting the environment variables QT_LOGGING_RULES to\n" "qt.examples.imagegestures.debug=true\n"); commandLineParser.setApplicationDescription(description); commandLineParser.process(QCoreApplication::arguments()); QStringList arguments = commandLineParser.positionalArguments(); if (!arguments.isEmpty() && !QFileInfo(arguments.front()).isDir()) { showHelp(commandLineParser, QLatin1Char('"') + QDir::toNativeSeparators(arguments.front()) + QStringLiteral("\" is not a directory.")); return -1; } QList<Qt::GestureType> gestures; if (!commandLineParser.isSet(disablePanOption)) gestures << Qt::PanGesture; if (!commandLineParser.isSet(disablePinchOption)) gestures << Qt::PinchGesture; if (!commandLineParser.isSet(disableSwipeOption)) gestures << Qt::SwipeGesture; MainWidget w; w.grabGestures(gestures);; if (arguments.isEmpty()) { const QStringList picturesLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation); const QString directory = QFileDialog::getExistingDirectory(&w, "Select image folder", picturesLocations.isEmpty() ? QString() : picturesLocations.front()); if (directory.isEmpty()) return 0; arguments.append(directory); } w.openDirectory(arguments.front()); return app.exec(); }

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