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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #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);
++ w.show();
++
++ 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();
++ }