Qt Quick Demo - Photo Surface

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#ifdef QT_WIDGETS_LIB #include <QtWidgets/QApplication> #else #include <QtGui/QGuiApplication> #endif #include <QtQml/QQmlApplicationEngine> #include <QtQml/QQmlContext> #include <QtQuick/QQuickWindow> #include <QtGui/QImageReader> #include <QtCore/QCommandLineParser> #include <QtCore/QCommandLineOption> #include <QtCore/QDebug> #include <QtCore/QDir> #include <QtCore/QMimeDatabase> #include <QtCore/QStandardPaths> #include <QtCore/QUrl> #ifdef REQUEST_PERMISSIONS_ON_ANDROID #include <QtAndroid> bool requestStoragePermission() { using namespace QtAndroid; QString permission = QStringLiteral("android.permission.WRITE_EXTERNAL_STORAGE"); const QHash<QString, PermissionResult> results = requestPermissionsSync(QStringList({permission})); if (!results.contains(permission) || results[permission] == PermissionResult::Denied) { qWarning() << "Couldn't get permission: " << permission; return false; } return true; } #endif static QStringList imageNameFilters() { QStringList result; QMimeDatabase mimeDatabase; const auto supportedMimeTypes = QImageReader::supportedMimeTypes(); for (const QByteArray &m : supportedMimeTypes) { const auto suffixes = mimeDatabase.mimeTypeForName(m).suffixes(); for (const QString &suffix : suffixes) result.append(QLatin1String("*.") + suffix); } return result; } int main(int argc, char* argv[]) { // The reason to use QApplication is that QWidget-based dialogs // are the native dialogs on Qt-based platforms like KDE, // but they cannot be instantiated if this is a QGuiApplication. #ifdef QT_WIDGETS_LIB QApplication app(argc, argv); #else QGuiApplication app(argc, argv); #endif #ifdef REQUEST_PERMISSIONS_ON_ANDROID if (!requestStoragePermission()) return -1; #endif QQuickWindow::setDefaultAlphaBuffer(true); QCoreApplication::setApplicationName(QStringLiteral("Photosurface")); QCoreApplication::setOrganizationName(QStringLiteral("QtProject")); QCoreApplication::setApplicationVersion(QLatin1String(QT_VERSION_STR)); QCommandLineParser parser; parser.setApplicationDescription(QStringLiteral("Qt Quick Demo - Photo Surface")); parser.addHelpOption(); parser.addVersionOption(); parser.addPositionalArgument(QStringLiteral("directory"), QStringLiteral("The image directory or URL to show.")); parser.process(app); QUrl initialUrl; if (!parser.positionalArguments().isEmpty()) { initialUrl = QUrl::fromUserInput(parser.positionalArguments().first(), QDir::currentPath(), QUrl::AssumeLocalFile); if (!initialUrl.isValid()) { qWarning().nospace() << "Invalid argument: \"" << parser.positionalArguments().first() << "\": " << initialUrl.errorString(); return 1; } } const QStringList nameFilters = imageNameFilters(); QQmlApplicationEngine engine; QQmlContext *context = engine.rootContext(); QUrl picturesLocationUrl = QUrl::fromLocalFile(QDir::homePath()); const QStringList picturesLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation); if (!picturesLocations.isEmpty()) { picturesLocationUrl = QUrl::fromLocalFile(picturesLocations.first()); if (initialUrl.isEmpty() && !QDir(picturesLocations.first()).entryInfoList(nameFilters, QDir::Files).isEmpty()) { initialUrl = picturesLocationUrl; } } context->setContextProperty(QStringLiteral("contextPicturesLocation"), picturesLocationUrl); context->setContextProperty(QStringLiteral("contextInitialUrl"), initialUrl); context->setContextProperty(QStringLiteral("contextImageNameFilters"), nameFilters); engine.load(QUrl("qrc:///photosurface.qml")); if (engine.rootObjects().isEmpty()) return -1; return app.exec(); }