Qt Quick Demo - Photo Surface | Qt 5.14

Qt 5.14 | Qt Quick Demo - Photo Surface

Qt 5.14.2 Reference Documentation

# Qt Quick Demo - Photo Surface

      /****************************************************************************
      **
      ** Copyright (C) 2017 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, you may use this file under the terms of the BSD license
      ** as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #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>

      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
          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();
      }