Qt 1.6 | Enginio Manual | Enginio C++ Examples - Image Gallery | imageobject.cpp Example File

Qt 1.6.3 Reference Documentation

# imageobject.cpp Example File

image-gallery-cpp/imageobject.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** 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."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #include "imageobject.h"

      #include <QtNetwork>
      #include <Enginio/enginioclient.h>
      #include <Enginio/enginioreply.h>

      ImageObject::ImageObject(EnginioClient *enginio)
          : m_enginio(enginio)
      {}

      void ImageObject::setObject(const QJsonObject &object)
      {
          m_object = object;
          QString fileId;
          fileId = object.value("file").toObject().value("id").toString();

          if (!fileId.isEmpty()) {
              QJsonObject fileObject;
              fileObject.insert("id", fileId);
              fileObject.insert("variant", QString("thumbnail"));
              EnginioReply *reply = m_enginio->downloadUrl(fileObject);
              connect(reply, SIGNAL(finished(EnginioReply*)), this, SLOT(replyFinished(EnginioReply*)));
          } else {
              // Try to fall back to the local file
              QString localPath = object.value("localPath").toString();
              if (QFile::exists(localPath)) {
                  m_image = QImage(localPath);
                  emit imageChanged(object.value("id").toString());
              }
          }
      }

      void ImageObject::replyFinished(EnginioReply *enginioReply)
      {
          QString url = enginioReply->data().value("expiringUrl").toString();
          QNetworkRequest request(url);
          m_reply = m_enginio->networkManager()->get(request);
          m_reply->setParent(this);
          connect(m_reply, SIGNAL(finished()), this, SLOT(downloadFinished()));
      }

      void ImageObject::downloadFinished()
      {
          QByteArray imageData = m_reply->readAll();
          m_image.loadFromData(imageData);
          emit imageChanged(m_object.value("id").toString());

          m_reply->deleteLater();
          m_reply = 0;
      }

      QPixmap ImageObject::thumbnail()
      {
          if (m_image.isNull() || !m_thumbnail.size().isNull())
              return m_thumbnail;
          m_thumbnail = QPixmap::fromImage(m_image.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation));
          return m_thumbnail;
      }