- Enginio Manual
- Enginio C++ Classes and Examples
- Enginio C++ Examples - Image Gallery
- mainwindow.cpp Example File
- Enginio 1.2.1 Reference Documentation

# mainwindow.cpp Example File

image-gallery-cpp/mainwindow.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
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    **   * Redistributions of source code must retain the above copyright
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    **     the documentation and/or other materials provided with the
    **     distribution.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #include <QtWidgets>
    #include <QDebug>
    #include <QFrame>
    #include <QLabel>
    #include <QListView>
    #include <QMenu>
    #include <QNetworkAccessManager>
    #include <QPushButton>
    #include <QTimer>
    #include <QVBoxLayout>

    #include <enginioclient.h>
    #include <enginioreply.h>

    // To get the backend right, we use a helper class in the example.
    // Usually one would just insert the backend information below.
    #include "backendhelper.h"

    #include "imageobject.h"
    #include "mainwindow.h"
    #include "imagemodel.h"

    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
    {
        setWindowTitle(QStringLiteral("Enginio Image Gallery"));

        m_client = new EnginioClient(this);
        m_client->setBackendId(backendId("image-gallery"));

        m_model = new ImageModel(this);
        m_model->setClient(m_client);

        m_view = new QListView;
        m_view->setModel(m_model);
        m_view->setViewMode(QListView::IconMode);
        m_view->setGridSize(QSize(104, 104));

        m_fileDialog = new QFileDialog(this);
        m_fileDialog->setFileMode(QFileDialog::ExistingFile);
        m_fileDialog->setNameFilter("Image files (*.png *.jpg *.jpeg)");
        connect(m_fileDialog, SIGNAL(fileSelected(QString)),
                this, SLOT(fileSelected(QString)));

        m_uploadButton = new QPushButton("Upload image");
        connect(m_uploadButton, SIGNAL(clicked()),
                m_fileDialog, SLOT(show()));

        QFrame *frame = new QFrame;
        QVBoxLayout *windowLayout = new QVBoxLayout(frame);
        windowLayout->addWidget(m_view);
        windowLayout->addWidget(m_uploadButton);
        setCentralWidget(frame);

        queryImages();
    }

    QSize MainWindow::sizeHint() const
    {
        return QSize(500, 700);
    }

    void MainWindow::queryImages()
    {
        QJsonObject query;
        query.insert("objectType", QStringLiteral("objects.image"));
        QJsonObject fileObject;
        fileObject.insert("file", QJsonObject());

        // Use include parameter to request full "file" object for every result
        // object including image and thumbnail URLs.
        query.insert("include", fileObject);

        // Filter out objects which have not yet been uploaded completely
        QJsonObject filter;
        QJsonObject exists;
        exists.insert("$exists", true);
        filter.insert("file.id", exists);
        query.insert("query", filter);

        m_model->setQuery(query);
    }

    void MainWindow::error(EnginioReply *error)
    {
        qWarning() << Q_FUNC_INFO << error;
    }

    void MainWindow::fileSelected(const QString &filePath)
    {
        if (filePath.isEmpty())
            return;

        QJsonObject object;
        object.insert("objectType", QString("objects.image"));
        QString fileName = filePath.split(QDir::separator()).last();
        object.insert("name", fileName);
        object.insert("localPath", filePath);
        EnginioReply *reply = m_model->append(object);
        connect(reply, SIGNAL(finished(EnginioReply*)), this, SLOT(beginUpload(EnginioReply*)));
    }

    void MainWindow::beginUpload(EnginioReply *reply)
    {
        reply->deleteLater();
        QString path = reply->data().value("localPath").toString();
        QString objectId = reply->data().value("id").toString();

        QJsonObject object;
        object.insert("id", objectId);
        object.insert("objectType", QStringLiteral("objects.image"));
        object.insert("propertyName", QStringLiteral("file"));

        QJsonObject fileObject;
        fileObject.insert(QStringLiteral("fileName"), path);

        QJsonObject uploadJson;
        uploadJson.insert(QStringLiteral("targetFileProperty"), object);
        uploadJson.insert(QStringLiteral("file"), fileObject);

        EnginioReply *upload = m_client->uploadFile(uploadJson, QUrl::fromUserInput(path));
        connect(upload, SIGNAL(finished(EnginioReply*)), upload, SLOT(deleteLater()));
    }