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#include <QDomDocument>
#include <QEventLoop>
#include <QFile>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QThread>
#include <ThreadWeaver/Exception>
#include <ThreadWeaver/ThreadWeaver>
#include "MainWidget.h"
#include "ViewController.h"
ViewController::ViewController(MainWidget *mainwidget)
: QObject() // no parent
, m_apiPostUrl(QStringLiteral("http://fickedinger.tumblr.com/api/read?id=94635924143"))
//@@snippet_begin(hellointernet-sequence)
{
connect(this, SIGNAL(setImage(QImage)), mainwidget, SLOT(setImage(QImage)));
connect(this, SIGNAL(setCaption(QString)), mainwidget, SLOT(setCaption(QString)));
connect(this, SIGNAL(setStatus(QString)), mainwidget, SLOT(setStatus(QString)));
using namespace ThreadWeaver;
auto s = new Sequence;
*s << make_job([=]() {
loadPlaceholderFromResource();
}) << make_job([=]() {
loadPostFromTumblr();
}) << make_job([=]() {
loadImageFromTumblr();
});
stream() << s;
}
//@@snippet_end
ViewController::~ViewController()
{
ThreadWeaver::Queue::instance()->finish();
}
//@@snippet_begin(hellointernet-loadresource)
void ViewController::loadPlaceholderFromResource()
{
QThread::msleep(500);
showResourceImage("IMG_20140813_004131.png");
Q_EMIT setStatus(tr("Downloading post..."));
}
//@@snippet_end
//@@snippet_begin(hellointernet-loadpost)
void ViewController::loadPostFromTumblr()
{
const QUrl url(m_apiPostUrl);
auto const data = download(url);
Q_EMIT setStatus(tr("Post downloaded..."));
QDomDocument doc;
if (!doc.setContent(data)) {
error(tr("Post format not recognized!"));
}
auto textOfFirst = [&doc](const char *name) {
auto const s = QString::fromLatin1(name);
auto elements = doc.elementsByTagName(s);
if (elements.isEmpty()) {
return QString();
}
return elements.at(0).toElement().text();
};
auto const caption = textOfFirst("photo-caption");
if (caption.isEmpty()) {
error(tr("Post does not contain a caption!"));
}
Q_EMIT setCaption(caption);
auto const imageUrl = textOfFirst("photo-url");
if (imageUrl.isEmpty()) {
error(tr("Post does not contain an image!"));
}
m_fullPostUrl = attributeTextFor(doc, "post", "url-with-slug");
if (m_fullPostUrl.isEmpty()) {
error(tr("Response does not contain URL with slug!"));
}
m_imageUrl = QUrl(imageUrl);
showResourceImage("IMG_20140813_004131-colors-cubed.png");
Q_EMIT setStatus(tr("Downloading image..."));
QThread::msleep(500);
}
//@@snippet_end
void ViewController::loadImageFromTumblr()
{
auto const data = download(m_imageUrl);
Q_EMIT setStatus(tr("Image downloaded..."));
const QImage image = QImage::fromData(data);
if (!image.isNull()) {
Q_EMIT setImage(image);
Q_EMIT setStatus(tr("Download complete (see %1).").arg(m_fullPostUrl));
} else {
error(tr("Image format error!"));
}
}
QByteArray ViewController::download(const QUrl &url)
{
QNetworkAccessManager manager;
QEventLoop loop;
QObject::connect(&manager, SIGNAL(finished(QNetworkReply *)), &loop, SLOT(quit()));
auto reply = manager.get(QNetworkRequest(url));
loop.exec();
if (reply->error() == QNetworkReply::NoError) {
const QByteArray data = reply->readAll();
return data;
} else {
error(tr("Unable to download data for \"%1\"!").arg(url.toString()));
return QByteArray();
}
}
//@@snippet_begin(hellointernet-error)
void ViewController::error(const QString &message)
{
showResourceImage("IMG_20140813_004131-colors-cubed.png");
Q_EMIT setCaption(tr("Error"));
Q_EMIT setStatus(tr("%1").arg(message));
throw ThreadWeaver::JobFailed(message);
}
//@@snippet_end
void ViewController::showResourceImage(const char *file)
{
const QString path(QStringLiteral("://resources/%1").arg(QString::fromLatin1(file)));
Q_ASSERT(QFile::exists(path));
const QImage i(path);
Q_ASSERT(!i.isNull());
Q_EMIT setImage(i);
}
QString ViewController::attributeTextFor(const QDomDocument &doc, const char *tag, const char *attribute)
{
auto const tagString = QString::fromLatin1(tag);
auto const attributeString = QString::fromLatin1(attribute);
auto elements = doc.elementsByTagName(tagString);
if (elements.isEmpty()) {
return QString();
}
const QString content = elements.at(0).toElement().attribute(attributeString);
return content;
}
#include "moc_ViewController.cpp"
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