git.maemo.org Git - situare/blob - src/map/mapfetcher.cpp

   1 #include <QNetworkAccessManager>
   2 #include <QNetworkRequest>
   3 #include <QNetworkReply>
   4 #include <QUrl>
   5 #include <QDebug>
   6 #include <QPixmap>
   7 #include <QNetworkDiskCache>
   8 #include <QDesktopServices>
   9
  10 #include "mapfetcher.h"
  11
  12 static int MAX_PARALLEL_DOWNLOADS = 2;
  13
  14 MapFetcher::MapFetcher(QObject *parent)
  15     : QObject(parent)
  16 {
  17     QNetworkDiskCache *diskCache = new QNetworkDiskCache(this);
  18     diskCache->setCacheDirectory(QDesktopServices::storageLocation(
  19             QDesktopServices::CacheLocation));
  20     m_manager.setCache(diskCache);
  21
  22     connect(&m_manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(downloadFinished(QNetworkReply*)));
  23 }
  24
  25 void MapFetcher::fetchMapImage(const QUrl &url)
  26 {
  27     qDebug() << "fetchMapImage()";
  28     if (url.isEmpty())
  29         return;
  30
  31     //Limit parallel downloads
  32     if (downloadQueue.length() < MAX_PARALLEL_DOWNLOADS)
  33         QTimer::singleShot(0, this, SLOT(startNextDownload()));
  34
  35     downloadQueue.enqueue(url);
  36 }
  37
  38 void MapFetcher::startNextDownload()
  39 {
  40     qDebug() << "startNextDownload()";
  41     if (downloadQueue.isEmpty())
  42         return;
  43
  44     QUrl url = downloadQueue.dequeue();
  45     QNetworkRequest request(url);
  46     request.setRawHeader("User-Agent", "Map Test");
  47     request.setAttribute(QNetworkRequest::CacheLoadControlAttribute,
  48                                               QNetworkRequest::PreferCache);
  49
  50     QNetworkReply *reply = m_manager.get(request);
  51
  52     currentDownloads.append(reply);
  53 }
  54
  55 void MapFetcher::downloadFinished(QNetworkReply *reply)
  56 {
  57     qDebug() << "downloadFinished()";
  58     if (reply->error()) {
  59         emit error(reply->errorString());
  60     }
  61     else {
  62         QImage image;
  63         QUrl url = reply->url();
  64         if (!image.load(reply, 0))
  65             image = QImage();
  66
  67         emit mapImageReceived(url, QPixmap::fromImage(image));
  68     }
  69
  70     currentDownloads.removeAll(reply);
  71     reply->deleteLater();
  72     startNextDownload();
  73 }
  74
  75 MapFetcher::~MapFetcher()
  76 {
  77
  78 }