Change project directory structure.

Change project directory structure according to application structure.
Change 'nox' configuration option to something more meaningful 'nogui'.
Rename 'Icons' folder to 'icons' (similar to other folders).
Partially add 'nowebui' option support.
Remove QConf project file.

src/gui/rss/htmlbrowser.cpp

@@ -0,0 +1,93 @@
+#include "htmlbrowser.h"
+
+#include <QDebug>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+#include <QNetworkDiskCache>
+#include <QStyle>
+#include <QApplication>
+#include <QDir>
+#include <QDateTime>
+#include <QScrollBar>
+
+#include "fs_utils.h"
+
+HtmlBrowser::HtmlBrowser(QWidget* parent)
+    : QTextBrowser(parent)
+{
+    m_netManager = new QNetworkAccessManager(this);
+    m_diskCache = new QNetworkDiskCache(this);
+    m_diskCache->setCacheDirectory(QDir::cleanPath(fsutils::cacheLocation() + "/rss"));
+    m_diskCache->setMaximumCacheSize(50 * 1024 * 1024);
+    qDebug() << "HtmlBrowser  cache path:" << m_diskCache->cacheDirectory() << " max size:" << m_diskCache->maximumCacheSize() / 1024 / 1024 << "MB";
+    m_netManager->setCache(m_diskCache);
+
+    connect(m_netManager, SIGNAL(finished(QNetworkReply *)), this, SLOT(resourceLoaded(QNetworkReply*)));
+}
+
+HtmlBrowser::~HtmlBrowser()
+{
+}
+
+QVariant HtmlBrowser::loadResource(int type, const QUrl &name)
+{
+    if(type == QTextDocument::ImageResource) {
+        QUrl url(name);
+        if(url.scheme().isEmpty())
+            url.setScheme("http");
+
+        QIODevice *dev = m_diskCache->data(url);
+        if(dev != 0) {
+            qDebug() << "HtmlBrowser::loadResource() cache " << url.toString();
+            QByteArray res = dev->readAll();
+            delete dev;
+            return res;
+        }
+
+        if(!m_activeRequests.contains(url)) {
+            m_activeRequests.insert(url, true);
+            qDebug() << "HtmlBrowser::loadResource() get " << url.toString();
+            QNetworkRequest req(url);
+            req.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache);
+            m_netManager->get(req);
+        }
+
+        return QVariant();
+    }
+
+    return QTextBrowser::loadResource(type, name);
+}
+
+void HtmlBrowser::resourceLoaded(QNetworkReply *reply)
+{
+    m_activeRequests.remove(reply->request().url());
+
+    if(reply->error() == QNetworkReply::NoError && reply->size() > 0) {
+        qDebug() << "HtmlBrowser::resourceLoaded() save " << reply->request().url().toString();
+    }
+    else {
+        // If resource failed to load, replace it with warning icon and store it in cache for 1 day.
+        // Otherwise HTMLBrowser will keep trying to download it every time article is displayed,
+        // since it's not possible to cache error responses.
+        QNetworkCacheMetaData metaData;
+        QNetworkCacheMetaData::AttributesMap atts;
+        metaData.setUrl(reply->request().url());
+        metaData.setSaveToDisk(true);
+        atts[QNetworkRequest::HttpStatusCodeAttribute] = 200;
+        atts[QNetworkRequest::HttpReasonPhraseAttribute] = "Ok";
+        metaData.setAttributes(atts);
+        metaData.setLastModified(QDateTime::currentDateTime());
+        metaData.setExpirationDate(QDateTime::currentDateTime().addDays(1));
+        QIODevice *dev = m_diskCache->prepare(metaData);
+        if(!dev)
+            return;
+        QApplication::style()->standardIcon(QStyle::SP_MessageBoxWarning).pixmap(32, 32).save(dev, "PNG");
+        m_diskCache->insert(dev);
+    }
+    // Refresh the document display and keep scrollbars where they are
+    int sx = horizontalScrollBar()->value();
+    int sy = verticalScrollBar()->value();
+    document()->setHtml(document()->toHtml());
+    horizontalScrollBar()->setValue(sx);
+    verticalScrollBar()->setValue(sy);
+}