145 lines
4.2 KiB
C++
145 lines
4.2 KiB
C++
//
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// Copyright (C) 2017 James Turner zakalawe@mac.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include "fgqcanvasimageloader.h"
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#include <QDebug>
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#include <QNetworkAccessManager>
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#include <QStandardPaths>
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#include <QDir>
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#include <QFile>
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#include <QFileInfo>
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class TransferSignalHolder : public QObject
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{
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Q_OBJECT
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public:
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TransferSignalHolder(QObject* pr) : QObject(pr) { }
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signals:
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void trigger();
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};
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FGQCanvasImageLoader::FGQCanvasImageLoader(QNetworkAccessManager* dl, QObject* pr)
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: QObject(pr)
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, m_downloader(dl)
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{
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}
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void FGQCanvasImageLoader::onDownloadFinished()
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{
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QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
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QPixmap pm;
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if (!pm.loadFromData(reply->readAll())) {
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qWarning() << "image loading failed";
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} else {
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QByteArray imagePath = reply->property("image").toByteArray();
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m_cache.insert(imagePath, pm);
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// cache on disk also, so snapshots work
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writeToDiskCache(imagePath, reply);
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TransferSignalHolder* signalHolder = reply->findChild<TransferSignalHolder*>("holder");
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if (signalHolder) {
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qDebug() << "triggering image updates";
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signalHolder->trigger();
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}
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}
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m_transfers.removeOne(reply);
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reply->deleteLater();
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}
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void FGQCanvasImageLoader::writeToDiskCache(QByteArray imagePath, QNetworkReply* reply)
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{
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QDir cacheDir(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
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QString absPath = cacheDir.absoluteFilePath(imagePath);
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QFileInfo finfo(imagePath);
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cacheDir.mkpath(finfo.dir().path());
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QFile f(absPath);
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if (!f.open(QIODevice::WriteOnly)) {
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qWarning() << "failed to open cache file" << f.fileName();
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}
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f.write(reply->readAll());
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f.close();
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}
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void FGQCanvasImageLoader::setHost(QString hostName, int portNumber)
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{
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m_hostName = hostName;
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m_port = portNumber;
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}
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QPixmap FGQCanvasImageLoader::getImage(const QByteArray &imagePath)
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{
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if (m_cache.contains(imagePath)) {
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// cached, easy
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return m_cache.value(imagePath);
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}
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QString diskCachePath = QStandardPaths::locate(QStandardPaths::CacheLocation, imagePath);
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if (!diskCachePath.isEmpty()) {
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QPixmap pix;
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pix.load(diskCachePath);
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m_cache.insert(imagePath, pix);
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qDebug() << "loaded from on-disk cache:" << imagePath;
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return pix;
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}
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QUrl url;
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url.setScheme("http");
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url.setHost(m_hostName);
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url.setPort(m_port);
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url.setPath("/aircraft-dir/" + imagePath);
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Q_FOREACH (QNetworkReply* transfer, m_transfers) {
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if (transfer->url() == url) {
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return QPixmap(); // transfer already active
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}
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}
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QNetworkReply* reply = m_downloader->get(QNetworkRequest(url));
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reply->setProperty("image", imagePath);
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connect(reply, &QNetworkReply::finished, this, &FGQCanvasImageLoader::onDownloadFinished);
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m_transfers.append(reply);
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return QPixmap();
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}
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void FGQCanvasImageLoader::connectToImageLoaded(const QByteArray &imagePath, QObject *receiver, const char *slot)
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{
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Q_FOREACH (QNetworkReply* transfer, m_transfers) {
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if (transfer->property("image").toByteArray() == imagePath) {
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QObject* signalHolder = transfer->findChild<QObject*>("holder");
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if (!signalHolder) {
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signalHolder = new TransferSignalHolder(transfer);
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signalHolder->setObjectName("holder");
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}
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connect(signalHolder, SIGNAL(trigger()), receiver, slot);
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return;
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}
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}
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qWarning() << "no transfer active for" << imagePath;
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}
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#include "fgqcanvasimageloader.moc"
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