Add MPRIS support

Besides MPRIS support, this also adds support for hasPrevious() and
hasNext() in several parts to determine whether the
player/playlist/shuffler has a previous or next item.

core/src/viewmodel/platformmediacontrol_freedesktop.cpp

@@ -0,0 +1,87 @@
+/*
+ * Sailfin: a Jellyfin client written using Qt
+ * Copyright (C) 2021 Chris Josten and the Sailfin Contributors.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "JellyfinQt/viewmodel/platformmediacontrol.h"
+#include "JellyfinQt/platform/freedesktop/mediaplayer2.h"
+#include "JellyfinQt/platform/freedesktop/mediaplayer2player.h"
+
+#include <QDebug>
+#include <QString>
+#include <QtDBus/QtDBus>
+
+namespace Jellyfin {
+namespace ViewModel {
+
+using Platform::FreeDesktop::MediaPlayer2Adaptor;
+using Platform::FreeDesktop::PlayerAdaptor;
+
+class PlatformMediaControlPrivate {
+public:
+    PlatformMediaControlPrivate(PlatformMediaControl *parent);
+    void setupConnection();
+private:
+    PlatformMediaControl *q_ptr;
+    Q_DECLARE_PUBLIC(PlatformMediaControl)
+
+    MediaPlayer2Adaptor *m_mainAdaptor;
+    PlayerAdaptor *m_playerAdaptor;
+    QDBusConnection m_connection;
+public slots:
+    // MPRIS Player methods
+    void Quit();
+
+};
+
+PlatformMediaControl::PlatformMediaControl(QObject *parent)
+    : QObject(parent) {
+    d_ptr = new PlatformMediaControlPrivate(this);
+}
+
+void PlatformMediaControl::setup() {
+    Q_D(PlatformMediaControl);
+    d->setupConnection();
+}
+
+PlatformMediaControlPrivate::PlatformMediaControlPrivate(PlatformMediaControl *parent)
+    : q_ptr(parent),
+      m_mainAdaptor(new MediaPlayer2Adaptor(parent)),
+      m_playerAdaptor(new PlayerAdaptor(parent)),
+      m_connection(QDBusConnection::sessionBus()) {
+
+}
+
+void PlatformMediaControlPrivate::setupConnection() {
+    Q_Q(PlatformMediaControl);
+    if(!m_connection.registerObject(QStringLiteral("/org/mpris/MediaPlayer2"), q)) {
+        qWarning() << "MediaPlayer2 dbus object not registered: " << m_connection.lastError();
+    }
+    if (!m_connection.registerService(QStringLiteral("org.mpris.MediaPlayer2.sailfin.instance").append(QString::number(QCoreApplication::applicationPid())))) {
+        qWarning() << "Could not aqcuire DBus name: " << m_connection.lastError();
+    }
+}
+
+void PlatformMediaControlPrivate::Quit() {
+    Q_Q(PlatformMediaControl);
+    q->requestQuit();
+}
+
+
+
+}
+}

core/src/viewmodel/platformmediacontrol_stub.cpp

@@ -0,0 +1,29 @@
+/*
+ * Sailfin: a Jellyfin client written using Qt
+ * Copyright (C) 2021 Chris Josten and the Sailfin Contributors.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "JellyfinQt/viewmodel/platformmediacontrol.h"
+
+namespace Jellyfin {
+namespace ViewModel {
+
+PlatformMediaControl::PlatformMediaControl(QObject *parent)
+    : QObject(parent) {}
+
+}
+}

core/src/viewmodel/playbackmanager.cpp

@@ -84,6 +84,9 @@ void PlaybackManager::setItem(QSharedPointer<Model::Item> newItem) {
     }
     emit itemChanged(m_displayItem);
 
+    emit hasNextChanged(m_queue->hasNext());
+    emit hasPreviousChanged(m_queue->hasPrevious());
+
     if (m_apiClient == nullptr) {
         qWarning() << "apiClient is not set on this MediaSource instance! Aborting.";
         return;