DBUS enable/disable screen saver

Calls org.freedesktop.ScreenSaver.Inhibit/UnInhibit to disable/enable
the screen saver.

Plex-CLA-1.0-signed-off-by: Max Resch <resch.max@gmail.com>

src/power/PowerComponentDBus.cpp

@@ -8,6 +8,10 @@
 #define DBUS_SERVICE_PATH "/org/freedesktop/login1"
 #define DBUS_INTERFACE "org.freedesktop.login1.Manager"
 
+#define DBUS_SCREENSAVER_SERVICE_NAME "org.freedesktop.ScreenSaver"
+#define DBUS_SCREENSAVER_SERVICE_PATH "/org/freedesktop/ScreenSaver"
+#define DBUS_SCREENSAVER_INTERFACE "org.freedesktop.ScreenSaver"
+
 /////////////////////////////////////////////////////////////////////////////////////////
 bool PowerComponentDBus::callPowerMethod(QString method)
 {
@@ -79,3 +83,77 @@ bool PowerComponentDBus::isPowerMethodAvailable(QString method)
 
   return false;
 }
+
+void PowerComponentDBus::doDisableScreensaver()
+{
+  if (screensaver_inhibit_cookie)
+  {
+    QLOG_INFO() << "doDisableScreensaver : already disabled.";
+    return;
+  }
+  if (QDBusConnection::systemBus().isConnected())
+  {
+    QDBusInterface iface(DBUS_SCREENSAVER_SERVICE_NAME, DBUS_SCREENSAVER_SERVICE_PATH,
+                         DBUS_SCREENSAVER_INTERFACE, QDBusConnection::sessionBus());
+    if (iface.isValid())
+    {
+      QDBusReply<unsigned int> reply = iface.call("Inhibit", "plexmediaplayer", "playing");
+
+      if (reply.isValid())
+      {
+        screensaver_inhibit_cookie = reply.value();
+      }
+      else
+      {
+        QLOG_ERROR() << "doDisableScreensaver : Error while calling UnInhibit:"
+                     << reply.error().message();
+      }
+    }
+    else
+    {
+      QLOG_ERROR() << "doDisableScreensaver : failed to retrieve interface.";
+    }
+  }
+  else
+  {
+    QLOG_ERROR() << "doDisableScreensaver : could not find system bus";
+  }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+void PowerComponentDBus::doEnableScreensaver()
+{
+  if (!screensaver_inhibit_cookie)
+  {
+    QLOG_INFO() << "doEnableScreensaver : already enabled.";
+    return;
+  }
+  if (QDBusConnection::systemBus().isConnected())
+  {
+    QDBusInterface iface(DBUS_SCREENSAVER_SERVICE_NAME, DBUS_SCREENSAVER_SERVICE_PATH,
+                         DBUS_SCREENSAVER_INTERFACE, QDBusConnection::sessionBus());
+    if (iface.isValid())
+    {
+      QDBusReply<void> reply = iface.call("UnInhibit", screensaver_inhibit_cookie);
+
+      if (reply.isValid())
+      {
+        screensaver_inhibit_cookie = 0;
+      }
+      else
+      {
+        QLOG_ERROR() << "doEnableScreensaver : Error while calling UnInhibit:"
+                     << reply.error().message();
+      } 
+    }
+    else
+    {
+      QLOG_ERROR() << "doEnableScreensaver : failed to retrieve interface.";
+    }
+  }
+  else
+  {
+    QLOG_ERROR() << "doEnableScreensaver : could not find system bus";
+  }
+}
+

src/power/PowerComponentDBus.h

@@ -30,6 +30,12 @@ class PowerComponentDBus : public PowerComponent
   private:
     bool callPowerMethod(QString method);
     bool isPowerMethodAvailable(QString method);
+
+    unsigned int screensaver_inhibit_cookie = 0;
+  
+  protected:
+    virtual void doDisableScreensaver();
+    virtual void doEnableScreensaver();
 };
 
 #endif // POWERCOMPONENTDBUS_H