Support for inhibiting gnome screensaver.

Update issue #879
Gnome support done.

src/CMakeLists.txt

@@ -161,6 +161,7 @@ set(SOURCES
   ui/organisedialog.cpp
   ui/organiseerrordialog.cpp
   ui/qtsystemtrayicon.cpp
+  ui/screensaver.cpp
   ui/settingsdialog.cpp
   ui/systemtrayicon.cpp
 
@@ -569,6 +570,9 @@ if(NOT APPLE AND NOT WIN32)
   # DeviceKit lister source
   list(APPEND SOURCES devices/devicekitlister.cpp)
   list(APPEND HEADERS devices/devicekitlister.h)
+
+  # Gnome Screensaver DBus interface
+  list(APPEND SOURCES ui/gnomescreensaver.cpp)
 endif(NOT APPLE AND NOT WIN32)
 
 # Libgpod device backend

src/ui/gnomescreensaver.cpp

@@ -0,0 +1,19 @@
+#include "gnomescreensaver.h"
+
+#include <QCoreApplication>
+#include <QDBusInterface>
+#include <QDBusReply>
+
+void GnomeScreensaver::Inhibit() {
+  QDBusInterface gnome_screensaver("org.gnome.ScreenSaver", "/", "org.gnome.ScreenSaver");
+  QDBusReply<quint32> reply =
+      gnome_screensaver.call("Inhibit", QCoreApplication::applicationName(), QObject::tr("Visualizations"));
+  if (reply.isValid()) {
+    cookie_ = reply.value();
+  }
+}
+
+void GnomeScreensaver::Uninhibit() {
+  QDBusInterface gnome_screensaver("org.gnome.ScreenSaver", "/", "org.gnome.ScreenSaver");
+  gnome_screensaver.call("UnInhibit", cookie_);
+}

src/ui/gnomescreensaver.h

@@ -0,0 +1,17 @@
+#ifndef GNOMESCREENSAVER_H
+#define GNOMESCREENSAVER_H
+
+#include "screensaver.h"
+
+#include <QtGlobal>
+
+class GnomeScreensaver : public Screensaver {
+ public:
+  void Inhibit();
+  void Uninhibit();
+
+ private:
+  quint32 cookie_;
+};
+
+#endif

src/ui/screensaver.cpp

@@ -0,0 +1,21 @@
+#include "screensaver.h"
+
+#include "gnomescreensaver.h"
+
+#ifdef Q_WS_X11
+#include <QDBusConnection>
+#include <QDBusConnectionInterface>
+#endif
+
+Screensaver* Screensaver::screensaver_ = 0;
+
+Screensaver* Screensaver::GetScreensaver() {
+  if (!screensaver_) {
+    #ifdef Q_WS_X11
+    if (QDBusConnection::sessionBus().interface()->isServiceRegistered("org.gnome.ScreenSaver")) {
+      screensaver_ = new GnomeScreensaver();
+    }
+    #endif
+  }
+  return screensaver_;
+}

src/ui/screensaver.h

@@ -0,0 +1,15 @@
+#ifndef SCREENSAVER_H
+#define SCREENSAVER_H
+
+class Screensaver {
+ public:
+  virtual void Inhibit() = 0;
+  virtual void Uninhibit() = 0;
+
+  static Screensaver* GetScreensaver();
+
+ private:
+  static Screensaver* screensaver_;
+};
+
+#endif

src/visualisations/visualisationcontainer.cpp

@@ -21,6 +21,7 @@
 #include "visualisationselector.h"
 #include "engines/gstengine.h"
 #include "ui/iconloader.h"
+#include "ui/screensaver.h"
 
 #include <QHBoxLayout>
 #include <QSettings>
@@ -245,6 +246,10 @@ void VisualisationContainer::keyReleaseEvent(QKeyEvent *event) {
 
 void VisualisationContainer::ToggleFullscreen() {
   setWindowState(windowState() ^ Qt::WindowFullScreen);
+
+  Screensaver* screensaver = Screensaver::GetScreensaver();
+  if (screensaver)
+    isFullScreen() ? screensaver->Inhibit() : screensaver->Uninhibit();
 }
 
 void VisualisationContainer::SetFps(int fps) {