Add support for inhibiting the screensaver on windows.

src/CMakeLists.txt

@@ -875,6 +875,7 @@ optional_source(WIN32
   SOURCES
     engines/directsounddevicefinder.cpp
     networkremote/tinysvcmdns.cpp
+    ui/windowsscreensaver.cpp
     widgets/osd_win.cpp
   INCLUDE_DIRECTORIES
     ${CMAKE_SOURCE_DIR}/3rdparty/tinysvcmdns

src/ui/screensaver.cpp

@@ -30,6 +30,10 @@
 #include "macscreensaver.h"
 #endif
 
+#ifdef Q_OS_WIN32
+#include "windowsscreensaver.h"
+#endif
+
 #include <QtDebug>
 
 const char* Screensaver::kGnomeService = "org.gnome.ScreenSaver";
@@ -54,6 +58,8 @@ Screensaver* Screensaver::GetScreensaver() {
     }
 #elif defined(Q_OS_DARWIN)
     screensaver_ = new MacScreensaver();
+#elif defined(Q_OS_WIN32)
+    screensaver_ = new WindowsScreensaver();
 #endif
   }
   return screensaver_;

src/ui/windowsscreensaver.cpp

@@ -0,0 +1,30 @@
+/* This file is part of Clementine.
+   Copyright 2015, John Maguire <john.maguire@gmail.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "windowsscreensaver.h"
+
+WindowsScreensaver::WindowsScreensaver() : previous_state_(0) {}
+
+void WindowsScreensaver::Inhibit() {
+  // TODO: use PowerCreateRequest on Win7+
+  previous_state_ =
+      SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED);
+}
+
+void WindowsScreensaver::Uninhibit() {
+  SetThreadExecutionState(ES_CONTINUOUS | previous_state_);
+}

src/ui/windowsscreensaver.h

@@ -0,0 +1,35 @@
+/* This file is part of Clementine.
+   Copyright 2015, John Maguire <john.maguire@gmail.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef WINDOWSSCREENSAVER_H
+#define WINDOWSSCREENSAVER_H
+
+#include "screensaver.h"
+
+#include <windows.h>
+
+class WindowsScreensaver : public Screensaver {
+ public:
+  WindowsScreensaver();
+
+  void Inhibit() override;
+  void Uninhibit() override;
+
+ private:
+  EXECUTION_STATE previous_state_;
+};
+
+#endif  // WINDOWSSCREENSAVER_H