Classes to keep screen lit

[chessclock] / classes / screenlitkeeper.cpp

diff --git a/classes/screenlitkeeper.cpp b/classes/screenlitkeeper.cpp
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+++ b/classes/screenlitkeeper.cpp
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+/**************************************************************************
+        ScreenLitKeeper
+
+        Copyright (C) 2010  Heli Hyvättinen
+        
+        This file 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.
+
+        This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+**************************************************************************/
+
+
+
+
+
+#include "screenlitkeeper.h"
+
+ScreenLitKeeper::ScreenLitKeeper(QObject *parent) :
+    QObject(parent)
+{
+    p_screensaver_ = NULL;
+    isKeptLit_ = false;
+}
+
+void ScreenLitKeeper::keepScreenLit(bool keepLit)
+{
+
+    //If the requested state is the same as the current state do nothing.
+    if (keepLit == isKeptLit_)
+        return;
+
+
+
+    if (keepLit == true )
+    {
+        //a new screensaver is created, parent is given so that it is automatically destroyed when this object is destroyed
+        p_screensaver_ = new QSystemScreenSaver(this);
+        //screensaver is disabled, which keeps the screen lit on N900
+        p_screensaver_->setScreenSaverInhibit();
+        isKeptLit_ = true;
+
+    }
+
+    else if (p_screensaver_ != NULL) //just to be on the safe side, it should never be NULL if this line is reached
+    {
+      delete p_screensaver_; //The object must be deleted to reverse the effect of setScreenSaverInhibit()
+      p_screensaver_ = NULL;
+      isKeptLit_ = false;
+
+    }
+
+    return;
+
+}