gecko/widget/xpwidgets/nsBaseScreen.h

96 lines
3.5 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Jones <jones.chris.g@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsBaseScreen_h
#define nsBaseScreen_h
#include "mozilla/Attributes.h"
#include "nsIScreen.h"
class nsBaseScreen : public nsIScreen
{
public:
nsBaseScreen();
virtual ~nsBaseScreen();
NS_DECL_ISUPPORTS
// nsIScreen interface
/**
* Simple management of screen brightness locks. This abstract base class
* allows all widget implementations to share brightness locking code.
*/
NS_IMETHOD LockMinimumBrightness(PRUint32 aBrightness);
NS_IMETHOD UnlockMinimumBrightness(PRUint32 aBrightness);
protected:
/**
* Manually set the current level of brightness locking. This is called after
* we determine, based on the current active locks, what the strongest
* lock is. You should normally not call this function - it will be
* called automatically by this class.
*
* Each widget implementation should implement this in a way that
* makes sense there. This is normally the only function that
* contains widget-specific code.
*
* The default implementation does nothing.
*
* @param aBrightness The current brightness level to set. If this is
* nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS
* (an impossible value for a brightness level to be),
* then that signifies that there is no current
* minimum brightness level, and the screen can shut off.
*/
virtual void ApplyMinimumBrightness(PRUint32 aBrightness) { }
private:
/**
* Checks what the minimum brightness value is, and calls
* ApplyMinimumBrightness.
*/
void CheckMinimumBrightness();
PRUint32 mBrightnessLocks[nsIScreen::BRIGHTNESS_LEVELS];
};
#endif // nsBaseScreen_h