    //------------------------------------------------------------------------------
    // emScreen.h
    //
    // Copyright (C) 2005-2011 Oliver Hamann.
    //
    // Homepage: http://eaglemode.sourceforge.net/
    //
    // This program is free software: you can redistribute it and/or modify it under
    // the terms of the GNU General Public License version 3 as published by the
    // Free Software Foundation.
    //
    // 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 version 3 for
    // more details.
    //
    // You should have received a copy of the GNU General Public License version 3
    // along with this program. If not, see <http://www.gnu.org/licenses/>.
    //------------------------------------------------------------------------------

    #ifndef emScreen_h
    #define emScreen_h

    #ifndef emModel_h
    #include <emCore/emModel.h>
    #endif

    class emWindow;
    class emWindowPort;

    //==============================================================================
    //================================== emScreen ==================================
    //==============================================================================

    class emScreen : public emModel {

    public:

            // This model class acts as an interface to the screen or desktop. It is
            // an abstract base class for an interface implementation. Such an
            // implementation should also define a public method like this:
            //
            //   static void Install(emContext & context);
            //
            // That method should find or create an instance of the interface
            // implementation within the given context, and it should call the
            // protected method Install for registering it as the interface to be
            // returned by LookupInherited. The main program or the emGUIFramework
            // implementation should call the public Install method on the root
            // context at program start.

            static emRef<emScreen> LookupInherited(emContext & context);
                    // Get a reference to the screen interface.
                    // Arguments:
                    //   context - The context where the screen interface has been
                    //             installed, or any descendant context. Typically,
                    //             it should have been installed in the root
                    //             context, so you can give any context here.
                    // Returns:
                    //   The reference to the interface, or a NULL reference if not
                    //   found.

            virtual double GetWidth() = 0;
            virtual double GetHeight() = 0;
                    // Get the resolution of the screen (or virtual desktop) in
                    // pixels.

            virtual void GetVisibleRect(double * pX, double * pY,
                                        double * pW, double * pH) = 0;
                    // Get the pixel coordinates of the visible rectangle of the
                    // screen. If it is not a virtual desktop, the result is equal
                    // to: 0.0, 0.0, GetWidth(), GetHeight()
                    // Arguments:
                    //   pX - Pointer for returning the X-position of the rectangle.
                    //   pY - Pointer for returning the Y-position of the rectangle.
                    //   pW - Pointer for returning the width of the rectangle.
                    //   pH - Pointer for returning the height of the rectangle.

            virtual double GetDPI() = 0;
                    // Get pixels per inch (horizontally).

            virtual void MoveMousePointer(double dx, double dy) = 0;
                    // Move the mouse pointer programmatically.
                    // Arguments:
                    //   dx - Amount of pixels to move the pointer in X direction.
                    //   dy - Amount of pixels to move the pointer in Y direction.

            virtual void Beep() = 0;
                    // Give an acoustic warning to the user, if possible.

            virtual void DisableScreensaver() = 0;
            virtual void EnableScreensaver() = 0;
                    // Disable or re-enable the screensaver. This should implement
                    // an internal counter for calls to DisableScreensaver() which
                    // have not yet been taken back by calls to EnableScreensaver().

            const emArray<emWindow*> & GetWindows();
                    // Get an array of pointers to all windows on the screen, which
                    // have been created within the context of this screen
                    // interface. Other windows are not included.

            const emSignal & GetWindowsSignal();
                    // This signal is signaled when the array returned by GetWindows
                    // has changed.

            void LeaveFullscreenModes(emWindow * exceptForWindow=NULL);
                    // Make sure that no window is in fullscreen mode, except for a
                    // given one, optionally. This concerns only windows that have
                    // been created within the context of this screen interface.

    protected:

            friend class emWindow;

            emScreen(emContext & context, const emString & name);
                    // See emModel.

            virtual ~emScreen();

            void Install();
                    // Register this interface so that it can be found by
                    // LookupInherited.

            virtual emWindowPort * CreateWindowPort(emWindow & window) = 0;
                    // Create a window port implementation for a new window on the
                    // screen. (This is called by the constructor of emWindow)

    private:
            emArray<emWindow*> Windows;
            emSignal WindowsSignal;
    };

    inline const emArray<emWindow*> & emScreen::GetWindows()
    {
            return Windows;
    }

    inline const emSignal & emScreen::GetWindowsSignal()
    {
            return WindowsSignal;
    }

    #endif