source: downloads/ogre/OgreMain/include/OgreWindowEventUtilities.h @ 45

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/
#ifndef __OgreWindowEventUtils_H__
#define __OgreWindowEventUtils_H__

#include "OgrePrerequisites.h"
#include "OgrePlatform.h"

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
#  define WIN32_LEAN_AND_MEAN
#  include <windows.h>
#endif

namespace Ogre
{
        /**
        @Remarks
                Callback class used to send out window events to client app
        */
        class _OgreExport WindowEventListener
        {
        public:
                virtual ~WindowEventListener() {};

                /**
                @Remarks
                        Window has moved position
                @param rw
                        The RenderWindow which created this events
                */
                virtual void windowMoved(RenderWindow* rw)   {}

                /**
                @Remarks
                        Window has resized
                @param rw
                        The RenderWindow which created this events
                */
                virtual void windowResized(RenderWindow* rw) {}

                /**
                @Remarks
                        Window has been closed
                @param rw
                        The RenderWindow which created this events
                */
                virtual void windowClosed(RenderWindow* rw)  {}

                /**
                @Remarks
                        Window has lost/gained focuw
                @param rw
                        The RenderWindow which created this events
                */
                virtual void windowFocusChange(RenderWindow* rw) {}
        };

        /**
        @Remarks
                Utility class to handle Window Events/Pumping/Messages
        */
        class _OgreExport WindowEventUtilities
        {
        public:
                /**
                @Remarks
                        Call this once per frame if not using Root:startRendering(). This will update all registered
                        RenderWindows (If using external Windows, you can optionally register those yourself)
                */
                static void messagePump();

                /**
                @Remarks
                        Add a listener to listen to renderwindow events (multiple listener's per renderwindow is fine)
                        The same listener can listen to multiple windows, as the Window Pointer is sent along with
                        any messages.
                @param window
                        The RenderWindow you are interested in monitoring
                @param listner
                        Your callback listener
                */
                static void addWindowEventListener( RenderWindow* window, WindowEventListener* listener );

                /**
                @Remarks
                        Remove previously added listener
                @param window
                        The RenderWindow you registered with
                @param listner
                        The listener registered
                */
                static void removeWindowEventListener( RenderWindow* window, WindowEventListener* listener );

                /**
                @Remarks
                        Called by RenderWindows upon creation for Ogre generated windows. You are free to add your
                        external windows here too if needed.
                @param window
                        The RenderWindow to monitor
                */
                static void _addRenderWindow(RenderWindow* window);

                /**
                @Remarks
                        Called by RenderWindows upon creation for Ogre generated windows. You are free to add your
                        external windows here too if needed.
                @param window
                        The RenderWindow to remove from list
                */
                static void _removeRenderWindow(RenderWindow* window);

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
                //! Internal winProc (RenderWindow's use this when creating the Win32 Window)
                static LRESULT CALLBACK _WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
#endif

                //These are public only so GLXProc can access them without adding Xlib headers header
                typedef std::multimap<RenderWindow*, WindowEventListener*> WindowEventListeners;
                static WindowEventListeners _msListeners;

                typedef std::vector<RenderWindow*> Windows;
                static Windows _msWindows;
        };
}
#endif