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/*
-----------------------------------------------------------------------------
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>
#  undef NOMINMAX
#  define NOMINMAX // required to stop windows.h screwing up std::min definition
#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);
#elif OGRE_PLATFORM == OGRE_PLATFORM_APPLE && !defined __OBJC__
        //! Internal UPP Window Handler (RenderWindow's use this when creating the OS X Carbon Window
        static OSStatus _CarbonWindowHandler(EventHandlerCallRef nextHandler, EventRef event, void* wnd);
#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
OgreWindowEventUtilities.h
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