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

Copyright (c) 2000-2009 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __OgreWindowEventUtils_H__
#define __OgreWindowEventUtils_H__

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

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
#  define WIN32_LEAN_AND_MEAN
#  if !defined(NOMINMAX) && defined(_MSC_VER)
#	define NOMINMAX // required to stop windows.h messing up std::min
#  endif
#  include <windows.h>
#elif OGRE_PLATFORM == OGRE_PLATFORM_APPLE
#  include <Carbon/Carbon.h>
#endif



namespace Ogre
{
	/** \addtogroup Core
	*  @{
	*/
	/** \addtogroup RenderSystem
	*  @{
	*/
	/**
	@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)
                { (void)rw; }

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

		/**
		@Remarks
			Window is closing (Only triggered if user pressed the [X] button)
		@param rw
			The RenderWindow which created this events
		@return True will close the window(default).
		*/
		virtual bool windowClosing(RenderWindow* rw)
		{ (void)rw; return true; }

		/**
		@Remarks
			Window has been closed (Only triggered if user pressed the [X] button)
		@param rw
			The RenderWindow which created this events
		@note
			The window has not actually close yet when this event triggers. It's only closed after
			all windowClosed events are triggered. This allows apps to deinitialise properly if they
			have services that needs the window to exist when deinitialising.
		*/
		virtual void windowClosed(RenderWindow* rw)
                { (void)rw; }

		/**
		@Remarks
			Window has lost/gained focus
		@param rw
			The RenderWindow which created this events
		*/
		virtual void windowFocusChange(RenderWindow* rw)
                { (void)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 multimap<RenderWindow*, WindowEventListener*>::type WindowEventListeners;
		static WindowEventListeners _msListeners;

		typedef vector<RenderWindow*>::type Windows;
		static Windows _msWindows;
	};
	/** @} */
	/** @} */
}
#endif
