/*
   Copyright (C) 2009 - 2015 by Mark de Wever <koraq@xs4all.nl>
   Part of the Battle for Wesnoth Project http://www.wesnoth.org/

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU 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.

   See the COPYING file for more details.
*/

#ifndef GUI_WIDGETS_AUXILIARY_EVENT_HANDLER_HPP_INCLUDED
#define GUI_WIDGETS_AUXILIARY_EVENT_HANDLER_HPP_INCLUDED

#define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
#define BOOST_MPL_LIMIT_SET_SIZE 30

#include <boost/mpl/set.hpp>

#include <iosfwd>

namespace gui2
{

namespace event
{

class tdispatcher;

class tmanager
{
public:
	tmanager();
	~tmanager();
};

/**
 * The event send to the dispatcher.
 *
 * Events prefixed by SDL are (semi)-real SDL events. The handler does some
 * minor decoding like splitting the button down event to the proper event but
 * nothing more. Events without an SDL prefix are generated by another signal
 * eg the windows signal handler for SDL_MOUSE_MOTION can generate a
 * MOUSE_ENTER, MOUSE_MOTION and MOUSE_LEAVE event and send that to it's
 * children.
 *
 * @note When adding a new entry to the enum also add a unit test.
 */
enum tevent {
	DRAW /**< Periodic redraw request. */
	,
	CLOSE_WINDOW /**< A request to close the current window. */
	,
	SDL_VIDEO_RESIZE /**<
					  * A SDL resize request, coordinate is the
					  * new window size.
					  */
	,
	SDL_MOUSE_MOTION /**< A SDL mouse motion event. */
	,
	MOUSE_ENTER /**< A mouse enter event for a widget. */
	,
	MOUSE_MOTION /**< A mouse motion event for a widget. */
	,
	MOUSE_LEAVE /**< A mouse leave event for a widget. */
	,
	SDL_LEFT_BUTTON_DOWN /**< A SDL left mouse button down event. */
	,
	SDL_LEFT_BUTTON_UP /**< A SDL left mouse button up event. */
	,
	LEFT_BUTTON_DOWN /**<
					  * A left mouse button down event for a widget.
					  */
	,
	LEFT_BUTTON_UP /**<
					* A left mouse button up event for a widget.
					*/
	,
	LEFT_BUTTON_CLICK /**<
					   * A left mouse button click event for a
					   * widget.
					   */
	,
	LEFT_BUTTON_DOUBLE_CLICK /**<
							  * A left mouse button double click event for
							  * a widget.
							  */
	,
	SDL_MIDDLE_BUTTON_DOWN /**< A SDL middle mouse button down event. */
	,
	SDL_MIDDLE_BUTTON_UP /**< A SDL middle mouse button up event. */
	,
	MIDDLE_BUTTON_DOWN /**< See LEFT_BUTTON_DOWN. */
	,
	MIDDLE_BUTTON_UP /**< See LEFT_BUTTON_UP. */
	,
	MIDDLE_BUTTON_CLICK /**< See LEFT_BUTTON_CLICK. */
	,
	MIDDLE_BUTTON_DOUBLE_CLICK /**< See LEFT_BUTTON_DOUBLE_CLICK. */
	,
	SDL_RIGHT_BUTTON_DOWN /**< A SDL right mouse button down event. */
	,
	SDL_RIGHT_BUTTON_UP /**< A SDL right mouse button up event. */
	,
	RIGHT_BUTTON_DOWN /**< See LEFT_BUTTON_DOWN. */
	,
	RIGHT_BUTTON_UP /**< See LEFT_BUTTON_UP. */
	,
	RIGHT_BUTTON_CLICK /**< See LEFT_BUTTON_CLICK. */
	,
	RIGHT_BUTTON_DOUBLE_CLICK /**< See LEFT_BUTTON_DOUBLE_CLICK. */
	,
	SDL_WHEEL_LEFT /**< A SDL wheel left event. */
	,
	SDL_WHEEL_RIGHT /**< A SDL wheel right event. */
	,
	SDL_WHEEL_UP /**< A SDL wheel up event. */
	,
	SDL_WHEEL_DOWN /**< A SDL wheel down event. */
	,
	SDL_KEY_DOWN /**< A SDL key down event. */
	,
	NOTIFY_REMOVAL /**<
					* Send by a widget to notify others it's
					* being destroyed.
					*/
	,
	NOTIFY_MODIFIED /**<
					 * Send by a widget to notify others its
					 * contents or state are modified.
					 *
					 * What modified means is documented per
					 * widget. If not documented the modified
					 * means nothing.
					 */
	,
	RECEIVE_KEYBOARD_FOCUS /**< Widget gets keyboard focus. */
	,
	LOSE_KEYBOARD_FOCUS /**< Widget loses keyboard focus. */
	,
	SHOW_TOOLTIP /**<
				  * Request the widget to show its hover
				  * tooltip.
				  */
	,
	NOTIFY_REMOVE_TOOLTIP /**<
						   * Request the widget to show its hover
						   * tooltip.
						   */
	,
	SDL_ACTIVATE /**<
				  * The main application window is activated.
				  */
	,
	MESSAGE_SHOW_TOOLTIP /**<
						  * Request for somebody to show the tooltip
						  * based on the data send.
						  */
	,
	SHOW_HELPTIP /**<
				  * Request the widget to show its hover
				  * helptip.
				  */
	,
	MESSAGE_SHOW_HELPTIP /**<
						  * Request for somebody to show the helptip
						  * based on the data send.
						  */
	,
	REQUEST_PLACEMENT /**<
					   * Request for somebody to place the widget.
					   * This may also cause updating of more
					   * layout parts.
					   */
};

/**
 * Helper for catching use error of tdispatcher::connect_signal.
 *
 * This helper is needed as a user can't supply the wrong kind of callback
 * functions to tdispatcher::connect_signal. If a wrong callback would be send
 * it will never get called.
 *
 * This version is for callbacks without extra parameters.
 * NOTE some mouse functions like MOUSE_ENTER don't send the mouse coordinates
 * to the callback function so they are also in this category.
 */
typedef boost::mpl::set<boost::mpl::int_<DRAW>,
						boost::mpl::int_<CLOSE_WINDOW>,
						boost::mpl::int_<MOUSE_ENTER>,
						boost::mpl::int_<MOUSE_LEAVE>,
						boost::mpl::int_<LEFT_BUTTON_DOWN>,
						boost::mpl::int_<LEFT_BUTTON_UP>,
						boost::mpl::int_<LEFT_BUTTON_CLICK>,
						boost::mpl::int_<LEFT_BUTTON_DOUBLE_CLICK>,
						boost::mpl::int_<MIDDLE_BUTTON_DOWN>,
						boost::mpl::int_<MIDDLE_BUTTON_UP>,
						boost::mpl::int_<MIDDLE_BUTTON_CLICK>,
						boost::mpl::int_<MIDDLE_BUTTON_DOUBLE_CLICK>,
						boost::mpl::int_<RIGHT_BUTTON_DOWN>,
						boost::mpl::int_<RIGHT_BUTTON_UP>,
						boost::mpl::int_<RIGHT_BUTTON_CLICK>,
						boost::mpl::int_<RIGHT_BUTTON_DOUBLE_CLICK> >
tset_event;

/**
 * Helper for catching use error of tdispatcher::connect_signal.
 *
 * This version is for callbacks with a coordinate as extra parameter.
 */
typedef boost::mpl::set<boost::mpl::int_<SDL_VIDEO_RESIZE>,
						boost::mpl::int_<SDL_MOUSE_MOTION>,
						boost::mpl::int_<MOUSE_MOTION>,
						boost::mpl::int_<SDL_LEFT_BUTTON_DOWN>,
						boost::mpl::int_<SDL_LEFT_BUTTON_UP>,
						boost::mpl::int_<SDL_MIDDLE_BUTTON_DOWN>,
						boost::mpl::int_<SDL_MIDDLE_BUTTON_UP>,
						boost::mpl::int_<SDL_RIGHT_BUTTON_DOWN>,
						boost::mpl::int_<SDL_RIGHT_BUTTON_UP>,
						boost::mpl::int_<SHOW_TOOLTIP>,
						boost::mpl::int_<SHOW_HELPTIP>,
						boost::mpl::int_<SDL_WHEEL_UP>,
						boost::mpl::int_<SDL_WHEEL_DOWN>,
						boost::mpl::int_<SDL_WHEEL_LEFT>,
						boost::mpl::int_<SDL_WHEEL_RIGHT> > tset_event_mouse;

/**
 * Helper for catching use error of tdispatcher::connect_signal.
 *
 * This version is for callbacks with the keyboard values (these haven't been
 * determined yet).
 */
typedef boost::mpl::set<boost::mpl::int_<SDL_KEY_DOWN> > tset_event_keyboard;

/**
 * Helper for catching use error of tdispatcher::connect_signal.
 *
 * This version is for callbacks with a sender aka notification messages. Like
 *the
 * ones in tset_event it has no extra parameters, but this version is only
 * send to the target and not using the pre and post queue.
 */
typedef boost::mpl::set<boost::mpl::int_<NOTIFY_REMOVAL>,
						boost::mpl::int_<NOTIFY_MODIFIED>,
						boost::mpl::int_<RECEIVE_KEYBOARD_FOCUS>,
						boost::mpl::int_<LOSE_KEYBOARD_FOCUS>,
						boost::mpl::int_<NOTIFY_REMOVE_TOOLTIP>,
						boost::mpl::int_<SDL_ACTIVATE> >
tset_event_notification;

/**
 * Helper for catching use error of tdispatcher::connect_signal.
 *
 * This version is for callbacks with a sender aka notification messages.
 * Unlike the notifications this message is send through the chain. The event
 * is send from a widget all the way up to the window, who always is the
 * receiver of the message (unless somebody grabbed it before).
 */
typedef boost::mpl::set<boost::mpl::int_<MESSAGE_SHOW_TOOLTIP>,
						boost::mpl::int_<MESSAGE_SHOW_HELPTIP>,
						boost::mpl::int_<REQUEST_PLACEMENT> >
tset_event_message;

/**
 * Connects a dispatcher to the event handler.
 *
 * @param dispatcher              The dispatcher to connect.
 */
void connect_dispatcher(tdispatcher* dispatcher);

/**
 * Disconnects a dispatcher to the event handler.
 *
 * @param dispatcher              The dispatcher to disconnect.
 */
void disconnect_dispatcher(tdispatcher* dispatcher);

/**
 * Initializes the location of the mouse.
 *
 * After a layout of the window the mouse location needs to be updated to
 * test whether it entered or left a widget. Also after closing a window it's
 * needed to send a dummy mouse move.
 */
void init_mouse_location();

/**
 * Captures the mouse.
 *
 * A dispatcher can capture the mouse, when for example it's pressed on a
 * button, this means all mouse events after that are send to that widget.
 *
 * @param dispatcher              The dispatcher which should get the mouse
 *                                focus.
 */
void capture_mouse(tdispatcher* dispatcher);

/**
 * Releases a captured mouse.
 *
 * @param dispatcher              The dispatcher which should release the mouse
 *                                capture.
 */
void release_mouse(tdispatcher* dispatcher);

/**
 * Captures the keyboard.
 *
 * A dispatcher can capture the keyboard, when for example it's pressed on a
 * button, this means all keyboard events after that are send to that widget.
 *
 * @param dispatcher              The dispatcher which should get the keyboard
 *                                focus.
 */
void capture_keyboard(tdispatcher* dispatcher);

std::ostream& operator<<(std::ostream& stream, const tevent event);

} // namespace event

/**
 * Is a dialog open?
 *
 * @note added as backwards compatibility for gui::is_in_dialog.
 */
bool is_in_dialog();

} // namespace gui2

#endif