/*
 * \brief  Nitpicker user state handling
 * \author Norman Feske
 * \date   2006-08-09
 *
 * This class comprehends the policy of user interaction.
 * It manages the toggling of Nitpicker's different modes
 * and routes input events to corresponding client sessions.
 */

/*
 * Copyright (C) 2006-2013 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU General Public License version 2.
 */

#ifndef _USER_STATE_H_
#define _USER_STATE_H_

#include "mode.h"
#include "view_stack.h"
#include "global_keys.h"

class User_state : public Mode, public View_stack
{
	private:

		/*
		 * Policy for the routing of global keys
		 */
		Global_keys &_global_keys;

		/*
		 * Current pointer position
		 */
		Point _pointer_pos;

		/*
		 * Currently pointed-at session
		 */
		Session *_pointed_session = nullptr;

		/*
		 * Session that receives the current stream of input events
		 */
		Session *_input_receiver = nullptr;

		void _update_all();

	public:

		/**
		 * Constructor
		 */
		User_state(Global_keys &, Area view_stack_size);

		/**
		 * Handle input event
		 *
		 * This function controls the Nitpicker mode and the user state
		 * variables.
		 */
		void handle_event(Input::Event ev);

		/**
		 * Accessors
		 */
		Point    pointer_pos()     { return _pointer_pos; }
		Session *pointed_session() { return _pointed_session; }


		/**
		 * (Re-)apply origin policy to all views
		 */
		void apply_origin_policy(View &pointer_origin)
		{
			View_stack::apply_origin_policy(pointer_origin);
		}

		/**
		 * Mode interface
		 */
		void forget(Session const &) override;
		void focused_session(Session *) override;
};

#endif