/*
   Copyright (C) 2008 - 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_TOGGLE_BUTTON_HPP_INCLUDED
#define GUI_WIDGETS_TOGGLE_BUTTON_HPP_INCLUDED

#include "gui/widgets/control.hpp"
#include "gui/widgets/selectable.hpp"

namespace gui2
{

/**
 * Class for a toggle button.
 *
 * A toggle button is a button with two states 'up' and 'down' or 'selected' and
 * 'deselected'. When the mouse is pressed on it the state changes.
 */
class ttoggle_button : public tcontrol, public tselectable_
{
public:
	ttoggle_button();

	/***** ***** ***** ***** Inherited ***** ***** ***** *****/

	/** See @ref tcontrol::set_members. */
	void set_members(const string_map& data);

	/** See @ref tcontrol::set_active. */
	virtual void set_active(const bool active) OVERRIDE;

	/** See @ref tcontrol::get_active. */
	virtual bool get_active() const OVERRIDE;

	/** See @ref tcontrol::get_state. */
	virtual unsigned get_state() const OVERRIDE;

	/** Inherited from tcontrol. */
	void update_canvas();

	/** Inherited from tselectable_ */
	bool get_value() const
	{
		return state_ >= ENABLED_SELECTED;
	}

	/** Inherited from tselectable_ */
	void set_value(const bool selected);

	/***** ***** ***** setters / getters for members ***** ****** *****/

	void set_retval(const int retval);

	/** Inherited from tselectable_. */
	void set_callback_state_change(boost::function<void(twidget&)> callback)
	{
		callback_state_change_ = callback;
	}

	void set_icon_name(const std::string& icon_name)
	{
		icon_name_ = icon_name;
		update_canvas();
	}
	const std::string& icon_name() const
	{
		return icon_name_;
	}

private:
	/**
	 * Possible states of the widget.
	 *
	 * Note the order of the states must be the same as defined in settings.hpp.
	 * Also note the internals do assume the order for 'up' and 'down' to be the
	 * same and also that 'up' is before 'down'. 'up' has no suffix, 'down' has
	 * the SELECTED suffix.
	 */
	enum tstate {
		ENABLED,
		DISABLED,
		FOCUSSED,
		ENABLED_SELECTED,
		DISABLED_SELECTED,
		FOCUSSED_SELECTED,
		COUNT
	};

	void set_state(const tstate state);

	/**
	 * Current state of the widget.
	 *
	 * The state of the widget determines what to render and how the widget
	 * reacts to certain 'events'.
	 */
	tstate state_;

	/**
	 * The return value of the button.
	 *
	 * If this value is not 0 and the button is double clicked it sets the
	 * retval of the window and the window closes itself.
	 */
	int retval_;

	/** See tselectable_::set_callback_state_change. */
	boost::function<void(twidget&)> callback_state_change_;

	/**
	 * The toggle button can contain an icon next to the text.
	 * Maybe this will move the the tcontrol class if deemed needed.
	 */
	std::string icon_name_;

	/** See @ref tcontrol::get_control_type. */
	virtual const std::string& get_control_type() const OVERRIDE;

	/***** ***** ***** signal handlers ***** ****** *****/

	void signal_handler_mouse_enter(const event::tevent event, bool& handled);

	void signal_handler_mouse_leave(const event::tevent event, bool& handled);

	void signal_handler_left_button_click(const event::tevent event,
										  bool& handled);

	void signal_handler_left_button_double_click(const event::tevent event,
												 bool& handled);
};

} // namespace gui2

#endif