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Patric Stout

Feature: framework to make savegames self-descriptive

We won't be able to make it fully self-descriptive (looking at you
MAP-chunks), but anything else can. With this framework, we can
add headers for each chunk explaining how each chunk looks like
in detail.

They also will all be tables, making it a lot easier to read in
external tooling, and opening the way to consider a database
(like SQLite) to use as savegame format.

Lastly, with the headers in the savegame, you can freely add
fields without needing a savegame version bump; older versions
of OpenTTD will simply ignore the new field. This also means
we can remove all the SLE_CONDNULL, as they are irrelevant.

The next few commits will start using this framework.

/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file settings_gui.h Functions for setting GUIs. */

#ifndef SETTING_GUI_H
#define SETTING_GUI_H

#include "gfx_type.h"
#include "widgets/dropdown_type.h"

/** Width of setting buttons */
#define SETTING_BUTTON_WIDTH  ((int)NWidgetScrollbar::GetHorizontalDimension().width * 2)
/** Height of setting buttons */
#define SETTING_BUTTON_HEIGHT ((int)NWidgetScrollbar::GetHorizontalDimension().height)

void DrawArrowButtons(int x, int y, Colours button_colour, byte state, bool clickable_left, bool clickable_right);
void DrawDropDownButton(int x, int y, Colours button_colour, bool state, bool clickable);
void DrawBoolButton(int x, int y, bool state, bool clickable);

DropDownList BuildMusicSetDropDownList(int *selected_index);

/* Actually implemented in music_gui.cpp */
void ChangeMusicSet(int index);

#endif /* SETTING_GUI_H */