toolkit/scroll_buttons.c

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/************************************************************************
*            Atrinik, a Multiplayer Online Role Playing Game            *
*                                                                       *
*    Copyright (C) 2009-2011 Alex Tokar and Atrinik Development Team    *
*                                                                       *
* Fork from Daimonin (Massive Multiplayer Online Role Playing Game)     *
* and Crossfire (Multiplayer game for X-windows).                       *
*                                                                       *
* 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; 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 this program; if not, write to the Free Software           *
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.             *
*                                                                       *
* The author can be reached at admin@atrinik.org                        *
************************************************************************/

#include <global.h>

static void scroll_buttons_show_one(SDL_Surface *surface, int x, int y, int *pos, int max_pos, int advance, SDL_Rect *box)
{
    int state, mx, my;

    /* Draw the button's borders. */
    draw_frame(surface, box->x - 1, box->y - 1, box->w + 1, box->h + 1);

    state = SDL_GetMouseState(&mx, &my);

    /* Visual feedback so the user knows whether there is anything more
     * further up/down so they don't have to bother clicking the buttons
     * to find out. */
    if (*pos + MAX(-1, MIN(1, advance)) < 0 || *pos + MAX(-1, MIN(1, advance)) > max_pos)
    {
        SDL_FillRect(surface, box, SDL_MapRGB(surface->format, 123, 115, 115));
    }
    /* Mouse over the button? */
    else if (mx > x && mx < x + box->w && my > y && my < y + box->h)
    {
        /* Clicked? */
        if (state == SDL_BUTTON(SDL_BUTTON_LEFT))
        {
            /* Advance the position pointer. */
            *pos += advance;
            SDL_FillRect(surface, box, SDL_MapRGB(surface->format, 119, 106, 77));
        }
        else
        {
            SDL_FillRect(surface, box, SDL_MapRGB(surface->format, 147, 133, 103));
        }
    }
    else
    {
        SDL_FillRect(surface, box, SDL_MapRGB(surface->format, 181, 165, 132));
    }
}

void scroll_buttons_show(SDL_Surface *surface, int x, int y, int *pos, int max_pos, int advance, SDL_Rect *box)
{
    _BLTFX bltfx;

    bltfx.surface = surface;
    bltfx.flags = 0;
    bltfx.alpha = 0;

    box->h = 20;
    box->w = 20;

    /* Show each of the buttons, color them depending on the mouse's
     * status, and show the arrow's bitmap. */
    scroll_buttons_show_one(surface, x, y, pos, max_pos, -advance, box);
    sprite_blt(Bitmaps[BITMAP_ARROW_UP2], box->x + box->w / 2 - Bitmaps[BITMAP_ARROW_UP2]->bitmap->w / 2, box->y + box->h / 2 - Bitmaps[BITMAP_ARROW_UP2]->bitmap->h / 2, NULL, &bltfx);
    y += 30;
    box->y += 30;
    scroll_buttons_show_one(surface, x, y, pos, max_pos, -1, box);
    sprite_blt(Bitmaps[BITMAP_ARROW_UP], box->x + box->w / 2 - Bitmaps[BITMAP_ARROW_UP]->bitmap->w / 2, box->y + box->h / 2 - Bitmaps[BITMAP_ARROW_UP]->bitmap->h / 2, NULL, &bltfx);
    y += 30;
    box->y += 30;
    scroll_buttons_show_one(surface, x, y, pos, max_pos, 1, box);
    sprite_blt(Bitmaps[BITMAP_ARROW_DOWN], box->x + box->w / 2 - Bitmaps[BITMAP_ARROW_DOWN]->bitmap->w / 2, box->y + box->h / 2 - Bitmaps[BITMAP_ARROW_DOWN]->bitmap->h / 2, NULL, &bltfx);
    y += 30;
    box->y += 30;
    scroll_buttons_show_one(surface, x, y, pos, max_pos, advance, box);
    sprite_blt(Bitmaps[BITMAP_ARROW_DOWN2], box->x + box->w / 2 - Bitmaps[BITMAP_ARROW_DOWN2]->bitmap->w / 2, box->y + box->h / 2 - Bitmaps[BITMAP_ARROW_DOWN2]->bitmap->h / 2, NULL, &bltfx);

    /* Check out of bounds values. */
    if (*pos > max_pos)
    {
        *pos = max_pos;
    }

    if (*pos < 0)
    {
        *pos = 0;
    }
}