rockbox/apps/menu.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 Robert E. Hak
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include <stdbool.h>
#include "lcd.h"
#include "menu.h"
#include "button.h"
#include "kernel.h"
#include "debug.h"

struct menu {
    int top;
    int cursor;
    struct menu_items* items;
    int itemcount;
};

#define MAX_MENUS 4

#ifdef HAVE_LCD_BITMAP
#define MENU_LINES 6
#else
#define MENU_LINES 2
#endif

static struct menu menus[MAX_MENUS];
static bool inuse[MAX_MENUS] = { false };

static void menu_draw(int m)
{
    int i = 0;

    lcd_clear_display();
#ifdef HAVE_LCD_BITMAP
    lcd_setmargins(0,0);
    lcd_setfont(0);
#endif
    for (i = menus[m].top; 
         (i < menus[m].itemcount) && (i<menus[m].top+MENU_LINES);
         i++) {
        lcd_puts(1, i-menus[m].top, menus[m].items[i].desc);
    }

	/* place the cursor */
    lcd_puts(0, menus[m].cursor - menus[m].top, "-");

    lcd_update();
}

/* 
 * Move the cursor to a particular id, 
 *   target: where you want it to be 
 */
static void put_cursor(int m, int target)
{
    bool do_update = true;

    lcd_puts(0, menus[m].cursor - menus[m].top, " ");    
    menus[m].cursor = target;

    if ( target < menus[m].top ) {
        menus[m].top--;
        menu_draw(m);
        do_update = false;
    }
    else if ( target-menus[m].top > MENU_LINES-1 ) {
        menus[m].top++;
        menu_draw(m);
        do_update = false;
    }

    if (do_update) {
        lcd_puts(0, menus[m].cursor - menus[m].top, "-"); 
        lcd_update();
    }

}

int menu_init(struct menu_items* mitems, int count)
{
    int i;

    for ( i=0; i<MAX_MENUS; i++ ) {
        if ( !inuse[i] ) {
            inuse[i] = true;
            break;
        }
    }
    if ( i == MAX_MENUS ) {
        DEBUGF("Out of menus!\n");
        return -1;
    }
    menus[i].items = mitems;
    menus[i].itemcount = count;
    menus[i].top = 0;
    menus[i].cursor = 0;

    return i;
}

void menu_exit(int m)
{
    inuse[m] = false;
}

void menu_run(int m)
{
    menu_draw(m);
    
    while(1) {
        switch( button_get(true) ) {
#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_UP:
#else
            case BUTTON_LEFT:
#endif
                if (menus[m].cursor) {
                    /* move up */
                    put_cursor(m, menus[m].cursor-1);
                }
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_DOWN:
#else
            case BUTTON_RIGHT:
#endif
                if (menus[m].cursor < menus[m].itemcount-1) {
                    /* move down */
                    put_cursor(m, menus[m].cursor+1);
                }
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_RIGHT:
#endif
            case BUTTON_PLAY:
                /* Erase current display state */
                lcd_clear_display();
            
                menus[m].items[menus[m].cursor].function();
            
                /* Return to previous display state */
                menu_draw(m);
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_LEFT:
#else
            case BUTTON_STOP:
            case BUTTON_MENU:
#endif
                return;

            default:
                break;
        }
        
        lcd_update();
    }
}