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/*!
* Callback driven menu handler.
*
* The following is an implementation of a callback-driven menu system.
* It supports arbitrary levels of menus (limited by size of return stack)
* and supports arbitrary user events.
*
* Author Stuart Longland <[email protected]>
* Copyright (C) 2015 FreeDV project.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 2.1,
* as published by the Free Software Foundation. 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 Lesser General Public
* License along with this program; if not, see
* <http://www.gnu.org/licenses/>.
*/
#include "menu.h"
#include <stdlib.h>
/*!
* Return the Nth item on the stack.
*/
static const struct menu_stack_item_t* const menu_stack(
const struct menu_t* const menu,
uint8_t index)
{
if (menu->stack_depth <= index)
return NULL;
return &(menu->stack[menu->stack_depth - index - 1]);
}
/*!
* Return the Nth item on the stack.
*/
const struct menu_item_t* const menu_item(
const struct menu_t* const menu, uint8_t index)
{
const struct menu_stack_item_t* const current
= menu_stack(menu, index);
if (!current)
return NULL;
return current->item;
}
/*!
* Enter a (sub)-menu.
*/
int menu_enter(struct menu_t* const menu,
const struct menu_item_t* const item)
{
if (menu->stack_depth == MENU_STACK_SZ)
return -1;
menu->stack[menu->stack_depth].item = item;
menu->stack[menu->stack_depth].index = menu->current;
menu->stack_depth++;
(item->event_cb)(menu, MENU_EVT_ENTERED);
return 0;
}
/*!
* Return from a (sub)-menu.
*/
void menu_leave(struct menu_t* const menu)
{
if (!menu->stack_depth)
return; /* Already out of the menu */
menu->last = menu_item(menu, 0);
menu->stack_depth--;
const struct menu_stack_item_t* current = menu_stack(menu, 0);
if (current && current->item) {
menu->current = current->index;
(current->item->event_cb)(menu, MENU_EVT_RETURNED);
}
}
/*!
* Execute the callback for the current item with a user-supplied event.
*/
void menu_exec(struct menu_t* const menu, uint32_t event)
{
const struct menu_item_t* item = menu_item(menu, 0);
if (item && item->event_cb)
(item->event_cb)(menu, event);
}
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