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lua add menu callback

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forum user fprockboxer asked for a way to detect long presses within the
do_menu routine this adds that functionality

result = rb.do_menu("Title",t_items, start, menu_callback)

function menu_callback(action)
    ...
    return action
end

Change-Id: I110c590095a743a57d0a7d45b24309899a4629cf
This commit is contained in:
William Wilgus 2019-09-14 04:35:15 -05:00
parent f9225da811
commit 13245ebf76
1 changed files with 49 additions and 0 deletions
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49
apps/plugins/lua/rocklib.c
View file

@ -202,18 +202,60 @@ RB_WRAP(gui_syncyesno_run)
return 1;
}
static lua_State* store_luastate(lua_State *L, bool bStore)
{
/* it is dangerous to store the lua state byond its guaranteed lifetime
be sure to clear state asap (as in before you exit the calling function) */
static lua_State *LStored = NULL;
if(bStore)
LStored = L;
return LStored;
}
static int menu_callback(int action, const struct menu_item_ex *this_item)
{
(void) this_item;
static int lua_ref = LUA_NOREF;
lua_State *L = store_luastate(NULL, false);
if(!L)
{
lua_ref = action;
action = ACTION_STD_CANCEL;
}
else if (lua_ref != LUA_NOREF)
{
lua_rawgeti(L, LUA_REGISTRYINDEX, lua_ref);
lua_pushnumber(L, action);
lua_pcall (L, 1, 1, 0);
action = luaL_optnumber (L, -1, ACTION_STD_CANCEL);
lua_pop(L, 1);
}
return action;
}
RB_WRAP(do_menu)
{
struct menu_callback_with_desc menu_desc = {NULL, NULL, Icon_NOICON};
struct menu_item_ex menu = {MT_RETURN_ID | MENU_HAS_DESC, {.strings = NULL},
{.callback_and_desc = &menu_desc}};
int n, start_selected;
int ref_lua = LUA_NOREF;
const char **items, *title;
title = luaL_checkstring(L, 1);
start_selected = lua_tointeger(L, 3);
if (lua_isfunction (L, -1))
{
/*lua callback function cb(action) return action end */
ref_lua = luaL_ref(L, LUA_REGISTRYINDEX);
menu_callback(ref_lua, NULL);
store_luastate(L, true);
menu_desc.menu_callback = &menu_callback;
}
/* newuserdata will be pushed onto stack after args*/
items = get_table_items(L, 2, &n);
@ -223,6 +265,13 @@ RB_WRAP(do_menu)
int result = rb->do_menu(&menu, &start_selected, NULL, false);
if (ref_lua != LUA_NOREF)
{
store_luastate(NULL, true);
luaL_unref (L, LUA_REGISTRYINDEX, ref_lua);
menu_callback(LUA_NOREF, NULL);
}
lua_pushinteger(L, result);
return 1;
}