Add and remove sub elements at runtime

api.lua

@@ -1,6 +1,8 @@
 panel_lib.panels = {}       -- KEY: p_name; VALUE: {{"panel name" = panel}, {"panel name 2" = panel2}, ...}
 
 local function clone_table() end
+local function add_sub_elem() end
+local function remove_sub_elem() end
 
 Panel = {
     name = "",
@@ -94,33 +96,16 @@ function Panel:new(def)
     -- controllo sottoelementi
     if def.sub_img_elems then
       local i = 1
-      for name, elem in pairs(def.sub_img_elems) do
-        panel.sub_img_elems[i] = name
-        panel[name] = clone_table(panel.background_def)
-
-        for param, v in pairs(elem) do
-          panel[name][param] = v
-        end
-
-        -- mantengo la stessa posizione del corpo del panel, costringendo
-        -- l'utente a modificare gli offset se vuole spostare gli elementi
-        panel[name].position = def.position
+      for name, HUD_elem in pairs(def.sub_img_elems) do
+        add_sub_elem(panel, "image", name, HUD_elem)
         i = i +1
       end
     end
 
     if def.sub_txt_elems then
       local i = 1
-      for name, elem in pairs(def.sub_txt_elems) do
-        panel.sub_txt_elems[i] = name
-        panel[name] = clone_table(panel.title_def)
-
-        for param, v in pairs(elem) do
-          panel[name][param] = v
-        end
-
-        -- idem come sopra
-        panel[name].position = def.position
+      for name, HUD_elem in pairs(def.sub_txt_elems) do
+        add_sub_elem(panel, "text", name, HUD_elem)
         i = i +1
       end
     end
@@ -218,8 +203,30 @@ end
 
 
 function Panel:is_shown()
-  if self.is_shown then return true
-  else return false end
+  return self.is_shown
+end
+
+
+
+function Panel:add_sub_elem(type, name, HUD_elem)
+  add_sub_elem(self, type, name, HUD_elem)
+
+  -- aggiorno se visibile
+  if self.is_shown then
+    self:hide()
+    self:show()
+  end
+end
+
+
+
+function Panel:remove_sub_elem(name)
+  self.sub_txt_elems[name] = nil
+  self.sub_img_elems[name] = nil
+  self[name] = nil
+  if self.is_shown then
+    minetest.get_player_by_name(self.player_name):hud_remove(self.hud_id[name])
+  end
 end
 
 
@@ -257,3 +264,36 @@ function clone_table(orig)
     end
     return copy
 end
+
+
+
+function add_sub_elem(panel, type, name, HUD_elem)
+
+  local sub_elems
+  local mould
+
+  if type == "text" then
+    sub_elems = panel.sub_txt_elems
+    mould = panel.title_def
+  elseif type == "image" then
+    sub_elems = panel.sub_img_elems
+    mould = panel.background_def
+  else
+    error("[PANEL_LIB] type must be either 'text' or 'image'!")
+  end
+
+  if panel[name] then
+    minetest.log("error", "[PANEL_LIB] Attempt to create a sub element with the same name of another. Aborting")
+  return end
+
+  sub_elems[#sub_elems +1] = name
+  panel[name] = clone_table(mould)
+
+  for k, v in pairs(HUD_elem) do
+    panel[name][k] = v
+  end
+
+  -- mantengo la stessa posizione del corpo del panel, costringendo
+  -- l'utente a modificare gli offset se vuole spostare gli elementi
+  panel[name].position = mould.position
+end

init.lua

@@ -1,5 +1,5 @@
 panel_lib = {}
-local version = "2.0.0-dev"
+local version = "2.1.0-dev"
 
 dofile(minetest.get_modpath("panel_lib") .. "/api.lua")