wrapping C++ classes with Lua

gistfile1.lua

-- ============ Create new class
SpecialEdit = {}
setmetatable(SpecialEdit, mimas.LineEdit_mt)

-- calling SpecialEdit() should do the following things
-- 1. create userdata
-- 2. set new table as uservale                 ---> self
-- 3. create new lua thread and install "self" on the stack
-- 4. set access to userdata from self          ---> self.super = userdata
-- 5. set "SpecialEdit" as metatable for "self" ---> setmetatable(self, SpecialEdit)
-- 6. return "self"


-- This is a callback called from the C side. The call goes as follows
-- 1. the object's lua_thread's stack contains "self", ready to be used.
-- 2. call self.textChanged(self, text)
function SpecialEdit:textChanged(text)
  -- just to show that self is accessed by the callback with custom values ("owner").
  self.owner:doSomething()

  -- call a native method
  -- "hide" is found in mimas.LineEdit_mt       ---> LineEdit_mt.hide(self)
  -- the userdata is found in self              ---> LineEdit *c_obj = self.super    // C pseudo-code
  -- call the class method                      ---> c_obj->hide()
  self:hide(nil)
end