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49 lines
1.4 KiB
49 lines
1.4 KiB
-- Basic gui stuff by forum user "spk77": https://forum.cockos.com/showthread.php?t=161557
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------------- "class.lua" is copied from http://lua-users.org/wiki/SimpleLuaClasses -----------
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-- class.lua
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-- Compatible with Lua 5.1 (not 5.0).
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function class(base, init)
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local c = {} -- a new class instance
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if not init and type(base) == 'function' then
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init = base
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base = nil
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elseif type(base) == 'table' then
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-- our new class is a shallow copy of the base class!
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for i,v in pairs(base) do
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c[i] = v
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end
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c._base = base
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end
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-- the class will be the metatable for all its objects,
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-- and they will look up their methods in it.
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c.__index = c
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-- expose a constructor which can be called by <classname>(<args>)
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local mt = {}
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mt.__call = function(class_tbl, ...)
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local obj = {}
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setmetatable(obj,c)
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if init then
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init(obj,...)
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else
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-- make sure that any stuff from the base class is initialized!
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if base and base.init then
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base.init(obj, ...)
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end
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end
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return obj
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end
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c.init = init
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c.is_a = function(self, klass)
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local m = getmetatable(self)
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while m do
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if m == klass then return true end
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m = m._base
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end
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return false
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end
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setmetatable(c, mt)
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return c
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end
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----------------------------------------------------------------------------------------
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