Originally Posted by Lodur
Code:
CFP.TLW = CFP.BallAndChain(
WINDOW_MANAGER:CreateTopLevelWindow("CFP_BuffDisplay") )
-- Return T
-- Returns T, where T has the __index function on it's meta table built
:SetHidden(true)
-- step 1) lookup SetHidden via __index:
-- return function( self , ... )
-- tmp = T.__index(T, SetHidden) -- 1st anon function runs and returns the 2nd anon function
-- Step 2) invoke function call:
-- return self
-- :tmp(true) -- calls 2nd anon function which calls SetHidden on object and returns self (i.e. T)
:SetDimensions(w,h)
-- step 1) lookup SetDimensions via __index:
-- return function( self , ... )
-- tmp = T.__index(T, SetDimensions) -- 1st anon function runs and returns the 2nd anon function
-- Step 2) invoke function call:
-- return self
-- :tmp(w,h) -- calls 2nd anon function which calls SetDimensions on object and returns self (i.e. T)
.__BALL
-- step 1) lookup __BALL via __index:
-- if func == "__BALL" then return object end
-- 1st anon function string matches __BALL names and then returns object.
-- There is not invoke function call step as there are no parens after __BALL.
That is my understanding, at least... |
This explained what was going on perfectly.
The key step I was missing is that "return function (self, ...)" is returning that actual function to some temp variable in memory. So once that is returned we're still left with a function call to tmp().
So if my understanding is right, for the SetHidden call we'd end up with something that looked like:
T.tmp(T, true). Since the function "tmp"
IS defined for T (since it is explicitly defined right there in the call), tmp is executed...which calls Object.SetHidden(Object, true). It then returns "self" which T so the chain can continue. "Object" is the original window Object passed to the BallAndChain function
Does this sound right? If so, I think we've got the analysis of this tricky block of code down!!