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[code] Global callbacks (cool!)

 
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Durante



Joined: 02 Oct 2005
Posts: 65
Location: Austria
PostPosted: Mon Oct 31, 2005 5:01 am    Post subject: [code] Global callbacks (cool!) Reply with quote
I wanted to be able to make screenshots and do some debugging stuff from anywhere in my program without cluttering up my UI/game loop code, so I came up with this:

globalCallbacks.lua
Code:
---- An object implementing global key functions ----
-------------------------------------------------------------------------------

GlobalCallbacks = {
   funcs = {},
   ctrlread = Controls.read
}

function GlobalCallbacks:register(f)
   table.insert(self.funcs, f)
end

function GlobalCallbacks:remove(f)
   for i, v in pairs(self.funcs) do
      if v == f then
         table.remove(self.funcs, i)
      end
   end
end

function GlobalCallbacks:read()
   local ctrl = self.ctrlread()
   for _, v in pairs(self.funcs) do
      v(ctrl)
   end
   return ctrl
end

Controls.read = function()
   return GlobalCallbacks:read()
end


You use it like this:
Code:
dofile("src/globalcallbacks.lua")

GlobalCallbacks:register(function(ctrl)
   if ctrl:select() then
      screen:save("screenshot.png")
   end
end)


Simple, but effective. (i.e. with the above code you can now make a screenshot by pressing select, EVERYWHERE controls are read)

This is why I love dynamic languages.
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Durante



Joined: 02 Oct 2005
Posts: 65
Location: Austria
PostPosted: Mon Oct 31, 2005 10:04 am    Post subject: Reply with quote
Here's an improved version that allows you to use Controls.read normally in the handlers without causing a stack overflow ;)

Code:

---- An object implementing global key functions ----
-------------------------------------------------------------------------------

GlobalCallbacks = {
   funcs = {},
   ctrlread = Controls.read,
   fakeread = nil
}

function GlobalCallbacks:register(f)
   table.insert(self.funcs, f)
end

function GlobalCallbacks:remove(f)
   for i, v in pairs(self.funcs) do
      if v == f then
         table.remove(self.funcs, i)
      end
   end
end

function GlobalCallbacks:clear()
   self.funcs = {}
end

function GlobalCallbacks:read()
   local ctrl = self.ctrlread()
   Controls.read = self.ctrlread
   for _, v in pairs(self.funcs) do
      v(ctrl)
   end
   Controls.read = self.fakeread
   return ctrl
end

function GlobalCallbacks:cleanup()
   Controls.read = self.ctrlread
end

GlobalCallbacks.fakeread = function()
   return GlobalCallbacks:read()
end

Controls.read = GlobalCallbacks.fakeread


You should call GlobalCallbacks:cleanup() before exiting if you want your program to play nicely with other Lua stuff launched in the same session.
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chaos



Joined: 10 Apr 2005
Posts: 135
PostPosted: Mon Oct 31, 2005 2:40 pm    Post subject: Reply with quote
very nice idea..!
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