Milind,
You could also accomplish the same with a little less typing if you want:
module(...)
local _M = _M -- save the module table
then in your event handler function it's just setfenv(1, _M)
Mike
On 2/16/2012 4:42 PM, Milind Gupta wrote:
Hi Mike,
I agree a good practice is to declare things local, only for
things we want to access from outside unrestricted its easier not to
declare them local. So anyway what I ended up doing is having the
first statement in my event handler function as
setfenv(1,package.loaded[modname]) where modname is the name of the
module passed by lua to the module. Since require loads the module
function there so it just picks it up from there.
Thanks,
Milind
On Thu, Feb 16, 2012 at 12:06 PM, Mike Richards <mrichard...@gmx.com
<mailto:mrichard...@gmx.com>> wrote:
John and Milind,
function test() is declared in the current scope, and globally as
filterform.test
After fiddling around for a bit, it looks like
wx.wxEvtHandler:Connect saves upvalues, but not the current
function environment (scope), which was set in the call to module(...)
When the event function is called, the function environment is
reset to the global scope, so if you want to reference things you
declared in the module scope in the event callback, you have a
couple of options:
1. Declare everything as local, which to me is just good practice.
2. Use a fully qualified name (e.g. filterform.test())
3. Wrap all your calls to wx.wxEvtHandler:Connect like this:
function Connect(evthandler, id, func)
local environment = getfenv(1)
evthandler:Connect(id,
function(event)
setfenv(1, environment)
func(event)
end
)
end
[...]
local button = wx.Button([...])
Connect(button, wx.wxEVT_COMMAND_BUTTON_CLICKED, function(event) end)
John -- It seems like wx.wxEvtHandler:Connect should do this
anyways . . . that is, save the current function environment, and
then apply it before calling the callback.
Mike
On 2/16/2012 3:14 AM, Milind Gupta wrote:
Hello John,
Sorry for the carelessness. Here is a full set with
minimal.lua which is the main file to run and the module function
is called by the Help->About call back. That is true making test
a local function makes it work although I am not totally clear
why but if you press the other button 'Clear Task' it will give
an error complaining about filter which again is not declared
local. Actually declaring local anything in a module only makes
it private. Whether it is declared local or not it always resides
in the module environment. So even if test or filter are not
declared local they should be identified in the module
environment. Here is the Programming in Lua Modules and Packages
chapter that clarifies it:
http://www.inf.puc-rio.br/~roberto/pil2/chapter15.pdf
<http://www.inf.puc-rio.br/%7Eroberto/pil2/chapter15.pdf>
At least that is how I understood it. So I think it should work
without being declared local. In your previous email you said
that the environment is saved as an upvalue with the execution of
Connect. I am not sure how that would be done since the module
itself does not know what environment to Global it will be in.
Like if you see in minimal I placed it in the environment
newPackage and all my functions tables declared in the module
i.e. test, filter, etc. are in the table newPackage in the global
environment but the module code has no way of knowing that.
One last point is that unless its an event callback function
normal functions in the module run just fine whether test is
local or not. As an example I just added the test() call as the
first line in filterFormActivate which is a non event function so
when the Help-> About callback calls filterFormActivate, test()
just runs fine even though it is not local but now if you press
the Select Task button it will say it could not find test().
Milind
On Wed, Feb 15, 2012 at 3:14 AM, Milind Gupta <milind.gupta@...>
<mailto:milind.gupta@...> wrote:
> Hello John,
>
> thanks for the reply. Here is an example code that
does not work
Please try to provide enough code to make it run out of the box... I
had to add back GUI.initFrameH and rem out the usage of MainSizer to
make it even possible to run without error.
> (Pasted below and attached the file as well). A function from
the main wxlua
> application calls filterFormActivate which sets up a simple
frame with 2
> buttons and one static text and associates the button click to
SelTaskPress.
I made the help menu callback function of the minimal.wx.lua sample
call filterform.filterFormActivate(frame).
> But when the button is clicked the test() statement gives an
error. If that
> is removed then it cannot recognize the frame varaiable in the
> wx.wxFrame(frame line after test().
Please always include these errors in the future to help diagnose
the problem.
In order to solve your problem I made test() a local function so that
it will be an upvalue of the Connect() function that calls it. Note
that the 'frame' that is used in the SelTaskPress() function is the
frame from the minimal.wx.lua and not the frame from
filterFormActivate().
To be honest, I have not done too much with modules and require
in Lua
since I'm not sure I fully understand its behavior.
I just came across this which clears some things up for me. Note the
sentence "This means that any global functions are not visible by
default, which is why we had to create a local alias to print." This
is probably also why making test() local above fixed it. See also
package.seeall which might be useful to you.
http://www.luafaq.org/#T1.37
Hope this helps,
John
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