Modularising Code

Dar Scott dsc at swcp.com
Thu May 8 16:32:44 EDT 2014


I remember there are cases where an infinite loop can occur but I don’t remember the details.

However, the message path crawl that I made does use pass and it does get to the back script that puts “bottom” into the message box.

Dar


On May 8, 2014, at 2:22 PM, Earthednet-wp <prothero at earthednet.org> wrote:

> Thanks for the reference to Richard's page! Excellent! It clarified some items I've had on my mind.
> 
> Btw, Dar's post suggests to me that one could create an infinite loop if there was a script in the substack that passed a message, then a script with the same name in the main stack also passed the message, then back to substack, ad infinitude. A reasonable scenario would be a mouseup handler.
> 
> Bill
> 
> William Prothero
> http://es.earthednet.org
> 
>> On May 8, 2014, at 12:10 PM, Peter Haworth <pete at lcsql.com> wrote:
>> 
>> I'd also recommend Richard Gaskin's excellent article on the subject which
>> can be found at
>> http://www.fourthworld.com/embassy/articles/revolution_message_path.html
>> 
>> Pete
>> lcSQL Software <http://www.lcsql.com>
>> Home of lcStackBrowser <http://www.lcsql.com/lcstackbrowser.html> and
>> SQLiteAdmin <http://www.lcsql.com/sqliteadmin.html>
>> 
>> 
>> On Thu, May 8, 2014 at 11:20 AM, Mike Kerner <MikeKerner at roadrunner.com>wrote:
>> 
>>> Terry,
>>> Definitely use substacks to modularize your code, BUT, I would suggest you
>>> do just a wee bit of reading on the message path, because it's important
>>> for everyone, and all of the questions you asked are discussed there:
>>> 1) In the LC toolbar at the top, the second-to right button is "Resources".
>>> Click it
>>> 2) The second link down is the "User Guide".  Click it
>>> 3) Inside there search for "message path".  There is a whole discussion of
>>> what it is and how to use it.
>>> 4) SEND and PASS and START USING STACK are your friends.
>>> 
>>> 
>>> 
>>> 
>>> On Thu, May 8, 2014 at 11:57 AM, Terence Heaford
>>> <t.heaford at btinternet.com>wrote:
>>> 
>>>> 
>>>> My understanding is if you create a library of a stack it’s stack script
>>>> is placed between the main stack that has called start using and
>>> LiveCode’s
>>>> engine.
>>>> 
>>>> Is that correct?
>>>> 
>>>> If yes then I presume if you start using a substack then the substack
>>>> script is placed between the main stack that has called start using and
>>>> LiveCode’s engine
>>>> 
>>>> Is that correct?
>>>> 
>>>> If you only have handlers in the stack script of the substack then any
>>>> messages will only call them after passing through the mainstacks script.
>>>> 
>>>> Is that correct?
>>>> 
>>>> If you actually use the substack as more than a repository for scripts
>>>> then any control will pass the message through the substacks script to
>>>> mainstack and onto the substack again.
>>>> 
>>>> Is that correct or once you start using the substack is it removed from
>>>> the normal message passing and any control only passes to the substack
>>>> script and onto the engine?
>>>> 
>>>> I hope the above is understandable.
>>>> 
>>>> All the best
>>>> 
>>>> Terry
>>>> 
>>>> 
>>>>> On 8 May 2014, at 14:37, Dar Scott <dsc at swcp.com> wrote:
>>>>> 
>>>>> Remember that the main stack is in the message path of the substack.
>>>> So, you will have the main stack twice in the message path for cards and
>>>> controls.  This is probably fine.  But, something like a keystroke
>>> counter
>>>> in the main stack might count them twice.
>>>> 
>>>> _______________________________________________
>>>> use-livecode mailing list
>>>> use-livecode at lists.runrev.com
>>>> Please visit this url to subscribe, unsubscribe and manage your
>>>> subscription preferences:
>>>> http://lists.runrev.com/mailman/listinfo/use-livecode
>>> 
>>> 
>>> 
>>> --
>>> On the first day, God created the heavens and the Earth
>>> On the second day, God created the oceans.
>>> On the third day, God put the animals on hold for a few hours,
>>>  and did a little diving.
>>> And God said, "This is good."
>>> _______________________________________________
>>> use-livecode mailing list
>>> use-livecode at lists.runrev.com
>>> Please visit this url to subscribe, unsubscribe and manage your
>>> subscription preferences:
>>> http://lists.runrev.com/mailman/listinfo/use-livecode
>> _______________________________________________
>> use-livecode mailing list
>> use-livecode at lists.runrev.com
>> Please visit this url to subscribe, unsubscribe and manage your subscription preferences:
>> http://lists.runrev.com/mailman/listinfo/use-livecode
> 
> _______________________________________________
> use-livecode mailing list
> use-livecode at lists.runrev.com
> Please visit this url to subscribe, unsubscribe and manage your subscription preferences:
> http://lists.runrev.com/mailman/listinfo/use-livecode





More information about the Use-livecode mailing list