A little Levure-oriented question

[Graham Samuel]

But if there’s no code in the UI stack, how do the handlers in the SOS know what object has invoked them? I mean of course you can work out the caller, but it’s much easier to say

on mouseUp
doSomethingJustForMe(myCoordinates
end mouseUp

than working it all out later, isn’t it?

Doubtless this is a dumb question, but I told you I was confused.

Graham

> On 21 Feb 2018, at 18:59, Mike Kerner via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> You do not have to have a single line of code in the .rev/.livecode file.
> You can have behaviors assigned to each object, card, and the stack.  Those
> behaviors would be assigned to script-only stack files (.livecodescript).
> The first line of a SOS is the word "script", then a name, enclosed in
> quotes.  That name does not have to be related to anything, or have any
> meaning.  After that first line would be the code/handlers, etc.
> If you like, you can consolidate your code into only a few SOS's, or you
> can have an SOS as the behavior for every single object.
> 
> On Wed, Feb 21, 2018 at 11:46 AM, Graham Samuel via use-livecode <
> use-livecode at lists.runrev.com> wrote:
> 
>> OK, i’m a bit confused. If we look at a non-faceless application, then the
>> user will be interacting with it via the UI. This means that stuff like
>> clicking and dragging has to be dealt with. I see that this can all be done
>> by a library that works out where the ‘mouseUp’ or whatever came from and
>> then handles what is needed to be done and sent back to the user, but can
>> there really be no code at all in the stack the user sees? What about a
>> game-like interface, where the movement of objects relative to one another
>> is something that has to be captured? I suppose what I’m saying is that if
>> the essence of the app is the interaction between the objects the user
>> sees, then abstracting the objects’ behaviour away from the primary
>> interface only has the merit that it’s better for version control, doesn’t
>> it? Or am I seeing it all wrong?
>> 
>> Graham
>> 
>>> On 21 Feb 2018, at 01:04, Mike Kerner via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>>> 
>>> You can move as much or as little as you like.  I prefer to move
>> everything
>>> and use an external text editor whenever I want to edit code.  The .rev
>> or
>>> .livecode stack file for me, then has multiple cards with the layouts and
>>> the objects, but no code in it.  I also have taken to removing all
>>> substacks and making them separate, especially since in many cases those
>>> substacks are modules or libraries.  That makes version control of those
>>> submodules and libraries far simpler for me.
>>> 
>>> On Tue, Feb 20, 2018 at 6:43 PM, Trevor DeVore via use-livecode <
>>> use-livecode at lists.runrev.com> wrote:
>>> 
>>>> On Tue, Feb 20, 2018 at 5:15 PM, Graham Samuel via use-livecode <
>>>> use-livecode at lists.runrev.com> wrote:
>>>> 
>>>>> I’m following the Levure discussion and of course Trevor's
>> pronouncements
>>>>> with great interest. One thing strikes me - is there really a
>> universally
>>>>> understood meaning to the term “UI stack”? I do understand the concept
>> of
>>>>> separating the UI from the logic of an app, but any UI must contain
>>>>> **some** logic, mustn’t it? In the LC world, by ‘logic’ of course I
>>>> really
>>>>> mean code. What level of coding is permissible to allow in a UI stack,
>> do
>>>>> people think? I have a feeling that some folks’ idea of this is going
>> to
>>>> be
>>>>> very different from some others’. Perhaps there is an orthodoxy about
>>>> this,
>>>>> but I am not familiar with it.
>>>>> 
>>>> 
>>>> In Levure a UI stack is just a stack that is used as a window to
>> display a
>>>> user interface to the user. In LiveCode the term stack is overloaded. It
>>>> can be a library, a front script, a back script, or a stack that is
>>>> actually displays to the user. Actually it can be both a stack that
>>>> displays an interface to the user and a library/frontscript/
>> backscript).
>>>> So
>>>> Levure encourages you to organize your stacks based on how they are
>> used.
>>>> In Levure a UI stack will be added to the list of stackFiles property of
>>>> the main Levure app stack. This allows you to reference the stack by
>> name
>>>> (e.g. stack “MyStack”) without having to load all of the UI stacks into
>>>> memory when the application starts up.
>>>> 
>>>> My general rule is that I place all code that is specific to a specific
>> UI
>>>> stack in the behaviors attached to the stack, cards, and controls of
>> that
>>>> stack. Any code that is shared is pushed down into a library.
>>>> 
>>>> The controls in my stacks have very little code. They simply call
>> handlers
>>>> that reside in the card or stack behaviors.
>>>> 
>>>> --
>>>> Trevor DeVore
>>>> ScreenSteps
>>>> www.screensteps.com
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>>> 
>>> 
>>> 
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> 
> 
> 
> -- 
> 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:
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