Script Only stacks
ambassador at fourthworld.com
Fri Feb 19 18:04:37 EST 2016
William Prothero wrote:
> I decided to check out script only stacks. I am in LC8 (DP14). I
> noticed that there is a sub-menu item in “New Stack”, at the bottom
> of the list, for a “Script Only” stack. Fine and dandy. It shows up
> in the Project Browser. But, when I click on the icon to the left of
> the stack entry (in the project browser), it opens and a card appears
> below it. I thought script only stacks had only the stack, not cards.
> So, is the Project Browser converting the stack to a regular stack?
A script-only stack is just that: a plain text file in which the first
...and below that is the stack's script. That's it. You can see
several examples throughout the IDE install.
When the engine reads a text file with that header using any normal
stack-access syntax (e.g. "open stack" or "start using") it instantiates
an actual stack object from it. And since a stack in LiveCode can't
exist without a card, the card comes along for the ride.
While it's in memory it behaves just like a LiveCode-native binary stack
- you can even set custom properties in it. Just be aware that
regardless what you do with it while it's in memory, the only thing that
will be saved in a script-only stack is, as the name implies, the script.
> Just wondering about script only stacks. I use a lot of substacks to
> hold various script resources, and it looks like there might be just
> a bit less overhead in script only stacks.
> BUT, can script only stacks be substacks?
No. A substack is part of the native binary stack structure of a normal
stack. As such, only other native binary stacks can be used as
substacks, and only in a native binary mainstack.
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