On Feb 6, 2008, at 6:51 AM, Christiaan Hofman wrote:
So is this the proper way to implement what I want? If not what
can I do otherwise? I cannot think of any other way to do it. And
writing a custom 'add' command is quite a bit of work and seems
like duplication to me.
If your object model is not a strict hierarchy, but instead has
items which can either be freestanding or associated with multiple
containers (like playlists in iTunes, albums in iPhoto, etc.), then
add/remove is the correct way to solve this problem.
This is covered in the Scripting Interface Guidelines:
Thanks, I forgot about that. Too long ago I've looked at that.
If I would create my own add command, I have a few additional;
questions (after trying to implement it).
1. The TN says that if the "to" parameter is missing, it makes sense
to infer it from the target. That's actually a behavior that makes
sense for my app, so I can say
tell group 1
add foo 1
end tell
But I have no idea how to get the target out of the NSScriptCommand.
None of the accesors give it, and I also cannot see it in the -
appleEvent description. Even using private methods to interpret the
'subj' gives nothing.
2. If a script would try to add an item from another document to a
group from a document, there is a problem, because an item can be
contained in only a single document (the document is the default
container of an item). So like:
set aFoo to foo 1 of document 2
add aFoo to group 2
So just adding would lead to inconsistencies in my model. I could
find 2 ways to solve this: Refuse to do this, either by doing
nothing, or by raising an error. Or I could actually add a copy and
make sure the copy is added to the document (in this case to document
1). The first case makes sense because the user would also have the
'duplicate' command, which would be more appropriate. What would be
the proper way to handle this?
3. I'd like to have both the direct parameter and the "to" parameter
to have varying content. It makes sense for the "to" parameter to be
either a location specifier (NSPositionSpecifier) or a container
(like 'group 1'). So what should the type of it be? It seems to me
that making it a multiple type (like 'location specifier' or
'specifier') would lead AppleScript to confusions, as 'group 1' can
be interpreted both as a location specifier and as a container (I
want it to be a comtainer of course, but AppleScript cannot know
this). However if I type it as 'any' I have the problem that
AppleScript always gives a AppleEventDescriptor, and Apple has not
made their AppleEventDescriptor translation mechanism public (I
really hate that). So how should I type it to support both? There is
a similar problem for the direct parameter, as I also want to allow
some build-in types like files.
Thanks,
Christiaan
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