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#tornadofx
- e
edvin
10/07/2018, 9:27 PMWhat do you mean by "A Scope is an instance of subdata/subclass"? - a
amanda.hinchman-dominguez
10/07/2018, 9:27 PMI guess this is what I'm trying to understand from the documentation:Copy codeScopes provide a way to make a View or Controller unique to a smaller subset of instances in your application. - m
mattmoore
10/07/2018, 9:27 PMSo, Hi! I'm a newbie here who is interested in Kotlin. Don't know if I'm even on the right track, but is a scope effectively a subset of some category of models? - a
amanda.hinchman-dominguez
10/07/2018, 9:27 PMI think I'm having the toughest time understanding what a scope is - m
mattmoore
10/07/2018, 9:27 PMSo if I have a list of people: - e
edvin
10/07/2018, 9:28 PM@Matt Hi 🙂 A scope is used to "group" components together. Let me use my favorite example: - m
mattmoore
10/07/2018, 9:28 PMval chicagoansScope = people.filter { it.city == 'Chicago' } - e
edvin
10/07/2018, 9:29 PMA
displays customers. You double click a Customer in the TableView and wrap aCustomerList
around the selected customer and put it into a new scope. Then you open aCustomerModel
in the context of that new scope withCustomerEditor
and now thefind<CustomerEditor>(Scope(customerModel))
can access the customer model usingCustomerEditor
.val customer: CustomerModel by inject() - e
edvin
10/07/2018, 9:30 PMNow you can open as many
as you want, and as long as you create a new scope for each, they will only see the data you put into their scope, so that data is effectively local to them.CustomerEditors - e
edvin
10/07/2018, 9:31 PMThis is especially handy if the
is built up of for example five smaller UI elements, for exampleCustomerEditor
,CustomerAddressEditor
etc.CustomerContactsList - a
amanda.hinchman-dominguez
10/07/2018, 9:31 PMIt's the use case that I think I understand, you want to be able to share a subset of data between a group of components - e
edvin
10/07/2018, 9:31 PMThey will now easily get access to the right customer instance, without you having to pass it around. - e
edvin
10/07/2018, 9:31 PM@amanda.hinchman-dominguez exactly! - a
amanda.hinchman-dominguez
10/07/2018, 9:32 PMSorry, this is the part that I really need to clarify though hahaha - a
amanda.hinchman-dominguez
10/07/2018, 9:32 PMI get the use case - m
mattmoore
10/07/2018, 9:32 PMI think I understood about...none of that. Sorry 😞 - a
amanda.hinchman-dominguez
10/07/2018, 9:32 PMThe problem is, I don't think I get how that's not passing a scope around if you're overriding the default scope of a component with your own - m
mattmoore
10/07/2018, 9:32 PMI think I'm confused about how you're not passing the instance around? - e
edvin
10/07/2018, 9:32 PMMatt, haha 🙂 I think I have made some screencasts about this, let me check. If not I'll make one tomorrow. - m
mattmoore
10/07/2018, 9:32 PMCool! I'd love to check those out! - a
amanda.hinchman-dominguez
10/07/2018, 9:33 PMI guess we can view a scope as a way to create cohesive composition applied to UI elements? - e
edvin
10/07/2018, 9:33 PMMatt: Each
, likeComponent
,View
andFragment
, inherit whatever scope they were looked up in, so you normally don't need to mention the scope after looking up the "root" of your tree of elements.Controller - e
edvin
10/07/2018, 9:34 PM@amanda.hinchman-dominguez Yes, that's one (and the most common) use for them, but they can be used for so much more. That's a good way to start thinking about them though. - m
mattmoore
10/07/2018, 9:34 PMIs a scope a kind of "context"?👍 1😮 1 - e
edvin
10/07/2018, 9:34 PMYes 🙂 - a
amanda.hinchman-dominguez
10/07/2018, 9:35 PMohhhhhhh - OKAY - a
amanda.hinchman-dominguez
10/07/2018, 9:35 PMSo 1) I'm going to try and figure out what I did wrong with this understanding and 2) I would love to draw a diagram to contribute to the scope stuff - e
edvin
10/07/2018, 9:36 PM@amanda.hinchman-dominguez That would be perfect 🙂 - m
mattmoore
10/07/2018, 9:36 PMOK! I think I was confusing the word "scope" in this context with Ruby's ActiveRecord "scopes". - a
amanda.hinchman-dominguez
10/07/2018, 9:37 PM1) I created a scope. What I did was incorrect because when you said I was passing a property, the collection I was trying to pass was a property, which scope does not accept because it is not an instance of a subset