Hi,
The way I understand tweaks is that they are mutable effects to
> layouts/views.
>
That’s correct, although I would rather say “mutating effects”, as tweaks
themselves are immutable.
> In this case, is a ListAdapterTweak also a method to modify the display of
> the ListAdapeter? If so, where can I see what it actually does and how can
> I compose them?
>
listAdapterTweak returns a Tweak[AbsListView], which you can apply to any
AbsListView:
// create a tweak
val tweak = userListable.listAdapterTweak(User("Terry"), User("Graham"))
// myListView is a ListView slot
var myListView = slot[ListView]
// wire myListView to something...
runUi {
// apply the tweak
myListView <~ tweak
}
If you just want the adapter, there is also a listAdapter method, which
returns it:
val adapter = userListable.listAdapter(User("Terry"), User("Graham"))
runUi {
myListView <~ macroid.contrib.ListTweaks.adapter(adapter)
}
The second example is actually how listAdapterTweak is implemented
internally
:)
https://github.com/macroid/macroid-viewable/blob/master/src/main/scala/macroid/viewable/Listable.scala#L168
Hope this helps,
Nick
> On Thursday, July 31, 2014 6:41:36 PM UTC-4, Nick Stanchenko wrote:
>>
>> Hi,
>>
>> Here’s a new library I wrote under the *Macroid* umbrella project:
>> Macroid-Viewable: http://macroid.github.io/related/Viewable.html
>> It provides three main advantages:
>>
>> - A clear way to declare how your data should be displayed
>> - Boilerplate-free ListAdapters and PagerAdapters
>> - Macroid’s trademark emphasis on composability
>>
>> A quick example of displaying Alice and Bob in a list (with font size
>> proportional to their age):
>>
>> import macroid._
>> import macroid.FullDsl._
>> import macroid.viewable._
>>
>> // our data type
>> case class User(name: String, age: Int)
>>
>> // defines how to view a User in a list
>> implicit def userListable(implicit ctx: ActivityContext, appCtx:
>> AppContext) =
>> Listable[User].tw {
>> // the layout is a TextView
>> w[TextView]
>> } { user ⇒
>> // to display a user, we tweak the layout
>> text(user.name) + TextTweaks.size(user.age + 10)
>> }
>>
>> // now we simply tweak the ListView
>> myListView <~ List(User("Alice", 12), User("Bob", 23)).listAdapterTweak
>>
>> Please follow the link above for more documentation and cool features.
>> Also note that I’ve just submitted the library to the jCenter repo, but
>> until it arrives there, you might need to use the following resolver:
>>
>> resolvers += "stanch@Bintray" at "http://dl.bintray.com/stanch/maven/";
>>
>> Looking forward to hearing your feedback,
>> Nick
>>
>>
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