KBinding - 使用Kotlin实现的Android下的MVVM框架

项目地址:https://github.com/BennyWang/KBinding
 
KBinding
Android View Model binding framework write in kotlin, base on anko, simple but powerful.ContentsBindingMode
  • OneWay: Binding from model to view
  • TwoWay: Binding from model to view and view to model
  • OneWayToSource: Binding from view to model
  • OneTime: Binding from model to view, and auto release after first emit

 Simple Binding
verticalLayout {
editText {
bind { text("name", mode = TwoWay) }
}
button {
bind { click("hello") }
}
}
class SimpleViewModel() : ViewModel() {
var name: String by bindProperty("name") { "Jason" }
val hello: Command by bindCommand("hello") { params, canExecute ->
toast("Hello, ${name}!")
}
}
Multiple Binding
//login button enabled only when name and password not empty
class ArrayToBooleanConverter : MultipleConverter<Boolean> {
override fun convert(params: Array<Any>): Boolean {
params.forEach {
if(it.toString().isEmpty()) return false
}
return true
}
}
verticalLayout {
editText {
bind { text("name", mode = TwoWay) }
}
editText {
bind { text("password", mode = TwoWay) }
}
button {
bind { enabled("name", "password", mode = OneWay, converter = ArrayToBooleanConverter()
bind { click("login") }
}
}
class LoginViewModel() : ViewModel() {
var name: String by bindProperty("name") { "xxx@xxxx.com" }
var password: String by bindProperty("password") { "xxxxxx" }
val login: Command by bindCommand("login") { params, canExecute ->
//login processing
}
}
View Model property depends on other properties
//name and price property will be updated when new stock is set
class StockViewModel() : ViewModel() {
var stock: Stock? by bindProperty("stock")
val name: String? by bindProperty("name", "stock") { stock!!.name }
val price: Float by bindProperty("price", "stock") { stock!!.price }
}
Wait/Until
//wait/until just like OneTime binding, but it need apply action, for example below, it wait for market from model, then decide how to display
relativeLayout {
wait { until("market", converter = viewOfMarket) { inflate(it, this@verticalLayout) }
}
Extend Binding Property(Depend on RxBinding heavily)Event
    fun View.click(path: String) : PropertyBinding = commandBinding(path, clicks(), enabled())
Property
fun View.enabled(vararg paths: String, mode: OneWay = BindingMode.OneWay, converter: OneWayConverter<Boolean> = EmptyOneWayConverter()) : PropertyBinding = oneWayPropertyBinding(enabled(), false, converter, *paths)    


//this implements four binding mode for TextView, if just need OneWay mode, remove last three lines, some for other mode
fun TextView.text(vararg paths: String, mode: OneWay = BindingMode.OneWay, converter: OneWayConverter<out CharSequence> = EmptyOneWayConverter()) : PropertyBinding = oneWayPropertyBinding(text(), false, converter, *paths)
fun TextView.text(vararg paths: String, mode: OneTime, converter: OneWayConverter<out CharSequence> = EmptyOneWayConverter()) : PropertyBinding = oneWayPropertyBinding(text(), true, converter, *paths)
fun TextView.text(path: String, mode: OneWayToSource, converter: OneWayConverter<*> = EmptyOneWayConverter<String>()) : PropertyBinding = oneWayPropertyBinding(path, textChanges2(), convert)
fun TextView.text(path: String, mode: TwoWay, converter: TwoWayConverter<String, *> = EmptyTwoWayConverter<String, String>()) : PropertyBinding = twoWayPropertyBinding(path, textChanges2(), text(), converter)

Using with Gradle
dependencies {
compile 'com.benny.kbinding:library:0.1.0'
}
Contribute
Now is just the beginning of KBinding, so everyone interested in this library, just fork it and pull requests to me. Let's make it a little better.
 
Discussion
QQ Group: 516157585
 

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