Android MVVM framework write in kotlin, develop Android has never been so fun.
Switch branches/tags
Clone or download
Latest commit 450b33e May 19, 2017

README.md

KBinding

中文版

Android MVVM framework write in kotlin, base on anko, simple but powerful. It depends on my another project AutoAdapter(A library for simplifying adapter creation)

Contents

BindingMode

  • 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() {
    @delegate:Property
    var name: String by Delegates.property("Jason")
    
    // all the parameter for Command is optional, first parameter pass by event Observable, second parameter is lambda (Boolean) -> Unit
    @Command
    val hello(canExecute: (Boolean) -> Unit) {
        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() {
    @delegate:Property
    var name: String by Delegates.property("xxx@xxxx.co")
    
    @delegate:Property
    var password: String by Delegates.property("xxxxxx")
    
    @Command
    val login() {
        //login processing
    }
}

DependencyProperty and ExtractProperty

// @DependencyProperty will generate binding for nameAndSymbol depends on stock, stock changes then nameAndSymbol changes
// @ExtractProperty will generate binding for stock properties, for example code below, Property name and price will generated. If hasPrefix = true, then Property stock.name stock.price will generated.
class StockViewModel() : ViewModel() {
    @delegate:ExtractProperty(
        "name", "price",
        hasPrefix = false
    )
    var stock: Stock? by Delegates.property()
    
    @delegate:DependencyProperty("stock")
    var nameAndSymbol: String by Delegates.property { stock?.name + stock?.symbol }
}

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

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(paths, enabled(), false, converter) 
    
    //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(paths, text(), false, converter)
    fun TextView.text(vararg paths: String, mode: OneTime, converter: OneWayConverter<out CharSequence> = EmptyOneWayConverter()) : PropertyBinding = oneWayPropertyBinding(paths, text(), true, converter)
    fun TextView.text(path: String, mode: OneWayToSource, converter: OneWayConverter<*> = EmptyOneWayConverter<String>()) : PropertyBinding = oneWayPropertyBinding(path, textChanges2(), converter)
    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.library:kbinding:0.2.3'
    kapt 'com.benny.library:kbinding-compiler:0.2.3'
    
    // for common bindings, View, TextView, and ...
    compile 'com.benny.library:kbinding-common:0.2.3'
    // for recyclerview bindings
    compile 'com.benny.library:kbinding-adapterview:0.2.3'
    // for support v4 bindings
    compile 'com.benny.library:kbinding-support-v4:0.2.3'
}

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