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Kotterknife(ish) view binding for Conductor controllers
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// Largely borrowed from Jake Wharton's Kotterknife (https://github.com/JakeWharton/kotterknife) | |
// and paweljaneczek's PR for resetting cached views (https://github.com/JakeWharton/kotterknife/pull/37) | |
package com.bluelinelabs.conductor.butterknife | |
import android.view.View | |
import com.bluelinelabs.conductor.Controller | |
import java.util.Collections | |
import java.util.WeakHashMap | |
import kotlin.properties.ReadOnlyProperty | |
import kotlin.reflect.KProperty | |
object ViewBinder { | |
fun setup(target: Any, view: View) { | |
LiveBindings.register(target, view) | |
} | |
fun tearDown(target: Any) { | |
LiveBindings.reset(target) | |
} | |
} | |
public fun <V : View> Controller.bindView(id: Int) | |
: ReadOnlyProperty<Controller, V> = required(id, viewFinder) | |
public fun <V : View> Controller.bindOptionalView(id: Int) | |
: ReadOnlyProperty<Controller, V?> = optional(id, viewFinder) | |
public fun <V : View> Controller.bindViews(vararg ids: Int) | |
: ReadOnlyProperty<Controller, List<V>> = required(ids, viewFinder) | |
public fun <V : View> Controller.bindOptionalViews(vararg ids: Int) | |
: ReadOnlyProperty<Controller, List<V>> = optional(ids, viewFinder) | |
private val Controller.viewFinder: Controller.(Int) -> View? | |
get() = { LiveBindings.targetView(this)?.findViewById(it) } | |
private fun viewNotFound(id:Int, desc: KProperty<*>): Nothing = | |
throw IllegalStateException("View ID $id for '${desc.name}' not found.") | |
@Suppress("UNCHECKED_CAST") | |
private fun <T, V : View> required(id: Int, finder: T.(Int) -> View?) | |
= Lazy { t: T, desc -> t.finder(id) as V? ?: viewNotFound(id, desc) } | |
@Suppress("UNCHECKED_CAST") | |
private fun <T, V : View> optional(id: Int, finder: T.(Int) -> View?) | |
= Lazy { t: T, desc -> t.finder(id) as V? } | |
@Suppress("UNCHECKED_CAST") | |
private fun <T, V : View> required(ids: IntArray, finder: T.(Int) -> View?) | |
= Lazy { t: T, desc -> ids.map { t.finder(it) as V? ?: viewNotFound(it, desc) } } | |
@Suppress("UNCHECKED_CAST") | |
private fun <T, V : View> optional(ids: IntArray, finder: T.(Int) -> View?) | |
= Lazy { t: T, desc -> ids.map { t.finder(it) as V? }.filterNotNull() } | |
// Like Kotlin's lazy delegate but the initializer gets the target and metadata passed to it | |
private class Lazy<T, V>(private val initializer: (T, KProperty<*>) -> V) : ReadOnlyProperty<T, V> { | |
private object EMPTY | |
private var value: Any? = EMPTY | |
override fun getValue(thisRef: T, property: KProperty<*>): V { | |
LiveBindings.register(thisRef, this) | |
if (value == EMPTY) { | |
value = initializer(thisRef, property) | |
} | |
@Suppress("UNCHECKED_CAST") | |
return value as V | |
} | |
fun reset() { | |
value = EMPTY | |
} | |
} | |
private object LiveBindings { | |
private val viewMap = WeakHashMap<Any, View>() | |
private val bindingMap = WeakHashMap<Any, MutableCollection<Lazy<*, *>>>() | |
fun <T> targetView(target: T): View? { | |
return viewMap[target] | |
} | |
fun <T> register(target: T, view: View) { | |
viewMap.put(target, view) | |
} | |
fun <T> register(target: T, lazy: Lazy<T, *>) { | |
bindingMap.getOrPut(target, { Collections.newSetFromMap(WeakHashMap()) }).add(lazy) | |
} | |
fun <T> reset(target: T) { | |
viewMap.remove(target) | |
bindingMap[target]?.forEach { it.reset() } | |
} | |
} |
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package com.bluelinelabs.controller | |
import android.os.Bundle | |
import android.view.LayoutInflater | |
import android.view.View | |
import android.view.ViewGroup | |
import com.bluelinelabs.conductor.rxlifecycle.RxController | |
import com.bluelinelabs.conductor.butterknife.ViewBinder | |
abstract class ViewBindingController : RxController { | |
constructor() : super() | |
constructor(args: Bundle?) : super(args) | |
final override fun onCreateView(inflater: LayoutInflater, container: ViewGroup): View { | |
val view = inflateView(inflater, container) | |
ViewBinder.setup(this, view) | |
onBindView(view) | |
return view | |
} | |
abstract fun inflateView(inflater: LayoutInflater, container: ViewGroup): View | |
override fun onDestroyView(view: View?) { | |
ViewBinder.tearDown(this) | |
} | |
open fun onBindView(view: View) { } | |
} |
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