From e2107e9990187d7aec1f6244dab9e72855c8139e Mon Sep 17 00:00:00 2001
From: Denis Karmyshakov <Denis.Karmyshakov@gmail.com>
Date: Fri, 27 Apr 2018 14:02:29 +0300
Subject: [PATCH] Simple delegate for properties

---
 .../roboswag/components/extensions/Delegates.kt  | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 src/main/java/ru/touchin/roboswag/components/extensions/Delegates.kt

diff --git a/src/main/java/ru/touchin/roboswag/components/extensions/Delegates.kt b/src/main/java/ru/touchin/roboswag/components/extensions/Delegates.kt
new file mode 100644
index 0000000..c8e0538
--- /dev/null
+++ b/src/main/java/ru/touchin/roboswag/components/extensions/Delegates.kt
@@ -0,0 +1,16 @@
+package ru.touchin.roboswag.components.extensions
+
+import kotlin.properties.Delegates
+import kotlin.properties.ObservableProperty
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+/**
+ * Simple observable delegate only for notification of new value.
+ */
+inline fun <T> Delegates.observable(
+        initialValue: T,
+        crossinline onChange: (newValue: T) -> Unit
+): ReadWriteProperty<Any?, T> = object : ObservableProperty<T>(initialValue) {
+    override fun afterChange(property: KProperty<*>, oldValue: T, newValue: T) = onChange(newValue)
+}