twocity · June 28, 2017 03:35 · Jun 28, 2017
diff --git a/BaseEpoxyHolder.kt b/BaseEpoxyHolder.kt
@@ -0,0 +1,29 @@
+abstract class BaseEpoxyHolder : EpoxyHolder() {
+  lateinit var itemView: View
+
+  final override fun bindView(view: View?) {
+    this.itemView = view!!
+    onBindView(itemView)
+  }
+
+  abstract fun onBindView(view: View)
+}
+
+fun <V : View> BaseEpoxyHolder.viewId(id: Int)
+    : ReadOnlyProperty<BaseEpoxyHolder, V> = Lazy { _, _ ->
+  this.itemView.findViewById(id) as V
+}
+
+private class Lazy<T, R>(private val initializer: (T, KProperty<*>) -> R) : ReadOnlyProperty<T, R> {
+  private object EMPTY
+
+  private var value: Any? = EMPTY
+
+  override fun getValue(thisRef: T, property: KProperty<*>): R {
+    if (value == EMPTY) {
+      value = initializer(thisRef, property)
+    }
+    return value as R
+  }
+
+}
diff --git a/ItemModelHolder.kt b/ItemModelHolder.kt
@@ -0,0 +1,8 @@
+ class ItemModelHolder : BaseEpoxyHolder() {
+    val draweeView: SimpleDraweeView by viewId(R.id.image_home_recommend_product)
+    val titleView: TextView by viewId(R.id.text_home_recommend_product_title)
+
+    override fun onBindView(view: View) {
+      draweeView.aspectRatio = 16.0f / 9.0f
+    }
+  }