Implement cross-fade for story thumb shared element animation.

app/src/main/java/org/thoughtcrime/securesms/util/ActionRequestListener.kt

@@ -0,0 +1,32 @@
+package org.thoughtcrime.securesms.util
+
+import com.bumptech.glide.load.DataSource
+import com.bumptech.glide.load.engine.GlideException
+import com.bumptech.glide.request.RequestListener
+import com.bumptech.glide.request.target.Target
+
+/**
+ * Performs actions in onResourceReady and onLoadFailed
+ */
+class ActionRequestListener<T>(
+  private val onResourceReady: Runnable,
+  private val onLoadFailed: Runnable
+) : RequestListener<T> {
+
+  companion object {
+    @JvmStatic
+    fun <T> onEither(onEither: Runnable): ActionRequestListener<T> {
+      return ActionRequestListener(onEither, onEither)
+    }
+  }
+
+  override fun onLoadFailed(e: GlideException?, model: Any?, target: Target<T>?, isFirstResource: Boolean): Boolean {
+    onLoadFailed.run()
+    return false
+  }
+
+  override fun onResourceReady(resource: T, model: Any?, target: Target<T>?, dataSource: DataSource?, isFirstResource: Boolean): Boolean {
+    onResourceReady.run()
+    return false
+  }
+}