From b9b17e5fc652cb02f8f21e1899b2f19f3510f36c Mon Sep 17 00:00:00 2001
From: Nikita Gazarov <nikita@raquo.com>
Date: Sat, 25 Nov 2023 00:59:36 +0100
Subject: [PATCH] New: `apply` alias for `compose` event processor

---
 .../com/raquo/laminar/keys/EventProcessor.scala    | 14 ++++++++++++++
 src/test/scala/com/raquo/laminar/SyntaxSpec.scala  | 10 ++++++++++
 2 files changed, 24 insertions(+)

diff --git a/src/main/scala/com/raquo/laminar/keys/EventProcessor.scala b/src/main/scala/com/raquo/laminar/keys/EventProcessor.scala
index 68f782de..0218c630 100644
--- a/src/main/scala/com/raquo/laminar/keys/EventProcessor.scala
+++ b/src/main/scala/com/raquo/laminar/keys/EventProcessor.scala
@@ -221,7 +221,14 @@ class EventProcessor[Ev <: dom.Event, V](
     *
     *     a(onClick.preventDefault.compose(_.delay(100)) --> observer)
     *
+    * Note: can also use with more compact `apply` alias:
+    *
+    *     div(onScroll(_.throttle(100)) --> observer)
+    *
+    *     a(onClick.preventDefault(_.delay(100)) --> observer)
+    *
     * Note: This method is not chainable. Put all the operations you need inside the `operator` callback.
+    *
     */
   def compose[Out](
     operator: EventStream[V] => Observable[Out]
@@ -229,6 +236,13 @@ class EventProcessor[Ev <: dom.Event, V](
     new LockedEventKey(this, operator)
   }
 
+  /** Alias for [[compose]] */
+  @inline def apply[Out](
+    composer: EventStream[V] => Observable[Out]
+  ): LockedEventKey[Ev, V, Out] = {
+    compose(composer)
+  }
+
   /** Similar to the Airstream `flatMap` operator.
     *
     * Use this when you want to create a new stream or signal on every event, e.g.:
diff --git a/src/test/scala/com/raquo/laminar/SyntaxSpec.scala b/src/test/scala/com/raquo/laminar/SyntaxSpec.scala
index 151b8d06..5ef36093 100644
--- a/src/test/scala/com/raquo/laminar/SyntaxSpec.scala
+++ b/src/test/scala/com/raquo/laminar/SyntaxSpec.scala
@@ -609,4 +609,14 @@ class SyntaxSpec extends UnitSpec {
     assert(intVar.now() == 15)
   }
 
+  it("compose syntax") {
+    val eventObs = Observer.empty[dom.Event]
+    div(
+      onClick.compose(_.delay(100)) --> eventObs,
+      onClick(_.delay(100)) --> eventObs,
+      //
+      onClick.preventDefault.compose(_.delay(100)) --> eventObs,
+      onClick.preventDefault(_.delay(100)) --> eventObs,
+    )
+  }
 }