Only provide a register extension function for SingleListener

src/main/kotlin/net/axay/kspigot/event/Listeners.kt

@@ -7,11 +7,6 @@ import org.bukkit.event.EventPriority
 import org.bukkit.event.HandlerList
 import org.bukkit.event.Listener
 
-/**
- * Shortcut for registering this listener on the given plugin.
- */
-fun Listener.register() = pluginManager.registerEvents(this, KSpigotMainInstance)
-
 /**
  * Shortcut for unregistering all events in this listener.
  */
@@ -37,8 +32,11 @@ inline fun <reified T : Event> Listener.register(
  * This class represents a [Listener] with
  * only one event to listen to.
  */
-interface SingleListener<T : Event> : Listener {
-    fun onEvent(event: T)
+abstract class SingleListener<T : Event>(
+    val priority: EventPriority,
+    val ignoreCancelled: Boolean,
+) : Listener {
+    abstract fun onEvent(event: T)
 }
 
 /**
@@ -48,13 +46,15 @@ interface SingleListener<T : Event> : Listener {
  * @param priority the priority when multiple listeners handle this event
  * @param ignoreCancelled if manual cancellation should be ignored
  */
-inline fun <reified T : Event> SingleListener<T>.register(
-    priority: EventPriority = EventPriority.NORMAL,
-    ignoreCancelled: Boolean = false,
-) {
-    register<T>(priority, ignoreCancelled) { _, event ->
-        (event as? T)?.let { this.onEvent(it) }
-    }
+inline fun <reified T : Event> SingleListener<T>.register() {
+    pluginManager.registerEvent(
+        T::class.java,
+        this,
+        priority,
+        { _, event -> (event as? T)?.let { this.onEvent(it) } },
+        KSpigotMainInstance,
+        ignoreCancelled
+    )
 }
 
 /**
@@ -70,9 +70,9 @@ inline fun <reified T : Event> listen(
     register: Boolean = true,
     crossinline onEvent: (event: T) -> Unit,
 ): SingleListener<T> {
-    val listener = object : SingleListener<T> {
+    val listener = object : SingleListener<T>(priority, ignoreCancelled) {
         override fun onEvent(event: T) = onEvent.invoke(event)
     }
-    if (register) listener.register(priority, ignoreCancelled)
+    if (register) listener.register()
     return listener
 }