use callback methods in obs example

examples/obs/Gemfile

@@ -2,4 +2,4 @@
 
 source "https://rubygems.org"
 
-gem "obsws", "~> 0.3.0"
+gem "obsws", "~> 0.4.0"

examples/obs/main.rb

@@ -9,7 +9,10 @@ class Main
   def initialize(vm, **kwargs)
     @vm = vm
     @obsws = OBSWS::Events::Client.new(**kwargs)
-    @obsws.add_observer(self)
+    @obsws.register([
+      method(:on_current_program_scene_changed),
+      method(:on_exit_started)
+    ])
     @running = true
   end
 
@@ -17,6 +20,20 @@ class Main
     sleep(0.1) while running
   end
 
+  def on_current_program_scene_changed(data)
+    scene = data.scene_name
+    puts "Switched to scene #{scene}"
+    if respond_to?("on_#{scene.downcase}")
+      send("on_#{scene.downcase}")
+    end
+  end
+
+  def on_exit_started
+    puts "OBS closing!"
+    @obsws.close
+    @running = false
+  end
+
   def on_start
     @vm.strip[0].mute = true
     @vm.strip[1].B1 = true
@@ -40,27 +57,12 @@ class Main
   def on_end
     @vm.apply({"strip-0" => {mute: true}, "vban-instream-0" => {on: false}})
   end
-
-  def on_current_program_scene_changed(data)
-    scene = data.scene_name
-    puts "Switched to scene #{scene}"
-    if respond_to?("on_#{scene.downcase}")
-      send("on_#{scene.downcase}")
-    end
-  end
-
-  def on_exit_started
-    puts "OBS closing!"
-    @obsws.close
-    @running = false
-  end
 end
 
 def conn_from_yml
   YAML.load_file("config.yaml", symbolize_names: true)[:connection]
 end
 
-
 if $PROGRAM_NAME == __FILE__
   Voicemeeter::Remote.new(:potato).run do |vm|
     Main.new(vm, **conn_from_yml).run