lecutre 07

lectures/07/counter/lib/counter_web/live/counter_live.ex

@@ -0,0 +1,40 @@
+defmodule CounterWeb.CounterLive do
+  use CounterWeb, :live_view
+  alias Phoenix.PubSub
+  @pubsub Counter.PubSub
+
+  def mount(_params, _session, socket) do
+	if connected?(socket), do: PubSub.subscribe(@pubsub, "counter")
+	counter = Counter.Worker.value()
+	{:ok, assign(socket, counter: counter)}
+  end
+
+  def render(assigns) do
+	~H"""
+	<section style="position: fixed; left: 50%; top: 50%; transform: translate(-50%, -50%);">
+		<h1>{@counter}</h1>
+		<div>
+			<.button phx-click="inc">INCREMENT</.button>
+			<.button phx-click="dec">DECREMENT</.button>
+		</div>
+	</section>
+	"""
+  end
+
+	def handle_event("dec", _payload, socket) do
+		Counter.Worker.dec()
+		PubSub.broadcast(@pubsub, "counter", :value_changed)
+		{:noreply, socket}
+	end
+
+	def handle_event("inc", _payload, socket) do
+		Counter.Worker.inc()
+		PubSub.broadcast(@pubsub, "counter", :value_changed)
+		{:noreply, socket}
+	end
+
+	def handle_info(:value_changed, socket) do
+		counter = Counter.Worker.value()
+		{:noreply, assign(socket, counter: counter)}
+	end
+end