1 files changed, 31 insertions, 0 deletions
diff --git a/lib/chessh/ssh/client/screen.ex b/lib/chessh/ssh/client/screen.ex
new file mode 100644
index 0000000..2dd9f9c
--- /dev/null
+++ b/lib/chessh/ssh/client/screen.ex
@@ -0,0 +1,31 @@
+defmodule Chessh.SSH.Client.Screen do
+  @callback handle_info(
+              {:render, width :: integer(), height :: integer()},
+              state :: any()
+            ) ::
+              {:noreply, any()}
+  @callback handle_info({:input, width :: integer(), height :: integer(), action :: any()}) ::
+              {:noreply, any()}
+
+  #  @callback render(state :: Chessh.SSH.Client.State.t() | any()) :: any()
+  #  @callback handle_input(action :: any(), state :: Chessh.SSH.Client.State.t()) ::
+  #              Chessh.SSH.Client.State.t()
+
+  defmacro __using__(_) do
+    quote do
+      @behaviour Chessh.SSH.Client.Screen
+      use GenServer
+
+      @ascii_chars Application.compile_env!(:chessh, :ascii_chars_json_file)
+                   |> File.read!()
+                   |> Jason.decode!()
+
+      def center_rect({rect_width, rect_height}, {parent_width, parent_height}) do
+        {
+          div(parent_height - rect_height, 2),
+          div(parent_width - rect_width, 2)
+        }
+      end
+    end
+  end
+end