From ef72b25660912ff247997089abfb93e9f0b52809 Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Thu, 7 Mar 2024 10:59:03 +1100
Subject: use prototype inheritance for lua screens, rather than functions

this gives us a way to give each screen nice little hooks, like
'onShown' and 'onHidden'. later we can use these hooks to disable
bindings for screens that aren't in-use.
---
 src/lua/lua_screen.cpp | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 src/lua/lua_screen.cpp

(limited to 'src/lua/lua_screen.cpp')

diff --git a/src/lua/lua_screen.cpp b/src/lua/lua_screen.cpp
new file mode 100644
index 00000000..27843bc7
--- /dev/null
+++ b/src/lua/lua_screen.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "lua_screen.hpp"
+
+#include <memory>
+#include <string>
+
+#include "lua.hpp"
+
+#include "esp_log.h"
+#include "lauxlib.h"
+#include "lua.h"
+#include "lvgl.h"
+
+#include "bridge.hpp"
+#include "database.hpp"
+#include "event_queue.hpp"
+#include "index.hpp"
+#include "property.hpp"
+#include "service_locator.hpp"
+#include "track.hpp"
+#include "track_queue.hpp"
+#include "ui_events.hpp"
+
+namespace lua {
+
+static auto screen_new(lua_State* L) -> int {
+  // o = o or {}
+  if (lua_gettop(L) != 2) {
+    lua_settop(L, 1);
+    lua_newtable(L);
+  }
+  // Swap o and self on the stack.
+  lua_insert(L, 1);
+
+  lua_pushliteral(L, "__index");
+  lua_pushvalue(L, 1);
+  lua_settable(L, 1);  // self.__index = self
+
+  lua_setmetatable(L, 1);  // setmetatable(o, self)
+
+  return 1;  // return o
+}
+
+static auto screen_noop(lua_State* state) -> int {
+  return 0;
+}
+
+static const struct luaL_Reg kScreenFuncs[] = {{"new", screen_new},
+                                               {"createUi", screen_noop},
+                                               {"onShown", screen_noop},
+                                               {"onHidden", screen_noop},
+                                               {NULL, NULL}};
+
+static auto lua_screen(lua_State* state) -> int {
+  luaL_newlib(state, kScreenFuncs);
+
+  lua_pushliteral(state, "__index");
+  lua_pushvalue(state, -2);
+  lua_rawset(state, -3);
+
+  return 1;
+}
+
+auto RegisterScreenModule(lua_State* s) -> void {
+  luaL_requiref(s, "screen", lua_screen, true);
+
+  lua_pop(s, 1);
+}
+
+}  // namespace lua
-- 
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