widget: add option to expose widget API to global

Signed-off-by: Neo Xu <[email protected]>

CMakeLists.txt

@@ -7,11 +7,13 @@ option(LV_USE_LIBPNG "Use libpng to decode PNG" OFF)
 option(LV_USE_LIBJPEG_TURBO "Use libjpeg turbo to decode JPEG" OFF)
 option(LV_USE_FFMPEG "Use libffmpeg to display video using lv_ffmpeg" OFF)
 option(LV_USE_FREETYPE "Use freetype lib" OFF)
+option(EXPOSE_WIDGET_API "Expose widget create method to global" ON)
 
 add_compile_definitions($<$<BOOL:${LV_USE_DRAW_SDL}>:LV_USE_DRAW_SDL=1>)
 add_compile_definitions($<$<BOOL:${LV_USE_LIBPNG}>:LV_USE_LIBPNG=1>)
 add_compile_definitions($<$<BOOL:${LV_USE_LIBJPEG_TURBO}>:LV_USE_LIBJPEG_TURBO=1>)
 add_compile_definitions($<$<BOOL:${LV_USE_FFMPEG}>:LV_USE_FFMPEG=1>)
+add_compile_definitions($<$<BOOL:${EXPOSE_WIDGET_API}>:LUAVGL_EXPOSE_WIDGET_API=1>)
 
 find_program(CCACHE_FOUND ccache)
 if(CCACHE_FOUND)

src/luavgl.c

@@ -146,6 +146,18 @@ LUALIB_API int luaopen_lvgl(lua_State *L)
   luaL_getmetatable(L, "widgets");
   lua_setmetatable(L, -2);
 
+#ifdef LUAVGL_EXPOSE_WIDGET_API
+  const luaL_Reg *reg;
+  for (int i = 0; ;i++) {
+    reg = &widget_create_methods[i];
+    if (reg->name == NULL)
+      break;
+
+    lua_pushcfunction(L, reg->func);
+    lua_setglobal(L, reg->name);
+  }
+#endif
+
   (void)dumpstack;
   (void)dumptable;
   (void)dumpvalue;