Add 'btn' support to luavgl

lib/luavgl/src/lvgl.lua

@@ -335,6 +335,13 @@ end
 function lvgl.Object(parent, property)
 end
 
+--- Create Button widget on parent
+--- @param parent? Object | nil
+--- @param property? StyleProp
+--- @return Button
+function lvgl.Button(parent, property)
+end
+
 --- Create Calendar widget on parent
 --- @param parent? Object | nil
 --- @param property? StyleProp
@@ -342,7 +349,6 @@ end
 function lvgl.Calendar(parent, property)
 end
 
-
 ---
 --- Create Label on parent
 --- @param parent? Object | nil
@@ -465,6 +471,13 @@ obj = {}
 function obj:Object(property)
 end
 
+---
+--- Create button on object
+--- @param property? ButtonStyle
+--- @return Button
+function obj:Button(property)
+end
+
 ---
 --- Create calendar on object
 --- @param property? CalendarStyle
@@ -853,6 +866,18 @@ end
 function calendar:Dropdown(p)
 end
 
+---
+--- Button widget
+---@class Button:Object
+---
+local button = {}
+
+--- set method for button widget
+--- @param p ButtonStyle
+--- @return nil
+function button:set(p)
+end
+
 ---
 --- Checkbox widget
 ---@class Checkbox:Object
@@ -1350,6 +1375,8 @@ end
 --- @class LabelStyle :StyleProp
 --- @field text string
 
+--- Button style
+--- @class ButtonStyle :StyleProp
 
 --- Checkbox style
 --- @class CalendarStyle :StyleProp

lib/luavgl/src/widgets/btn.c

@@ -0,0 +1,53 @@
+#include "luavgl.h"
+#include "private.h"
+
+static int luavgl_btn_create(lua_State *L)
+{
+  return luavgl_obj_create_helper(L, lv_btn_create);
+}
+
+LUALIB_API int luavgl_btn_set_property_kv(lua_State *L, void *data)
+{
+  lv_obj_t *obj = data;
+  /* a base obj property? */
+  int ret = luavgl_obj_set_property_kv(L, obj);
+  if (ret != 0) {
+    debug("unkown property for btn.\n");
+  }
+
+  return ret;
+}
+
+static int luavgl_btn_set(lua_State *L)
+{
+  lv_obj_t *obj = luavgl_to_obj(L, 1);
+
+  if (!lua_istable(L, -1)) {
+    luaL_error(L, "expect a table on 2nd para.");
+    return 0;
+  }
+
+  luavgl_iterate(L, -1, luavgl_btn_set_property_kv, obj);
+
+  return 0;
+}
+
+static int luavgl_btn_tostring(lua_State *L)
+{
+  lv_obj_t *obj = luavgl_to_obj(L, 1);
+  lua_pushfstring(L, "lv_btn:%p", obj);
+  return 1;
+}
+
+static const luaL_Reg luavgl_btn_methods[] = {
+    {"set",             luavgl_btn_set            },
+    {NULL,              NULL                      },
+};
+
+static void luavgl_btn_init(lua_State *L)
+{
+  luavgl_obj_newmetatable(L, &lv_btn_class, "lv_btn", luavgl_btn_methods);
+  lua_pushcfunction(L, luavgl_btn_tostring);
+  lua_setfield(L, -2, "__tostring");
+  lua_pop(L, 1);
+}

lib/luavgl/src/widgets/widgets.c

@@ -1,6 +1,10 @@
 #include "luavgl.h"
 #include "private.h"
 
+#if LV_USE_BTN
+#include "btn.c"
+#endif
+
 #if LV_USE_CALENDAR
 #include "calendar.c"
 #endif
@@ -46,6 +50,10 @@ static int luavgl_obj_create(lua_State *L);
 static const luaL_Reg widget_create_methods[] = {
     {"Object",   luavgl_obj_create     },
 
+#if LV_USE_BTN
+    {"Button", luavgl_btn_create},
+#endif
+
 #if LV_USE_CALENDAR
     {"Calendar", luavgl_calendar_create},
 #endif
@@ -130,4 +138,8 @@ static void luavgl_widgets_init(lua_State *L)
   luavgl_dropdown_init(L);
 #endif
 
+#if LV_USE_BTN
+  luavgl_btn_init(L);
+#endif
+
 }