chore: add LV_USE_PRIVATE_API (#6737)

Kconfig

@@ -711,6 +711,10 @@ menu "LVGL configuration"
 			bool "Enable matrix support"
 			default n
 			select LV_USE_FLOAT
+
+		config LV_USE_PRIVATE_API
+			bool "Include `lvgl_private.h` in `lvgl.h` to access internal data and functions by default"
+			default n
 	endmenu
 
 	menu "Font Usage"

lv_conf_template.h

@@ -448,6 +448,9 @@
  *Requires `LV_USE_FLOAT = 1`*/
 #define LV_USE_MATRIX           0
 
+/*Include `lvgl_private.h` in `lvgl.h` to access internal data and functions by default*/
+#define LV_USE_PRIVATE_API		0
+
 /*==================
  *   FONT USAGE
  *===================*/

lvgl.h

@@ -120,6 +120,10 @@ extern "C" {
 #include "src/lv_api_map_v9_0.h"
 #include "src/lv_api_map_v9_1.h"
 
+#if LV_USE_PRIVATE_API
+#include "src/lvgl_private.h"
+#endif
+
 /*********************
  *      DEFINES
  *********************/

src/lv_conf_internal.h

@@ -1313,6 +1313,15 @@
     #endif
 #endif
 
+/*Include `lvgl_private.h` in `lvgl.h` to access internal data and functions by default*/
+#ifndef LV_USE_PRIVATE_API
+    #ifdef CONFIG_LV_USE_PRIVATE_API
+        #define LV_USE_PRIVATE_API CONFIG_LV_USE_PRIVATE_API
+    #else
+        #define LV_USE_PRIVATE_API		0
+    #endif
+#endif
+
 /*==================
  *   FONT USAGE
  *===================*/