multi_lang rework: use separate arrays for each language

lv_core/lv_lang.h

@@ -0,0 +1,71 @@
+/**
+ * @file lv_lang.h
+ *
+ */
+
+#ifndef LV_LANG_H
+#define LV_LANG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#ifdef LV_CONF_INCLUDE_SIMPLE
+#include "lv_conf.h"
+#else
+#include "../../lv_conf.h"
+#endif
+
+#include <stdint.h>
+
+/*********************
+ *      DEFINES
+ *********************/
+#define LV_LANG_TXT_ID_NONE     0xFFFF /*Used to not assign any text IDs for a multi-language object.*/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Change the language
+ * @param lang_id the id of the
+ */
+void lv_lang_set(uint8_t lang_id);
+
+/**
+ * Set a function to get the texts of the set languages from a `txt_id`
+ * @param fp a function pointer to get the texts
+ */
+void lv_lang_set_text_func(void * (*fp)(uint16_t));
+
+/**
+ * Use the function set by `lv_lang_set_text_func` to get the `txt_id` text in the set language
+ * @param txt_id an ID of the text to get
+ * @return the `txt_id` txt on the set language
+ */
+void * lv_lang_get_text(uint16_t txt_id);
+
+/**
+ * Return with ID of the currently selected language
+ * @return pointer to the active screen object (loaded by 'lv_scr_load()')
+ */
+uint8_t lv_lang_act(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_LANG_H*/