lv_kb: add Keyboard object type

lv_objx/lv_kb.h

+/**
+ * @file lv_kb.h
+ * 
+ */
+
+#ifndef LV_KB_H
+#define LV_KB_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_conf.h"
+#if USE_LV_KB != 0
+
+#include "../lv_obj/lv_obj.h"
+#include "lv_btnm.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+typedef enum {
+    LV_KB_MODE_TXT,
+    LV_KB_MODE_NUM,
+}lv_kb_mode_t;
+
+
+/*Data of keyboard*/
+typedef struct {
+    lv_btnm_ext_t btnm;     /*Ext. of ancestor*/
+    /*New data for this type */
+    lv_obj_t * ta;
+    lv_kb_mode_t mode;
+    uint8_t cur_mng    :1;
+    lv_action_t     ok_action;
+    lv_action_t     close_action;
+}lv_kb_ext_t;
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Create a keyboard objects
+ * @param par pointer to an object, it will be the parent of the new keyboard
+ * @param copy pointer to a keyboard object, if not NULL then the new object will be copied from it
+ * @return pointer to the created keyboard
+ */
+lv_obj_t * lv_kb_create(lv_obj_t * par, lv_obj_t * copy);
+
+/**
+ * Signal function of the keyboard
+ * @param kb pointer to a keyboard object
+ * @param sign a signal type from lv_signal_t enum
+ * @param param pointer to a signal specific variable
+ * @return true: the object is still valid (not deleted), false: the object become invalid
+ */
+bool lv_kb_signal(lv_obj_t * kb, lv_signal_t sign, void * param);
+
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif  /*USE_LV_KB*/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif  /*LV_KB_H*/