mirror of
https://github.com/suchmememanyskill/TegraExplorer.git
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197 lines
6.6 KiB
C
197 lines
6.6 KiB
C
/**
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* @file lv_text.h
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*
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*/
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#ifndef LV_TXT_H
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#define LV_TXT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*********************
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* INCLUDES
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*********************/
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#ifdef LV_CONF_INCLUDE_SIMPLE
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#include "lv_conf.h"
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#else
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#include "../../lv_conf.h"
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#endif
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#include "lv_area.h"
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#include "lv_font.h"
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#include "lv_area.h"
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/*********************
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* DEFINES
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*********************/
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#define LV_TXT_COLOR_CMD "#"
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/**********************
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* TYPEDEFS
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**********************/
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enum
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{
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LV_TXT_FLAG_NONE = 0x00,
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LV_TXT_FLAG_RECOLOR = 0x01, /*Enable parsing of recolor command*/
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LV_TXT_FLAG_EXPAND = 0x02, /*Ignore width to avoid automatic word wrapping*/
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LV_TXT_FLAG_CENTER = 0x04, /*Align the text to the middle*/
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LV_TXT_FLAG_RIGHT = 0x08, /*Align the text to the right*/
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};
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typedef uint8_t lv_txt_flag_t;
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enum
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{
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LV_TXT_CMD_STATE_WAIT, /*Waiting for command*/
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LV_TXT_CMD_STATE_PAR, /*Processing the parameter*/
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LV_TXT_CMD_STATE_IN, /*Processing the command*/
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};
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typedef uint8_t lv_txt_cmd_state_t;
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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/**
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* Get size of a text
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* @param size_res pointer to a 'point_t' variable to store the result
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* @param text pointer to a text
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* @param font pinter to font of the text
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* @param letter_space letter space of the text
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* @param line_space line space of the text
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* @param flags settings for the text from 'txt_flag_t' enum
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* @param max_width max with of the text (break the lines to fit this size) Set CORD_MAX to avoid line breaks
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*/
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void lv_txt_get_size(lv_point_t * size_res, const char * text, const lv_font_t * font,
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lv_coord_t letter_space, lv_coord_t line_space, lv_coord_t max_width, lv_txt_flag_t flag);
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/**
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* Get the next line of text. Check line length and break chars too.
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* @param txt a '\0' terminated string
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* @param font pointer to a font
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* @param letter_space letter space
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* @param max_width max with of the text (break the lines to fit this size) Set CORD_MAX to avoid line breaks
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* @param flags settings for the text from 'txt_flag_type' enum
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* @return the index of the first char of the new line (in byte index not letter index. With UTF-8 they are different)
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*/
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uint16_t lv_txt_get_next_line(const char * txt, const lv_font_t * font,
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lv_coord_t letter_space, lv_coord_t max_width, lv_txt_flag_t flag);
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/**
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* Give the length of a text with a given font
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* @param txt a '\0' terminate string
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* @param length length of 'txt' in byte count and not characters (Á is 1 character but 2 bytes in UTF-8)
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* @param font pointer to a font
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* @param letter_space letter space
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* @param flags settings for the text from 'txt_flag_t' enum
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* @return length of a char_num long text
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*/
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lv_coord_t lv_txt_get_width(const char * txt, uint16_t length,
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const lv_font_t * font, lv_coord_t letter_space, lv_txt_flag_t flag);
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/**
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* Check next character in a string and decide if te character is part of the command or not
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* @param state pointer to a txt_cmd_state_t variable which stores the current state of command processing
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* @param c the current character
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* @return true: the character is part of a command and should not be written,
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* false: the character should be written
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*/
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bool lv_txt_is_cmd(lv_txt_cmd_state_t * state, uint32_t c);
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/**
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* Insert a string into an other
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* @param txt_buf the original text (must be big enough for the result text)
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* @param pos position to insert (0: before the original text, 1: after the first char etc.)
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* @param ins_txt text to insert
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*/
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void lv_txt_ins(char * txt_buf, uint32_t pos, const char * ins_txt);
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/**
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* Delete a part of a string
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* @param txt string to modify
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* @param pos position where to start the deleting (0: before the first char, 1: after the first char etc.)
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* @param len number of characters to delete
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*/
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void lv_txt_cut(char * txt, uint32_t pos, uint32_t len);
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/***************************************************************
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* GLOBAL FUNCTION POINTERS FOR CAHRACTER ENCODING INTERFACE
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***************************************************************/
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/**
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* Give the size of an encoded character
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* @param str pointer to a character in a string
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* @return length of the encoded character (1,2,3 ...). O in invalid
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*/
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extern uint8_t (*lv_txt_encoded_size)(const char *);
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/**
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* Convert an Unicode letter to encoded
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* @param letter_uni an Unicode letter
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* @return Encoded character in Little Endian to be compatible with C chars (e.g. 'Á', 'Ü')
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*/
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extern uint32_t (*lv_txt_unicode_to_encoded)(uint32_t );
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/**
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* Convert a wide character, e.g. 'Á' little endian to be compatible with the encoded format.
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* @param c a wide character
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* @return `c` in the encoded format
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*/
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extern uint32_t (*lv_txt_encoded_conv_wc) (uint32_t c);
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/**
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* Decode the next encoded character from a string.
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* @param txt pointer to '\0' terminated string
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* @param i start index in 'txt' where to start.
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* After the call it will point to the next encoded char in 'txt'.
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* NULL to use txt[0] as index
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* @return the decoded Unicode character or 0 on invalid data code
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*/
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extern uint32_t (*lv_txt_encoded_next)(const char *, uint32_t * );
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/**
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* Get the previous encoded character form a string.
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* @param txt pointer to '\0' terminated string
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* @param i_start index in 'txt' where to start. After the call it will point to the previous encoded char in 'txt'.
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* @return the decoded Unicode character or 0 on invalid data
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*/
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extern uint32_t (*lv_txt_encoded_prev)(const char *, uint32_t *);
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/**
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* Convert a letter index (in an the encoded text) to byte index.
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* E.g. in UTF-8 "AÁRT" index of 'R' is 2 but start at byte 3 because 'Á' is 2 bytes long
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* @param txt a '\0' terminated UTF-8 string
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* @param enc_id letter index
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* @return byte index of the 'enc_id'th letter
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*/
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extern uint32_t (*lv_txt_encoded_get_byte_id)(const char *, uint32_t);
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/**
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* Convert a byte index (in an encoded text) to character index.
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* E.g. in UTF-8 "AÁRT" index of 'R' is 2 but start at byte 3 because 'Á' is 2 bytes long
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* @param txt a '\0' terminated UTF-8 string
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* @param byte_id byte index
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* @return character index of the letter at 'byte_id'th position
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*/
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extern uint32_t (*lv_encoded_get_char_id)(const char *, uint32_t);
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/**
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* Get the number of characters (and NOT bytes) in a string.
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* E.g. in UTF-8 "ÁBC" is 3 characters (but 4 bytes)
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* @param txt a '\0' terminated char string
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* @return number of characters
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*/
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extern uint32_t (*lv_txt_get_encoded_length)(const char *);
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/**********************
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* MACROS
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**********************/
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /*USE_TXT*/
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